STMicroelectronics 74ALVCH16245T

Overview

74ALVCH16245T from STMicroelectronics is a low-voltage CMOS 16-bit bus transceiver with 3-state outputs, bidirectional data flow controlled by DIR inputs, and 3.6V-tolerant I/Os operating from 1.65V to 3.6V supply. It delivers 3.0 ns max propagation delay at 3.0–3.6V, ±24 mA drive strength at VCC = 3.0V, and integrated bus-hold on all data inputs-enabling direct interface between mixed-voltage busses in memory expansion systems.

For engineers reviewing the 74ALVCH16245T datasheet, 74ALVCH16245T pinout, 74ALVCH16245T application, or 74ALVCH16245T equivalent, key selection criteria include voltage translation capability across 1.65–3.6V rails, symmetrical output drive (|IOH| = IOL), bus-hold elimination of external biasing, and TSSOP-48 package compatibility with legacy 74-series 16245 footprints.

Technical Context

This transceiver implements dual 8-bit bidirectional data paths (A↔B) with independent directional control per port (1DIR/2DIR) and separate 3-state enable inputs (1G/2G), supporting asynchronous two-way communication without clocking. Its C2MOS process enables sub-micron gate geometry and five-layer metal interconnect, delivering high-speed operation while maintaining latch-up immunity >300 mA (JESD17) and ESD robustness (HBM >2 kV).

The device features true 3.6V-tolerant inputs and outputs regardless of VCC level (1.65–3.6V), allowing safe interfacing with higher-voltage logic domains. Bus-hold circuitry actively maintains last-valid logic state on A/B data pins when un-driven, eliminating need for external pull resistors and reducing board space and BOM count.

Key Specifications

Pinout & Package

TSSOP-48 package with 0.5 mm pitch, 12.6 mm × 8.1 mm body size, and exposed thermal pad (per mechanical drawing 7065588C). Pin 1 marked by notch; pin numbering follows standard counter-clockwise convention from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH16245DGGR, the 74ALVCH16245T offers identical performance but differs in manufacturer-specific qualification and traceability; versus 74LVC16245APAG, it provides critical bus-hold functionality and wider voltage-margin drive capability essential for robust mixed-voltage system integration.

Availability

74ALVCH16245T is available at Aetrix Electronics and suitable for memory expansion interfaces, FPGA-to-ASIC bridging, and industrial PLC backplane designs requiring stable component supply across extended temperature ranges and mixed-voltage interoperability.

Supply support for 74ALVCH16245T 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 analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The 74ALVCH series targets low-voltage, high-speed logic applications where power efficiency, voltage translation, and bus integrity are critical - especially in portable, embedded, and multi-rail system architectures.

FAQ

What is the maximum operating frequency supported by the 74ALVCH16245T?

The device does not specify a maximum clock frequency, but its 3.0 ns max propagation delay at VCC = 3.0–3.6V implies reliable operation up to approximately 300 MHz in point-to-point configurations with controlled trace impedance and minimal capacitive loading. Actual usable frequency depends on system-level factors including bus capacitance, termination, and driver strength.

Can the 74ALVCH16245T operate with VCC = 2.5V while interfacing with 3.3V signals?

Yes - all inputs and outputs are rated for 3.6V tolerance regardless of VCC level. At VCC = 2.5V, the device accepts 0–3.6V input voltages and drives outputs to valid logic levels compatible with 3.3V CMOS receivers, making it suitable for bidirectional level translation between 2.5V and 3.3V domains without external components.

Does the bus-hold feature require external configuration or enable signals?

No - bus-hold is fully integrated and always active on all A/B data input pins. It functions automatically whenever an input is left floating, maintaining the last-valid logic state without software control, external resistors, or configuration registers. No enable/disable pin or mode setting is required.

How does the 74ALVCH16245T handle simultaneous enable/disable transitions on 1G and 2G?

Each G input controls its respective 8-bit port independently. When 1G and 2G transition simultaneously, both ports enter or exit 3-state mode concurrently. The device guarantees monotonic output behavior during disable - no glitches or intermediate states occur - and maintains isolation integrity even during asynchronous control signal edges.