DDR4 SDRAM SODIMM
MTA4ATF51264HZ – 4GB
Features
• DDR4 functionality and operations supported as
defined in the component data sheet
• 260-pin, small-outline dual in-line memory module
(SODIMM)
• Fast data transfer rates: PC4-2666, PC4-2400, and
PC4-2133
• 4GB (512 Meg x 64)
• VDD = 1.20V (NOM)
• VPP = 2.5V (NOM)
• VDDSPD = 2.5V (NOM)
• Nominal and dynamic on-die termination (ODT) for
data, strobe, and mask signals
• Low-power auto self refresh (LPASR)
• Data bus inversion (DBI) for data bus
• On-die VREFDQ generation and calibration
• Single-rank
• On-board I2C serial presence-detect (SPD) EEPROM
• 8 internal banks; 2 groups of 4 banks each
• Fixed burst chop (BC) of 4 and burst length (BL) of 8
via the mode register set (MRS)
• Selectable BC4 or BL8 on-the-fly (OTF)
• Gold edge contacts
• Halogen-free
• Fly-by topology
• Terminated control command and address bus
Figure 1: 260-Pin SODIMM (MO-310 R/C C)
Module Height: 30mm (1.181 in)
Options Marking
• Operating temperature
– Commercial (0°C ≤ TOPER ≤ 95°C) None
• Package
– 260-pin DIMM (halogen-free) Z
• Frequency/CAS latency
– 0.75ns @ CL = 19 (DDR4-2666) -2G6
– 0.83ns @ CL = 17 (DDR4-2400) -2G3
– 0.93ns @ CL = 15 (DDR4-2133) -2G1
Table 1: Key Timing Parameters
Speed
Grade
Industry
Nomen-
clature
Data Rate (MT/s)
tRCD
(ns)
tRP
(ns)
tRC
(ns)
CL =
20,
CL =
19
CL =
18
CL =
17
CL =
16
CL =
15
CL =
14
CL =
13
CL =
12
CL =
11
CL =
10 CL = 9
-2G6 PC4-2666 2666 2666 2400 2133 2133 1866 1866 1600 1600 1333 – 14.16 14.16 46.16
-2G4 PC4-2400 – 2400 2400 2400 2133 1866 1866 1600 1600 – 1333 13.32 13.32 45.32
-2G3 PC4-2400 – 2400 2400 2133 2133 1866 1866 1600 1600 1333 – 14.16 14.16 46.16
-2G1 PC4-2133 – – – 2133 2133 1866 1866 1600 1600 – 1333 13.5 13.5 46.5
4GB (x64, SR) 260-Pin DDR4 SODIMM
Features
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 1Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
Products and specifications discussed herein are subject to change by Micron without notice.
Table 2: Addressing
Parameter 4GB
Row address 64K A[15:0]
Column address 1K A[9:0]
Device bank group address 2 BG0
Device bank address per group 4 BA[1:0]
Device configuration 8Gb (512 Meg x 16), 8 banks
Module rank address CS0_n
Table 3: Part Numbers and Timing Parameters – 4GB Modules
Base device: MT40A512M16,1 8Gb DDR4 SDRAM
Part Number2
Module
Density Configuration
Module
Bandwidth
Memory Clock/
Data Rate
Clock Cycles
(CL-tRCD-tRP)
MTA4ATF51264HZ-2G6__ 4GB 512 Meg x 64 21.3 GB/s 0.75ns/2666 MT/s 19-19-19
MTA4ATF51264HZ-2G3__ 4GB 512 Meg x 64 19.2 GB/s 0.83ns/2400 MT/s 17-17-17
MTA4ATF51264HZ-2G1__ 4GB 512 Meg x 64 17.0 GB/s 0.93ns/2133 MT/s 15-15-15
Notes: 1. The data sheet for the base device can be found on micron.com.
2. All part numbers end with a two-place code (not shown) that designates component and PCB revisions.
Consult factory for current revision codes. Example: MTA4ATF51264HZ-2G3B1.
4GB (x64, SR) 260-Pin DDR4 SODIMM
Features
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 2Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
Pin Assignments
The pin assignment table below is a comprehensive list of all possible pin assignments
for DDR4 SODIMM modules. See Functional Block Diagram for pins specific to this
module.
Table 4: Pin Assignments
260-Pin DDR4 SODIMM Front 260-Pin DDR4 SODIMM Back
Pin Symbol Pin Symbol Pin Symbol Pin Symbol Pin Symbol Pin Symbol Pin Symbol Pin Symbol
1 VSS 67 DQ29 133 A1 199 DM5_n/
DBI5_n
2 VSS 68 VSS 134 EVENT_n,
NF
200 DQS5_t
3 DQ5 69 VSS 135 VDD 201 VSS 4 DQ4 70 DQ24 136 VDD 202 VSS
5 VSS 71 DQ25 137 CK0_t 203 DQ46 6 VSS 72 VSS 138 CK1_t/NF 204 DQ47
7 DQ1 73 VSS 139 CK0_c 205 VSS 8 DQ0 74 DQS3_c 140 CK1_c/NF 206 VSS
9 VSS 75 DM3_n/
DBI3_n
141 VDD 207 DQ42 10 VSS 76 DQS3_t 142 VDD 208 DQ43
11 DQS0_c 77 VSS 143 PARITY 209 VSS 12 DM0_n/
DBI0_n
78 VSS 144 A0 210 VSS
13 DQS0_t 79 DQ30 145 BA1 211 DQ52 14 VSS 80 DQ31 146 A10/AP 212 DQ53
15 VSS 81 VSS 147 VDD 213 VSS 16 DQ6 82 VSS 148 VDD 214 VSS
17 DQ7 83 DQ26 149 CS0_n 215 DQ49 18 VSS 84 DQ27 150 BA0 216 DQ48
19 VSS 85 VSS 151 WE_n/
A14
217 VSS 20 DQ2 86 VSS 152 RAS_n/
A16
218 VSS
21 DQ3 87 CB5/NC 153 VDD 219 DQS6_c 22 VSS 88 CB4/NC 154 VDD 220 DM6_n/
DBI6_n
23 VSS 89 VSS 155 ODT0 221 DQS6_t 24 DQ12 90 VSS 156 CAS_n/
A15
222 VSS
25 DQ13 91 CB1/NC 157 CS1_n/
NC
223 VSS 26 VSS 92 CB0/NC 158 A13 224 DQ54
27 VSS 93 VSS 159 VDD 225 DQ55 28 DQ8 94 VSS 160 VDD 226 VSS
29 DQ9 95 DQS8_c 161 ODT1/
NC
227 VSS
30 VSS 96 DM8_n/
DBI_n/NC
162 C0/
CS2_n/NC
228 DQ50
31 VSS 97 DQS8_t 163 VDD 229 DQ51 32 DQS1_c 98 VSS 164 VREFCA 230 VSS
33 DM1_n/
DBI_n
99 VSS 165 C1, CS3_n,
NC
231 VSS 34 DQS1_t 100 CB6/NC 166 SA2 232 DQ60
35 VSS 101 CB2/NC 167 VSS 233 DQ61 36 VSS 102 VSS 168 VSS 234 VSS
37 DQ15 103 VSS 169 DQ37 235 VSS 38 DQ14 104 CB7/NC 170 DQ36 236 DQ57
39 VSS 105 CB3/NC 171 VSS 237 DQ56 40 VSS 106 VSS 172 VSS 238 VSS
41 DQ10 107 VSS 173 DQ33 239 VSS 42 DQ11 108 RESET_n 174 DQ32 240 DQS7_c
43 VSS 109 CKE0 175 VSS 241 DM7_n/
DBI7_n
44 VSS 110 CKE1/
NC
176 VSS 242 DQS7_t
45 DQ21 111 VDD 177 DQS4_c 243 VSS 46 DQ20 112 VDD 178 DM4_n/
DBI4_n
244 VSS
47 VSS 113 BG1 179 DQS4_t 245 DQ62 48 VSS 114 ACT_n 180 VSS 246 DQ63
49 DQ17 115 BG0 181 VSS 247 VSS 50 DQ16 116 ALERT_n 182 DQ39 248 VSS
51 VSS 117 VDD 183 DQ38 249 DQ58 52 VSS 118 VDD 184 VSS 250 DQ59
53 DQS2_c 119 A12 185 VSS 251 VSS 54 DM2_n/
DBI2_n
120 A11 186 DQ35 252 VSS
55 DQS2_t 121 A9 187 DQ34 253 SCL 56 VSS 122 A7 188 VSS 254 SDA
57 VSS 123 VDD 189 VSS 255 VDDSPD 58 DQ22 124 VDD 190 DQ45 256 SA0
4GB (x64, SR) 260-Pin DDR4 SODIMM
Pin Assignments
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 3Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
Table 4: Pin Assignments (Continued)
260-Pin DDR4 SODIMM Front 260-Pin DDR4 SODIMM Back
Pin Symbol Pin Symbol Pin Symbol Pin Symbol Pin Symbol Pin Symbol Pin Symbol Pin Symbol
59 DQ23 125 A8 191 DQ44 257 VPP 60 VSS 126 A5 192 VSS 258 VTT
61 VSS 127 A6 193 VSS 259 VPP 62 DQ18 128 A4 194 DQ41 260 SA1
63 DQ19 129 VDD 195 DQ40 – – 64 VSS 130 VDD 196 VSS – –
65 VSS 131 A3 197 VSS – – 66 DQ28 132 A2 198 DQS5_c – –
4GB (x64, SR) 260-Pin DDR4 SODIMM
Pin Assignments
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 4Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
Pin Descriptions
The pin description table below is a comprehensive list of all possible pins for DDR4
modules. All pins listed may not be supported on this module. See Functional Block Di-
agram for pins specific to this module.
Table 5: Pin Descriptions
Symbol Type Description
Ax Input Address inputs: Provide the row address for ACTIVATE commands and the column address for
READ/WRITE commands in order to select one location out of the memory array in the respec-
tive bank (A10/AP, A12/BC_n, WE_n/A14, CAS_n/A15, and RAS_n/A16 have additional functions;
see individual entries in this table). The address inputs also provide the op-code during the
MODE REGISTER SET command. A17 is only defined for x4 SDRAM.
A10/AP Input Auto precharge: A10 is sampled during READ and WRITE commands to determine whether an
auto precharge should be performed on the accessed bank after a READ or WRITE operation
(HIGH = auto precharge; LOW = no auto precharge). A10 is sampled during a PRECHARGE com-
mand to determine whether the precharge applies to one bank (A10 LOW) or all banks (A10
HIGH). If only one bank is to be precharged, the bank is selected by the bank group and bank
addresses.
A12/BC_n Input Burst chop: A12/BC_n is sampled during READ and WRITE commands to determine if burst
chop (on-the-fly) will be performed (HIGH = no burst chop; LOW = burst- chopped). See Com-
mand Truth Table in the DDR4 component data sheet.
ACT_n Input Command input: ACT_n defines the ACTIVATE command being entered along with CS_n. The
input into RAS_n/A16, CAS_n/A15, and WE_n/A14 are considered as row address A16, A15, and
A14. See Command Truth Table.
BAx Input Bank address inputs: Define the bank (with a bank group) to which an ACTIVATE, READ,
WRITE, or PRECHARGE command is being applied. Also determine which mode register is to be
accessed during a MODE REGISTER SET command.
BGx Input Bank group address inputs: Define the bank group to which a REFRESH, ACTIVATE, READ,
WRITE, or PRECHARGE command is being applied. Also determine which mode register is to be
accessed during a MODE REGISTER SET command. BG[1:0] are used in the x4 and x8 configura-
tions. x16-based SDRAM only has BG0.
C0, C1, C2
(RDIMM/LRDIMM on-
ly)
Input Chip ID: These inputs are used only when devices are stacked; that is, 2H, 4H, and 8H stacks for
x4 and x8 configurations using through-silicon vias (TSVs). These pins are not used in the x16
configuration. Some DDR4 modules support a traditional DDP package, which uses CS1_n,
CKE1, and ODT1 to control the second die. All other stack configurations, such as a 4H or 8H,
are assumed to be single-load (master/slave) type configurations where C0, C1, and C2 are used
as chip ID selects in conjunction with a single CS_n, CKE, and ODT. Chip ID is considered part of
the command code.
CKx_t
CKx_c
Input Clock: Differential clock inputs. All address, command, and control input signals are sampled
on the crossing of the positive edge of CK_t and the negative edge of CK_c.
CKEx Input Clock enable: CKE HIGH activates and CKE LOW deactivates the internal clock signals, device
input buffers, and output drivers. Taking CKE LOW provides PRECHARGE POWER-DOWN and
SELF REFRESH operations (all banks idle), or active power-down (row active in any bank). CKE is
asynchronous for self refresh exit. After VREFCA has become stable during the power-on and ini-
tialization sequence, it must be maintained during all operations (including SELF REFRESH). CKE
must be maintained HIGH throughout read and write accesses. Input buffers (excluding CK_t,
CK_c, ODT, RESET_n, and CKE) are disabled during power-down. Input buffers (excluding CKE
and RESET#) are disabled during self refresh.
CSx_n Input Chip select: All commands are masked when CS_n is registered HIGH. CS_n provides external
rank selection on systems with multiple ranks. CS_n is considered part of the command code
(CS2_n and CS3_n are not used on UDIMMs).
4GB (x64, SR) 260-Pin DDR4 SODIMM
Pin Descriptions
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 5Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
Table 5: Pin Descriptions (Continued)
Symbol Type Description
ODTx Input On-die termination: ODT (registered HIGH) enables termination resistance internal to the
DDR4 SDRAM. When enabled, ODT (RTT) is applied only to each DQ, DQS_t, DQS_c, DM_n/
DBI_n/TDQS_t, and TDQS_c signal for x4 and x8 configurations (when the TDQS function is ena-
bled via the mode register). For the x16 configuration, RTT is applied to each DQ, DQSU_t,
DQSU_c, DQSL_t, DQSL_c, UDM_n, and LDM_n signal. The ODT pin will be ignored if the mode
registers are programmed to disable RTT.
PARITY Input Parity for command and address: This function can be enabled or disabled via the mode
register. When enabled in MR5, the DRAM calculates parity with ACT_n, RAS_n/A16, CAS_n/A15,
WE_n/A14, BG[1:0], BA[1:0], A[16:0]. Input parity should be maintained at the rising edge of the
clock and at the same time as command and address with CS_n LOW.
RAS_n/A16
CAS_n/A15
WE_n/A14
Input Command inputs: RAS_n/A16, CAS_n/A15, and WE_n/A14 (along with CS_n) define the com-
mand and/or address being entered and have multiple functions. For example, for activation
with ACT_n LOW, these are addresses like A16, A15, and A14, but for a non-activation com-
mand with ACT_n HIGH, these are command pins for READ, WRITE, and other commands de-
fined in Command Truth Table.
RESET_n CMOS Input Active LOW asynchronous reset: Reset is active when RESET_n is LOW and inactive when RE-
SET_n is HIGH. RESET_n must be HIGH during normal operation.
SAx Input Serial address inputs: Used to configure the temperature sensor/SPD EEPROM address range
on the I2C bus.
SCL Input Serial clock for temperature sensor/SPD EEPROM: Used to synchronize communication to
and from the temperature sensor/SPD EEPROM on the I2C bus.
DQx, CBx I/O Data input/output and check bit input/output: Bidirectional data bus. DQ represents
DQ[3:0], DQ[7:0], and DQ[15:0] for the x4, x8, and x16 configurations, respectively. If cyclic re-
dundancy checksum (CRC) is enabled via the mode register, the CRC code is added at the end of
the data burst. Any one or all of DQ0, DQ1, DQ2, or DQ3 may be used for monitoring of inter-
nal VREF level during test via mode register setting MR[4] A[4] = HIGH; training times change
when enabled.
DM_n/DBI_n/
TDQS_t (DMU_n,
DBIU_n), (DML_n/
DBIl_n)
I/O Input data mask and data bus inversion: DM_n is an input mask signal for write data. Input
data is masked when DM_n is sampled LOW coincident with that input data during a write ac-
cess. DM_n is sampled on both edges of DQS. DM is multiplexed with the DBI function by the
mode register A10, A11, and A12 settings in MR5. For a x8 device, the function of DM or TDQS
is enabled by the mode register A11 setting in MR1. DBI_n is an input/output identifying
whether to store/output the true or inverted data. If DBI_n is LOW, the data will be stored/
output after inversion inside the DDR4 device and not inverted if DBI_n is HIGH. TDQS is only
supported in x8 SDRAM configurations (TDQS is not valid for UDIMMs).
SDA I/O Serial Data: Bidirectional signal used to transfer data in or out of the EEPROM or EEPROM/TS
combo device.
DQS_t
DQS_c
DQSU_t
DQSU_c
DQSL_t
DQSL_c
I/O Data strobe: Output with read data, input with write data. Edge-aligned with read data, cen-
tered-aligned with write data. For x16 configurations, DQSL corresponds to the data on
DQ[7:0], and DQSU corresponds to the data on DQ[15:8]. For the x4 and x8 configurations, DQS
corresponds to the data on DQ[3:0] and DQ[7:0], respectively. DDR4 SDRAM supports a differen-
tial data strobe only and does not support a single-ended data strobe.
ALERT_n Output Alert output: Possesses functions such as CRC error flag and command and address parity error
flag as output signal. If a CRC error occurs, ALERT_n goes LOW for the period time interval and
returns HIGH. If an error occurs during a command address parity check, ALERT_n goes LOW un-
til the on-going DRAM internal recovery transaction is complete. During connectivity test mode,
this pin functions as an input. Use of this signal is system-dependent. If not connected as signal,
ALERT_n pin must be connected to VDD on DIMMs.
EVENT_n Output Temperature event: The EVENT_n pin is asserted by the temperature sensor when critical tem-
perature thresholds have been exceeded. This pin has no function (NF) on modules without
temperature sensors.
4GB (x64, SR) 260-Pin DDR4 SODIMM
Pin Descriptions
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 6Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
Table 5: Pin Descriptions (Continued)
Symbol Type Description
TDQS_t
TDQS_c
(x8 DRAM-based
RDIMM only)
Output Termination data strobe: When enabled via the mode register, the DRAM device enables the
same RTT termination resistance on TDQS_t and TDQS_c that is applied to DQS_t and DQS_c.
When the TDQS function is disabled via the mode register, the DM/TDQS_t pin provides the da-
ta mask (DM) function, and the TDQS_c pin is not used. The TDQS function must be disabled in
the mode register for both the x4 and x16 configurations. The DM function is supported only in
x8 and x16 configurations. DM, DBI, and TDQS are a shared pin and are enabled/disabled by
mode register settings. For more information about TDQS, see the DDR4 DRAM component da-
ta sheet (TDQS_t and TDQS_c are not valid for UDIMMs).
VDD Supply Module power supply: 1.2V (TYP).
VPP Supply DRAM activating power supply: 2.5V –0.125V / +0.250V.
VREFCA Supply Reference voltage for control, command, and address pins.
VSS Supply Ground.
VTT Supply Power supply for termination of address, command, and control VDD/2.
VDDSPD Supply Power supply used to power the I2C bus for SPD.
RFU – Reserved for future use.
NC – No connect: No internal electrical connection is present.
NF – No function: May have internal connection present, but has no function.
4GB (x64, SR) 260-Pin DDR4 SODIMM
Pin Descriptions
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 7Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
DQ Map
Table 6: Component-to-Module DQ Map
Component
Reference
Number
Component
DQ Module DQ
Module Pin
Number
Component
Reference
Number
Component
DQ Module DQ
Module Pin
Number
U1 00 3 21 U2 00 19 63
01 1 7 01 17 49
02 2 20 02 18 62
03 0 8 03 16 50
04 7 17 04 23 59
05 5 3 05 21 45
06 6 16 06 22 58
07 4 4 07 20 46
08 10 41 08 26 83
09 8 28 09 24 70
10 11 42 10 27 84
11 9 29 11 25 71
12 14 38 12 30 79
13 13 25 13 29 67
14 15 37 14 31 80
15 12 24 15 28 66
U4 00 35 186 U5 00 51 229
01 33 173 01 49 215
02 34 187 02 50 228
03 32 174 03 48 216
04 39 182 04 55 225
05 37 169 05 53 212
06 38 183 06 54 224
07 36 170 07 52 211
08 42 207 08 58 249
09 40 195 09 56 237
10 43 208 10 59 250
11 41 194 11 57 236
12 46 203 12 62 245
13 45 190 13 61 233
14 47 204 14 63 246
15 44 191 15 60 232
4GB (x64, SR) 260-Pin DDR4 SODIMM
DQ Map
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 8Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
Functional Block Diagram
Figure 2: Functional Block Diagram
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
DQ8
DQ9
DQ10
DQ11
DQ12
DQ13
DQ14
DQ15
DQ32
DQ33
DQ34
DQ35
DQ36
DQ37
DQ38
DQ39
DQ40
DQ41
DQ42
DQ43
DQ44
DQ45
DQ46
DQ47
DQ16
DQ17
DQ18
DQ19
DQ20
DQ21
DQ22
DQ23
DQ24
DQ25
DQ26
DQ27
DQ28
DQ29
DQ30
DQ31
DQ48
DQ49
DQ50
DQ51
DQ52
DQ53
DQ54
DQ55
DQ56
DQ57
DQ58
DQ59
DQ60
DQ61
DQ62
DQ63
CS_n CS_n
U1
U2
U4
U5
VSS
VSS VSS
VSS
CS0_n
DQS0_t
DQS0_c
DM0_n/DBI0_n
DQS_t
DQS_c
DM_n/DBI_n
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQS_t
DQS_c
DM_n/DBI_n
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQ
ZQ
DQS_t
DQS_c
DM_n/DBI_n
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQS_t
DQS_c
DM_n/DBI_n
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQ
ZQ
DQS_t
DQS_c
DM_n/DBI_n
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQS_t
DQS_c
DM_n/DBI_n
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQ
ZQ
DQS_t
DQS_c
DM_n/DBI_n
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQS_t
DQS_c
DM_n/DBI_n
DQ
DQ
DQ
DQ
DQ
DQ
DQ
DQ
ZQ
CS_n CS_n
DQS1_t
DQS1_c
DM1_n/DBI1_n
DQS2_t
DQS2_c
DM2_n/DBI2_n
DQS3_t
DQS3_c
DM3_n/DBI3_n
DQS4_t
DQS4_c
DM4_n/DBI4_n
DQS6_t
DQS6_c
DM6_n/DBI6_n
DQS7_t
DQS7_c
DM7_n/DBI7_n
DQS5_t
DQS5_c
DM5_n/DBI5_n
Rank 0
CK0_t
CK0_c
Vref CA
Vss
DDR4 SDRAM
DDR4 SDRAM
Vdd
Vddspd SPD EEPROM
Vtt
DDR4 SDRAM
DDR4 SDRAM
Vpp
Clock, control, command, and address line terminations:
A0
SPD EEPROM
A1 A2
SA0
SDA
SCL
EVT
U3
Control, command, and
address termination
DDR4
SDRAM
VTT
CK0_t
CK0_c
DDR4
SDRAM
VDD
BA[1:0]
BG[1:0]
ACT_n
A[13:0]
RAS_n/A16
CAS_n/A15
WE_n/A14
CKE0
ODT0
RESET
PAR_IN
ALERT_CONN
BA[1:0]: DDR4 SDRAM
BG[1:0]: DDR4 SDRAM
ACT_n: DDR4 SDRAM
A[13:0]: DDR4 SDRAM
RAS_n/A16: DDR4 SDRAM
CAS_n/A15: DDR4 SDRAM
WE_n/A14: DDR4 SDRAM
CKE0: Rank 0
ODT0: Rank 0
RESET_n: DDR4 SDRAM
PAR: DDR4 SDRAM
ALERT_DRAM: DDR4 SDRAM
CS0_n, BA[1:0], BG[1:0],
ACT_n, A[13:0], RAS_n/A16,
CAS_n/A15, WE_n/A14,
CKE0, ODT0
Vss Vss
SA1
CK1_t
CK1_c
Note: 1. The ZQ ball on each DDR4 component is connected to an external 240Ω ±1% resistor
that is tied to ground. It is used for the calibration of the component’s ODT and output
driver.
4GB (x64, SR) 260-Pin DDR4 SODIMM
Functional Block Diagram
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 9Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
General Description
High-speed DDR4 SDRAM modules use DDR4 SDRAM devices with two or four internal
memory bank groups. DDR4 SDRAM modules utilizing 4- and 8-bit-wide DDR4 SDRAM
devices have four internal bank groups consisting of four memory banks each, provid-
ing a total of 16 banks. 16-bit-wide DDR4 SDRAM devices have two internal bank
groups consisting of four memory banks each, providing a total of eight banks. DDR4
SDRAM modules benefit from DDR4 SDRAM's use of an 8n-prefetch architecture with
an interface designed to transfer two data words per clock cycle at the I/O pins. A single
READ or WRITE operation for the DDR4 SDRAM effectively consists of a single 8n-bit-
wide, four-clock data transfer at the internal DRAM core and eight corresponding n-bit-
wide, one-half-clock-cycle data transfers at the I/O pins.
DDR4 modules use two sets of differential signals: DQS_t and DQS_c to capture data
and CK_t and CK_c to capture commands, addresses, and control signals. Differential
clocks and data strobes ensure exceptional noise immunity for these signals and pro-
vide precise crossing points to capture input signals.
Fly-By Topology
DDR4 modules use faster clock speeds than earlier DDR technologies, making signal
quality more important than ever. For improved signal quality, the clock, control, com-
mand, and address buses have been routed in a fly-by topology, where each clock, con-
trol, command, and address pin on each DRAM is connected to a single trace and ter-
minated (rather than a tree structure, where the termination is off the module near the
connector). Inherent to fly-by topology, the timing skew between the clock and DQS sig-
nals can be easily accounted for by using the write-leveling feature of DDR4.
Module Manufacturing Location
Micron Technology manufactures modules at sites world-wide. Customers may receive
modules from any of the following manufacturing locations:
Table 7: DRAM Module Manufacturing Locations
Manufacturing Site Location Country of Origin Specified on Label
Boise, USA USA
Aguadilla, Puerto Rico Puerto Rico
Xian, China China
Singapore Singapore
4GB (x64, SR) 260-Pin DDR4 SODIMM
General Description
X26P4QTWDSPK-13-10265
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Address Mapping to DRAM
Address Mirroring
To achieve optimum routing of the address bus on DDR4 multi rank modules, the ad-
dress bus will be wired as shown in the table below, or mirrored. For quad rank mod-
ules, ranks 1 and 3 are mirrored and ranks 0 and 2 are non-mirrored. Highlighted ad-
dress pins have no secondary functions allowing for normal operation when cross-
wired. Data is still read from the same address it was written. However, Load Mode op-
erations require a specific address. This requires the controller to accommodate for a
rank that is "mirrored." Systems may reference DDR4 SPD to determine if the module
has mirroring implemented or not. See the JEDEC DDR4 SPD specification for more de-
tails.
Table 8: Address Mirroring
Edge Connector Pin DRAM Pin, Non-mirrored DRAM Pin, Mirrored
A0 A0 A0
A1 A1 A1
A2 A2 A2
A3 A3 A4
A4 A4 A3
A5 A5 A6
A6 A6 A5
A7 A7 A8
A8 A8 A7
A9 A9 A9
A10 A10 A10
A11 A11 A13
A13 A13 A11
A12 A12 A12
A14 A14 A14
A15 A15 A15
A16 A16 A16
A17 A17 A17
BA0 BA0 BA1
BA1 BA1 BA0
BG0 BG0 BG1
BG1 BG1 BG0
4GB (x64, SR) 260-Pin DDR4 SODIMM
Address Mapping to DRAM
X26P4QTWDSPK-13-10265
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SPD EEPROM Operation
DDR4 SDRAM modules incorporate serial presence detect (SPD). The SPD data is stor-
ed in a 512-byte JEDEC JC-42.4-compliant EEPROM that is segregated into four 128-
byte, write-protectable blocks. The SPD content is aligned with these blocks as shown in
the table below.
Block Range Description
0 0–127 000h–07Fh Configuration and DRAM parameters
1 128–255 080h–0FFh Module-specific parameters
2 256–319 100h–13Fh Reserved; all bytes coded as 00h
320–383 140h–17Fh Manufacturing information
3 384–511 180h–1FFh End-user programmable
The first 384 bytes are programmed by Micron to comply with JEDEC standard JC-45,
"Appendix X: Serial Presence Detect (SPD) for DDR4 SDRAM Modules." The remaining
128 bytes of storage are available for use by the customer.
The EEPROM resides on a two-wire I2C serial interface and is not integrated with the
memory bus in any way. It operates as a slave device in the I2C bus protocol, with all
operations synchronized by the serial clock. Transfer rates of up to 1 MHz are achieva-
ble at 2.5V (NOM).
Micron implements reversible software write protection on DDR4 SDRAM-based mod-
ules. This prevents the lower 384 bytes (bytes 0–383) from being inadvertently program-
med or corrupted. The upper 128 bytes remain available for customer use and unpro-
tected.
4GB (x64, SR) 260-Pin DDR4 SODIMM
SPD EEPROM Operation
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 12 Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
Electrical Specifications
Stresses greater than those listed may cause permanent damage to the module. This is a
stress rating only, and functional operation of the module at these or any other condi-
tions outside those indicated in each device's data sheet is not implied. Exposure to ab-
solute maximum rating conditions for extended periods may adversely affect reliability.
Table 9: Absolute Maximum Ratings
Symbol Parameter Min Max Units Notes
VDD VDD supply voltage relative to VSS –0.4 1.5 V 1
VDDQ VDDQ supply voltage relative to VSS –0.4 1.5 V 1
VPP Voltage on VPP pin relative to VSS –0.4 3.0 V 2
VIN, VOUT Voltage on any pin relative to VSS –0.4 1.5 V
Table 10: Operating Conditions
Symbol Parameter Min Nom Max Units Notes
VDD VDD supply voltage 1.14 1.2 1.26 V 1
VPP DRAM activating power supply 2.375 2.5 2.75 V 2
VREFCA(DC) Input reference voltage command/
address bus
0.49 × VDD 0.5 × VDD 0.51 × VDD V 3
IVTT Termination reference current from VTT –500 – 500 mA
VTT Termination reference voltage (DC) –
command/address bus
0.49 × VDD -
20mV
0.5 × VDD 0.51 × VDD +
20mV
V 4
IIN Input leakage current; any input excluding ZQ;
0V < VIN < 1.1V
–2.0 – 2.0 µA 5
II/O DQ leakage; 0V < Vin < VDD –4.0 – 4.0 µA 5
IZQ Input leakage current; ZQ –3.0 – 3.0 µA 5, 6
IOZpd Output leakage current; VOUT = VDD; DQ is disabled – – 5.0 µA
IOZpu Output leakage current; VOUT =VSS; DQ and ODT are
disabled; ODT is disabled with ODT input HIGH
– – 5.0 µA
IVREFCA VREFCA leakage; VREFCA = VDD/2 (after DRAM is ini-
tialized)
–2.0 – 2.0 µA 5
Notes: 1. VDDQ tracks with VDD; VDDQ and VDD are tied together.
2. VPP must be greater than or equal to VDD at all times.
3. VREFCA must not be greater than 0.6 x VDD. When VDD is less than 500mV, VREF may be
less than or equal to 300mV.
4. VTT termination voltages in excess of the specification limit adversely affect the voltage
margins of command and address signals and reduce timing margins.
5. Multiply by the number of DRAM die on the module.
6. Tied to ground. Not connected to edge connector.
4GB (x64, SR) 260-Pin DDR4 SODIMM
Electrical Specifications
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 13 Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
Table 11: Thermal Characteristics
Symbol Parameter/Condition Value Units Notes
TCCommercial operating case temperature 0 to 85 °C 1, 2, 3
TC>85 to 95 °C 1, 2, 3, 4
TOPER Normal operating temperature range 0 to 85 °C 5, 7
TOPER Extended temperature operating range (optional) >85 to 95 °C 5, 7
TSTG Non-operating storage temperature –55 to 100 °C 6
RHSTG Non-operating Storage Relative Humidity (non-condensing) 5 to 95 %
NA Change Rate of Storage Temperature 20 °C/hour
Notes: 1. Maximum operating case temperature; TC is measured in the center of the package.
2. A thermal solution must be designed to ensure the DRAM device does not exceed the
maximum TC during operation.
3. Device functionality is not guaranteed if the DRAM device exceeds the maximum TC dur-
ing operation.
4. If TC exceeds 85°C, the DRAM must be refreshed externally at 2X refresh, which is a 3.9µs
interval refresh rate.
5. The refresh rate must double when 85°C < TOPER ≤ 95°C.
6. Storage temperature is defined as the temperature of the top/center of the DRAM and
does not reflect the storage temperatures of shipping trays.
7. For additional information, refer to technical note TN-00-08: "Thermal Applications"
available at micron.com.
4GB (x64, SR) 260-Pin DDR4 SODIMM
Electrical Specifications
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 14 Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
DRAM Operating Conditions
Recommended AC operating conditions are given in the DDR4 component data sheets.
Component specifications are available at micron.com. Module speed grades correlate
with component speed grades, as shown below.
Table 12: Module and Component Speed Grades
DDR4 components may exceed the listed module speed grades; module may not be available in all listed speed grades
Module Speed Grade Component Speed Grade
-2G6 -075
-2G4 -083E
-2G3 -083
-2G1 -093E
-1G9 -107E
Design Considerations
Simulations
Micron memory modules are designed to optimize signal integrity through carefully de-
signed terminations, controlled board impedances, routing topologies, trace length
matching, and decoupling. However, good signal integrity starts at the system level. Mi-
cron encourages designers to simulate the signal characteristics of the system's memo-
ry bus to ensure adequate signal integrity of the entire memory system.
Power
Operating voltages are specified at the edge connector of the module, not at the DRAM.
Designers must account for any system voltage drops at anticipated power levels to en-
sure the required supply voltage is maintained.
4GB (x64, SR) 260-Pin DDR4 SODIMM
DRAM Operating Conditions
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 15 Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
IDD Specifications
Table 13: DDR4 IDD Specifications and Conditions – 4GB (Die Revision B)
Values are for the MT40A512M16 DDR4 SDRAM only and are computed from values specified in the 8Gb (512 Meg x 16)
component data sheet
Parameter Symbol 2666 2400 2133 Units
One bank ACTIVATE-PRECHARGE current IDD0 340 320 300 mA
One bank ACTIVATE-PRECHARGE, Word Line Boost, IPP current IPP0 16 16 16 mA
One bank ACTIVATE-READ-PRECHARGE current IDD1 420 400 380 mA
Precharge standby current IDD2N 140 136 132 mA
Precharge standby ODT current IDD2NT 300 300 268 mA
Precharge power-down current IDD2P 100 100 100 mA
Precharge quiet standby current IDD2Q 120 120 120 mA
Active standby current IDD3N 200 188 176 mA
Active standby IPP current IPP3N 12 12 12 mA
Active power-down current IDD3P 172 164 156 mA
Burst read current IDD4R 1052 972 900 mA
Burst write current IDD4W 976 912 852 mA
Burst refresh current (1x REF) IDD5B 1120 1120 1120 mA
Burst refresh IPP current (1x REF) IPP5B 112 112 112 mA
Self refresh current: Normal temperature range (0°C to 85°C) IDD6N 120 120 120 mA
Self refresh current: Extended temperature range (0°C to 95°C) IDD6E 140 140 140 mA
Self refresh current: Reduced temperature range (0°C to 45°C) IDD6R 80 80 80 mA
Auto self refresh current (25°C) IDD6A 34.4 34.4 34.4 mA
Auto self refresh current (45°C) IDD6A 80 80 80 mA
Auto self refresh current (75°C) IDD6A 120 120 120 mA
Bank interleave read current IDD7 1036 996 956 mA
Bank interleave read IPP current IPP7 60 60 60 mA
Maximum power-down current IDD8 100 100 100 mA
4GB (x64, SR) 260-Pin DDR4 SODIMM
IDD Specifications
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 16 Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
SPD EEPROM Operating Conditions
For the latest SPD data, refer to Micron's SPD page: micron.com/spd.
Table 14: SPD EEPROM DC Operating Conditions
Parameter/Condition Symbol Min Nom Max Units
Supply voltage VDDSPD – 2.5 – V
Input low voltage: logic 0; all inputs VIL –0.5 – VDDSPD ×
0.3
V
Input high voltage: logic 1; all inputs VIH VDDSPD ×
0.7
– VDDSPD +
0.5
V
Output low voltage: 3mA sink current VDDSPD > 2V VOL – – 0.4 V
Input leakage current: (SCL, SDA) VIN = VDDSPD or VSSSPD ILI – – ±5 µA
Output leakage current: VOUT = VDDSPD or VSSSPD, SDA in High-Z ILO – – ±5 µA
Notes: 1. Table is provided as a general reference. Consult JEDEC JC-42.4 EE1004 and TSE2004 de-
vice specifications for complete details.
2. All voltages referenced to VDDSPD.
Table 15: SPD EEPROM AC Operating Conditions
Parameter/Condition Symbol Min Max Units
Clock frequency tSCL 10 1000 kHz
Clock pulse width HIGH time tHIGH 260 – ns
Clock pulse width LOW time tLOW 500 – ns
Detect clock LOW timeout tTIMEOUT 25 35 ms
SDA rise time tR – 120 ns
SDA fall time tF – 120 ns
Data-in setup time tSU:DAT 50 – ns
Data-in hold time tHD:DI 0 – ns
Data out hold time tHD:DAT 0 350 ns
Start condition setup time tSU:STA 260 – ns
Start condition hold time tHD:STA 260 – ns
Stop condition setup time tSU:STO 260 – ns
Time the bus must be free before a new transi-
tion can start
tBUF 500 – ns
Write time tW – 5 ms
Warm power cycle time off tPOFF 1 – ms
Time from power on to first command tINIT 10 – ms
Note: 1. Table is provided as a general reference. Consult JEDEC JC-42.4 EE1004 and TSE2004 de-
vice specifications for complete details.
4GB (x64, SR) 260-Pin DDR4 SODIMM
SPD EEPROM Operating Conditions
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 17 Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
Module Dimensions
Figure 3: 260-Pin DDR4 SODIMM
2.5 (0.1)
MAX
PIN 1
20.0 (0.787)
TYP
1.8 (0.071)
(2X)
0.5 (0.019)
TYP
0.35 (0.014)
TYP
.65 (0.025) R0
(4X)
PIN 259
PIN 260 PIN 2
Front view
2.0 (0.079)
TYP
6.0 (0.236)
TYP
65.6 (2.58)
TYP
2.55 (0.10)
TYP
30.13 (1.186)
29.87 (1.176)
Back view
1.3 (0.051)
1.1 (0.043)
28.5 (1.12)
TYP
35.5 (1.4)
TYP
2.5 (0.98)
TYP
4.0 (0.157)
TYP
38.3 (1.51)
TYP
0.6 (0.24) x 45° (4X)
1.0 (0.039)
TYP
1.75 (0.07)
TYP (2X)
0.25 (0.1) x 45° (2X)
18.0 (0.71)
TYP
4.0 (0.157) TYP (2X)
69.73 (2.745)
69.47 (2.735)
U1 U2 U4 U5
U3
No Components This Side of Module
Notes: 1. All dimensions are in millimeters (inches); MAX/MIN or typical (TYP) where noted.
2. The dimensional diagram is for reference only.
8000 S. Federal Way, P.O. Box 6, Boise, ID 83707-0006, Tel: 208-368-4000
www.micron.com/products/support Sales inquiries: 800-932-4992
Micron and the Micron logo are trademarks of Micron Technology, Inc.
All other trademarks are the property of their respective owners.
This data sheet contains minimum and maximum limits specified over the power supply and temperature range set forth herein.
Although considered final, these specifications are subject to change, as further product development and data characterization some-
times occur.
4GB (x64, SR) 260-Pin DDR4 SODIMM
Module Dimensions
X26P4QTWDSPK-13-10265
atf4c512x64hz.pdf – Rev. C 8/16 EN 18 Micron Technology, Inc. reserves the right to change products or specifications without notice.
© 2016 Micron Technology, Inc. All rights reserved.
