DM74LS390

更新时间： 2024-09-29 23:00:43

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		计数器
页数	文件大小	规格书
6页	61K
描述
Dual 4-Bit Decade Counter

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数据手册

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DM74LS390 数据手册

August 1986

Revised March 2000

DM74LS390

Dual 4-Bit Decade Counter

General Description

Each of these monolithic circuits contains eight master-

Features

■ Dual version of the popular DM74LS90

slave flip-flops and additional gating to implement two indi-

■ DM74LS390...individual clocks for A and B flip-flops

provide dual ÷ 2 and ÷ 5 counters

vidual four-bit counters in

a single package. The

DM74LS390 incorporates dual divide-by-two and divide-

by-five counters, which can be used to implement cycle

lengths equal to any whole and/or cumulative multiples of 2

and/or 5 up to divide-by-100. When connected as a bi-qui-

nary counter, the separate divide-by-two circuit can be

used to provide symmetry (a square wave) at the final out-

put stage. The DM74LS390 has parallel outputs from each

counter stage so that any submultiple of the input count fre-

quency is available for system-timing signals.

■ Direct clear for each 4-bit counter

■ Dual 4-bit version can significantly improve system den-

sities by reducing counter package count by 50%

■ Typical maximum count frequency...35 MHz

■ Buffered outputs reduce possibility of collector commu-

tation

Ordering Code:

Order Number Package Number

Package Description

DM74LS390M

DM74LS390N

M16A

N16E

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagram

DS006433

www.fairchildsemi.com

12 3 4 5 6

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与DM74LS390相关器件

型号	品牌	获取价格	描述	数据表
DM74LS390M	FAIRCHILD	获取价格	Dual 4-Bit Decade Counter
DM74LS390MX	FAIRCHILD	获取价格	Asynchronous Up Counter
DM74LS390N	FAIRCHILD	获取价格	Dual 4-Bit Decade Counter
DM74LS390N/A+	ETC	获取价格	Asynchronous Up Counter
DM74LS390N/B+	ETC	获取价格	Asynchronous Up Counter
DM74LS393	FAIRCHILD	获取价格	Dual 4-Bit Binary Counter
DM74LS393M	FAIRCHILD	获取价格	Dual 4-Bit Binary Counter
DM74LS393MX	FAIRCHILD	获取价格	Asynchronous Up/Down Counter
DM74LS393N	ETC	获取价格	Asynchronous Up/Down Counter
DM74LS393N/A+	ETC	获取价格	Asynchronous Up/Down Counter