Details, datasheet, quote on part number: SN74LS193D
CategoryLogic => Counters
Description4-Bit Binary Up/down Counter, Package: Soic, Pins=16
CompanyON Semiconductor
DatasheetDownload SN74LS193D datasheet
Cross ref.Similar parts: SN74LS191NSR, SN74LS193NSR, SN74LS192D, SN74HC191, SN74HC193, CD74HCT191, SN74ALS169B, SN74ALS191A, SN74ALS193A, SN74LS169B
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Features, Applications

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.


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 Effects

NOTE: 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.



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