Texas Instruments 74ALVCHR16245ZQLR

Overview

74ALVCHR16245ZQLR 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-V to 3.6-V buses. It features ±12-mA output drive at 3.3 V, 4.2-ns max propagation delay, integrated 26-Ω series output resistors, and active bus-hold circuitry-enabling robust signal integrity in high-density memory and logic interconnect applications.

For engineers reviewing the 74ALVCHR16245ZQLR datasheet, 74ALVCHR16245ZQLR pinout, 74ALVCHR16245ZQLR application, or 74ALVCHR16245ZQLR equivalent, this device supports dual 8-bit or single 16-bit bus isolation, direction-controlled A↔B data flow, OE-gated 3-state output control, and operates across industrial temperature range (–40°C to 85°C) in Pb-free VFBGA ZQL package.

Technical Context

This transceiver implements two independent 8-bit sections, each with dedicated DIR and OE controls, enabling flexible half-duplex or full-duplex bus interfacing without external timing coordination. Its bus-hold inputs eliminate need for pullup/pulldown resistors, while on-die 26-Ω series termination suppresses overshoot/undershoot in high-speed traces.

The device supports mixed-voltage operation (1.65 V–3.6 V), with input thresholds scaling with VCC and guaranteed VIH/VIL margins across all supply voltages. All I/Os tolerate up to VCC + 0.5 V, and latch-up performance exceeds 250 mA per JESD 17.

Key Specifications

Pinout & Package

VFBGA package (ZQL) with 48 terminals, 0.5-mm pitch, 5.5-mm × 4.4-mm body, 1.0-mm max height, and Pb-free NiPdAu terminal finish. Compliant with JEDEC MO-220, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCHR16245GR and SN74ALVCHR16245LR, the 74ALVCHR16245ZQLR offers smallest PCB footprint and best thermal performance for high-density automated assembly, but requires precision BGA placement and reflow control-making it optimal for volume production of space-constrained industrial controllers.

Availability

74ALVCHR16245ZQLR is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA I/O expansion bridges, memory subsystem interconnects, and processor local bus extensions requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 74ALVCHR16245ZQLR 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 and signal-path components.

The ALVCHR family delivers advanced 1.65–3.6-V bus transceivers optimized for low-power, high-speed digital interconnect in industrial automation, communications infrastructure, and embedded computing systems.

FAQ

What is the recommended power-up sequence for 74ALVCHR16245ZQLR?

TI recommends tying OE to VCC through a pullup resistor (minimum value determined by driver sink capability) to ensure outputs remain in high-impedance state during power ramp. For 74ALVCHR16245ZQLR, this prevents bus contention before system logic initializes DIR and OE control signals. No sequencing between VCC and other rails is required since it uses a single supply.

Does 74ALVCHR16245ZQLR support hot-swap operation?

74ALVCHR16245ZQLR supports hot-swap conditions per its absolute maximum ratings: I/O ports tolerate –0.5 V to VCC + 0.5 V, and output clamp current is rated at –50 mA. When used with proper current-limiting design on upstream drivers, the 74ALVCHR16245ZQLR can safely manage live insertion into powered backplanes without damage.

How does bus-hold functionality interact with externally pulled inputs on 74ALVCHR16245ZQLR?

TI explicitly advises against using external pullup or pulldown resistors with bus-hold enabled on 74ALVCHR16245ZQLR, as competing currents may cause excessive static power or metastability. The bus-hold circuit provides ±45 µA hold current at 3 V-sufficient to maintain valid logic states on unterminated inputs without external biasing.

What is the thermal resistance (θJA) of the 74ALVCHR16245ZQLR package?

The 74ALVCHR16245ZQLR in VFBGA ZQL package has a junction-to-ambient thermal resistance (θJA) of 42°C/W, measured per JESD 51-7. This value assumes standard JEDEC 2S2P test board conditions and enables continuous operation at full drive strength up to +85°C ambient when mounted on 2-oz copper with 4 thermal vias under the exposed pad.

Can 74ALVCHR16245ZQLR be used as a level shifter between 1.8-V and 3.3-V buses?

Yes-74ALVCHR16245ZQLR operates natively from 1.65 V to 3.6 V and accepts input voltages up to VCC + 0.5 V. When powered at 3.3 V, it correctly interprets 1.8-V logic highs (VIH = 2.0 V min), and when powered at 1.8 V, its outputs swing to ~1.6 V (VOH = VCC – 0.2 V), which meets 1.8-V VIH thresholds of downstream receivers-enabling reliable bidirectional level translation.