DATASHEET
LOW SKEW 1 TO 4 CLOCK BUFFER ICS553
IDT™ / ICS™
LOW SKEW 1 TO 4 CLOCK BUFFER 1
ICS553 REV M 121809
Description
The ICS553 is a low skew, single input to four output,
clock buffer. Part of IDT’s 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.
IDT 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
•Commercial (0 to +70°C) and Industrial (-40 to
+85°C) temperature ranges available
NOTE: EOL for non-green parts to occur on 5/13/10
per PDN U-09-01
Block Diagram
Q0
ICLK
Q1
Q2
Q3
Output Enable
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER FAN OUT BUFFER
IDT™ / ICS™
LOW SKEW 1 TO 4 CLOCK BUFFER 2
ICS553 REV M 121809
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 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 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
5
OE
8-pin SOIC
Pin
Number
Pin
Name
Pin
Type
Pin Description
1 VDD Power Connect to +2.5 V, +3.3 V or +5.0 V.
2 Q0 Output Clock output 0.
3 Q1 Output Clock output 1.
4 GND Power Connect to ground.
5 ICLK Input Clock input, 5 V tolerant input.
6 Q2 Output Clock Output 2.
7 Q3 Output Clock Output 3.
8 OE Input Output Enable. Tri-states outputs when low. Connect to VDD for normal operation.
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER FAN OUT BUFFER
IDT™ / ICS™
LOW SKEW 1 TO 4 CLOCK BUFFER 3
ICS553 REV M 121809
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS553. 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=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 (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) +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
Input High Voltage, OE VIH 1.8 VDD V
Input Low Voltage, OE VIL 0.7 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, OE pin 5 pF
Short Circuit Current IOS ±28 mA
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER FAN OUT BUFFER
IDT™ / ICS™
LOW SKEW 1 TO 4 CLOCK BUFFER 4
ICS553 REV M 121809
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
Input High Voltage, OE VIH 2VDDV
Input Low Voltage, OE VIL 0.8 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, OE pin 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
Input High Voltage, OE VIH 2VDDV
Input Low Voltage, OE VIL 0.8 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, OE pin 5 pF
Short Circuit Current IOS ±80 mA
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER FAN OUT BUFFER
IDT™ / ICS™
LOW SKEW 1 TO 4 CLOCK BUFFER 5
ICS553 REV M 121809
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 IDT for tight duty cycle clock
generators.
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
Additive Period Jitter 1 ps
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
Additive Period Jitter 1 ps
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
Additive Period Jitter 1 ps
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
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER FAN OUT BUFFER
IDT™ / ICS™
LOW SKEW 1 TO 4 CLOCK BUFFER 6
ICS553 REV M 121809
Thermal Characteristics
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
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER FAN OUT BUFFER
IDT™ / ICS™
LOW SKEW 1 TO 4 CLOCK BUFFER 7
ICS553 REV M 121809
Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Narrow Body)
Package dimensions are kept current with JEDEC Publication No. 95
Ordering Information
*NOTE: EOL for non-green parts to occur on 5/13/10 per PDN U-09-01
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)
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
553MLF 553MLF Tubes 8-pin SOIC 0 to +70°C
553MLFT 553MLF Tape and Reel 8-pin SOIC 0 to +70°C
553MI* 553MI Tubes 8-pin SOIC -40 to +85 °C
553MIT* 553MI Tape and Reel 8-pin SOIC -40 to +85 °C
553MILF 553MILF Tubes 8-pin SOIC -40 to +85 °C
553MILFT 553MILF 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.
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Corporate Headquarters
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www.idt.com
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800-345-7015
408-284-8200
Fax: 408-284-2775
For Tech Support
www.idt.com/go/clockhelp
Innovate with IDT and accelerate your future networks. Contact:
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ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER FAN OUT BUFFER
