74163 IC Synchronous 4-Bit Binary Counter
The IC 74163 is a synchronous 4-bit binary counter that counts from 0000 (0) to 1111 (15). Unlike the 74161, the clear input is synchronous, meaning it resets the counter only on the next active clock edge instead of immediately.
It includes a parallel load (LOAD) input to preset any starting count, and enable inputs (ENP and ENT) to control counting. A terminal count output (TC) indicates when the counter reaches its maximum value (15), allowing cascading for larger counting ranges.
Because all outputs change simultaneously on the clock edge, the 74163 avoids the ripple delays found in asynchronous counters. Its TTL compatibility and high-speed design make it suitable for digital clocks, frequency dividers, event counters, and sequencing circuits.
Pin Configuration (DIP-16)
| Pin | Name | Description |
|---|---|---|
| 1 | CLR | Synchronous Clear (active LOW) |
| 2 | CLK | Clock Input |
| 3 | D | Parallel Data Input (MSB) |
| 4 | C | Parallel Data Input |
| 5 | B | Parallel Data Input |
| 6 | A | Parallel Data Input (LSB) |
| 7 | QA | Output Bit 0 |
| 8 | GND | Ground |
| 9 | QB | Output Bit 1 |
| 10 | QC | Output Bit 2 |
| 11 | QD | Output Bit 3 (MSB) |
| 12 | TC | Terminal Count Output |
| 13 | ENT | Count Enable (T) |
| 14 | ENP | Count Enable (P) |
| 15 | LOAD | Parallel Load (active LOW) |
| 16 | VCC | +5V Power Supply |
Key Features
Synchronous binary counting (0–15)
Synchronous clear and parallel load
Terminal count output for cascading
TTL-compatible input/output levels
High-speed operation
Available in DIP-16 or SOIC-16 packages
Applications
Build binary counters for digital electronics.
Divide clock signals by 16 for timing systems.
Implement frequency counters in measurement devices.
Cascade multiple counters for wider counting ranges.
Use as programmable counters in automation.
Drive pulse generation for timing control.
Create sequence generators in digital controllers.
Apply in multiplexing and scanning systems.
Construct event counters for industrial systems.
Teach synchronous counter concepts in labs.
Specifications Table
| Parameter | Value |
|---|---|
| Logic Family | TTL |
| Function | Synchronous Binary Counter |
| Count Range | 0–15 (mod-16) |
| Inputs | Clock, CLR, LOAD, ENP, ENT |
| Outputs | Q0–Q3, TC |
| Input HIGH Voltage | ≥ 2.0V |
| Input LOW Voltage | ≤ 0.8V |
| Output HIGH Voltage | ≥ 2.4V |
| Output LOW Voltage | ≤ 0.4V |
| Propagation Delay | ~25 ns ‘ |
| Max Clock Frequency | ~35 MHz |
| Supply Voltage (Vcc) | 4.75V to 5.25V |
| Operating Temp | 0°C to 70°C |
| Package Type | DIP-16 / SOIC-16 |
| Number of Pins | 16 |
