74VHC112N

Overview

The Fairchild Semiconductor 74VHC112N is a dual negative edge-triggered J-K flip-flop featuring complementary outputs. It operates within a supply voltage range of 2.0V to 6.0V and supports clock frequencies up to 110 MHz. The device provides a maximum output current of 8 mA and exhibits a typical propagation delay of 5.4 ns at 5V. It functions reliably across an extended temperature range from -40°C to 85°C and utilizes a 16-pin SOIC package.

Feature Summary

• Dual independent J-K flip-flops with complementary Q and Q-bar outputs
• Negative edge-triggered synchronous state changes initiated by the clock signal
• Asynchronous Direct Set and Clear inputs that override clock signals
• High-speed CMOS technology ensuring low power consumption

Applications

• Parallel-to-serial data conversion circuits
• Frequency division and counting logic
• Shift register construction
• State machine implementation in digital systems

Procurement Notes

Verify the manufacturer marking on the component body to confirm Fairchild Semiconductor origin, as this part number is also produced by other vendors like Texas Instruments. Ensure the suffix 'N' corresponds to the SOIC-16 plastic package rather than DIP or TSSOP variants. Check for RoHS compliance markings if environmental regulations apply to your specific manufacturing process.

Selection Notes

Select this component when a dual J-K flip-flop with complementary outputs is required for high-speed applications. It is suitable for designs operating between 2V and 6V where low power dissipation is critical. Consider alternative packages if surface mount space is limited, or verify pin compatibility if replacing legacy TTL-based designs with modern CMOS equivalents.

Part Context

This device belongs to the 74VHC series of advanced high-speed CMOS logic. It offers performance comparable to low-power Schottky TTL while maintaining standard CMOS power advantages. The VHC series is designed for general-purpose digital applications requiring fast switching speeds and wide voltage operation capabilities.

Replacement Considerations

SN74VHC112DR (Texas Instruments)

FAQ

How do the asynchronous inputs function relative to the clock?

The Direct Set and Clear inputs operate independently of the clock signal. A LOW signal on these inputs forces the respective outputs HIGH or LOW immediately, regardless of the clock state.

What is the trigger mechanism for state changes?

State changes are triggered by the falling edge (negative edge) of the clock input. The J and K inputs must be stable during the specified setup and hold times relative to this transition.