IC 7490 Datasheet PDF – Decade and Binary Counters

Part Number : 7490

Function : Decade and Binary Counter

Package : DIP 14 Pin Type

Manufacturers : Fairchild Semiconductor

Pinouts :

7490 Pinout


Description :

The DM7490A monolithic counter contains four master slave flip-flops and additional gating to provide a divide-by two counter and a three-stage binary counter for which the count cycle length is divide-by-five. The counter has a gated zero reset and also has gated set to-nine inputs for use in BCD nine’s complement applications.

To use the maximum count length (decade or four-bit binary), the B input is connected to the QAoutput. The input count pulses are applied to input A and the outputs are as described in the appropriate truth table. A symmetrical divide-by-ten count can be obtained from the counters by connecting the QDoutput to the A input and applying the input count to the B input which gives a divide-by-ten square wave at output QA.

Logic Diagram
IC 7490 Datasheet PDF
Other data sheets within the file : 7490, DM7490A, DM7490AN

IC 7490 Datasheet PDF

IC 7490 Datasheet PDF

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