STMicroelectronics 74VCXH32245LBR

Overview

74VCXH32245LBR from STMicroelectronics is a low-voltage CMOS quad 32-bit bus transceiver (3-state) with 3.6V-tolerant I/O, symmetrical ±24mA drive at 3.0–3.6V, 2.5ns max propagation delay, bus hold on all data inputs, and LFBGA96 packaging. It enables bidirectional asynchronous data transfer between voltage-domain-isolated buses in portable computing and FPGA interconnect applications.

For engineers reviewing the 74VCXH32245LBR datasheet, 74VCXH32245LBR pinout, 74VCXH32245LBR application, or 74VCXH32245LBR equivalent, key selection criteria include 1.65–3.6V operating range, direction-controlled 32-bit data flow, 3.6V-tolerant I/O for mixed-voltage interfacing, and integrated bus-hold elimination of external pull resistors.

Technical Context

This device implements four independent 8-bit bidirectional transceivers, each controlled by dedicated DIR and nG signals-enabling per-bank direction and output enable granularity. All 64 I/Os feature bus-hold circuitry and ESD protection exceeding 2kV HBM.

It operates across 1.65V to 3.6V VCC with guaranteed logic thresholds (VIH = 2.0V min at 3.0–3.6V), supports hot insertion via power-down protection on inputs/outputs, and delivers matched high- and low-side output impedance for clean signal integrity in high-speed parallel bus systems.

Key Specifications

Pinout & Package

LFBGA96 package (13.6 × 5.6 mm, 0.8 mm pitch), bottom-terminal ball grid array with exposed thermal pad. Pin assignment follows JEDEC MO-245 standard for 96-ball fine-pitch BGA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH32T245ZRGR and 74LVC32245APAG, the 74VCXH32245LBR uniquely combines 3.6V I/O tolerance, bus-hold, and LFBGA96 miniaturization-making it optimal for space-constrained, mixed-voltage embedded systems requiring zero external biasing.

Availability

74VCXH32245LBR is available at Aetrix Electronics and suitable for mobile SoC interconnect, FPGA-to-ASIC bridging, low-power memory expansion, and embedded test access port designs requiring stable component supply across extended product lifecycles.

Supply support for 74VCXH32245LBR 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, analog ICs, power management, and discrete devices for automotive, industrial, and consumer markets.

The VCXH logic family targets low-voltage, high-speed digital interfacing-specifically engineered for battery-powered and mixed-signal systems demanding voltage-domain bridging without performance compromise.

FAQ

Does the 74VCXH32245LBR support hot-plug operation?

Yes. Its inputs and outputs feature power-down protection that prevents back-driving and latch-up when VCC is unpowered or ramping. This allows safe insertion into live backplanes or hot-swap slots without damaging the device or system, provided I/O voltages remain within absolute maximum ratings (–0.5V to +4.6V).

What is the function of the bus-hold circuitry, and how does it affect system design?

The bus-hold circuit maintains the last-valid logic state on each data input when the driving source is disconnected or floats. With 75µA hold current at 0.8V, it eliminates external 10kΩ pull-up/down resistors-reducing BOM cost, PCB area, and potential signal integrity issues from stub loading in high-speed parallel buses.

Can the 74VCXH32245LBR interface between a 1.8V FPGA and a 3.3V ADC without external level shifters?

Yes. Its 3.6V-tolerant I/O accepts 0–3.6V input signals while operating from a 1.8V VCC supply. When driving the 3.3V ADC, VOH reaches ≥2.2V at 18mA load (per DC specs), satisfying 3.3V VIH minimums. No external translators are needed for this voltage combination.

How does the per-bank DIR and nG control improve system-level timing?

Independent DIR/nG per 8-bit bank enables staggered enable/disable sequencing-e.g., asserting 1G before 2G to pipeline data flow across banks. This reduces peak current demand and avoids simultaneous switching noise (SSN), while skew <0.5ns ensures deterministic timing alignment across all 32 bits during active transfer.