74AC191

74AC191 Up/Down Counter with Preset and Ripple Clock

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74AC191 Up/Down Counter with Preset and Ripple Clock

November 1988 Revised November 1999

74AC191 Up/Down Counter with Preset and Ripple Clock
General Description
The AC191 is a reversible modulo 16 binary counter. It features synchronous counting and asynchronous presetting. The preset feature allows the AC191 to be used in programmable 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 rising edge of the clock.

Features
s ICC reduced by 50% s High speed--133 MHz typical count frequency s Synchronous counting s Asynchronous parallel load s Cascadable s Outputs source/sink 24 mA

Ordering Code:
Order Number 74AC191SC 74AC191SJ 74AC191MTC 74AC191PC Package Number M16A M16D MTC16 N16E Package Description 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 CE CP P0 P3 PL U /D Q0 Q3 RC TC Description Count Enable Input Clock Pulse Input Parallel Data Inputs Asynchronous Parallel Load Input Up/Down Count Control Input Flip-Flop Outputs Ripple Clock Output Terminal Count Output

FACT is a trademark of Fairchild Semiconductor Corporation.

1999 Fairchild Semiconductor Corporation

DS009940

www.fairchildsemi.com