74LCX112SJ

Overview

The Fairchild Semiconductor 74LCX112SJ is a low-voltage dual J-K negative edge-triggered flip-flop featuring 5V tolerant inputs. It operates within a supply voltage range of 2.0V to 3.6V and utilizes a 16-lead Small Outline Package (SOP) with EIAJ TYPE II dimensions, specifically 5.3mm wide. The device integrates independent J, K, PRESET, CLEAR, and CLOCK inputs for each flip-flop, providing Q and Q outputs. This component is designed for high-speed applications requiring low power consumption and compatibility with mixed-voltage systems.

Feature Summary

• Dual J-K flip-flops with independent control inputs
• Negative edge-triggered synchronous state changes
• 5V tolerant input structure for mixed-voltage interfacing
• Low voltage operation optimized for reduced power consumption

Applications

• High-speed data storage in low-voltage digital systems
• Interface circuits between 3.3V logic and 5V peripherals
• State machine implementations in portable electronics
• Register files in microcontroller-based designs

Procurement Notes

Verify the specific ordering suffix against current ON Semiconductor or Fairchild documentation to ensure package accuracy. Confirm that the 74LCX112SJ designation corresponds to the 16-lead SOP variant. Cross-reference manufacturer part numbers as nomenclature may vary due to corporate integration updates. Ensure compliance with RoHS standards if required by the application environment.

Selection Notes

Select this component when designing systems requiring dual JK flip-flops with 5V tolerant inputs operating at low voltages. The 74LCX series offers lower power dissipation compared to standard CMOS families. Consider the 16-lead SOP package constraints for PCB layout. Verify timing requirements against system clock speeds to ensure reliable negative edge triggering and setup/hold time compliance.

Part Context

The 74LCX112SJ belongs to the LCX family of low-voltage CMOS logic devices from Fairchild Semiconductor, now part of ON Semiconductor. This family is characterized by high speed and low power consumption. The SJ suffix specifically denotes the 16-lead Small Outline Package (SOP) form factor. It serves as a low-voltage alternative to higher voltage logic families, enabling operation in modern portable and battery-powered devices.

Replacement Considerations

Public confirmed substitute part numbers include 74LCX112SC and 74LCX112PC. These variants offer identical electrical functionality but differ in physical packaging. The SC suffix indicates a 16-lead SOIC package, while the PC suffix denotes a 16-lead PDIP package. Verify mechanical fit and pinout compatibility before substitution.