Texas Instruments 74AVCAH164245ZRDR

Overview

74AVCAH164245ZRDR from Texas Instruments is a 16-bit dual-supply bus transceiver with configurable voltage translation and 3-state outputs, supporting bidirectional level-shifting between 1.4 V and 3.6 V rails (e.g., 1.8 V ↔ 3.3 V), featuring I_off partial-power-down protection, bus-hold on all data inputs, and DOC™ dynamic output control for noise reduction without speed penalty.

For engineers reviewing the 74AVCAH164245ZRDR datasheet, 74AVCAH164245ZRDR pinout, 74AVCAH164245ZRDR application, or 74AVCAH164245ZRDR equivalent, this device is critical for low-voltage mixed-rail system interconnects in FPGA-to-ASIC interfaces, memory expansion buses, and multi-voltage SoC subsystem bridging where rail isolation and signal integrity under dynamic load are design priorities.

Technical Context

The 74AVCAH164245ZRDR implements two independent 8-bit transceiver sections (1A↔1B and 2A↔2B), each with direction-control (DIR) and output-enable (OE) inputs referenced to VCCA. Its fully dual-rail architecture allows simultaneous operation of A-port at 1.4–3.6 V and B-port at 1.4–3.6 V, enabling universal translation across 1.5 V, 1.8 V, 2.5 V, and 3.3 V domains without external biasing.

DOC™ circuitry dynamically modulates output impedance during transitions-initially lowering it for strong drive (±24 mA IOH/IOL at 2.5 V), then raising it to suppress ringing-while bus-hold eliminates external pull resistors and I_off blocks current flow when either VCC is at GND, ensuring safe partial-power-down behavior per JESD78 Class II latch-up spec.

Key Specifications

Pinout & Package

74AVCAH164245ZRDR is packaged in a 48-pin TVSOP (DGV) with 0.4 mm pitch, 16.4 mm reel width, and 1.2 mm max height. The package complies with JEDEC MO-153 and features exposed pad-less construction optimized for automated assembly and thermal performance in space-constrained layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH16T245DGGR and TXB0108PWR, the 74AVCAH164245ZRDR uniquely combines ±24 mA drive, DOC™ noise suppression, bus-hold, and I_off in a 16-bit dual-rail package-making it optimal for high-integrity, mixed-voltage system interconnects requiring deterministic control and robust power sequencing.

Availability

74AVCAH164245ZRDR is available at Aetrix Electronics and suitable for FPGA-to-ASIC interfaces, memory expansion buses, and multi-rail industrial controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for 74AVCAH164245ZRDR 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 decades of expertise in high-reliability interface ICs and widebus technology.

The 74AVCAH164245ZRDR belongs to TI's Widebus™ family, engineered specifically for low-voltage, high-speed bidirectional bus translation in multi-rail digital systems where signal integrity, power sequencing safety, and layout simplicity are critical.

FAQ

What voltage ranges does the 74AVCAH164245ZRDR support on its A and B ports?

The 74AVCAH164245ZRDR supports independent 1.4 V to 3.6 V operation on both VCCA (A port) and VCCB (B port), enabling translation between common logic rails including 1.5 V, 1.8 V, 2.5 V, and 3.3 V. Absolute maximum ratings allow up to 4.6 V applied to any I/O terminal, but sustained operation must remain within the recommended 1.4–3.6 V range per rail to ensure parametric compliance and reliability of the 74AVCAH164245ZRDR.

How does the DOC™ circuitry in the 74AVCAH164245ZRDR improve signal integrity?

The DOC™ (Dynamic Output Control) circuitry in the 74AVCAH164245ZRDR reduces simultaneous switching noise by dynamically lowering output impedance at signal transition onset for strong drive (±24 mA), then raising it mid-transition to damp ringing-without sacrificing propagation delay. This behavior is confirmed in Figure 1 of the 74AVCAH164245ZRDR datasheet and directly enables cleaner edges in high-capacitance, multi-load bus environments.

Can the 74AVCAH164245ZRDR operate safely if one supply rail is powered down?

Yes-the 74AVCAH164245ZRDR includes I_off circuitry that disables outputs and blocks current backflow when either VCCA or VCCB is at GND, satisfying JESD78 Class II latch-up immunity. This feature ensures safe partial-power-down operation in systems with staggered rail sequencing, and is explicitly verified in the 74AVCAH164245ZRDR absolute maximum ratings table and functional description.

Does the 74AVCAH164245ZRDR require external pullup or pulldown resistors on data lines?

No-the 74AVCAH164245ZRDR integrates active bus-hold circuitry on all 16 data inputs (1A1–1A8, 2A1–2A8, 1B1–1B8, 2B1–2B8), which maintains unused or floating inputs at valid logic levels. TI explicitly states that external pullup/pulldown resistors are not recommended when bus-hold is enabled, as confirmed in the 74AVCAH164245ZRDR datasheet's "Features" and "Description" sections.

What is the pin-compatible replacement for the 74AVCAH164245ZRDR in TSSOP packaging?

The SN74AVCAH164245GR is the TSSOP (DGG) variant of the same device, sharing identical logic, pinout, and electrical specifications with the 74AVCAH164245ZRDR (TVSOP/DGV), differing only in package dimensions and thermal resistance (θ_JA = 70°C/W vs. 58°C/W). Both are drop-in replacements for board designs where mechanical fit permits substitution, and both carry the same Widebus™ functionality and 74AVCAH164245ZRDR-equivalent performance.