74AC191

更新时间： 2024-11-22 22:38:55

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		计数器时钟
页数	文件大小	规格书
10页	117K
描述
Up/Down Counter with Preset and Ripple Clock

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数据手册

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74AC191 数据手册

November 1988

Revised November 1999

74AC191

Up/Down Counter with Preset and Ripple Clock

General Description

Features

The AC191 is a reversible modulo 16 binary counter. It fea-

tures synchronous counting and asynchronous presetting.

The preset feature allows the AC191 to be used in pro-

grammable dividers. The Count Enable input, the Terminal

Count output and the Ripple Clock output make possible a

variety of methods of implementing multistage counters. In

the counting modes, state changes are initiated by the ris-

ing edge of the clock.

■ I_CCreduced by 50%

■ High speed—133 MHz typical count frequency

■ Synchronous counting

■ Asynchronous parallel load

■ Cascadable

■ Outputs source/sink 24 mA

Ordering Code:

Order Number Package Number

Package Description

74AC191SC

74AC191SJ

74AC191MTC

74AC191PC

M16A

M16D

MTC16

N16E

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

16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

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

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

Logic Symbols

Connection Diagram

IEEE/IEC

Pin Descriptions

Pin Names

Description

Count Enable Input

Clock Pulse Input

P₀–P₃

Parallel Data Inputs

Asynchronous Parallel Load Input

Up/Down Count Control Input

Flip-Flop Outputs

U /D

Q₀–Q₃

Ripple Clock Output

Terminal Count Output

FACT is a trademark of Fairchild Semiconductor Corporation.

DS009940

www.fairchildsemi.com

12 3 4 5 6 7...10

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