Texas Instruments 74AVCA164245ZQLR

Overview

74AVCA164245ZQLR from Texas Instruments is a 16-bit non-inverting bus transceiver in the AVC (Advanced Very-Low-Voltage CMOS) logic family, designed for high-speed bidirectional data transfer between buses operating at different voltage levels. It supports 1.2 V to 3.6 V supply operation, delivers ±24 mA output drive at 2.5 V, and achieves under-2 ns maximum propagation delay at 2.5 V - enabling use in DDR memory interfaces, FPGA I/O bridging, and high-performance computing backplanes.

For engineers reviewing the 74AVCA164245ZQLR datasheet, 74AVCA164245ZQLR pinout, 74AVCA164245ZQLR application, or 74AVCA164245ZQLR equivalent, key selection criteria include its dynamic output control (DOC™) noise suppression, 3.3 V I/O tolerance, partial power-down capability, and TSSOP-48 package compatibility with space-constrained industrial and telecom PCB layouts.

Technical Context

The 74AVCA164245ZQLR implements dual-supply bidirectional translation using separate V_CCA (A-side) and V_CCB (B-side) rails, allowing independent 1.2 V–3.6 V operation on each port. Its DOC™ circuit dynamically adjusts output impedance during switching to suppress simultaneous switching noise without sacrificing speed.

Direction control is managed via two active-low OE pins (OE_A, OE_B) and one DIR pin, enabling independent 8-bit or unified 16-bit bus control. The device features 3.3 V-tolerant I/Os on both sides and supports partial power-down mode to prevent back-driving when either V_CCA or V_CCB is unpowered.

Key Specifications

Pinout & Package

Package: TSSOP-48 (DGG), 12.5 mm × 6.1 mm × 1.2 mm body, 0.5 mm pitch, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC164245DGGR, the 74AVCA164245ZQLR offers identical functionality in a TSSOP-48 package preferred for legacy assembly lines; versus SN74LVC164245ADGGR, it adds DOC™ noise suppression and full 3.3 V I/O tolerance - eliminating design compromises in high-speed mixed-voltage systems.

Availability

74AVCA164245ZQLR is available at Aetrix Electronics and suitable for DDR memory interfaces, FPGA I/O bridging, telecom backplane links, and high-performance workstation buses requiring stable component supply across extended product lifecycles.

Supply support for 74AVCA164245ZQLR 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 with over 60 years of analog and logic innovation, delivering reliable, high-performance components for industrial, automotive, and communications markets.

The 74AVCA164245ZQLR belongs to TI's AVC logic family, engineered specifically for high-speed, low-noise bidirectional data transfer in mixed-voltage digital systems - targeting DDR, FPGA, and telecom infrastructure applications.

FAQ

What voltage ranges does the 74AVCA164245ZQLR support on its A-side and B-side supplies?

The 74AVCA164245ZQLR supports independent supply voltages from 1.2 V to 3.6 V on both V_CCA (A-side) and V_CCB (B-side). This enables robust level translation between common domains such as 1.8 V ↔ 2.5 V, 1.8 V ↔ 3.3 V, or 2.5 V ↔ 3.3 V without external components. The 74AVCA164245ZQLR maintains full functionality and specified timing across this entire range.

Does the 74AVCA164245ZQLR provide protection against back-powering when one supply rail is unpowered?

Yes, the 74AVCA164245ZQLR includes partial power-down circuitry that automatically isolates the I/Os when either V_CCA or V_CCB is at 0 V. This prevents current back-flow and potential damage to powered subsystems - a critical feature for hot-swap-capable telecom and server applications. The 74AVCA164245ZQLR maintains high-impedance states on both ports under these conditions.

How does Dynamic Output Control (DOC™) in the 74AVCA164245ZQLR improve signal integrity?

DOC™ dynamically adjusts output impedance during signal transitions to suppress simultaneous switching noise (SSN) without degrading edge speed. This results in cleaner waveforms, reduced ground bounce, and improved eye opening at high data rates - eliminating the need for external series resistors or complex PCB termination schemes. The 74AVCA164245ZQLR leverages DOC™ to achieve <2 ns propagation delay while maintaining signal fidelity.

Is the 74AVCA164245ZQLR compatible with 3.3 V logic systems despite its low-voltage supply range?

Yes, all I/O pins of the 74AVCA164245ZQLR are 3.3 V tolerant regardless of the applied V_CCA or V_CCB voltage. This allows direct connection to 3.3 V peripherals, microcontrollers, or FPGAs without level-shifting circuitry - even when the device itself operates at 1.8 V or 2.5 V. The 74AVCA164245ZQLR maintains this tolerance across its full operating temperature range.

What package type is used for the 74AVCA164245ZQLR, and what are its key mechanical attributes?

The 74AVCA164245ZQLR uses a TSSOP-48 (DGG) package: 12.5 mm × 6.1 mm body size, 1.2 mm maximum height, and 0.5 mm lead pitch. It is lead-free, RoHS-compliant, and optimized for standard surface-mount assembly processes. The 74AVCA164245ZQLR's thermal resistance (θ_JA = 68°C/W) supports reliable operation in compact, thermally constrained designs such as line cards and embedded controllers.