Datasheet > DM54122

DM54122

更新时间： 2024-11-14 22:54:35

品牌	Logo	应用领域
美国国家半导体 - NSC		振荡器
页数	文件大小	规格书
6页	128K
描述
Retriggerable Resettable Multivibrator

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数据手册

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DM54122 数据手册

June 1989

54122/DM74122

Retriggerable Resettable Multivibrator

General Description

The ’122 features positive and negative DC level triggering

by a LOW signal applied to C , which also prevents trigger-

inputs, complementary outputs, an optional 10 kX internal

timing resistor and an overriding Direct Clear (C ) input.

ing. An internal connection from C to the input gate makes

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

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

C , as shown in the Truth Table. For timing capacitor values

greater than 1000 pF, the output pulse width is defined as

follows:

0.7/R )

0.32 R C (1.0

Where t is in ns, R is in kX and C is in pF.

Connection Diagram

Logic Symbol

Dual-In-Line Package

TL/F/10212–2

Pin 14

GND

Pin 7

Pins 10 and 12

TL/F/10212–1

Order Number 54122DMQB, 54122FMQB or DM74122N

See NS Package Number J14A, N14A or W14B

Pin Names

Description

A , A

Trigger Inputs (Active Falling Edge)

Trigger Inputs (Active Rising Edge)

Direct Clear Inputs (Active LOW)

Outputs

B , B

Q, Q

1995 National Semiconductor Corporation

TL/F/10212

RRD-B30M105/Printed in U. S. A.

12 3 4 5 6

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