54121DMQB datasheet(1/6 Pages) NSC

Part #	54121DMQB

Description	One-Shot with Clear and Complementary Outputs

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Manufacturer	NSC [National Semiconductor (TI)]

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TLF6538

June 1989

54121DM54121DM74121 One-Shot with

Clear and Complementary Outputs

General Description

The DM5474121 is a monostable multivibrator featuring

both positive and negative edge triggering with complemen-

tary outputs An internal 2kX timing resistor is provided for

design convenience minimizing component count and lay-

out problems This device can be used with a single external

capacitor Inputs (A) are active-low trigger transition inputs

and input (B) is an active-high transition Schmitt-trigger in-

put that allows jitter-free triggering from inputs with tran-

sition rates as slow as 1 voltsecond A high immunity to

VCC noise of typically 15V is also provided by internal cir-

cuitry at the input stage

To obtain optimum and trouble free operation please read

operating rules and NSC one-shot application notes careful-

ly and observe recommendations

Features

Y

Triggered from active-high transition or active-low tran-

sition inputs

Y

Variable pulse width from 30 ns to 28 seconds

Y

Jitter free Schmitt-trigger input

Y

Excellent noise immunity typically 12V

Y

Stable pulse width up to 90% duty cycle

Y

TTL DTL compatible

Y

Compensated for VCC and temperature variations

Y

Input clamp diodes

Y

Alternate MilitaryAerospace device (54121) is avail-

able Contact a National Semiconductor Sales Office

Distributor for specifications

Functional Description

The basic output pulse width is determined by selection of

an internal resistor RINT or an external resistor (RX) and

capacitor (CX) Once triggered the output pulse width is in-

dependent of further transitions of the inputs and is a func-

tion of the timing components Pulse width can vary from a

few nano-seconds to 28 seconds by choosing appropriate

RX and CX combinations There are three trigger inputs from

the device two negative edge-triggering (A) inputs one pos-

itive edge Schmitt-triggering (B) input

Connection Diagram

Dual-In-Line Package

TLF6538 – 1

Order Number 54121DMQB 54121FMQB

DM54121J DM54121W or DM74121N

See NS Package Number J14A N14A or W14B

Function Table

Inputs

Outputs

A1

A2

B

Q

LX

H

L

H

XL

H

L

H

XX

L

H

HH

X

L

H

v

H

v

HH

vv

H

LX

u

XL

u

H

e

High Logic Level

L

e

Low Logic Level

X

e

Can Be Either Low or High

u e Positive Going Transition

v e Negative Going Transition

e

A Positive Pulse

e

A Negative Pulse

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A

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54121DMQB Datasheet(PDF) 1 Page - National Semiconductor (TI)

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