74HCT109D,653

Overview

The Nexperia 74HCT109D,653 is a dual positive-edge-triggered JK flip-flop with set and reset capabilities. It operates within a supply voltage range of 4.5 V to 5.5 V. The device features individual J and K inputs, clock (CP) inputs, asynchronous active-low set (SD) and reset (RD) inputs, and complementary Q and Q outputs. It utilizes Schmitt-trigger action on the clock input for tolerance to slow rise/fall times. Packaged in SO-16, it supports -40 °C to +125 °C operation.

Feature Summary

• Dual positive-edge-triggered JK flip-flops with independent set and reset functions
• Asynchronous active-low set and reset inputs operating independently of the clock
• Schmitt-trigger clock input provides high tolerance to slow signal transitions
• TTL-compatible input levels allow direct interfacing with standard logic families

Applications

• Data storage and register circuits requiring parallel load or shift operations
• Frequency division and counter circuits utilizing toggle mode configurations
• State machine implementations requiring reliable edge-triggered state changes
• Digital systems needing robust clock signal conditioning via Schmitt triggers

Procurement Notes

Verify the specific ordering code suffix matches the required package variant. Confirm that the intended application environment remains within the specified temperature range limits. Ensure power supply stability stays within the defined voltage boundaries during operation. Check for any recent product change notifications regarding marking or assembly updates.

Selection Notes

Select this component when TTL-level compatibility is required alongside CMOS noise immunity. Consider the dual configuration for space-constrained designs needing two independent flip-flops. Evaluate the Schmitt-trigger benefit if the system clock signals exhibit significant ringing or slow edges compared to standard HC series alternatives.

Part Context

This part belongs to the 74HCT logic family, designed to bridge CMOS technology with TTL standards. It complements other HCT devices like buffers and gates within digital system architectures. The series emphasizes low power dissipation while maintaining high noise immunity suitable for industrial environments.

Replacement Considerations

Public confirmed substitute part numbers: 74HC109D,653.