74LS193 Datasheet PDF – 4-Bit Up/Down Binary Counter

Part Number : 74LS193

Function : Synchronous 4-Bit Up/Down Binary Counters with Dual Clock

Package : DIP 16 Pin

Manufacturers : National Semiconductor ( Texas Instruments )

Pinouts :

74LS193 datasheet


Description :

This circuit is a synchronous up/down 4-bit binary counter. Synchronous operation is provided by having all flip-flops clocked simultaneously, so that the outputs change together when so instructed by the steering logic. This mode of operation eliminates the output counting spikes normally as sociated with asynchronous (ripple-clock) counters.

The outputs of the four master-slave flip-flops are triggered by a low-to-high level transition of either count (clock) input. The direction of counting is determined by which count input is pulsed while the other count input is held high.


1. Fully independent clear input
2. Synchronous operation
3. Cascading circuitry provided internally
4. Individual preset each flip-flop

Logic Diagram

Acquired by Texas Instruments on September 23rd, 2011.

Other data sheets within the file : 54LS193, 54LS193DMQB, 54LS193FMQB, 54LS193J, 54LS193LMQB

74LS193 Datasheet PDF Download

74LS193 pdf