SN74LS193 Synchronous 4-Bit Up/Down Binary Counter

Description

Key Specifications

Pin Configuration (16-Pin DIP)

Based on standard datasheet pinouts :

Key Features & Operation

• Synchronous Operation: All flip-flops are clocked simultaneously, eliminating output counting spikes found in ripple counters .

• Dual Clock Inputs: Separate clock pins for counting Up (CPU) and Down (CPD). The direction is determined by which clock is pulsed while the other is held HIGH . Important: Never leave both clocks LOW simultaneously.

• Asynchronous Parallel Load (PL): Allows the counter to be preset to any 4-bit value by placing data on P0-P3 and pulsing PL LOW .

• Asynchronous Master Reset (MR): Forces all outputs to LOW (0000) when pulsed HIGH, independent of clocks .

• Cascading: Internal carry (TCU) and borrow (TCD) outputs allow multiple counters to be chained without external logic for multi-digit counting .

Mode Select Table

The operation is determined by the state of MR, PL, CPU, and CPD :

(H = HIGH, L = LOW, X = Don’t Care, ↑ = LOW-to-HIGH transition)