NSC CGS74B2525N, CGS74B2525MX, CGS74B2525M Datasheet
TL/F/10907
CGS74B2525 1-to-8 Minimum Skew Clock Driver
September 1995
CGS74B2525
1-to-8 Minimum Skew Clock Driver
General Description
This minimum skew clock driver is designed for Clock Generation and Support (CGS) applications operating well
above 20 MHz (33 MHz, 50 MHz). The device guarantees
minimum output skew across the outputs of a given device
and also from device-to-device. Skew parameters are also
provided as a means to measure duty cycle requirements as
those found in high speed clocking systems. The ’B2525 is
a minimum skew clock driver with one input driving eight
outputs specifically designed for signal generation and clock
distribution applications.
Features
Y
Clock Generation and Support (CGS) DeviceÐIdeal for
high frequency signal generation or clock distribution
applications
Y
CGS74B version features National’s Advanced Bipolar
FAST
É
LSI process
Y
1-to-8 low skew clock distribution
Y
600 ps pin-to-pin output skew
Y
Specifications for device-to-device variation of propagation delay
Y
Specification for transition skew to meet duty cycle
requirements
Y
Center pin VCCand GND configuration to minimize high
speed switching noise
Y
Current sourcing 48 mA and current sinking of 64 mA
Y
Low dynamic power consumption above 20 MHz
Y
Guaranteed 4 kV ESD protection
Logic Symbol
TL/F/10907– 1
Connection Diagram
Pin Assignment
for DIP and SOIC
TL/F/10907– 2
FASTÉand TRI-STATEÉare registered trademarks of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.
Functional Description
Pin Description
Pin Names Description
CLK Clock Input
O
0–O7
Outputs
Truth Table
Inputs Outputs
CLK O0–O
7
LL
HH
TL/F/10907– 5
2
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage (V
CC
) 7.0V
Input Voltage (VI) 7.0V
Operating Free Air Temperature 0
§
Ctoa70§C
Storage Temperature Range
b
65§Ctoa150§C
Junction Temperature (iJA)
Plastic (N) Package 104
§
C/W
JEDEC SOIC (M) Package 120
§
C/W
Recommended Operating
Conditions
Supply Voltage (VCC) 4.5V to 5.5V
Input Rise and Fall Times 9.6 ns max
(0.8V to 2.0V)
Free Air Operating Temperature (T
A
)0
§
Ctoa70§C
Note 1: The Absolute Maximum Ratings are those values beyond which the
safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the DC and AC Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The Recommended Operating Conditions will define the conditions for actual device operation.
DC Electrical Characteristics
over recommended operating conditions unless specified otherwise. All typical values are measured at V
CC
e
5V, T
A
e
25§C.
Symbol Parameter Conditions Min Typ Max Units
V
IK
Input Clamp Voltage V
CC
e
4.5V, I
I
eb
18 mA
b
1.2 V
V
IH
Minimum Input
2.0 V
High Level Voltage
V
IL
Maximum Input
0.8 V
Low Level Voltage
V
OH
High Level Output I
OH
eb
3 mA, V
CC
e
4.5V 2.4
Voltage
I
OH
eb
48 mA, V
CC
e
4.5V 2.0 V
V
OL
Low Level Output V
CC
e
4.5V, I
OL
e
64 mA
0.35 0.5 V
Voltage
I
I
Input Current
@
V
CC
e
5.5V, V
IH
e
7V
0.1 mA
Max Input Voltage
I
IH
High Level Input Current V
CC
e
5.5V, V
IH
e
2.7V 20 mA
I
IL
Low Level Input Current V
CC
e
5.5V, V
IH
e
0.4V
b
0.5 mA
I
O
Output Drive Current V
CC
e
5.5V, V
O
e
2.25V
b
50
b
150 mA
I
CC
Supply Current V
CC
e
5.5V Outputs High 8 15 mA
Outputs Low 32 42 mA
C
IN
Input Capacitance V
CC
e
5V 5 pF
3
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