DM74LS123

更新时间： 2024-11-18 05:09:47

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
6页	136K
描述
Dual Retriggerable One-Shot with Clear and Complementary Outputs

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DM74LS123 数据手册

March 1991

DM74LS123 Dual Retriggerable One-Shot

with Clear and Complementary Outputs

Compensated for V

and temperature variations

General Description

Triggerable from CLEAR input

DTL, TTL compatible

The DM74LS123 is a dual retriggerable monostable multivi-

brator capable of generating output pulses from a few nano-

seconds to extremely long duration up to 100% duty cycle.

Each device has three inputs permitting the choice of either

leading edge or trailing edge triggering. Pin (A) is an active-

low transition trigger input and pin (B) is an active-high tran-

sition trigger input. The clear (CLR) input terminates the out-

put pulse at a predetermined time independent of the timing

components. The clear input also serves as a trigger input

when it is pulsed with a low level pulse transition (ß). To

obtain the best trouble free operation from this device

please read the operating rules as well as the NSC one-shot

application notes carefully and observe recommendations.

Input clamp diodes

Functional Description

The basic output pulse width is determined by selection of

an external resistor (R ) and capacitor (C ). Once triggered,

the basic pulse width may be extended by retriggering the

gated active-low transition or active-high transition inputs or

be reduced by use of the active-low or CLEAR input. Retrig-

gering to 100% duty cycle is possible by application of an

input pulse train whose cycle time is shorter than the output

cycle time such that a continuous ‘‘HIGH’’ logic state is

maintained at the ‘‘Q’’ output.

Features

DC triggered from active-high transition or active-low

transition inputs

Retriggerable to 100% duty cycle

Connection Diagram

Function Table

Dual-In-Line Package

Inputs

Outputs

CLEAR

High Logic Level

Low Logic Level

Can Be Either Low or High

Positive Going Transition

Negative Going Transition

A Positive Pulse

A Negative Pulse

TL/F/6386–1

Order Number DM74LS123M or DM74LS123N

See NS Package Number M16A or N16E

1995 National Semiconductor Corporation

TL/F/6386

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

12 3 4 5 6

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与DM74LS123相关器件

型号	品牌	获取价格	描述	数据表
DM74LS123CW	FAIRCHILD	获取价格	Monostable Multivibrator, LS Series, 2-Func, TTL, WAFER
DM74LS123J	TI	获取价格	IC,MONOSTABLE MULTIVIBRATOR,LS-TTL,DIP,16PIN,CERAMIC
DM74LS123J/A+	ETC	获取价格	Monostable Multivibrator
DM74LS123M	NSC	获取价格	Dual Retriggerable One-Shot with Clear and Complementary Outputs
DM74LS123M	FAIRCHILD	获取价格	Dual Retriggerable One-Shot with Clear and Complementary Outputs
DM74LS123MX	FAIRCHILD	获取价格	Monostable Multivibrator
DM74LS123N	TI	获取价格	LS SERIES, DUAL MONOSTABLE MULTIVIBRATOR, PDIP16, PLASTIC, DIP-16
DM74LS123N	NSC	获取价格	Dual Retriggerable One-Shot with Clear and Complementary Outputs
DM74LS123N	FAIRCHILD	获取价格	Dual Retriggerable One-Shot with Clear and Complementary Outputs
DM74LS123N/A+	ETC	获取价格	Monostable Multivibrator

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