DM74LS192 Datasheet | National Semiconductor

Description The ’LS192 is an up down BCD decade (8421) counter Separate Count Up and Count Down Clocks are used and in either counting mode the circuits operate synchronously The outputs change state synchronous with the LOW-to HIGH transitions on the clock inputs Separate Terminal Count Up and Terminal Count Down outputs are provided which are used as the clocks for a subsequent stage without extra logic thus simplifying multistage counter designs Individual preset inputs allow the circuits to be used as programmable counters Both the Parallel Load (PL) and the Master Reset (MR) inputs asynchronously override the clocks Connection Diagram Dual-In-Line Package Logic Symbol TL F 10178 - 2 VCC e Pin 16 GND e Pin 8 TL F 10178 - 1 Order Number 54LS192DMQB 54LS192FMQB 54LS192LMQB DM74LS192M or DM74LS192N See NS Package Number E20A J16A M16A N16E or W16A Pin Names CPU CPD MR PL P0 - P3 Q0 - Q3 TCD TCU Description Count Up Clock Input (Active Rising Edge) Count Down Clock Input (Active Rising Edge) Asynchronous Master Reset Input (Active HIGH) Asynchronous Parallel Load Input (Active LOW) Parallel Data Inputs Flip-Flop Outputs Terminal Count Down (Borrow) Output (Active LOW) Terminal Count Up (Carry) Output (Active LOW) MR H L L L L PL X L H H H Mode Select Table CPU X X H L H CPD X X H H L Mode Reset (Asyn ) Preset (Asyn ) No Change Count Up Count Down H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial C1995 National Semiconductor Corporation TL F 10178 RRD-B30M105 Printed in U S A Absolute Maximum Ratings (Note) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range b 55 C to a 125 C 54LS DM74LS 0 C to a 70 C Storage Temperature Range b 65 C to a 150 C Note The ‘‘Absolute Maximum Ratings’’ are those values beyond which the safety of the device cannot be guaranteed The device...