ICST ICS553M Low skew 1 to 4 clock buffer Datasheet

ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER
Description
Features
The ICS553 is a low skew, single input to four output,
clock buffer. Part of ICS’ Clock BlocksTM 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.
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
Q0
Q1
IC LK
Q2
Q3
O utput E nable
1
MDS 553 B
In tegr ated C ir cu it S yst ems
●
5 25 Ra ce Str eet, San Jose, C A 95 126
Revision 052501
●
tel ( 408) 2 95-9 800
●
www. i c s t. c om
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER
Pin Assignment
VDD
Q0
Q1
1
2
3
8
7
6
OE
Q3
Q2
GND
4
5
I CLK
8 Pi n (150 mi l) SOIC
Pin Descriptions
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.
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.
2
MDS 553 B
Int egrat ed C ircuit Syste ms
●
525 R ace S tr eet, San Jose, CA 95126
Revision 052501
●
t el (40 8) 295 -9800
●
w ww. ic s t .c o m
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER
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
Recommended Operation Conditions
Parameter
Min.
Typ.
Max.
Units
0
–
+70
°C
+5.25
V
Ambient Operating Temperature
Power Supply Voltage (measured in respect to GND)
+2.375
DC Electrical Characteristics
VDD=2.5V ±5%, Ambient temperature 0 to +70°C, unless stated otherwise
Parameter
Symbol
Operating Voltage
Conditions
Max.
Units
2.375
2.625
V
VDD/2+0.5
5.5
V
VDD/2-0.5
V
VDD
V
0.4
V
VDD
Input High Voltage, ICLK
VIH
Note 1
Input Low Voltage, ICLK
VIL
Note 1
Input High Voltage, OE
VIH
Input Low Voltage, OE
VIL
Output High Voltage
VOH
IOH = -16 mA
Output Low Voltage
VOL
IOL = 16 mA
Operating Supply Current
IDD
No load, 135 MHz
Short Circuit Current
IOS
Typ.
2
2
V
0.5
●
525 R ace S tr eet, San Jose, CA 95126
V
25
mA
±28
mA
3
MDS 553 B
Int egrat ed C ircuit Syste ms
Min.
Revision 052501
●
t el (40 8) 295 -9800
●
w ww. ic s t .c o m
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER
DC Electrical Characteristics (continued)
VDD=3.3V ±5% , Ambient temperature 0 to +70°C, unless stated otherwise
Parameter
Symbol
Operating Voltage
Conditions
Min.
Max.
Units
3.15
3.45
V
VDD/2+0.7
5.5
V
VDD/2-0.7
V
VDD
V
0.4
V
VDD
Input High Voltage, ICLK
VIH
Note 1
Input Low Voltage, ICLK
VIL
Note 1
Input High Voltage, OE
VIH
Input Low Voltage, OE
VIL
Output High Voltage
VOH
IOH = -25 mA
Output Low Voltage
VOL
IOL = 25 mA
Output High Voltage (CMOS
Level)
VOH
IOH = -12 mA
Operating Supply Current
IDD
No load, 135 MHz
Short Circuit Current
IOS
Typ.
2
2.4
V
0.8
VDD-0.4
V
V
35
mA
±50
mA
VDD=5V ±5% , Ambient temperature 0 to +70°C, unless stated otherwise
Parameter
Symbol
Operating Voltage
Conditions
Min.
Max.
Units
4.75
5.25
V
VDD/2+1
5.5
V
VDD/2-1
V
VDD
V
0.4
V
VDD
Input High Voltage, ICLK
VIH
Note 1
Input Low Voltage, ICLK
VIL
Note 1
Input High Voltage, OE
VIH
Input Low Voltage, OE
VIL
Output High Voltage
VOH
IOH = -45 mA
Output Low Voltage
VOL
IOL = 45 mA
Output High Voltage (CMOS
Level)
VOH
IOH = -12 mA
Operating Supply Current
IDD
No load, 135 MHz
Short Circuit Current
IOS
Typ.
2
2.4
V
0.8
VDD-0.4
V
V
50
mA
±80
mA
Notes: 1. Nominal switching threshold is VDD/2
4
MDS 553 B
Int egrat ed C ircuit Syste ms
●
525 R ace S tr eet, San Jose, CA 95126
Revision 052501
●
t el (40 8) 295 -9800
●
w ww. ic s t .c o m
ICS553
LOW SKEW 1 TO 4 CLOCK BUFFER
AC Electrical Characteristics
VDD = 2.5V ±5%, Ambient Temperature 0 to +70° C, unless stated otherwise
Parameter
Symbol
Conditions
Min.
Input Frequency
Typ.
0
Output Rise Time
tOR
Output Fall Time
tOF
Propagation Delay
Note 1
Output to output skew
Note 2
0.8 to 2.0V, CL=15pF
2.0 to 0.8V, CL=15pF
Max. Units
200
MHz
1.5
ns
1.5
ns
3
Rising edges at VDD/2
ns
0
50
ps
VDD = 3.3V ±5%, Ambient Temperature 0 to +70° C, unless stated otherwise
Parameter
Symbol
Conditions
Min.
Input Frequency
Typ.
0
Output Rise Time
tOR
Output Fall Time
tOF
Propagation Delay
Note 1
Output to output skew
Note 2
0.8 to 2.0V, CL=15pF
2.0 to 0.8V, CL=15pF
Max. Units
200
MHz
1.0
ns
1.0
ns
2.6
Rising edges at VDD/2
ns
0
50
ps
VDD = 5V ±5%, Ambient Temperature 0 to +70° C, unless stated otherwise
Parameter
Symbol
Conditions
Min.
Input Frequency
Typ.
0
Output Rise Time
tOR
Output Fall Time
tOF
Propagation Delay
Note 1
Output to output skew
Note 2
0.8 to 2.0V, CL=15pF
2.0 to 0.8V, CL=15pF
Max. Units
200
MHz
0.7
ns
0.7
ns
2.5
Rising edges at VDD/2
ns
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.
5
MDS 553 B
Int egrat ed C ircuit Syste ms
●
525 R ace S tr eet, San Jose, CA 95126
Revision 052501
●
t el (40 8) 295 -9800
●
w ww. ic s t .c o m
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
In d e x
A re a
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
E
P in 1
H
Inches
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°
h x 450
D
A
Q
c
e
b
Ordering Information
Part / Order Number
Marking
Shipping
packaging
Package
Temperature
ICS553M
ICS553MT
ICS553M
ICS553M
Tubes
Tape and Reel
8 pin SOIC
8 pin SOIC
0 to +70° C
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 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.
6
MDS 553 B
Int egrat ed C ircuit Syste ms
●
525 R ace S tr eet, San Jose, CA 95126
Revision 052501
●
t el (40 8) 295 -9800
●
w ww. ic s t .c o m
Similar pages