74LS169 Synchronous 4-Bit Up Down Binary Counter IC 74LS169-PDIP-16

Product Overview

The 169 is a fully synchronous 4-stage up/down binary counter. It features a preset capability for programmable operations, carry look-ahead circuitry for easy cascading, and a U/D input to control the counting direction. All state changes—whether counting or parallel loading—are initiated by the LOW-to-HIGH transition of the clock signal.

Core Specifications

• Operating Voltage: Nominally 5.0V.

• Counting Modes: Fully synchronous bidirectional (up/down) modulo-16 binary counting.

• Internal Circuitry: Includes internal carry look-ahead for high-speed cascading.

Features

• Fully Synchronous Operation: All flip-flops are clocked simultaneously, which eliminates the output counting spikes associated with asynchronous (ripple-clock) counters.

• Programmable: Features a preset capability that allows outputs to be aligned with parallel data inputs when the Parallel Enable (PE) input is LOW.

• Cascading: Integrated carry look-ahead and a Terminal Count (TC) output allow for multi-stage (n-bit) cascading without the need for additional external logic.

• Directional Control: The U/D input determines the direction of the count (increment or decrement).

Applications

• High-Speed Counting: Designed for applications requiring fast, reliable, synchronous counting.

• Programmable Designs: Ideal for circuits where specific counting modes (load, hold, or count) must be dynamically controlled by an external system.

• Multi-Stage Cascading: Used in n-bit counting systems where the TC output pulse enables successive stages.