Datasheet > 54LS168

54LS168

更新时间： 2024-09-22 22:45:31

品牌	Logo	应用领域
美国国家半导体 - NSC		计数器
页数	文件大小	规格书
6页	133K
描述
54LS168 Synchronous Bi-Directional BCD Decade Counter

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数据手册

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54LS168 数据手册

June 1989

54LS168 Synchronous Bi-Directional

BCD Decade Counter

General Description

The 54LS168 is a fully synchronous 4-state up/down coun-

ter featuring a preset capability for programmable operation,

carry lookahead for easy cascading and a U/D input to con-

trol the direction of counting. It counts in the BCD (8421)

sequence and all state changes, whether in counting or par-

allel loading, are initiated by the LOW-to-HIGH transition of

the clock.

Connection Diagram

Logic Symbol

Dual-In-Line Package

TL/F/10207–1

TL/F/10207–2

Order Number 54LS168DMQB,

54LS168FMQB or 54LS168LMQB

See NS Package Number

Pin 16

GND

Pin 8

E20A, J16A or W16A

Pin Names

Description

CEP

CET

Count Enable Parallel Input (Active LOW)

Count Enable Trickle Input (Active LOW)

Clock Pulse Input (Active Rising Edge)

Parallel Data Inputs

P0–P3

Parallel Enable Input (Active LOW)

Up-Down Count Control Input

Flip-Flop Outputs

U/D

Q0–Q3

Terminal Count Output (Active LOW)

1995 National Semiconductor Corporation

TL/F/10207

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

12 3 4 5 6

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与54LS168相关器件

型号	品牌	获取价格	描述	数据表
54LS168A/BEBJC	MOTOROLA	获取价格	Decade Counter, Synchronous, Bidirectional, TTL, CDIP16
54LS168DM	FAIRCHILD	获取价格	Decade Counter, Synchronous, Bidirectional, TTL, CDIP16,
54LS168DMQB	NSC	获取价格	54LS168 Synchronous Bi-Directional BCD Decade Counter
54LS168FM	FAIRCHILD	获取价格	Decade Counter, Synchronous, Bidirectional, TTL, CDFP16,
54LS168FMQB	NSC	获取价格	54LS168 Synchronous Bi-Directional BCD Decade Counter
54LS168L1MQB	FAIRCHILD	获取价格	Decade Counter, Synchronous, Bidirectional, TTL, CQCC20,
54LS168LMQB	NSC	获取价格	54LS168 Synchronous Bi-Directional BCD Decade Counter
54LS169	NSC	获取价格	Synchronous 4-Bit Up/Down Binary Counter
54LS169/B2AJC	MOTOROLA	获取价格	LS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, CQCC20, CERAMIC
54LS169/BEAJC	MOTOROLA	获取价格	LS SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL BINARY COUNTER, CDIP16, CERDIP-