DATASHEET
ZERO DELAY, LOW SKEW BUFFER MK2304-2
IDT™
ZERO DELAY, LOW SKEW BUFFER 1
MK2304-2 REV G 051310
Description
The MK2304-2 is a low jitter, low skew, high performance
Phase Lock Loop (PLL) based zero delay buffer for high
speed applications. Based on IDT’s proprietary low jitter
PLL techniques, the device provides four low skew outputs
at speeds up to 133 MHz at 3.3 V. The MK2304-2 includes
a bank of two outputs running at 1/2X. In the zero delay
mode, the rising edge of the input clock is aligned with the
rising edges of all 4 outputs. Compared to competitive
CMOS devices, the MK2304-2 has the lowest jitter.
The MK2304-2 PLL enters a power-down state when there
are no rising edges on the REF input. In this mode, all
outputs are tri-stated and the PLL is turned off, resulting in
leass than 25 µA of current draw.
IDT manufactures the largest variety of clock generators
and buffers and is the largest clock supplier in the world.
Features
•Packaged in 8 pin SOIC
•Zero input-output delay
•Two 1X outputs plus two 1/2X outputs
•Output to output skew is less than 200 ps
•Output clocks up from 10 MHz to 133 MHz at 3.3 V
•Ability to generate 2X the input
•Full CMOS outputs with 8 mA output drive capability at
TTL levels at 3.3 V
•Spread SmartTM technology works with spread spectrum
clock generators
•Advanced, low power, sub micron CMOS process
•Operating voltage of 3.3 V
•Available in industial temperature operation
•Pb (lead) free package
•Low Standby Current
Block Diagram
CLKA2
CLKB1
CLKB2
CLKA1
PLL
FBIN
CLKIN
/2
VDD
1
GND
1
BANK
A
BANK
B
MK2304-2
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IDT™
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MK2304-2 REV G 051310
Pin Assignment Feedback Configuration Table
Pin Descriptions
External Components
The Mk2304-2 requires a minimum number of external components for proper operation. Decoupling capacitors of
0.1µF should be connected between VDD and GND, as close to the part as possible. A 33Ω series terminating
resistor should be used on each clock output to reduce reflections.
REF
CLKA1
CLKA2
VDD
GND
CLKB2
CLKB1
FBK1
2
3
4
8
7
6
5
8 Pin (150 mil) SOIC
Feedback From CLKA1:A2 CLKB1:B2
Bank A CLKIN CLKIN/2
Bank B 2XCLKIN CLKIN
Pin
Number
Pin
Name
Pin
Type
Pin Description
1 REF Input Clock input. Connect to input clock source, 5 V tolerant input.
2 CLKA1 Output Clock A1 output.
3 CLKA2 Output Clock A2 output.
4 GND Power Connect to ground.
5 CLKB1 Output Clock B1 output.
6 CLKB1 Output Clock B2 output.
7 VDD Power 3.3V Power Supply.
8 FBK Input PLL feedback input
MK2304-2
ZERO DELAY, LOW SKEW BUFFER ZDB
IDT™
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MK2304-2 REV G 051310
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the MK2304-2. These ratings, which are
standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device at these
or any other conditions above those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical
parameters are guaranteed only over the recommended operating temperature range.
Recommended Operation Conditions
DC Electrical Characteristics
VDD=3.3 V ±10%, Amb temp -40° C to 85° C
Item Rating
Supply Voltage, VDD 7 V
All Inputs and Outputs, except CLKIN -0.5 V to VDD+0.5 V
CLKIN -0.5 V to +5.5 V
Ambient Operating Temperature (commercial) 0 to +70 °C
Ambient Operating Temperature (industrial) -40 to +85 °C
Storage Temperature -65 to +150 °C
Junction Temperature 125 °C
Soldering Temperature 260 °C
Parameter Min. Typ. Max. Units
Ambient Operating Temperature (commercial) 0 +70 °C
Ambient Operating Temperature (industrial) -40 +85 °C
Power Supply Voltage (measured in respect to GND) +3.0 +3.6 V
Parameter Symbol Conditions Min. Typ. Max. Units
Operating Voltage VDD 3.0 3.6 V
Input High Voltage VIH 2V
Input Low Voltage VIL 0.8 V
Output High Voltage VOH IOH = -8 mA 2.4 V
Output Low Voltage VOL IOL = 8 mA 0.4 V
Operating Supply Current
100 MHz, CLKIN
IDD No Load 45 mA
Stand by Supply Current
0 MHz, CLKIN
IDD No Load 12 25 uA
Short Circuit Current IOS Each output TBD mA
Input Capacitance CIN FBIN 7 pF
Power-up Time 50 ms
MK2304-2
ZERO DELAY, LOW SKEW BUFFER ZDB
IDT™
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MK2304-2 REV G 051310
AC Electrical Characteristics
VDD = 3.3V ±10%, Ambient Temperature -40° C to 85° C
Thermal Characteristics
Parameter Symbol Conditions Min. Typ. Max. Units
Output Frequency FBIN to CLKA1,
30 pF Load
10 100 MHz
Output Frequency FBIN to CLKA1,
15 pf Load
10 133 MHz
Output Rise Time tOR 0.8 to 2.0 V, CL=30 pF 2.2 ns
Output Rise Time tOR 0.8 to 2.0 V, CL=15 pF 1.5 ns
Output Fall Time tOF 0.8 to 2.0 V, CL=30 pF 2.2 ns
Output Fall Time tOF 0.8 to 2.0 V, CL=15 pF 1.5 ns
Output Clock Duty Cycle At 1.4 V, CL=30 pf 40 50 60 %
Output Clock Duty Cycle At 1.4 V, CL=15 pf 45 50 65 %
Device-to-Device skew, equally
loaded
Rising edges at VDD/2 500 ps
Output-to-Output skew, equally
loaded, On same bank
Rising edges at VDD/2 200 ps
Skew from Output Bank A to
Output Bank B
All outputs equally
loaded
400 ps
Delay CLKIN Rising Edge to
FBIN Rising Edge
Measured at VDD/2 ±250 ps
Cycle-to-Cycle Jitter 30 pF loads
66.67 MHz outputs
400 ps
15 pF loads
66.67 MHz outputs
375 ps
PLL Lock Time tLOCK Stable power supply,
valid clocks on CLKIN,
FBIN
1ms
Parameter Symbol Conditions Min. Typ. Max. Units
Thermal Resistance Junction to
Ambient
θJA Still air 120 °C/W
θJA 1 m/s air flow 115 °C/W
θJA 3 m/s air flow 105 °C/W
Thermal Resistance Junction to Case θJC 58 °C/W
MK2304-2
ZERO DELAY, LOW SKEW BUFFER ZDB
IDT™
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MK2304-2 REV G 051310
Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Narrow Body)
Package dimensions are kept current with JEDEC Publication No. 95
Ordering Information
Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant.
While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (IDT) assumes
no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No
other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications
such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not
recommended without additional processing by IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT
does not authorize or warrant any IDT product for use in life support devices or critical medical instruments.
Part / Order Number Marking Shipping Packaging Package Temperature
MK2304S-2LF 2304S02L Tubes 8-pin SOIC 0 to 70° C
MK2304S-2LFTR 2304S02L Tape and Reel 8-pin SOIC 0 to 70° C
MK2304S-2ILF 2304S2IL Tubes 8-pin SOIC -40° C to 85° C
MK2304S-2ILFTR 2304S2IL Tape and Reel 8-pin SOIC -40° C to 85° C
INDEX
AREA
1 2
8
D
E
SEATING
PLANE
A1
A
e
- C -
B
.10 (.004) C
C
L
H
h x 45
*For reference only. Controlling dimensions are in mm.
Millimeters Inches*
Symbol Min Max Min Max
A 1.35 1.75 .0532 .0688
A1 0.10 0.25 .0040 .0098
B 0.33 0.51 .013 .020
C 0.19 0.25 .0075 .0098
D 4.80 5.00 .1890 .1968
E 3.80 4.00 .1497 .1574
e 1.27 BASIC 0.050 BASIC
H 5.80 6.20 .2284 .2440
h 0.25 0.50 .010 .020
L 0.40 1.27 .016 .050
α0°8°0°8°
© 2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT and the IDT logo are trademarks of Integrated Device
Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered
trademarks used to identify products or services of their respective owners.
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www.idt.com
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800-345-7015
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www.idt.com/go/clockhelp
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MK2304-2
ZERO DELAY, LOW SKEW BUFFER ZDB
