74193 4-Bit Up/Down Binary Counter (74HC193)

Description

74193 IC 4-Bit Binary Up/Down Counter The IC 74193 is a synchronous 4-bit binary up/down counter capable of counting from 0000 (0) to 1111 (15) in both up and down directions. It includes two separate clock inputs: CPU (Clock Pulse Up) for incrementing and CPD (Clock Pulse Down) for decrementing. It provides an asynchronous clear (CLR) that immediately resets the counter to zero regardless of the clock and a parallel load (LOAD) that presets any 4-bit value into the counter. The device has carry (TCU) and borrow (TCD) outputs, allowing cascading multiple counters to build larger counting ranges. The synchronous operation ensures that all outputs update simultaneously with the clock edge, avoiding glitches. It is widely used in digital systems requiring bidirectional counting, frequency division, event counting, and programmable timing sequences. Pin Configuration (DIP-16) Pin Name Description 1 B0 Parallel Data Input (LSB) 2 B1 Parallel Data Input 3 B2 Parallel Data Input 4 B3 Parallel Data Input (MSB) 5 CPU Clock Pulse Up Input 6 CPD Clock Pulse Down Input 7 TCD Terminal Count Down (Borrow) Output 8 GND Ground 9 TCU Terminal Count Up (Carry) Output 10 Q0 Output Bit 0 (LSB) 11 Q1 Output Bit 1 12 Q2 Output Bit 2 13 Q3 Output Bit 3 (MSB) 14 LOAD Parallel Load (active LOW) 15 CLR Asynchronous Clear (active LOW) 16 VCC +5V Power Supply Key Features Synchronous 4-bit up/down binary counting (0–15) Asynchronous clear for immediate reset Parallel load for presetting values Separate