ICS553
MDS 553 B
1
Revision 052501
I n t e g r a t e d C i r cu i t S y st e m s
q
5 2 5 Ra ce S t r e e t , S a n J o s e , C A 9 5 1 2 6
q
t e l ( 4 0 8 ) 2 9 5 - 9 8 0 0
q
w w w. i c s t . c o m
L
OW
S
KEW
1
TO
4 C
LOCK
B
UFFER
Description
The ICS553 is a low skew, single input to four output,
clock buffer. Part of ICS' Clock Blocks
TM
family, this is
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
TM
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 (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
Block Diagram
Q 0
IC L K
Q 1
Q 2
Q 3
O u tp u t E n a b le
L
OW
S
KEW
1
TO
4 C
LOCK
B
UFFER
MDS 553 B
2
Revision 052501
I n t e g r a t e d C i r c u i t S y s t e ms
q
5 2 5 R a c e S t r e e t , S a n J o s e , CA 9 5 1 2 6
q
t e l ( 4 0 8 ) 2 9 5 - 9 8 0 0
q
w w w. ic s t . c o m
ICS553
Pin Assignment
Pin Descriptions
External Components
A minimum number of external components are required for proper operation. A decoupling capacitor of
0.01
F should be connected between VDD on pin 1 and GND on pin 4, as close to the device as possible.
A 33
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 30
series termination
on one output (with 33
on the others) will cause at least 15ps of skew.
1
2
3
VDD
4
Q0
Q1
Q3
GND
Q2
I CLK
8
7
6
5
OE
8 Pi n ( 150 mi l ) SOI C
Pin
Number
Pin
Name
Pin
Type
Pin Description
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.
6
Q2
Output
Clock Output 2
7
Q3
Output
Clock Output 3
8
OE
Input
Output Enable. Tri-states outputs when low.
L
OW
S
KEW
1
TO
4 C
LOCK
B
UFFER
MDS 553 B
3
Revision 052501
I n t e g r a t e d C i r c u i t S y s t e ms
q
5 2 5 R a c e S t r e e t , S a n J o s e , CA 9 5 1 2 6
q
t e l ( 4 0 8 ) 2 9 5 - 9 8 0 0
q
w w w. ic s t . c o m
ICS553
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.
Recommended Operation Conditions
DC Electrical Characteristics
VDD=2.5V 5%
, Ambient temperature 0 to +70
C, unless stated otherwise
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
Parameter
Min.
Typ.
Max.
Units
Ambient Operating Temperature
0
+70
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
V
IH
Note 1
VDD/2+0.5
5.5
V
Input Low Voltage, ICLK
V
IL
Note 1
VDD/2-0.5
V
Input High Voltage, OE
V
IH
2
VDD
V
Input Low Voltage, OE
V
IL
0.4
V
Output High Voltage
V
OH
I
OH
= -16 mA
2
V
Output Low Voltage
V
OL
I
OL
= 16 mA
0.5
V
Operating Supply Current
IDD
No load, 135 MHz
25
mA
Short Circuit Current
I
OS
28
mA
L
OW
S
KEW
1
TO
4 C
LOCK
B
UFFER
MDS 553 B
4
Revision 052501
I n t e g r a t e d C i r c u i t S y s t e ms
q
5 2 5 R a c e S t r e e t , S a n J o s e , CA 9 5 1 2 6
q
t e l ( 4 0 8 ) 2 9 5 - 9 8 0 0
q
w w w. ic s t . c o m
ICS553
DC Electrical Characteristics (continued)
VDD=3.3V 5%
, Ambient temperature 0 to +70
C, unless stated otherwise
VDD=5V 5%
, Ambient temperature 0 to +70
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
V
IH
Note 1
VDD/2+0.7
5.5
V
Input Low Voltage, ICLK
V
IL
Note 1
VDD/2-0.7
V
Input High Voltage, OE
V
IH
2
VDD
V
Input Low Voltage, OE
V
IL
0.4
V
Output High Voltage
V
OH
I
OH
= -25 mA
2.4
V
Output Low Voltage
V
OL
I
OL
= 25 mA
0.8
V
Output High Voltage (CMOS
Level)
V
OH
I
OH
= -12 mA
VDD-0.4
V
Operating Supply Current
IDD
No load, 135 MHz
35
mA
Short Circuit Current
I
OS
50
mA
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Operating Voltage
VDD
4.75
5.25
V
Input High Voltage, ICLK
V
IH
Note 1
VDD/2+1
5.5
V
Input Low Voltage, ICLK
V
IL
Note 1
VDD/2-1
V
Input High Voltage, OE
V
IH
2
VDD
V
Input Low Voltage, OE
V
IL
0.4
V
Output High Voltage
V
OH
I
OH
= -45 mA
2.4
V
Output Low Voltage
V
OL
I
OL
= 45 mA
0.8
V
Output High Voltage (CMOS
Level)
V
OH
I
OH
= -12 mA
VDD-0.4
V
Operating Supply Current
IDD
No load, 135 MHz
50
mA
Short Circuit Current
I
OS
80
mA
L
OW
S
KEW
1
TO
4 C
LOCK
B
UFFER
MDS 553 B
5
Revision 052501
I n t e g r a t e d C i r c u i t S y s t e ms
q
5 2 5 R a c e S t r e e t , S a n J o s e , CA 9 5 1 2 6
q
t e l ( 4 0 8 ) 2 9 5 - 9 8 0 0
q
w w w. ic s t . c o m
ICS553
AC Electrical Characteristics
VDD = 2.5V 5%
, Ambient Temperature 0 to +70
C, unless stated otherwise
VDD = 3.3V 5%
, Ambient Temperature 0 to +70
C, unless stated otherwise
VDD = 5V 5%
, Ambient Temperature 0 to +70
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.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Input Frequency
0
200
MHz
Output Rise Time
t
OR
0.8 to 2.0V, C
L
=15pF
1.5
ns
Output Fall Time
t
OF
2.0 to 0.8V, C
L
=15pF
1.5
ns
Propagation Delay
Note 1
3
ns
Output to output skew
Note 2
Rising edges at VDD/2
0
50
ps
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Input Frequency
0
200
MHz
Output Rise Time
t
OR
0.8 to 2.0V, C
L
=15pF
1.0
ns
Output Fall Time
t
OF
2.0 to 0.8V, C
L
=15pF
1.0
ns
Propagation Delay
Note 1
2.6
ns
Output to output skew
Note 2
Rising edges at VDD/2
0
50
ps
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
Input Frequency
0
200
MHz
Output Rise Time
t
OR
0.8 to 2.0V, C
L
=15pF
0.7
ns
Output Fall Time
t
OF
2.0 to 0.8V, C
L
=15pF
0.7
ns
Propagation Delay
Note 1
2.5
ns
Output to output skew
Note 2
Rising edges at VDD/2
0
50
ps
L
OW
S
KEW
1
TO
4 C
LOCK
B
UFFER
MDS 553 B
6
Revision 052501
I n t e g r a t e d C i r c u i t S y s t e ms
q
5 2 5 R a c e S t r e e t , S a n J o s e , CA 9 5 1 2 6
q
t e l ( 4 0 8 ) 2 9 5 - 9 8 0 0
q
w w w. ic s t . c o m
ICS553
Package Outline and Package Dimensions
(8 pin SOIC, 150 Mil. Narrow Body)
Package dimensions are kept current with JEDEC Publication No. 95
Ordering Information
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 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 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
ICS553M
ICS553M
Tubes
8 pin SOIC
0 to +70
C
ICS553MT
ICS553M
Tape and Reel
8 pin SOIC
0 to +70
C
D
E
H
c
h x 4 5
0
b
e
Q
A
P in 1
In d e x
A r e a
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
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
a
0
8
0
8
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