SN74193 4-Bit Binary Up/Down Counter IC – TTL Digital Logic Chip

The SN74193 (74193) is a TTL 4-bit synchronous binary up/down counter IC designed for digital counting applications. It can count in both increasing and decreasing binary sequences using separate Count Up and Count Down clock inputs.

The IC provides four binary outputs representing a 4-bit count from 0 to 15 (0000 to 1111). It also features parallel data loading, reset functionality, and carry/borrow outputs, allowing multiple counters to be cascaded for applications requiring more than 4 bits.

The SN74193 is ideal for digital counters, frequency division, timers, control circuits, educational electronics, and digital logic experiments.

Key Features

• 4-bit synchronous binary counter
• Up and down counting
• Binary counting range: 0 to 15
• Separate Count Up and Count Down clock inputs
• 4-bit parallel data inputs
• 4-bit binary outputs
• Parallel load capability
• Master reset / clear function
• Carry output for cascading counters
• Borrow output for cascading counters
• TTL digital logic
• Can be cascaded for larger counting ranges
• Suitable for breadboard prototyping

How It Works

The SN74193 operates as a 4-bit binary counter, producing four output bits representing the current count.

The output sequence when counting upward is:

0000 → 0001 → 0010 → 0011 → ... → 1111

This corresponds to decimal values:

0 → 1 → 2 → 3 → ... → 15

When configured to count down, the sequence is reversed:

1111 → 1110 → 1101 → ... → 0000

Up/Down Counting

The SN74193 provides separate clock inputs for controlling the counting direction.

Count Up

Pulses applied to the Count Up (CPU) input increase the binary count.

For example:

5 → 6 → 7 → 8 → 9

Count Down

Pulses applied to the Count Down (CPD) input decrease the binary count.

For example:

9 → 8 → 7 → 6 → 5

This makes the IC suitable for applications where the value must be increased or decreased electronically.

4-Bit Parallel Load

The SN74193 includes four parallel data inputs, allowing a specific 4-bit binary value to be loaded directly into the counter.

Instead of always starting from zero, the counter can be preset to a desired binary value.

For example:

1010 = Decimal 10

This feature is useful for programmable counters, preset timers, and digital control circuits.

Carry & Borrow Outputs

The IC provides dedicated Carry and Borrow outputs for cascading multiple SN74193 counters.

Carry Output

Used when counting upward beyond the maximum 4-bit value.

Borrow Output

Used when counting downward below the minimum value.

By connecting multiple SN74193 ICs together, larger binary counters can be created.

For example:

• 1 × SN74193 → 4-bit counter
• 2 × SN74193 → 8-bit counter
• 4 × SN74193 → 16-bit counter

Reset Function

The reset/clear input allows the counter outputs to be returned to:

0000

This provides a convenient way to restart the counting sequence.

Applications

The SN74193 can be used for:

• Binary counters
• Up/down counters
• Digital counting systems
• Frequency division
• Digital timers
• Event counters
• Position counters
• Control circuits
• Digital displays
• Clock pulse counting
• Sequential logic circuits
• Microprocessor interfacing
• Educational electronics
• Breadboard experiments
• TTL logic projects

Technical Specifications

Part Number: SN74193 / 74193
Function: 4-Bit Binary Up/Down Counter
Counter Type: Synchronous Binary
Counting Direction: Up / Down
Counting Range: 0–15
Number of Bits: 4
Parallel Inputs: 4
Binary Outputs: 4
Clock Inputs: Separate Up and Down
Parallel Load: Yes
Reset/Clear: Yes
Carry Output: Yes
Borrow Output: Yes
Logic Family: TTL
Typical Supply Voltage: 5V
Package: DIP
Application: Digital Counting & Sequential Logic

Ideal for Learning

The SN74193 is an excellent IC for learning and experimenting with:

• Binary counting
• Up/down counting
• Synchronous counters
• Flip-flops
• Sequential logic
• Clock signals
• Carry and borrow operations
• Cascaded counters
• Parallel data loading
• Digital circuit design

The SN74193 4-Bit Binary Up/Down Counter IC is a versatile component for students, hobbyists, and engineers working with digital counting and sequential logic circuits.