The GD74LS393 is a dual 4-bit binary counter. It contains two independent 4-bit binary counters in a single package. Each counter consists of four master-slave flip-flops and a gating network that provides divide-by-two and divide-by-eight counting functions. Each counter has an independent clock (CLK) input and an asynchronous master reset (MR) input. When the MR input is high, all four flip-flops in the counter are reset to a low logic level. The counters count up on the negative-going transition of the clock input.

Applications

• Frequency division
• Timing circuits
• Digital clocks
• Event counters
• Address generation for memory systems

Features

• Dual 4-bit binary counters in a single package
• Independent clock and reset inputs for each counter
• Asynchronous master reset
• Low-Power Schottky TTL circuitry
• Counts up on negative-going clock transition

Benefits

• Reduces component count in digital systems
• Provides a convenient way to implement multiple counting functions
• Simplifies the design of timing and frequency division circuits
• Offers good speed performance and low power consumption
• Easy to interface with other TTL devices

Additional Details

The GD74LS393 typically comes in a 14-pin DIP (Dual In-line Package). The pinout includes the clock input, master reset input, and four output pins (QA, QB, QC, and QD) for each counter. It is essential to consult the datasheet for specific electrical characteristics, timing diagrams, and pinout information. The operating temperature range is typically 0°C to 70°C.

The 'LS' designation indicates that the device utilizes Schottky diodes to prevent saturation of the transistors, which improves switching speed. The GD74LS393 provides a compact and efficient solution for various digital applications requiring counting, frequency division, or timing functions. The independent counters allow for flexible configuration and control of different counting operations within a single device. The asynchronous master reset allows for immediate clearing of the counter, independent of the clock signal.