Texas Instruments 74ALVCH16245ZRDR

Overview

74ALVCH16245ZRDR from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between two 16-bit buses operating at 1.65 V to 3.6 V. It features ±24-mA output drive at 3.3 V, 3 ns max propagation delay, bus-hold on all data inputs, and 5.5-V tolerant inputs for down-translation (e.g., 5 V → 3.3 V). It is used in server backplanes and telecom infrastructure where level-shifting and high-drive bus isolation are required.

For engineers reviewing the 74ALVCH16245ZRDR datasheet, 74ALVCH16245ZRDR pinout, 74ALVCH16245ZRDR application, or 74ALVCH16245ZRDR equivalent, this page delivers verified electrical parameters, validated BGA MicroStar Junior (54-ball) package mapping, functional mode truth table, real-world use cases in LED displays and I/O expanders, and two confirmed alternative parts with documented technical and application differences.

Technical Context

The 74ALVCH16245ZRDR implements dual independent 8-bit transceivers, each controlled by dedicated DIR and OE inputs. Direction control is synchronous and noninverting: when DIR = HIGH, data flows A→B; when DIR = LOW, data flows B→A. Output enable is active-low: OE = LOW enables outputs; OE = HIGH forces both A- and B-port outputs into high-impedance state.

Its bus-hold circuitry actively maintains valid logic levels on undriven A- and B-port I/O pins without external resistors, reducing board space and system cost. Input tolerance up to 5.5 V at any valid VCC enables robust voltage translation across mixed-supply domains, while ±24-mA drive supports longer PCB traces and heavier capacitive loads.

Key Specifications

Pinout & Package

BGA MicroStar Junior (54-ball) package, 4.50 mm × 7.00 mm body size, 0.5-mm ball pitch, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16245ADGGR and SN74AVC16245DGGR, the 74ALVCH16245ZRDR uniquely combines 5.5-V tolerance, integrated bus-hold, and industrial temperature range in a single BGA package - making it irreplaceable in mixed-voltage, high-reliability, or space-constrained applications where floating inputs or level translation cannot be externally managed.

Availability

74ALVCH16245ZRDR is available at Aetrix Electronics and suitable for server backplane interfacing, LED display row driving, I/O expansion for industrial PLCs, and telecom line card data isolation requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for 74ALVCH16245ZRDR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in logic, power management, and signal chain technologies.

The 74ALVCH16245ZRDR belongs to TI's Widebus™ family - engineered specifically for high-speed, low-voltage, bidirectional bus interfacing in computing, communications, and industrial systems where signal integrity, voltage translation, and layout efficiency are critical.

FAQ

What is the function of the DIR and OE pins on the 74ALVCH16245ZRDR?

The 74ALVCH16245ZRDR uses two DIR pins (1DIR and 2DIR) to set data direction per channel: HIGH enables A→B flow, LOW enables B→A flow. Two OE pins (1OE and 2OE) independently enable or disable outputs - LOW activates the associated port pair, HIGH places both A and B I/Os in high-impedance state. This allows precise, per-channel bus arbitration without contention.

Does the 74ALVCH16245ZRDR require external pullup resistors on its DIR and OE inputs?

Yes - OE must be tied to VCC via a pullup resistor to ensure high-impedance state during power-up/power-down; TI specifies minimum resistance based on driver sink capability. DIR does not require pullup if actively driven, but floating DIR is prohibited due to undefined direction behavior. Bus-hold applies only to A/B I/O pins, not control inputs.

Can the 74ALVCH16245ZRDR translate 5 V signals to a 1.8 V bus?

Yes - the 74ALVCH16245ZRDR accepts input voltages up to 5.5 V regardless of VCC, enabling reliable down-translation from 5 V peripherals to 1.8 V, 2.5 V, or 3.3 V buses. Its output swing remains rail-to-rail within the VCC range, so a 1.8 V-powered 74ALVCH16245ZRDR drives 1.8 V logic levels while safely receiving 5 V inputs.

What is the thermal performance of the 74ALVCH16245ZRDR in its ZRD package?

The 74ALVCH16245ZRDR in the 54-ball BGA MicroStar Junior (ZRD) package has a junction-to-ambient thermal resistance (RθJA) of 36 °C/W under standard JEDEC test conditions. With four VCC and six GND balls, it achieves lower thermal impedance than TSSOP/TVSOP variants, supporting sustained ±24-mA output loading at 85 °C ambient without derating.

How does bus-hold on the 74ALVCH16245ZRDR eliminate external resistors?

The 74ALVCH16245ZRDR integrates active bus-hold circuitry on all 32 A/B I/O pins, providing ±75 µA holding current to maintain last-valid logic state when inputs float. This replaces 32 discrete pullup/pulldown resistors, reducing BOM cost, PCB area, and potential signal distortion from resistor parasitics - confirmed in TI's SCES015M datasheet Section 8.3.