Part Number : 74LS193
Function : Synchronous 4-Bit Up/Down Binary Counters with Dual Clock
Package : DIP, SOIC, Flat 16 Pin Type
Maker : National , Texas Instruments
Pinouts : 
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.
Logic Diagram
Features
1. Fully independent clear input
2. Synchronous operation
3. Cascading circuitry provided internally
4. Individual preset each flip-flop
Acquired by Texas Instruments on September 23rd, 2011.
Datasheet PDF Download : 
Others datasheet of same file :
54LS193, 54LS193DMQB, 54LS193FMQB, 54LS193J,
54LS193LMQB, 74193
