100329

Low Power Octal ECL/TTL Bidirectional Translator with

Register

General Description

The 100329 is an octal registered bidirectional translator de-

signed to convert TTL logic levels to 100K ECL logic levels

and vice versa. The direction of the translation is determined

by the DIR input. A LOW on the output enable input (OE)

holds the ECL outputs in a cut-off state and the TTL outputs

at a high impedance level. The outputs change synchro-

nously with the rising edge of the clock input (CP) even

though only one output is enabled at the time.

The cut-off state is designed to be more negative than a nor-

mal ECL LOW level. This allows the output emitter-followers

to turn off when the termination supply is −2.0V, presenting a

high impedance to the data bus. This high impedance re-

duces the termination power and prevents loss of low state

noise margin when several loads share the bus.

turing optimal DC drive and capable of quickly charging and

discharging highly capacitive loads. All inputs have 50 k

Ω

pull-down resistors.

Features

n Bidirectional translation

n ECL high impedance outputs

n Registered outputs

n FAST TTL outputs

n Voltage compensated operating range = −4.2V to −5.7V

n Standard Microcircuit Drawing

(SMD) 5962-9206601

Connection Diagrams

24-Pin DIP

DS100306-2

24-Pin Quad Cerpack

DS100306-4

September 1999

© 1999 National Semiconductor Corporation

DS100306

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