74LS163 DIP Fully Synchronous 4-bit Binary Counter
The 74LS163 is a high speed TTL integrated circuit that functions as a fully synchronous 4-bit binary counter. This device is designed for high performance digital systems where every operation, including counting, loading, and clearing, is synchronized to the positive edge of the clock pulse. By ensuring all state changes occur simultaneously with the clock, the 74LS163 eliminates the timing glitches and decoding spikes associated with asynchronous logic.
This IC is fully presettable, allowing any 4-bit binary value to be loaded via the parallel data inputs when the load line is active low. It features a synchronous clear input that resets the counter to zero on the next clock transition, providing a clean and predictable reset cycle. The internal look-ahead carry circuitry and dual enable inputs make it exceptionally easy to cascade multiple 74LS163 units for high speed, multi-bit counting chains and frequency division.
KEY FEATURES
- Fully synchronous operation for counting, loading, and clearing
- Synchronous clear input for precise system reset
- Internal look-ahead carry for high speed cascading
- Fully presettable parallel data inputs for flexible start points
- Low power Schottky technology for high frequency timing
- Standard 16 pin dual in line package
SPECIFICATIONS
- Supply Voltage 4.75V to 5.25V
- Operating Temperature 0 to 70 Celsius
- Logic Type TTL Low Power Schottky
- Maximum Clock Frequency 25MHz
- Typical Power Dissipation 93mW
- High Level Output Current -0.4mA
- Low Level Output Current 8mA
INTERFACES
- CLK Clock input positive edge triggered
- CLR Clear input synchronous active low
- LOAD Parallel load input active low
- ENP Count enable P input
- ENT Count enable T input for carry logic
- A B C D Parallel data inputs
- QA QB QC QD Binary counter outputs
- RCO Ripple carry output
- VCC Positive supply voltage
- GND Ground reference
