ICST ICS553M, ICS553MT Datasheet
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER
Description
The ICS553 is a low skew, single input to four output,
clock buffer. Part of ICS’ Clock Blocks
our lowest skew, small clock buffer. See the ICS552-02
for a 1 to 8 low skew buffer. For more than 8 outputs
see the MK74CBxxx Buffalo
ICS makes many non-PLL and PLL based low skew
output devices as well as Z ero Delay Buffers to
synchronize clocks. Contact us for all of your clocking
needs.
TM
series of clock drivers.
TM
family, this is
Block Diagram
Features
• Extremely low skew outputs (50ps maximum)
• Packaged in 8 pin SOIC
• Low power CMOS technology
• Operating Voltages of 2.5 to 5V
• Output Enable pin tri-states outputs
• 5V tolerant input clock
IC L K
Q0
Q1
Q2
Q3
Output Enable
MDS 553 B 1 Revision 052501
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95 126 ● tel (408) 295-9800 ● www.icst.com
Pin Assignment
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER
VDD
Q0
Q1
GND
1
2
3
4
8 Pin (150 mil) SOIC
Pin Descriptions
Pin
Number
1 VDD Power Connect to +2.5V, +3.3V or +5.0V.
2 Q0 Output Clock Output 0
3 Q1 Output Clock Output 1
4 GND Power Ground
5 ICLK Input Clock Input. 5V tolerant input.
Pin
Name
8
7
6
5
Type
Pin
OE
Q3
Q2
ICLK
Pin Description
6 Q2 Output Clock Output 2
7 Q3 Output Clock Output 3
8 OE Input Output Enable. Tri-states outputs when low.
External Components
A minimum number of external components are required for proper operation. A decoupling capacitor of
0.01 µF should be connected between VDD on pin 1 and GND on pin 4, as close to the device as possible.
A 33 Ω series terminating resistor may be used on each clock output if the trace is longer than 1 inch.
To achieve the low output skew that the ICS553 is capable of, careful attention must be paid to board
layout. Essentially, all 4 outputs must have identical terminations, identical loads and identical trace
geometries. If they do not, the output skew will be degraded. For example, using a 30Ω series termination
on one output (with 33Ω on the others) will cause at least 15ps of skew.
MDS 553 B 2 Revision 052501
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 295-9800 ● www.icst.com
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