74197 Asynchronous 4-Bit Binary Counter IC (DIP)

74197 Asynchronous 4-Bit Binary Counter IC (DIP)

The 74197 is a high-speed, low-power 4-bit asynchronous (ripple) binary counter built in TTL technology. Designed to count binary values from 0 to 15 (0000 to 1111) and automatically roll over, it is ideal for frequency division, timing, sequencing and event-counting applications in digital systems. Packaged in a standard 14-pin Dual Inline Package (DIP), the 74197 is breadboard- and PCB-friendly for prototyping and production.

Key Features

• Asynchronous 4-bit binary counter (counts 0 to 15)
• Ripple-type counter with binary outputs Q0 to Q3
• TTL logic family compatibility (VCC 4.75V to 5.25V)
• High-speed operation with typical propagation delay around 25 ns
• Low power consumption compared to older families
• Clear (reset) and preset inputs for setting or clearing the count
• Simple cascading for multi-stage counters and larger bit widths
• Standard 14-pin DIP package for easy implementation

Typical Applications

• Frequency division circuits (clock division)
• Digital clocks and timers
• Event and pulse counting systems
• Sequential logic and state sequencing
• Frequency measurement and control
• Binary number generation and counters in microcontroller peripherals
• Cascaded multi-bit counting systems for wider ranges

Specifications

• Type: Asynchronous 4-bit binary counter
• Logic family: TTL
• Supply voltage (VCC): 4.75V to 5.25V
• Maximum count: 15 (4-bit binary output)
• Input logic level High: >= 2.0V
• Input logic level Low: <= 0.8V
• Typical propagation delay: 25 ns
• Operating temperature range: 0 C to +70 C
• Package type: 14-pin DIP

Design and Usage Tips

• For synchronous timing-critical designs consider using synchronous counters; the 74197 is asynchronous, so ripple propagation introduces cumulative delay across stages.
• Use proper decoupling capacitors (0.1 uF) close to the VCC and GND pins to minimize noise and ensure stable operation.
• When cascading multiple 74197 devices, use the appropriate carry or ripple outputs and add buffering if high fan-out or long traces are present.
• Use the preset and clear inputs to initialize or force specific counts at power-up or during testing.

Why Choose the 74197?

The 74197 4-bit asynchronous binary counter provides a reliable, easy-to-use solution for common digital counting needs. Its TTL compatibility and standard 14-pin DIP package make it a versatile choice for hobbyists, educators and engineers who need straightforward binary counting, frequency division and cascaded counting solutions.

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