DATASHEET
LOW SKEW 1 TO 4 CLOCK BUFFER ICS524
IDT™ / ICS™
LOW SKEW 1 TO 4 CLOCK BUFFER 1
ICS524 REV A 101705
Description
The ICS524 is a low skew, single input to four output, clock
buffer. Part of ICS’ ClockBlocksTM family, this is our lowest
skew, small clock buffer.
See the ICS552-02 for a 1 to 8 low skew buffer. For more
than eight outputs, see the MK74CBxxx BuffaloTM series of
clock drivers.
ICS makes many non-PLL and PLL based low skew output
devices as well as Zero Delay Buffers to synchronize
clocks. Contact us for all of your clocking needs.
Features
•Extremely low skew outputs (50 ps maximum)
•Packaged in 8-pin SOIC
•Available in Pb (lead) free package
•Low power CMOS technology
•Operating voltages of 2.5 V to 5 V
•Output Enable pin tri-states outputs
•5 V tolerant input clock
•Industrial temperature range
Block Diagram
Q0
ICLK
Q1
Q2
Q3
ICS524
LOW SKEW 1 TO 4 CLOCK BUFFER FAN OUT BUFFER
IDT™ / ICS™
LOW SKEW 1 TO 4 CLOCK BUFFER 2
ICS524 REV A 101705
Pin Assignment
Pin Descriptions
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 5 and GND on pin 8, 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 ICS524 is capable of, careful attention must be paid to board layout.
Essentially, all four 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 15 ps of skew.
1
2
3
VDD
4
Q0
Q1
Q3
GND
Q2
ICLK 8
7
6
5NC
8-pin SOIC
Pin
Number
Pin
Name
Pin
Type
Pin Description
1 ICLK Input Clock input, 5V tolerant input.
2 Q0 Output Clock output 0.
3 Q1 Output Clock output 1.
4 NC - Do not connect this pin to anything.
5 VDD Power Connect to +2.5 V, +3.3 V or +5.0 V.
6 Q2 Output Clock Output 2.
7 Q3 Output Clock Output 3.
8 GND Power Connect to ground.
ICS524
LOW SKEW 1 TO 4 CLOCK BUFFER FAN OUT BUFFER
IDT™ / ICS™
LOW SKEW 1 TO 4 CLOCK BUFFER 3
ICS524 REV A 101705
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS524. These ratings, which are
standard values for ICS 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=2.5 V ±5%, Ambient temperature -40 to +85°C, unless stated otherwise
Item Rating
Supply Voltage, VDD 7 V
Output Enable and All Outputs -0.5 V to VDD+0.5 V
ICLK -0.5 V to 5.5 V
Ambient Operating Temperature -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 -40 +85 °C
Power Supply Voltage (measured in respect to GND) +2.375 +5.25 V
Parameter Symbol Conditions Min. Typ. Max. Units
Operating Voltage VDD 2.375 2.625 V
Input High Voltage, ICLK VIH Note 1 VDD/2+0.5 5.5 V
Input Low Voltage, ICLK VIL Note 1 VDD/2-0.5 V
Output High Voltage VOH IOH = -16 mA 2 V
Output Low Voltage VOL IOL = 16 mA 0.4 V
Operating Supply Current IDD No load, 135 MHz 25 mA
Nominal Output Impedance ZO20 Ω
Input Capacitance CIN ICLK 5 pF
Short Circuit Current IOS ±28 mA
ICS524
LOW SKEW 1 TO 4 CLOCK BUFFER FAN OUT BUFFER
IDT™ / ICS™
LOW SKEW 1 TO 4 CLOCK BUFFER 4
ICS524 REV A 101705
DC Electrical Characteristics (continued)
VDD=3.3 V ±5% , Ambient temperature -40 to +85°C, unless stated otherwise
VDD=5 V ±5% , Ambient temperature -40 to +85°C, unless stated otherwise
Notes: 1. Nominal switching threshold is VDD/2
Parameter Symbol Conditions Min. Typ. Max. Units
Operating Voltage VDD 3.15 3.45 V
Input High Voltage, ICLK VIH Note 1 VDD/2+0.7 5.5 V
Input Low Voltage, ICLK VIL Note 1 VDD/2-0.7 V
Output High Voltage VOH IOH = -25 mA 2.4 V
Output Low Voltage VOL IOL = 25 mA 0.4 V
Output High Voltage (CMOS
Level)
VOH IOH = -12 mA VDD-0.4 V
Operating Supply Current IDD No load, 135 MHz 35 mA
Nominal Output Impedance ZO20 Ω
Input Capacitance CIN ICLK 5 pF
Short Circuit Current IOS ±50 mA
Parameter Symbol Conditions Min. Typ. Max. Units
Operating Voltage VDD 4.75 5.25 V
Input High Voltage, ICLK VIH Note 1 VDD/2+1 5.5 V
Input Low Voltage, ICLK VIL Note 1 VDD/2-1 V
Output High Voltage VOH IOH = -35 mA 2.4 V
Output Low Voltage VOL IOL = 35 mA 0.4 V
Output High Voltage (CMOS
Level)
VOH IOH = -12 mA VDD-0.4 V
Operating Supply Current IDD No load, 135 MHz 45 mA
Nominal Output Impedance ZO20 Ω
Input Capacitance CIN ICLK 5 pF
Short Circuit Current IOS ±80 mA
ICS524
LOW SKEW 1 TO 4 CLOCK BUFFER FAN OUT BUFFER
IDT™ / ICS™
LOW SKEW 1 TO 4 CLOCK BUFFER 5
ICS524 REV A 101705
AC Electrical Characteristics
VDD = 2.5 V ±5%, Ambient Temperature -40 to +85°C, unless stated otherwise
VDD = 3.3 V ±5%, Ambient Temperature -40 to +85°C, unless stated otherwise
VDD = 5 V ±5%, Ambient Temperature -40 to +85°C, unless stated otherwise
Notes: 1. With rail to rail input clock
2. Between any 2 outputs with equal loading.
3. Duty cycle on outputs will match incoming clock duty cycle. Consult ICS for tight duty cycle clock
generators.
Thermal Characteristics
Parameter Symbol Conditions Min. Typ. Max. Units
Input Frequency 0 200 MHz
Output Rise Time tOR 0.8 to 2.0 V, CL=15 pF 1.0 1.5 ns
Output Fall Time tOF 2.0 to 0.8 V, CL=15 pF 1.0 1.5 ns
Propagation Delay Note 1 2.2 3 5 ns
Output to Output Skew Note 2 Rising edges at VDD/2 0 50 ps
Device to Device Skew Rising edges at VDD/2 500 ps
Parameter Symbol Conditions Min. Typ. Max. Units
Input Frequency 0 200 MHz
Output Rise Time tOR 0.8 to 2.0 V, CL=15 pF 0.6 1.0 ns
Output Fall Time tOF 2.0 to 0.8 V, CL=15 pF 0.6 1.0 ns
Propagation Delay Note 1 2.0 2.4 4 ns
Output to Output Skew Note 2 Rising edges at VDD/2 0 50 ps
Device to Device Skew Rising edges at VDD/2 500 ps
Parameter Symbol Conditions Min. Typ. Max. Units
Input Frequency 0 200 MHz
Output Rise Time tOR 0.8 to 2.0 V, CL=15 pF 0.3 0.7 ns
Output Fall Time tOF 2.0 to 0.8 V, CL=15 pF 0.3 0.7 ns
Propagation Delay Note 1 1.8 2.5 4 ns
Output to Output Skew Note 2 Rising edges at VDD/2 0 50 ps
Device to Device Skew Rising edges at VDD/2 500 ps
Parameter Symbol Conditions Min. Typ. Max. Units
Thermal Resistance Junction to
Ambient
θJA Still air 150 °C/W
θJA 1 m/s air flow 140 °C/W
θJA 3 m/s air flow 120 °C/W
Thermal Resistance Junction to Case θJC 40 °C/W
ICS524
LOW SKEW 1 TO 4 CLOCK BUFFER FAN OUT BUFFER
IDT™ / ICS™
LOW SKEW 1 TO 4 CLOCK BUFFER 6
ICS524 REV A 101705
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 Circuit Systems (ICS) 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 ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS
does not authorize or warrant any ICS product for use in life support devices or critical medical instruments.
Part / Order Number Marking Shipping Packaging Package Temperature
ICS524MILF 524MILF Tubes 8-pin SOIC -40 to +85 °C
ICS524MILFT 524MILF Tape and Reel 8-pin SOIC -40 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 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.
Printed in USA
Corporate Headquarters
Integrated Device Technology, Inc.
6024 Silver Creek Valley Road
San Jose, CA 95138
United States
800 345 7015
+408 284 8200 (outside U.S.)
Asia Pacific and Japan
Integrated Device Technology
Singapore (1997) Pte. Ltd.
Reg. No. 199707558G
435 Orchard Road
#20-03 Wisma Atria
Singapore 238877
+65 6 887 5505
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Prime House
Barnett Wood Lane
Leatherhead, Surrey
United Kingdom KT22 7DE
+44 1372 363 339
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Fax: 408-284-2775
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ICS524
LOW SKEW 1 TO 4 CLOCK BUFFER FAN OUT BUFFER
