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.
The 100329 is designed with FAST
®
TTL output buffers, fea-
turing optimal DC drive and capable of quickly charging and
discharging highly capacitive loads. All inputs have 50 kΩ
pull-down resistors.
Features
n Bidirectional translation
n ECL high impedance outputs
n Registered outputs
n FAST TTL outputs
n TRI-STATE
®
outputs
n Voltage compensated operating range = −4.2V to −5.7V
n Standard Microcircuit Drawing
(SMD) 5962-9206601
Connection Diagrams
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
FAST
®
is a registered trademark of Fairchild Semiconductor.
24-Pin DIP
DS100306-2
24-Pin Quad Cerpack
DS100306-4
September 1999
100329
Low
Power
Octal
ECL/TTL
Bidirectional
T
ranslator
with
Register
© 1999 National Semiconductor Corporation DS100306 www.national.com