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CGS64 74B2529 500 ps 2 to 10 Minimum Skew Clock Driver

September 1995

CGS64 74B2529

500 ps 2 to 10 Minimum Skew Clock Driver

General Description

This minimum skew clock driver is designed for Clock Gen-

eration and Support (CGS) applications operating from

33 MHz to 80 MHz The devices guarantee minimum output

skew across the outputs of a given device

Skew parameters are also provided as a means to measure

duty cycle requirements as those found in high speed clock-

ing systems The 鈥?529 is a minimum skew clock driver with

two selectable inputs driving ten outputs

The SEL pin is used to determine which CLKn will have an

active effect on the outputs of the circuit When SEL

e

1

the CLK1 input is selected and when SEL

e

0 the CLK0

input is selected The non-selected CLKn input will not have

any effect on the logical output level of the circuit The out-

put pins act as a single entity and will follow the state of the

CLK inputs

Features

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Clock Generation and Support (CGS) devices

Ideal for high frequency signal generation or clock

distribution applications

CGS74B version features National鈥檚 Advanced Bipolar

FAST LSI process

2-to-10 low skew clock distribution

500 ps pin-to-pin output skew (V package)

Specification for transition skew to meet duty cycle

requirements

20-center pin V

CC

and GND configuration or PLCC to

minimize high speed switching noise

Current sourcing 48 mA and current sinking of 64 mA

Low dynamic power consumption above 20 MHz

Guaranteed 4 kV ESD protection

Logic Symbols

Connection Diagrams

Pin Assignment

SOIC

TL F 11923鈥?

Pin Descriptlon

Pin

Names

CLK0 CLK1

O0鈥揙9

SEL

Description

Clock Input

Outputs

Clock Select

TL F 11923 鈥?2

TL F 11923 鈥?3

Pin Assignment

for PLCC

Inputs

CLK0

L

H

X

X

CLK1

X

X

L

H

SEL

L

L

H

H

Outputs

O0鈥揙9

L

H

L

H

L

e

Low Logic Level

H

e

High Logic Level

X

e

Immaterial

FAST is a registered trademark of National Semiconductor Corporation

C

1996 National Semiconductor Corporation

TL F 11923 鈥?4

RRD-B30M106 Printed in U S A

TL F 11923

http

www national com

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