100328

Low Power Octal ECL/TTL Bi-Directional Translator with

Latch

General Description

The 100328 is an octal latched bi-directional translator de-

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

and vice versa. The direction of this 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. A HIGH on the latch enable input

(LE) latches the data at both inputs even though only one

output is enabled at the time. A LOW on LE makes the

100328 transparent.

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 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 Identical performance to the 100128 at 50% of the

supply current

n Bi-directional translation

n 2000V ESD protection

n Latched outputs

n FAST TTL outputs

n Voltage compensated operating range =

−4.2V to −5.7V

n Available to MIL-STD-883

Logic Symbol

Pin Names

Description

E

ECL Data I/O

T

TTL Data I/O

OE

Output Enable Input

LE

Latch Enable Input

DIR

Direction Control Input

DS100295-1

August 1998

© 1998 National Semiconductor Corporation

DS100295

www.national.com