100370F datasheet(1/8 Pages) NSC

Part #	100370F

Description	Low Power Universal Demultiplexer/Decoder

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100370

Low Power Universal Demultiplexer/Decoder

General Description

The 100370 universal demultiplexer/decoder functions as ei-

ther a dual 1-of-4 decoder or as a single 1-of-8 decoder, de-

pending on the signal applied to the Mode Control (M) input.

In the dual mode, each half has a pair of active-LOW Enable

(E) inputs. Pin assignments for the E inputs are such that in

the 1-of-8 mode they can easily be tied together in pairs to

provide two active-LOW enables (E

1a to E1b,E2a to E2b).

Signals applied to auxiliary inputs H

a,Hb and Hc determine

whether the outputs are active HIGH or active LOW. In the

dual 1-of-4 mode the Address inputs are A

0a,A1a and A0b,

A

1b with A2a unused (i.e., left open, tied to VEE or with LOW

signal applied). In the 1-of-8 mode, the Address inputs are

A

0a,A1a,A2a with A0b and A1b LOW or open. All inputs have

50 k

Ω pulldown resistors.

Features

n 35% power reduction of the 100170

n 2000V ESD protection

n Pin/function compatible with 100170

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

Logic Symbols

Pin Names

Description

A

na,Anb

Address Inputs

E

na,Enb

Enable Inputs

M

Mode Control Input

H

a

Z

0–Z3 (Z0a–Z3a)

Polarity Select Input

H

b

Z

4–Z7 (Z0b–Z3b)

Polarity Select Input

H

c

Common Polarity

Select Input

Z

0–Z7

Single 1-of-8

Data Outputs

Z

na,Znb

Dual 1-of-4

Data Outputs

Single 1-of 8 Application

DS100311-1

Dual 1-of-4 Application

DS100311-4

August 1998

DS100311

www.national.com

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