54LS191 - Motorola

54LS191 PRESETTABLE BCD/DECADE UP/DOWN COUNTERS

The LS190 is a synchronous Up / Down BCD Decade Counter and the LS191 is a synchronous Up / Down 4-Bit Binary Counter. The operating modes of the LS190 decade counter and the LS191 binary counter are identical, with the only difference being the count sequences as noted in the state diagrams. Each circuit contains four master / slave flip-flops, with interna.

Features

ency
• Synchronous Counting
• Asynchronous Parallel Load
• Individual Preset Inputs
• Count Enable and Up/ Down Control Inputs
• Cascadable
• Input Clamp Diodes Limit High Speed Termination Effects CONNECTION DIAGRAM DIP (TOP VIEW) VCC 16 P0 15 CP 14 RC 13 TC 12 PL 11 P2 10 P3 9 NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package. 1 P1 2 Q1 3 Q0 4 CE 5 U/D 6 Q2 7 Q3 8 GND PIN NAMES LOADING (Note a) HIGH LOW CE Count Enable (Active LOW) Input 1.5 U.L. 0.7 U.L. CP Clock Pulse (Active HIGH going edge) Input 0.5 U.L. 0.25 U.L. .