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74LS168 - 54LS168 Synchronous Bi-Directional BCD Decade Counter

General Description

The 54LS168 is a fully synchronous 4-state up down counter featuring a preset capability for programmable operation carry lookahead for easy cascading and a U D input to control the direction of counting It counts in the BCD (8421) sequence and all state changes whether in counting or parallel loadi

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54LS168 Synchronous Bi-Directional BCD Decade Counter June 1989 54LS168 Synchronous Bi-Directional BCD Decade Counter General Description The 54LS168 is a fully synchronous 4-state up down counter featuring a preset capability for programmable operation carry lookahead for easy cascading and a U D input to control the direction of counting It counts in the BCD (8421) sequence and all state changes whether in counting or parallel loading are initiated by the LOW-to-HIGH transition of the clock Connection Diagram Dual-In-Line Package Logic Symbol TL F 10207 – 1 TL F 10207 – 2 Order Number 54LS168DMQB 54LS168FMQB or 54LS168LMQB See NS Package Number E20A J16A or W16A VCC e Pin 16 GND e Pin 8 Pin Names CEP CET CP P0–P3 PE U D Q0–Q3 TC Description Count Enable Parallel Input (Active L