Texas Instruments SN74ALVC164245DL

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 max 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 (Section 1: pins 1–24; Section 2: pins 25–48), each with dedicated direction (DIR) and output-enable (OE) controls powered by VCCA. Control logic operates exclusively from VCCA, while A-port I/Os reference VCCA and B-port I/Os reference VCCB-enabling true dual-supply translation without external level-shifters.

Each port's input circuitry remains active regardless of OE state, requiring externally applied logic HIGH/LOW to prevent excess ICC and ICCZ. The device supports four functional modes per section: A→B transmission (DIR=H, OE=L), B→A transmission (DIR=L, OE=L), high-impedance isolation (OE=H), and power-up safe default (OE tied to VCCA via pullup resistor).

Key Specifications

Pinout & Package

SN74ALVC164245 is packaged in a 48-pin TSSOP (DL package) with 12.50 mm × 6.10 mm body size, 0.5-mm lead pitch, and exposed thermal pad. Pin numbering follows JEDEC MO-153 standard with dual-row configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC164245 and TXB0108, the SN74ALVC164245 uniquely combines dual independent 8-bit sections, 24-mA drive at 5.8-ns delay, and true dual-supply operation-making it the only option capable of replacing discrete 74LVC4245 pairs in high-reliability industrial backplanes.

Availability

SN74ALVC164245 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, network equipment backplanes, and medical imaging data acquisition systems requiring stable component supply across extended product lifecycles.

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 connectivity technologies with over 50 years of innovation in industrial, automotive, and communications markets.

The SN74ALVC164245 belongs to TI's Widebus™ family of high-speed logic devices, engineered specifically for robust bidirectional voltage translation in mixed-supply systems where timing predictability and latch-up immunity are critical.

FAQ

What voltage translation combinations does the SN74ALVC164245 support?

The SN74ALVC164245 supports 2.5-V ↔ 3.3-V and 3.3-V ↔ 5-V bidirectional translation. VCCA accepts 2.3–3.6 V for A-port logic, while VCCB accepts 3–5.5 V for B-port logic. Translation is asymmetric: A-port inputs tolerate up to VCCA + 0.5 V, B-port inputs tolerate up to VCCB + 0.5 V. The SN74ALVC164245 does not support 1.8-V translation.

How should OE and DIR pins be biased during power-up?

To ensure high-impedance state during power sequencing, OE must be tied to VCCA via a pullup resistor (value determined by driver sink capability). DIR can be held static (H for A→B, L for B→A) or ramped with VCCA. The SN74ALVC164245 requires ground connection before any supply voltage, and VCCA must power up before VCCB to prevent latch-up.

Can unused A-port or B-port pins be left floating?

No. All A-port and B-port inputs must be terminated to VCCA, VCCB, or GND-even when OE is high-because input circuitry remains active regardless of output-enable state. Floating inputs cause excess ICC and ICCZ, leading to unpredictable logic states and potential device damage. The SN74ALVC164245 datasheet explicitly mandates external biasing per TI application report SCBA004.

What is the maximum capacitive load the SN74ALVC164245 can drive reliably?

The SN74ALVC164245 maintains specified timing (5.8-ns tpd) and output voltage levels (VOH ≥ 2.0 V, VOL ≤ 0.55 V) driving up to 50 pF loads at 3.3 V. For heavier loads, derating applies: at 24-mA drive, total output current must not exceed 100 mA per device, and individual output current must stay within ±50 mA limits per I/O pin.

Does the SN74ALVC164245 require external termination resistors on its data lines?

External series termination is recommended for traces longer than 2 inches or operating above 50 MHz to suppress ringing caused by the SN74ALVC164245's fast edges (sub-2-ns rise/fall times at 24-mA drive). Parallel termination is not required, but proper grounding (eight GND pins) and VCC decoupling (0.1-µF ceramic per VCCA/VCCB pair) are mandatory for signal integrity.