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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
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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
Page 3
Absolute Maximum Ratings
Stresses above the ratings listed below can cause permanent damage to the ICS553. 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.
Item Rating
Supply Voltage, VDD 7V
All Inputs and Outputs -0.5V to VDD+0.5V
Ambient Operating Temperature 0 to +70°C
Storage Temperature -65 to +150°C
Junction Temperature 175°C
Soldering Temperature 260°C
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER
Recommended Operation Conditions
Parameter Min. Typ. Max. Units
Ambient Operating Temperature 0 –+70°C
Power Supply Voltage (measured in respect to GND) +2.375 +5.25 V
DC Electrical Characteristics
VDD=2.5V ±5%, Ambient temperature 0 to +70
Parameter Symbol Conditions Min. Typ. Max. Units
Operating Voltage VDD 2.375 2.625 V
Input High Voltage, ICLK V
Input Low Voltage, ICLK V
Input High Voltage, OE V
Input Low Voltage, OE V
Output High Voltage V
Output Low Voltage V
Operating Supply Current IDD No load, 135 MHz 25 mA
Short Circuit Current I
OH
OL
OS
IH
IL
IH
IL
I
OH
IOL = 16 mA 0.5 V
C, unless stated otherwise
°
Note 1 VDD/2+0.5 5.5 V
Note 1 VDD/2-0.5 V
2VDDV
0.4 V
= -16 mA 2 V
±28 mA
MDS 553 B 3 Revision 052501
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 295-9800 ● www.icst.com
Page 4
DC Electrical Characteristics (continued)
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER
VDD=3.3V ±5% , Ambient temperature 0 to +70
C, unless stated otherwise
°
Parameter Symbol Conditions Min. Typ. Max. Units
Operating Voltage VDD 3.15 3.45 V
Input High Voltage, ICLK V
Input Low Voltage, ICLK V
Input High Voltage, OE V
Input Low Voltage, OE V
Output High Voltage V
Output Low Voltage V
Output High Voltage (CMOS
V
IH
IL
IH
IL
OH
OL
OH
Note 1 VDD/2+0.7 5.5 V
Note 1 VDD/2-0.7 V
2VDDV
0.4 V
I
= -25 mA 2.4 V
OH
IOL = 25 mA 0.8 V
I
= -12 mA VDD-0.4 V
OH
Level)
Operating Supply Current IDD No load, 135 MHz 35 mA
Short Circuit Current I
OS
VDD=5V ±5% , Ambient temperature 0 to +70
C, unless stated otherwise
°
±50 mA
Parameter Symbol Conditions Min. Typ. Max. Units
Operating Voltage VDD 4.75 5.25 V
Input High Voltage, ICLK V
Input Low Voltage, ICLK V
Input High Voltage, OE V
Input Low Voltage, OE V
Output High Voltage V
Output Low Voltage V
Output High Voltage (CMOS
IH
IL
IH
IL
OH
OL
V
OH
Level)
Operating Supply Current IDD No load, 135 MHz 50 mA
Short Circuit Current I
OS
Note 1 VDD/2+1 5.5 V
Note 1 VDD/2-1 V
2VDDV
0.4 V
I
= -45 mA 2.4 V
OH
IOL = 45 mA 0.8 V
I
= -12 mA VDD-0.4 V
OH
±80 mA
Notes: 1. Nominal switching threshold is VDD/2
MDS 553 B 4 Revision 052501
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 295-9800 ● www.icst.com
Page 5
AC Electrical Characteristics
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER
VDD = 2.5V ±5%, Ambient Temperature 0 to +70
C, unless stated otherwise
°
Parameter Symbol Conditions Min. Typ. Max. Units
Input Frequency 0 200 MHz
Output Rise Time t
Output Fall Time t
Propagation Delay Note 1 3 ns
Output to output skew Note 2 Rising edges at VDD/2 0 50 ps
OR
OF
VDD = 3.3V ±5%, Ambient Temperature 0 to +70
0.8 to 2.0V, CL=15pF 1.5 ns
2.0 to 0.8V, CL=15pF 1.5 ns
C, unless stated otherwise
°
Parameter Symbol Conditions M in. Typ. Max. Units
Input Frequency 0 200 MHz
Output Rise Time t
Output Fall Time t
Propagation Delay Note 1 2.6 ns
Output to output skew Note 2 Rising edges at VDD/2 0 50 ps
OR
OF
0.8 to 2.0V, CL=15pF 1.0 ns
2.0 to 0.8V, CL=15pF 1.0 ns
VDD = 5V ±5%, Ambient Temperature 0 to +70
C, unless stated otherwise
°
Parameter Symbol Conditions M in. Typ. Max. Units
Input Frequency 0 200 MHz
Output Rise Time t
Output Fall Time t
Propagation Delay Note 1 2.5 ns
Output to output skew Note 2 Rising edges at VDD/2 0 50 ps
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.
OR
OF
0.8 to 2.0V, CL=15pF 0.7 ns
2.0 to 0.8V, CL=15pF 0.7 ns
MDS 553 B 5 Revision 052501
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 295-9800 ● www.icst.com
Page 6
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER
Package Outline and Package Dimensions (8 pin SOIC, 150 Mil. Narrow Body)
Package dimensions are kept current with JEDEC Publication No. 95
Millimeters Inches
Symbol Min Max Min Max
A 1.35 1.75 0.0532 0.0688
A1 1.10 0.25 0.0040 0.0098
B 0.33 0.51 0.013 0.020
C 0.19 0.25 0.0075 0.0098
D 4.80 5.00 .1890 .1968
Index
Area
EH
E 3.80 4.00 0.1497 0.1574
e 1.27 Basic 0.050 Basic
H 5.80 6.20 0.2284 0.2440
h 0.25 0.50 0.010 0.020
L 0.40 1.27 0.016 0.050
a0°8
°
0
°
8
°
Pin 1
Q
D
c
be
h x 45
0
A
Ordering Information
Part / Order Number Marking Shipping
packaging
ICS553M ICS553M Tubes 8 pin SOIC 0 to +70° C
ICS553MT ICS553M Tape and Reel 8 pin SOIC 0 to +70° C
While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS)
assumes no responsibility for either its use or for the infringement of any patent s or other rights of t hird 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 oth er ap pl ic ations such as those req uiri ng extended tempera ture ran ge, high reliabilit y, 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.
Package Temperature
MDS 553 B 6 Revision 052501
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 295-9800 ● www.icst.com
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