74S113PC

Overview

The National Semiconductor 74S113PC is a dual J-K flip-flop belonging to the 74S (Schottky) logic family. It features two independent negative-edge-triggered flip-flops with complementary outputs and dedicated preset and clear inputs. The device utilizes Schottky clamping diodes to minimize propagation delay and prevent saturation, ensuring high-speed switching performance. Packaged in a standard 14-pin DIP format, it operates within a specified voltage range suitable for TTL-compatible systems.

Feature Summary

• Dual independent J-K flip-flops with negative-edge triggering
• Complementary Q and non-Q outputs for versatile logic interfacing
• Dedicated asynchronous preset and clear control inputs
• Schottky technology implementation for enhanced speed and reduced power dissipation

Applications

• High-speed digital counters and shift registers
• Frequency division circuits
• State machine implementations
• Data storage elements in parallel-to-serial converters

Procurement Notes

Verify the manufacturer origin as National Semiconductor or its successor Texas Instruments, noting that legacy production may be discontinued. Confirm the package type matches the 14-pin DIP specification. Check for RoHS compliance status if required by current regulations, as older S-series parts may not meet modern environmental standards. Ensure the part number suffix 'PC' correctly denotes the plastic DIP variant.

Selection Notes

Select this component when specific high-speed switching characteristics of the Schottky family are required over standard LS series alternatives. Consider the availability of complementary outputs if signal inversion stages need to be minimized in the design. Evaluate the operating temperature range and supply voltage requirements against system constraints before finalizing the choice.

Part Context

The 74S113 is part of the broader 7400-series logic family, specifically the Schottky (S) sub-family known for improved speed-power trade-offs. It serves as a functional equivalent to other dual J-K flip-flops but distinguishes itself through faster propagation delays due to internal Schottky diodes. This component represents a classic discrete logic solution for sequential circuit design prior to the widespread adoption of complex programmable logic devices.

Replacement Considerations

The 74LS112 is a common alternative offering similar functionality but with lower speed and power consumption. The 74HC112 provides CMOS compatibility with higher input impedance. Verify pinout compatibility and electrical characteristics such as drive strength and switching speeds when substituting these variants.