74LS90 Decade / Binary Counter – DIP-14

The 7490 is a TTL logic integrated circuit designed as an asynchronous decade and binary counter. It consists of internally connected flip-flop stages arranged to provide divide-by-2 and divide-by-5 counting sections, allowing flexible configuration for mod-10 (decade) and binary counting operations. The 7490 is widely used for frequency division, event counting, timing generation, and digital clock systems. Operating on a standard 5V TTL supply, it offers reliable counting performance for digital logic and educational applications.

Features

- Asynchronous decade and binary counter

- Internal divide-by-2 and divide-by-5 stages

- Supports mod-10 and custom counting sequences

- Four binary output stages

- Standard TTL logic compatibility

- Single 5V supply operation

- High-speed counting capability

- External reset inputs for flexible count control

- Suitable for frequency division applications

- Useful for digital timing systems

- DIP-14 through-hole package

- Breadboard-friendly design

- Reliable TTL operation

- Easy PCB integration

Specifications

- Model: 7490

- Device Type: Asynchronous Decade and Binary Counter IC

- Logic Family: TTL

- Counting Modes: Mod-10 (Decade), Binary

- Internal Counter Stages: Divide-by-2 and Divide-by-5

- Clock Inputs: 2 (Separate clock sections)

- Output Bits: 4

- Supply Voltage: 5V

- Maximum Clock Frequency: 42MHz

- Propagation Delay (Typical): 25ns

- Power Consumption (Typical): 50mW

- Package Type: 14-Pin DIP

- Mounting Type: Through-Hole

- Operating Temperature Range: 0°C to +70°C

- Application Type: Counting and Frequency Division

Links

- 3D Model

- Datasheet

Tutorials

Decade counter IC 7490 | LAB | V H Mankar