HN27C256HG Series
32768-word ×8-bit CMOS UV Erasable and Programmable ROM
The Hitachi HN27C256HG is a 256-kbit
ultraviolet erasable and electrically programmable
ROM, featuring sub-100-ns access times.
The HN27C256HG realizes access time of 70 ns
and 85 ns, employing the advanced fine process
and high speed circuitry technique.
The timing conditions such as access time or
output hold time are designed as same as our byte-
wide SRAMs’, allowing to use with SRAMs on the
same memory board by the same read timings. So
its board design in 16-bit microprocessor systems
is easy.
Also, the HN27C256HG realizes faster
programming time than our conventional 256-kbit
EPROM by Hitachi’s Fast High-Reliability
Programming Algorithm.
Pin arrangement, pin configuration and
programming voltage are compatible with our 256-
kbit EPROM series, therefore existing
programmers can be used with the HN27C256HG.
Features
• High speed: Access time 70/85 ns (max)
• Low power dissipation
Active mode: 30 mW (typ) (f = 1 MHz)
• High reliability and fast programming
Programming voltage: +12.5 V DC
Fast High-Reliability Programming Algorithm
available
• Device identifier mode
Manufacturer code and device code
Ordering Information
Type No. Access time Package
————————————————————–
HN27C256HG-70 70 ns 600-mil 28-pin
—————————————– cerdip
HN27C256HG-85 85 ns (DG-28)
————————————————————–
Pin Arrangement
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VCC
A14
A13
A8
A9
A11
OE
A10
CE
I/O7
I/O6
I/O5
I/O4
I/O3
VPP
A12
A7
A6
A5
A4
A3
A2
A1
A0
I/O0
I/O1
I/O2
VSS
(Top View)
1
2
HN27C256HG Series HN27C256HG Series
Block Diagram
512 × 512
Memory Matrix
Y-Gating
Y-Decoder
A0 – A3
A10, A11
: High Threshold Inverter
H
X-Decoder
Input Data
Control
A4 – A9
A12 – A14
Address
I/O0
I/O7
CE
OE
VCC
VPP
VSS
H
Pin Description
Pin name Function
————————————————————–
A0 – A14 Address
————————————————————–
I/O0 – I/O7 Input/output
————————————————————–
CE Chip enable
————————————————————–
OE Output enable
————————————————————–
Pin name Function
————————————————————–
VCC Power supply
————————————————————–
VPP Programming power supply
————————————————————–
VSS Ground
————————————————————–
Mode Selection
CE OE A9 VPP VCC I/O
————————————————————————————————————
Mode (20) (22) (24) (1) (28) (11 – 13, 15 – 19)
———————————————————————————————————————————
Read VIL VIL ✕VCC VCC Dout
———————————————————————————————————————————
Output disable VIL VIH ✕VCC VCC High-Z
———————————————————————————————————————————
Standby VIH ✕✕V
CC VCC High-Z
———————————————————————————————————————————
Program VIL VIH ✕VPP VCC Din
———————————————————————————————————————————
Program verify VIH VIL ✕VPP VCC Dout
———————————————————————————————————————————
Optional verify VIL VIL ✕VPP VCC Dout
———————————————————————————————————————————
Program inhibit VIH VIH ✕VPP VCC High-Z
———————————————————————————————————————————
Identifier VIL VIL VH*2 VCC VCC Code
———————————————————————————————————————————
Notes: 1. ✕ : Don’t care.
2. VH: 12.0 V ± 0.5 V.
Absolute Maximum Ratings
Parameter Symbol Value Unit
———————————————————————————————————————————
All input and output voltage*1 Vin, Vout –0.6*2 to +7.0 V
———————————————————————————————————————————
A9 input voltage*1 VID –0.6*2 to +13.5 V
———————————————————————————————————————————
VPP voltage*1 VPP –0.6 to +13.5 V
———————————————————————————————————————————
VCC voltage*1 VCC –0.6 to +7.0 V
———————————————————————————————————————————
Operating temperature range Topr 0 to +70 °C
———————————————————————————————————————————
Storage temperature range Tstg –65 to +125 °C
———————————————————————————————————————————
Storage temperature range under bias Tbias –10 to +80 °C
———————————————————————————————————————————
Notes: 1. Relative to VSS.
2. Vin, Vout, VID min = –1.0 V for pulse width ≤50 ns.
3
HN27C256HG Series HN27C256HG Series
Capacitance (Ta = 25°C, f = 1 MHz)
Parameter Symbol Min Typ Max Unit Test conditions
———————————————————————————————————————————
Input capacitance Cin — 4 8 pF Vin = 0 V
———————————————————————————————————————————
Output capacitance Cout — 8 12 pF Vout = 0 V
———————————————————————————————————————————
Read Operation
DC Characteristics (Ta = 0 to +70°C, VCC = 5 V ± 10%, VPP = VCC)
Parameter Symbol Min Typ Max Unit Test conditions
———————————————————————————————————————————
Input leakage current ILI — — 2 µA Vin = 0 V to VCC
———————————————————————————————————————————
Output leakage current ILO — — 2 µA Vout = 0 V to VCC
———————————————————————————————————————————
VPP current IPP1 — 1 100 µA VPP = 5.5 V
———————————————————————————————————————————
Standby VCC current ISB ——15 mACE = VIH
———————————————————————————————————————————
Operating VCC current ICC1 ——30 mACE = VIL, Iout = 0 mA
————————————————————————————————
ICC2 — — 50 mA f = 15 MHz, Iout = 0 mA
————————————————————————————————
ICC3 — 5 15 mA f = 1 MHz, Iout = 0 mA
———————————————————————————————————————————
Input low voltage*3 VIL –0.3*1 — 0.8 V
———————————————————————————————————————————
Input high voltage*3 VIH 2.2 — VCC + 1.0*2 V
———————————————————————————————————————————
Output low voltage VOL — — 0.45 V IOL = 2.1 mA
———————————————————————————————————————————
Output high voltage VOH1 2.4 — — V IOH = –1.0 mA
————————————————————————————————
VOH2 VCC – 0.7 — — V IOH = –100 µA
———————————————————————————————————————————
Notes: 1. VIL min = –1.0 V for pulse width ≤50 ns.
2. VIH max = VCC + 1.5 V for pulse width ≤20 ns.
If VIH is over the specified maximum value, read operation cannot be guaranteed.
3. Only defined for DC function test. VIL max = 0.45 V, VIH min = 2.4 V for AC function test.
4
HN27C256HG Series HN27C256HG Series
AC Characteristics (Ta = 0 to +70°C, VCC = 5 V ± 10%, VPP = VCC)
Test Conditions
• Input pulse levels: 0.45 V to 2.4 V
• Input rise and fall times: ≤10 ns
• Output load: 1TTL gate + 100 pF
• Reference levels for measuring timing: Inputs; 1.5 V
Outputs; 1.5 V
HN27C256HG-70 HN27C256HG-85
———————– ———————–
Parameter Symbol Min Max Min Max Unit Test conditions
———————————————————————————————————————————
Address to output delay tACC — 70 — 85 ns CE = OE = VIL
———————————————————————————————————————————
CE to output delay tCE — 70 — 85 ns OE = VIL
———————————————————————————————————————————
OE to output delay tOE — 40 — 45 ns CE = VIL
———————————————————————————————————————————
OE high to output float tDF 0 30 0 30 ns CE = VIL
———————————————————————————————————————————
Address to output hold tOH 5—5—nsCE = OE = VIL
———————————————————————————————————————————
Note: tDF is defined as the time at which the output achieves the open circuit condition and data is no
longer driven.
Read Timing Waveform
tACC
Address
CE
Data Out
OE
Standby Mode Active Mode Standby Mode
Data Out Valid
tOE tDF
tOH
tCE
5
HN27C256HG Series HN27C256HG Series
Fast High-Reliability Programming
This device can be applied the Fast High-
Reliability Programming Algorithm shown in
following flowchart. This algorithm offers both
faster programming time and high reliability data
retension. A theoretical programming time (except
brank checking and verifying time) is one-tenth of
conventional high performance programming
algorithm’s. Regarding the model and software
version of the programmers available this
algorithm, please contact programmer maker.
6
HN27C256HG Series HN27C256HG Series
START
SET PROG./VERIFY MODE
VPP = 12.5 ± 0.5 V, VCC = 6.0 ± 0.25 V
Address = 0
n = 0
n + 1 n
Program tPW = 0.2 ms ± 5%
VERIFY
GO
NOGO
NO
NO
YES
NOGO
YES
GO
Program tOPW = 0.2n ms
LAST
Address?
READ
All Address
END FAIL
n = 25
SET READ MODE
VCC = 5.0 V ± 0.5 V, VPP = VCC
Address + 1 Address
7
HN27C256HG Series HN27C256HG Series
DC Characteristics (Ta = 25°C ± 5°C, VCC = 6 V ± 0.25 V, VPP = 12.5 V ± 0.5 V)
Parameter Symbol Min Typ Max Unit Test conditions
———————————————————————————————————————————
Input leakage current ILI — — 2 µA Vin = 0 V to VCC
———————————————————————————————————————————
VPP supply current IPP ——30 mACE = VIL
———————————————————————————————————————————
Operating VCC current ICC ——30 mA
———————————————————————————————————————————
Input low level VIL –0.1*5 — 0.8 V
———————————————————————————————————————————
Input high level VIH 2.2 — VCC + 0.5*6 V
———————————————————————————————————————————
Output low voltage VOL — — 0.45 V IOL = 2.1 mA
during verify
———————————————————————————————————————————
Output high voltage VOH 2.4 — — V IOH = –400 µA
during verify
———————————————————————————————————————————
Notes: 1. VCC must be applied simultaneously or before VPP and removed simultaneously or after VPP.
2. VPP must not exceed 13.5 V including overshoot.
3. An influence may be had upon device reliability if the device is installed or removed while VPP =
12. 5V.
4. Do not alter VPP either VIL to 12.5 V or 12.5 V to VIL when CE = Low.
5. VIL min = –0.6 V for pulse width ≤20 ns.
6. If VIH is over the specified maximum value, programming operation cannot be guaranteed.
8
HN27C256HG Series HN27C256HG Series
AC Characteristics (Ta = 25°C ± 5°C, VCC = 6 V ± 0.25 V, VPP = 12.5 V ± 0.5 V)
Test Conditions
• Input pulse levels: 0.45 V to 2.4 V
• Input rise and fall times: ≤20 ns
• Reference levels for measuring timing: Inputs; 0.8 V and 2.0 V
Outputs; 0.8 V and 2.0 V
Parameter Symbol Min Typ Max Unit Test conditions
———————————————————————————————————————————
Address setup time tAS 2 ——µs
———————————————————————————————————————————
OE setup time tOES 2 ——µs
———————————————————————————————————————————
Data setup time tDS 2 ——µs
———————————————————————————————————————————
Address hold time tAH 0 ——µs
———————————————————————————————————————————
Data hold time tDH 2 ——µs
———————————————————————————————————————————
VPP setup time tVPS 2 ——µs
———————————————————————————————————————————
VCC setup time tVCS 2 ——µs
———————————————————————————————————————————
CE initial programming tPW 0.19 0.20 0.21 ms
pulse width
———————————————————————————————————————————
CE over programming tOPW*1 0.19 — 5.25 ms
pulse width
———————————————————————————————————————————
Data valid from OE tOE 0 — 150 ns
———————————————————————————————————————————
OE to output float delay tDF*2 — — 130 ns
———————————————————————————————————————————
Notes: 1. Refer to the Fast High-Reliability Programming Flowchart for tOPW.
2. tDF is defined as the time at which the output achieves the open circuit condition and data is no
longer driven.
Fast High-Reliability Programming Timing Waveform
tVPS
CE
Data
OE
Data In Stable
tOE
tAS
VPP
VCC
Data Out Valid
Program Program Verify
tDS
tVCS
tAH
tOES
tPW
VCC
VCC + 1
VCC
VPP
Address
tDH tDF
9
HN27C256HG Series HN27C256HG Series
High Performance Programming
This device can be applied the high performance
programming algorithm shown in following
flowchart. This algorithm is as same as our 256-
kbit EPROM series, so existing programmers can
be used with this device. This algorithm allows to
obtain faster programming time without any
voltage stress to the device nor deterioration in
reliability of programmed data.
10
HN27C256HG Series HN27C256HG Series
START
SET PROG./VERIFY MODE
VPP = 12.5 ± 0.5 V, VCC = 6.0 ± 0.25 V
Address = 0
n = 0
n + 1 n
Program tPW = 1.0 ms ± 5%
VERIFY
GO
NOGO
NO
NO
YES
NOGO
YES
GO
Program tOPW = 3n ms
LAST
Address?
READ
All Address
END FAIL
n = 25
SET READ MODE
VCC = 5.0 V ± 0.5 V, VPP = VCC
Address + 1 Address
11
HN27C256HG Series HN27C256HG Series
DC Characteristics (Ta = 25°C ± 5°C, VCC = 6 V ± 0.25 V, VPP = 12.5 V ± 0.5 V)
Parameter Symbol Min Typ Max Unit Test conditions
———————————————————————————————————————————
Input leakage current ILI — — 2 µA Vin = 0 V to VCC
———————————————————————————————————————————
VPP supply current IPP ——30 mACE = VIL
———————————————————————————————————————————
Operating VCC current ICC ——30 mA
———————————————————————————————————————————
Input low level VIL –0.1*5 — 0.8 V
———————————————————————————————————————————
Input high level VIH 2.2 — VCC + 0.5*6 V
———————————————————————————————————————————
Output low voltage VOL — — 0.45 V IOL = 2.1 mA
during verify
———————————————————————————————————————————
Output high voltage VOH 2.4 — — V IOH = –400 µA
during verify
———————————————————————————————————————————
Notes: 1. VCC must be applied simultaneously or before VPP and removed simultaneously or after VPP.
2. VPP must not exceed 13.5 V including overshoot.
3. An influence may be had upon device reliability if the device is installed or removed while VPP =
12. 5V.
4. Do not alter VPP either VIL to 12.5 V or 12.5 V to VIL when CE = Low.
5. VIL min = –0.6 V for pulse width ≤20 ns.
6. If VIH is over the specified maximum value, programming operation cannot be guaranteed.
12
HN27C256HG Series HN27C256HG Series
AC Characteristics (Ta = 25°C ± 5°C, VCC = 6 V ± 0.25 V, VPP = 12.5 V ± 0.5 V)
Test Conditions
• Input pulse levels: 0.45 V to 2.4 V
• Input rise and fall times: ≤20 ns
• Reference levels for measuring timing: Inputs; 1.5 V
Outputs; 1.5 V
Parameter Symbol Min Typ Max Unit Test conditions
———————————————————————————————————————————
Address setup time tAS 2 ——µs
———————————————————————————————————————————
OE setup time tOES 2 ——µs
———————————————————————————————————————————
Data setup time tDS 2 ——µs
———————————————————————————————————————————
Address hold time tAH 0 ——µs
———————————————————————————————————————————
Data hold time tDH 2 ——µs
———————————————————————————————————————————
VPP setup time tVPS 2 ——µs
———————————————————————————————————————————
VCC setup time tVCS 2 ——µs
———————————————————————————————————————————
CE initial programming tPW 0.95 1.0 1.05 ms
pulse width
———————————————————————————————————————————
CE over programming tOPW*1 2.85 — 78.75 ms
pulse width
———————————————————————————————————————————
Data valid from OE tOE 0 — 150 ns
———————————————————————————————————————————
OE to output float delay tDF*2 — — 130 ns
———————————————————————————————————————————
Notes: 1. Refer to the high performance programming flowchart for tOPW.
2. tDF is defined as the time at which the output achieves the open circuit condition and data is no
longer driven.
High Performance Programming Timing Waveform
tVPS
CE
Data
OE
tOE
tAS
VPP
VCC
Data Out Valid
Program Program Verify
tDS
tVCS
tAH
tOES
tPW
VCC
VCC + 1
VCC
VPP
Address
tDH tDF
Data In Stable
13
HN27C256HG Series HN27C256HG Series
Erase
Erasure of HN27C256HG is performed by
exposure to ultraviolet light of 2537 Å and all the
output data are changed to “1” after this erasure
procedure. The minimum integrated dose (i.e. UV
intensity ×exposure time) for erasure is 15
W•sec/cm2.
Mode Description
Device Identifier Mode
Programming condition of EPROM is various
according to EPROM manufacturers and device
types. It may cause miss operation. To
countermeasure it, some EPROMs provide maker
identifier code. Users can write EPROM by
reading out write condition coded before shipped.
Some commercial programmers can set write
condition by recognizing this code. This function
enables effective program. Regarding commercial
programmers that can recognize this device’s
identifier code, please contact programmer maker.
14
HN27C256HG Series HN27C256HG Series
HN27C256HG Series Identifier Code
A0 I/O7 I/O6 I/O5 I/O4 I/O3 I/O2 I/O1 I/O0
——————————————————————————————— Hex
Identifier (10) (19) (18) (17) (16) (15) (13) (12) (11) data
———————————————————————————————————————————
Manufacturer code VIL 0000011107
———————————————————————————————————————————
Device code VIH 0011000131
———————————————————————————————————————————
Notes: 1. A9 = 12.0 V ± 0.5 V.
2. A1 – A8, A10 – A14, CE, OE = VIL.
15
HN27C256HG Series HN27C256HG Series
Electrical Characteristics Curves
456
0
0.5
1.0
1.5
2.0
Supply Current ICC2 (Normalized)
Supply Voltage VCC (V)
Ta = 25°C
f = 15 MHz
Supply Current vs. Supply Voltage
04080
0
0.5
1.0
1.5
2.0
Supply Current ICC2 (Normalized)
Ambient Temperature Ta (°C)
VCC = 5 V
f = 15 MHz
Supply Current vs. Ambient Temperatrure
20 60
10 15
0
0.5
1.0
1.5
2.0
Supply Current ICC2 (Normalized)
Frequency f (MHz)
Ta = 25°C
VCC = 5 V
Supply Current – Frequency
5456
0
0.5
1.0
1.5
2.0
Access Time tOE (Normalized)
Supply Voltage VCC (V)
Access Time – Supply Voltage
16
HN27C256HG Series HN27C256HG Series
Electrical Characteristics Curves (Cont)
456
0
0.5
1.0
1.5
2.0
Access Time tACC (Normalized)
Supply Voltage VCC (V)
Ta = 25°C
Access Time – Supply Voltage
04080
0
0.5
1.0
1.5
2.0
Access Time tACC (Normalized)
Ambient Temperature Ta (°C)
VCC = 5 V
Access Time – Ambient Temperature
20 60
024
0
0.5
1.0
1.5
2.0
Output Voltage VOL (Normalized)
Output Current IOH (mA)
Ta = 25°C
VCC = 5 V
Output Voltage vs. Ooutput Current
13 0 –1.0 –2.0
0
0.5
1.0
1.5
2.0
Output Voltage VOH (Normalized)
Output Current IOH (mA)
Ta = 25°C
VCC = 5 V
Output Voltage vs. Output Current
–0.5 –1.5
17
HN27C256HG Series HN27C256HG Series
Electrical Characteristics Curves (Cont)
456
0
0.5
1.0
1.5
2.0
Standby Current ISB (Normalized)
Supply Voltage VCC (V)
Ta = 25°C
Standby Current vs. Supply Voltage
04080
0
0.5
1.0
1.5
2.0
Standby Current ISB (Normalized)
Ambient Temperature Ta (°C)
VCC = 5 V
Standby Current vs. Ambient Temperature
20 60
