Nexperia USA Inc. 74HC73D,652

Overview

74HC73D,652 from Nexperia is a dual negative-edge-triggered JK flip-flop with asynchronous reset, designed for synchronous logic control in digital state machines and clock-domain interfacing. It features two independent flip-flops (FF1 and FF2), each with J/K data inputs, nCP clock, nR reset, and complementary nQ/nQ outputs. Operates across 2.0–6.0 V supply, supports -40 °C to +125 °C ambient, and delivers 32 ns typical propagation delay at 4.5 V.

For engineers reviewing the 74HC73D,652 datasheet, 74HC73D,652 pinout, 74HC73D,652 application, or 74HC73D,652 equivalent, key selection criteria include negative-edge triggering behavior, asynchronous reset timing (18 ns max nR→nQ at 4.5 V), Schmitt-trigger clock input tolerance, and SO14 package compatibility with legacy 74HC logic footprints.

Technical Context

This device implements two independent edge-triggered memory cells with fully synchronous J/K data sampling on HIGH-to-LOW clock transitions and asynchronous active-low reset overriding all clocked behavior. Each flip-flop requires stable J/K inputs one setup time (16 ns min at 4.5 V) before the clock edge.

The Schmitt-trigger clock input enables robust operation with slow-rising/falling edges, while integrated clamp diodes allow safe interfacing to voltages beyond VCC using current-limiting resistors. Input leakage remains below ±1.0 μA over full temperature range, supporting low-power system design.

Key Specifications

Pinout & Package

74HC73D,652 is housed in a plastic small outline package (SO14, SOT108-1) with 14 leads and 3.9 mm body width. The package meets JEDEC MS-012 standards and is compatible with standard SOIC-14 footprint layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual JK flip-flop applications.

Compared with SN74HC73DR, 74HC73D,652 offers extended temperature support critical for automotive and high-reliability industrial use; versus 74HCT73D,653, it trades TTL input compatibility for lower input threshold flexibility in mixed-voltage 3.3 V systems.

Availability

74HC73D,652 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and legacy system upgrades requiring stable component supply with long-term lifecycle assurance.

Supply support for 74HC73D,652 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert specializing in high-performance, high-reliability logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HC73 belongs to Nexperia's industry-standard HC logic family, engineered for robustness in mixed-signal environments with emphasis on noise immunity, wide supply range, and extended temperature operation.

FAQ

What is the minimum pulse width required on the nR (reset) input?

The minimum nR pulse width is 16 ns at VCC = 4.5 V, as specified in the tW parameter for reset input. This ensures reliable asynchronous assertion across the full operating temperature range (-40 °C to +125 °C). Shorter pulses may fail to trigger reset, especially at temperature extremes or higher supply voltages.

Can 74HC73D,652 operate reliably at 2.0 V supply?

Yes - it is fully specified down to 2.0 V, with VIH = 1.5 V min and VOL = 0.5 V max at that voltage. Propagation delay increases to 160 ns typical (nCP→nQ), limiting maximum clock frequency to approximately 6 MHz, but all logic functions remain guaranteed per datasheet.

Is the clock input truly Schmitt-triggered, and how does that affect system design?

Yes - the nCP input incorporates a Schmitt-trigger with hysteresis (~0.3 V at 4.5 V), enabling reliable operation with slow or noisy clock edges. This eliminates need for external RC filtering or dedicated clock conditioners, reducing BOM count and board space in cost-sensitive applications.

How does the 74HC73D,652 handle metastability during asynchronous reset release?

Metastability is not applicable upon nR release because the device has no defined "recovery time" from reset - once nR returns HIGH, the next valid clock edge samples J/K inputs and updates outputs deterministically. No internal synchronizer is needed, as reset exit is combinational relative to the clock domain.