74LS90

更新时间： 2024-11-19 22:31:03

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	64K
描述
Decade and Binary Counters

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数据手册

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74LS90 数据手册

August 1986

Revised March 2000

DM74LS90

Decade and Binary Counters

General Description

Features

Each of these monolithic counters contains four master-

slave flip-flops and additional gating to provide a divide-by-

two counter and a three-stage binary counter for which the

count cycle length is divide-by-five for the DM74LS90.

■ Typical power dissipation 45 mW

■ Count frequency 42 MHz

All of these counters have a gated zero reset and the

DM74LS90 also has gated set-to-nine inputs for use in

BCD nine’s complement applications.

To use their maximum count length (decade or four bit

binary), the B input is connected to the Q_Aoutput. The

input count pulses are applied to input A and the outputs

are as described in the appropriate truth table. A symmetri-

cal divide-by-ten count can be obtained from the

DM74LS90 counters by connecting the Q_Doutput to the A

input and applying the input count to the B input which

gives a divide-by-ten square wave at output Q_A.

Ordering Code:

Order Number Package Number

Package Description

DM74LS90M

DM74LS90N

M14A

N14A

14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow

14-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

Reset/Count Truth Table

Reset Inputs

Output

R0(1)

R0(2)

R9(1)

R9(2) Q_DQ_CQ_BQ_A

COUNT

DS006381

www.fairchildsemi.com

12 3 4 5 6

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与74LS90相关器件

型号	品牌	获取价格	描述	数据表
74LS90A	NXP	获取价格	Decade Counter, LS Series, Asynchronous, Negative Edge Triggered, 3-Bit, Up Direction, TTL
74LS90DC	FAIRCHILD	获取价格	Decade Counter, Asynchronous, Up Direction, TTL, CDIP14,
74LS90DCQM	FAIRCHILD	获取价格	暂无描述
74LS90DCQM	ROCHESTER	获取价格	Decade Counter,
74LS90DCQR	FAIRCHILD	获取价格	暂无描述
74LS90DCQR	ROCHESTER	获取价格	Decade Counter,
74LS90F	ROCHESTER	获取价格	Decade Counter,
74LS90FC	ROCHESTER	获取价格	Decade Counter,
74LS90FCQR	ROCHESTER	获取价格	Decade Counter,
74LS90N	RAYTHEON	获取价格	Decade Counter, Asynchronous, Up Direction, TTL, PDIP14,