onsemi 74LCX652WM

Overview

74LCX652WM from ON Semiconductor is an octal bus transceiver/register IC with dual 8-bit bidirectional data paths, D-type flip-flop registers on both A and B buses, 5V-tolerant I/O, and operation at 2.3V–3.6V V_CC. It supports real-time and registered data transfer between buses in mixed-voltage systems such as 3.3V logic interfacing to legacy 5V peripherals.

For engineers reviewing the 74LCX652WM datasheet, pinout, applications, or equivalent options, key selection criteria include 5V-tolerant I/O compatibility, sub-10 ns propagation delay at 3.3V, ±24 mA drive strength, live-insertion support, and register-controlled bus isolation for synchronous data staging in industrial control backplanes.

Technical Context

The 74LCX652WM implements two independent 8-bit D-type register banks (A and B), each clocked by dedicated CPAB/CPBA inputs, with select (SAB/SBA) and output-enable (OEAB/OEBA) controls enabling four distinct bus management modes: real-time A↔B transfer, stored-A-to-B, stored-B-to-A, and simultaneous dual-register storage. Its architecture allows concurrent input latching and output gating without internal contention.

All I/Os are 5V tolerant across the full 2.3V–3.6V V_CC range, with guaranteed VIH/VIL thresholds and rail-to-rail VOH/VOL performance under ±24 mA loads. The device uses advanced CMOS process technology to achieve 150 MHz maximum clock frequency while maintaining <10 µA quiescent ICC and integrated EMI/noise suppression circuitry.

Key Specifications

Pinout & Package

74LCX652WM is housed in a 24-lead SOIC package (JEDEC MS-013, 0.300" wide, Package Number M24B), with 1.27 mm pitch and standard gull-wing leads suitable for reflow soldering.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal transceiver/register applications.

Compared with 74LCX652WM, the 74ALVC162245 offers faster raw speed but lacks register staging and true 5V I/O tolerance, while the SN74LVC8T245 provides compact 8-bit translation but omits the dual-clock, bidirectional register control essential for synchronous bus bridging.

Availability

74LCX652WM is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system upgrade bridges, and programmable logic I/O expansion requiring stable component supply and long-term obsolescence mitigation.

Supply support for 74LCX652WM 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

ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, logic, and custom silicon solutions for automotive, industrial, cloud, and consumer markets.

The 74LCX652WM belongs to the LCX low-voltage logic family, designed specifically for mixed-signal systems requiring robust 5V-tolerant interfacing, high-speed registered data transfer, and low-power operation in space-constrained industrial and communications equipment.

FAQ

What is the maximum clock frequency supported by the 74LCX652WM?

The 74LCX652WM supports a maximum clock frequency of 150 MHz under recommended operating conditions (V_CC = 3.3V ± 0.3V, T_A = −40°C to +85°C, C_L = 50 pF). This rating applies to CPAB and CPBA inputs and is validated across the full industrial temperature range. The 74LCX652WM achieves this performance while maintaining sub-10 ns propagation delay and low dynamic power consumption.

Does the 74LCX652WM support live insertion in powered backplane systems?

Yes, the 74LCX652WM supports live insertion and withdrawal per Note 1 in its datasheet. Its power-down high-impedance inputs/outputs and controlled leakage current (<10 µA) ensure safe hot-plug operation. To guarantee high-impedance state during power transitions, OEAB and OEBA must be tied to V_CC via pull-up resistors - a requirement explicitly defined for the 74LCX652WM in its functional description.

Can the 74LCX652WM drive standard TTL loads directly?

Yes, the 74LCX652WM can drive standard TTL loads directly due to its ±24 mA output drive capability at V_CC = 3.0V and guaranteed VOH/VOL levels across the 2.3V–3.6V supply range. Its 5V-tolerant outputs maintain valid logic levels even when interfacing with 5V TTL inputs, eliminating the need for external buffer stages in most industrial backplane and control applications involving the 74LCX652WM.

What are the key differences between the 74LCX652WM and the 74LCX652MSA?

The 74LCX652WM and 74LCX652MSA share identical electrical specifications and logic functionality but differ exclusively in package: the 74LCX652WM uses a 24-lead SOIC (M24B, 0.300" wide), while the 74LCX652MSA uses a 24-lead SSOP (MSA24, 5.3 mm wide). Both are pin-compatible and functionally interchangeable; the choice depends on PCB layout constraints, thermal requirements, and assembly process compatibility - not electrical performance of the 74LCX652WM itself.

Is the 74LCX652WM suitable for use in medical devices?

No, the 74LCX652WM is not authorized for use in life support systems or FDA Class 3 medical devices. ON Semiconductor explicitly states that its products, including the 74LCX652WM, are not designed, intended, or authorized for implantable or critical life-support applications. Designers must verify compliance with IEC 62304 and other applicable standards independently, as the 74LCX652WM carries no medical-grade qualification or assurance.