54122 datasheet(1/6 Pages) NSC

Il numero della parte	54122

Spiegazioni elettronici	Retriggerable Resettable Multivibrator

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Produttore elettronici	NSC [National Semiconductor (TI)]

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TLF10212

June 1989

54122DM74122

Retriggerable Resettable Multivibrator

General Description

The ’122 features positive and negative DC level triggering

inputs complementary outputs an optional 10 kX internal

timing resistor and an overriding Direct Clear (CD) input

When the circuit is in the quasi-stable (delay) state another

trigger applied to the inputs (per Truth Table) will cause the

delay period to start again without disturbing the outputs

This process can be repeated indefinitely and thus the out-

put pulse period (Q HIGH Q LOW) can be made as long as

desired Alternatively a delay period can be terminated

by a LOW signal applied to CD which also prevents trigger-

ing An internal connection from CD to the input gate makes

it possible to trigger the circuit by a positive-going signal on

CD as shown in the Truth Table For timing capacitor values

greater than 1000 pF the output pulse width is defined as

follows

tw e 032 RXCX (10 a 07RX)

Where tw is in ns RX is in kX and CX is in pF

Connection Diagram

Dual-In-Line Package

TLF10212 – 1

Order Number 54122DMQB 54122FMQB or DM74122N

See NS Package Number J14A N14A or W14B

Logic Symbol

TLF10212 – 2

VCC e Pin 14

GND e Pin 7

NC e Pins 10 and 12

Pin Names

Description

A1 A2

Trigger Inputs (Active Falling Edge)

B1 B2

Trigger Inputs (Active Rising Edge)

CD

Direct Clear Inputs (Active LOW)

Q Q

Outputs

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A

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