100352

Low Power 8-Bit Buffer with Cut-Off Drivers

General Description

The 100352 contains an 8-bit buffer, individual inputs (Dn),

outputs (Qn), and a data output enable pin (OEN). A Q out-

put follows its D input when the OEN pin is LOW. A HIGH on

OEN holds the outputs in a cut-off state. The cut-off state is

designed to be more negative than a normal 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 reduces termination

power and prevents loss of low state noise margin when sev-

eral loads share the bus.

The 100352 outputs are designed to drive a doubly termi-

nated 50

Ω transmission line (25Ω load impedance). All in-

puts have 50 k

Ω pull-down resistors.

Features

n Cut-off drivers

n Drives 25

Ω load

n Low power operation

n 2000V ESD protection

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

n Available to industrial grade temperature range

n Available to MIL-STD-883

Logic Symbol

Pin Names

Description

D

Data Inputs

OEN

Output Enable Input

Q

Data Outputs

NC

No Connect

DS100296-1

August 1998

© 1998 National Semiconductor Corporation

DS100296

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