74AC191SCX ,Up/Down Counter with Preset and Ripple ClockFunctional DescriptionThe AC191 is a synchronous up/down counter. The AC191 ripple through to the l ..
74AC191SJ ,Up/Down Counter with Preset and Ripple ClockFeaturesThe AC191 is a reversible modulo 16 binary counter. It fea-
74AC191SCX-74AC191SJ-74AC191SJX
Up/Down Counter with Preset and Ripple Clock
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 Features The AC191 is a reversible modulo 16 binary counter. It fea-I reduced by 50% CC tures synchronous counting and asynchronous presetting. High speed—133 MHz typical count frequency The preset feature allows the AC191 to be used in pro- Synchronous counting grammable dividers. The Count Enable input, the Terminal Asynchronous parallel load Count output and the Ripple Clock output make possible a variety of methods of implementing multistage counters. InCascadable the counting modes, state changes are initiated by the ris- Outputs source/sink 24 mA ing edge of the clock. Ordering Code: Order Number Package Number Package Description 74AC191SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow Body 74AC191SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 74AC191MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide 74AC191PC N16E 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 CE CP Clock Pulse Input P –P Parallel Data Inputs 0 3 PL Asynchronous Parallel Load Input U /D Up/Down Count Control Input Q –Q Flip-Flop Outputs 0 3 Ripple Clock Output RC TC Terminal Count Output FACT is a trademark of . © 1999 DS009940
