|Category||Logic => Counters|
|Description||4-Bit Binary Up/down Counter, Package: Soic, Pins=16|
|Datasheet||Download SN74LS193D datasheet
|Cross ref.||Similar parts: SN74LS191NSR, SN74LS193NSR, SN74LS192D, SN74HC191, SN74HC193, CD74HCT191, SN74ALS169B, SN74ALS191A, SN74ALS193A, SN74LS169B|
|PRESETTABLE BCD/DECADE UP/DOWN COUNTER PRESETTABLE 4-BIT BINARY UP/DOWN COUNTER
The is an UP/DOWN BCD Decade (8421) Counter and the is an UP/DOWN MODULO-16 Binary 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 stages 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.PRESETTABLE BCD / DECADE UP/ DOWN COUNTER PRESETTABLE 4-BIT BINARY UP/ DOWN COUNTER
Low Power. 95 mW Typical Dissipation High Speed. 40 MHz Typical Count Frequency Synchronous Counting Asynchronous Master Reset and Parallel Load Individual Preset Inputs Cascading Circuitry Internally Provided Input Clamp Diodes Limit High Speed Termination EffectsNOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package.
LOADING (Note a) HIGH LOW 0.25 U.L. 0.25 U.L. 0.25 U.L. 0.25 U.L. 0.25 U.L. 5 (2.5) U.L. 5 (2.5) U.L. 5 (2.5) U.L. 5 4 CPU CPD P2 P3 TCU TCD
Count Up Clock Pulse Input Count Down Clock Pulse Input Asynchronous Master Reset (Clear) Input Asynchronous Parallel Load (Active LOW) Input Parallel Data Inputs Flip-Flop Outputs (Note b) Terminal Count Down (Borrow) Output (Note b) Terminal Count Up (Carry) Output (Note b)0.5 U.L. 0.5 U.L. 0.5 U.L. 0.5 U.L. 0.5 U.L. 10 U.L. 10 U.L. 10 U.L.
NOTES: a. 1 TTL Unit Load (U.L.) HIGH/1.6 mA LOW. b. The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74) b. Temperature Ranges.STATE DIAGRAMS LS192 LOGIC EQUATIONS FOR TERMINAL COUNT
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