NXP Semiconductors 74HC652DB,118

Overview

74HC652DB,118 from NXP Semiconductors (formerly Philips) is an octal non-inverting bus transceiver/register with independent 3-state control for A↔B bidirectional data flow, featuring dual clock inputs (CPAB/CPBA), dual select inputs (SAB/SBA), and dual output enables (OEAB/OEBA). It operates at VCC = 4.5–6.0 V, delivers 13 ns typical propagation delay (An/Bn to Bn/An), supports 92 MHz max clock frequency, and implements Schmitt-trigger clock inputs for noise immunity - used in synchronous bus arbitration and buffered memory interface circuits.

For engineers reviewing the 74HC652DB,118 datasheet, 74HC652DB,118 pinout, 74HC652DB,118 application, or 74HC652DB,118 equivalent, key selection criteria include real-time vs. registered data path selection, simultaneous A→B and B→A stored-data transfer capability, independent OE/S control per direction, CMOS power efficiency (26 pF CPD), and SO-24 package compatibility with industrial bus timing requirements.

Technical Context

The 74HC652DB,118 integrates eight D-type flip-flops with separate clock and select logic for each bus direction, enabling concurrent storage and multiplexed transmission of A- and B-bus data. Its architecture supports three operational modes: real-time pass-through (SAB/SBA = HIGH), registered transfer (clock-triggered), and isolated hold (dual OE active).

Schmitt-trigger inputs on CPAB and CPBA tolerate slow-rising clock edges, while independent OEAB/OEBA pins provide per-direction 3-state output control without affecting internal register operation. The device is pin-compatible with LSTTL and meets JEDEC Standard No. 7A for logic interoperability.

Key Specifications

Pinout & Package

74HC652DB,118 is housed in a 24-pin SO (Small Outline) plastic package (SOT137A), with 300 mil body width and gull-wing leads suitable for surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal registered bus transceiver applications.

Compared with 74HC652DB,118, the 74HCT652DB,118 offers guaranteed TTL input compatibility at the cost of slightly higher quiescent current, while the SN74LVTH16652DGGR trades register capability for wider voltage range and double data width - making 74HC652DB,118 optimal for registered 5 V bus isolation where timing predictability and storage are mandatory.

Availability

74HC652DB,118 is available at Aetrix Electronics and suitable for microprocessor bus interfaces, memory-mapped I/O expansion, dual-port RAM bridging, and legacy system bus arbitration requiring stable component supply across industrial temperature ranges (−40°C to +125°C).

Supply support for 74HC652DB,118 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

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering logic IC development.

The 74HC652DB,118 belongs to NXP's legacy 74HC logic family - engineered for high-speed, low-power, pin-compatible replacement of LSTTL in industrial control, instrumentation, and computing infrastructure.

FAQ

What is the operating voltage range for the 74HC652DB,118?

The 74HC652DB,118 operates over a supply voltage range of 2.0 V to 6.0 V, with full parametric performance specified at 4.5 V and 6.0 V. This wide VCC range allows integration into mixed-voltage systems and battery-powered applications where supply regulation may vary. The 74HC652DB,118 maintains valid logic thresholds and timing across this range, supporting robust interoperability with both 3.3 V and 5 V logic families when operated within its rated limits.

Does the 74HC652DB,118 support simultaneous A→B and B→A registered data transfer?

Yes, the 74HC652DB,118 uniquely supports concurrent stored-data transfer in both directions - a feature distinguishing it from the 74HC646. When OEAB and OEBA are both LOW and SAB/SBA are configured appropriately, the 74HC652DB,118 can output stored A-bus data onto the B-bus while simultaneously outputting stored B-bus data onto the A-bus, enabling full-duplex registered bus exchange in a single clock cycle.

What package type is used for the 74HC652DB,118?

The 74HC652DB,118 uses a 24-pin Small Outline (SO) plastic package designated SOT137A, with 300 mil body width and gull-wing leads. This surface-mount package is RoHS-compliant, qualified for reflow soldering, and compatible with standard automated PCB assembly processes. Its pinout matches industry-standard 74HC logic SO-24 footprints, ensuring mechanical and layout compatibility across design generations.

How does the 74HC652DB,118 handle clock input noise or slow edges?

The 74HC652DB,118 incorporates Schmitt-trigger circuitry on both CPAB and CPBA clock inputs, providing hysteresis that rejects noise and accommodates slow-rising or slow-falling clock signals. This design eliminates the need for external RC filtering or dedicated clock conditioning, allowing direct connection to microcontroller GPIO pins or other marginal clock sources while maintaining reliable edge detection and register triggering in the 74HC652DB,118.

Is the 74HC652DB,118 pin-compatible with LSTTL devices?

Yes, the 74HC652DB,118 is explicitly designed to be pin-compatible with Low Power Schottky TTL (LSTTL) devices and complies with JEDEC Standard No. 7A. Its pin configuration, electrical drive strength, and AC timing parameters (e.g., 13 ns tPLH at 5 V) ensure direct functional replacement in legacy LSTTL-based systems without PCB modification - a key advantage confirmed in the original Philips datasheet for the 74HC652DB,118.