Texas Instruments SN74ALVC164245DGGT

Overview

SN74ALVC164245 from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with independent 2.5-V/3.3-V (VCCA) and 3.3-V/5-V (VCCB) supply rails, enabling bidirectional level shifting between voltage domains. It delivers ±24-mA output drive at 3.3 V, achieves 5.8-ns maximum propagation delay, and supports asynchronous data transfer in mixed-voltage systems such as industrial I/O modules interfacing 3.3-V microcontrollers with 5-V peripherals.

For engineers reviewing the SN74ALVC164245 datasheet, SN74ALVC164245 pinout, SN74ALVC164245 application, or SN74ALVC164245 equivalent, key selection criteria include verified 2.5-V ↔ 3.3-V and 3.3-V ↔ 5-V translation capability, dual 8-bit channel independence, 3-state output control per section, latch-up immunity >250 mA, and TSSOP-48 package compatibility with high-density PCB layouts.

Technical Context

The SN74ALVC164245 implements two independent 8-bit transceiver sections (1A/1B and 2A/2B), each with dedicated direction (DIR) and output-enable (OE) controls referenced to VCCA. Its CMOS input circuitry accepts VIH/VIL levels tied to VCCA, while I/O ports tolerate input voltages up to VCCX + 0.5 V - enabling safe interfacing with higher-voltage drivers without external clamping.

Operation requires simultaneous power sequencing: VCCA must ramp before VCCB, and OE pins must be pulled up to VCCA to ensure high-impedance state during power-up. The device does not include internal level-shifting on control inputs - DIR and OE logic thresholds track VCCA, making it unsuitable for direct 5-V control signaling without external translation.

Key Specifications

Pinout & Package

TSSOP-48 package (12.50 mm × 6.10 mm body size), lead pitch 0.5 mm, exposed pad not present. Pin numbering follows JEDEC MO-153 standard with pin 1 at top-left corner (notch-mark side).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional level-shifting transceiver applications.

Compared with TXB0108PWR and SN74AVC16T245DGGR, the SN74ALVC164245 provides deterministic DIR-controlled bidirectionality and higher drive strength for legacy 2.5-V/5-V mixed systems, while the SN74AVC16T245DGGR offers superior speed and voltage flexibility for modern low-voltage platforms.

Availability

SN74ALVC164245 is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical imaging systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for SN74ALVC164245 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 industrial, automotive, and communications markets.

The SN74ALVC164245 belongs to TI's Widebus™ family of high-speed, low-voltage logic devices designed specifically for robust voltage-domain bridging in multi-rail systems where deterministic timing and high noise immunity are critical.

FAQ

What voltage domains does the SN74ALVC164245 support for level shifting?

The SN74ALVC164245 supports bidirectional translation between 2.5-V and 3.3-V domains (VCCA = 2.5 V, VCCB = 3.3 V), and between 3.3-V and 5-V domains (VCCA = 3.3 V, VCCB = 5 V). It does not support 1.8-V operation. The A-port logic levels track VCCA; the B-port tolerates inputs up to VCCB + 0.5 V. This makes SN74ALVC164245 ideal for bridging legacy 5-V peripherals to modern 3.3-V microcontrollers.

Can the SN74ALVC164245 be used with only one supply voltage?

No - the SN74ALVC164245 requires two independent supplies: VCCA for A-port and control logic, and VCCB for B-port I/O. Both must be within their specified ranges (VCCA = 2.3–3.6 V, VCCB = 3–5.5 V) and powered in sequence (VCCA before VCCB). Using only one supply violates absolute maximum ratings and will damage the device. SN74ALVC164245 is not compatible with single-supply level translators like TXB0108.

How should the OE and DIR pins be connected for reliable operation?

OE and DIR pins must be referenced to VCCA and driven by VCCA-compatible logic. OE should be pulled up to VCCA via a resistor (typically 4.7–10 kΩ) to ensure high-impedance state at power-up. DIR must be actively driven HIGH or LOW - floating DIR causes undefined data flow direction and potential bus contention. Do not tie DIR directly to VCCB; use a level shifter if control logic operates at B-port voltage. This requirement is fundamental to SN74ALVC164245 functionality.

Does the SN74ALVC164245 support hot insertion or live bus swapping?

The SN74ALVC164245 is not rated for hot insertion. Its I/O ports lack power-off protection - applying signals to A/B ports while VCCA or VCCB is unpowered may exceed absolute maximum input voltage ratings (–0.5 V to VCCX + 0.5 V) and cause latch-up. For hot-swap applications, use TI's SN74CBTLV3245A or dedicated hot-swap controllers. SN74ALVC164245 requires strict power sequencing per Section 10 of its datasheet.

What is the maximum data rate supported by the SN74ALVC164245 in a typical PCB layout?

Based on its 5.8-ns maximum propagation delay and 10-ns/V input transition rate limit, the SN74ALVC164245 supports reliable operation up to 100 Mbps in point-to-point configurations with controlled-impedance 50-Ω traces and proper termination. At higher speeds (>150 Mbps), signal integrity degrades due to inter-pair skew and crosstalk - validated using TI's IBIS model SCAS416Q. For DDR or LVDS interfaces, consider SN74AVC16T245DGGR instead of SN74ALVC164245.