Texas Instruments 74LVCH16245ADLRG4

Overview

74LVCH16245ADLRG4 from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 1.65–3.6 V buses. It supports mixed-mode signal operation (5.5 V-tolerant inputs at 3.3 V VCC), delivers 4 ns max propagation delay at 3.3 V, and features Ioff for live insertion and partial-power-down protection.

For engineers reviewing the 74LVCH16245ADLRG4 datasheet, 74LVCH16245ADLRG4 pinout, 74LVCH16245ADLRG4 application, or 74LVCH16245ADLRG4 equivalent, this device is selected for high-speed, low-voltage bidirectional bus interfacing in space-constrained industrial and portable systems requiring robust ESD immunity, bus-hold functionality, and seamless 3.3 V/5 V domain bridging.

Technical Context

The 74LVCH16245ADLRG4 implements two independent 8-bit transceiver sections (A↔B), each controlled by dedicated DIR and OE pins. Its CMOS input structure accepts voltages up to 5.5 V regardless of VCC (1.65–3.6 V), enabling true level translation without external biasing.

Active bus-hold circuitry maintains undriven A/B port inputs at valid logic states, eliminating external pull resistors. The Ioff feature disables output leakage when VCC = 0 V, preventing back-drive current during hot-swap or power sequencing.

Key Specifications

Pinout & Package

74LVCH16245ADLRG4 is packaged in a 48-pin SSOP (DL) with 15.88 mm × 7.49 mm body size and 0.635 mm lead pitch. This surface-mount package supports automated assembly and offers thermal resistance RθJA = 70.6 °C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16245ADLR and 74ALVC16245DGG, the 74LVCH16245ADLRG4 uniquely combines 5.5 V input tolerance, active bus-hold, and Ioff in a single SSOP-48 package-enabling safer mixed-voltage interfacing without design compromises.

Availability

74LVCH16245ADLRG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, portable medical data acquisition, automotive infotainment head units, and test equipment digital I/O modules requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for 74LVCH16245ADLRG4 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 50 years of innovation in high-reliability interface ICs.

The 74LVCH16245ADLRG4 belongs to TI's Widebus™ family of advanced CMOS transceivers, engineered specifically for robust, low-voltage bidirectional bus interfacing in industrial, automotive, and portable electronics.

FAQ

What is the maximum clock/data rate supported by the 74LVCH16245ADLRG4?

The 74LVCH16245ADLRG4 has a maximum propagation delay (tpd) of 4 ns at VCC = 3.3 V, enabling reliable operation at data rates exceeding 100 MHz in point-to-point or low-capacitance bus configurations. Actual achievable rate depends on load capacitance, termination, and PCB routing-TI recommends limiting total trace capacitance to ≤30 pF per line for optimal timing margin.

Does the 74LVCH16245ADLRG4 require external pull-up or pull-down resistors on its data lines?

No. The 74LVCH16245ADLRG4 integrates active bus-hold circuitry on all A and B port inputs, which maintains undriven or floating inputs at valid logic states without external resistors. Using external pull components alongside bus-hold is not recommended, as it may cause contention and increased power consumption.

Can the 74LVCH16245ADLRG4 safely interface a 5 V microcontroller with a 3.3 V FPGA?

Yes. The 74LVCH16245ADLRG4 accepts input voltages up to 5.5 V across its full 1.65–3.6 V VCC range, making it ideal for translating signals from 5 V logic to 3.3 V domains. Its outputs swing rail-to-rail within the VCC range, ensuring compatible logic levels for the FPGA inputs.

What is the purpose of the Ioff feature in the 74LVCH16245ADLRG4?

The Ioff feature disables output leakage current when VCC = 0 V, preventing damaging back-current flow through the device during live insertion, partial power-down, or hot-swap operations. This protects both the 74LVCH16245ADLRG4 and connected circuitry in modular or redundant power architectures.

How does the 74LVCH16245ADLRG4 handle unused DIR or OE pins?

All unused control inputs-including 1DIR, 2DIR, 1OE, and 2OE-must be held at a defined logic level (VCC or GND) to ensure predictable operation and prevent excess ICC. TI explicitly warns against leaving these pins floating, as undefined states can cause erratic transceiver behavior or increased quiescent current.