Texas Instruments SN74ALVC164245DGG

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 directional control (1DIR/2DIR), independent output-enable per section (1OE/2OE), and TSSOP-48 package compatibility with high-density PCB layouts.

Technical Context

The SN74ALVC164245 implements two independent 8-bit transceiver sections, each with dedicated direction (DIR) and output-enable (OE) controls powered by VCCA. Its input circuitry remains active on both A and B ports regardless of OE state, requiring defined logic levels to prevent excess ICC and ICCZ. Control inputs VIH/VIL are referenced to VCCA, decoupling logic threshold stability from VCCB fluctuations.

Level translation operates via separate supply domains: VCCA powers A-port I/Os and control logic (2.5 V–3.3 V), while VCCB powers B-port I/Os (3.3 V–5 V). This architecture enables true bidirectional voltage translation - e.g., 2.5-V A-bus signals translated to 3.3-V B-bus outputs, or 5-V B-bus signals translated to 3.3-V A-bus outputs - without external biasing components.

Key Specifications

Pinout & Package

TSSOP-48 package (12.50 mm × 6.10 mm) with exposed thermal pad; pin-compatible with SSOP-48 and BGA MICROSTAR JUNIOR variants.

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 balances high drive strength, dual-supply flexibility, and deterministic directional control - making it the only option among the three capable of driving terminated 5-V buses while supporting 2.5-V microcontrollers in industrial automation designs.

Availability

SN74ALVC164245 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, telecom backplane interfaces, 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 90 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 reliability, timing precision, and noise immunity are critical.

FAQ

What voltage translation combinations does the SN74ALVC164245 support?

The SN74ALVC164245 supports 2.5-V ↔ 3.3-V, 3.3-V ↔ 5-V, and 2.5-V ↔ 5-V bidirectional translation. VCCA (2.3 V–3.6 V) powers the A-port and control logic, while VCCB (3 V–5.5 V) powers the B-port. The SN74ALVC164245 datasheet confirms valid operation across these ranges under recommended conditions, including VIH/VIL referencing to VCCA and input tolerance up to VCCx + 0.5 V.

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

To ensure high-impedance state during power sequencing, OE pins (1OE, 2OE) must be tied to VCCA via a pullup resistor; minimum resistance depends on driver sink capability. DIR pins (1DIR, 2DIR) should be ramped with VCCA - held low if A→B direction is needed at startup, or high if B→A is required. The SN74ALVC164245 design requires this sequence to prevent bus contention or undefined states.

Can the SN74ALVC164245 drive a 5-V bus with 3.3-V logic levels?

Yes - the SN74ALVC164245 B-port outputs swing to VCCB (up to 5 V) when driven by 3.3-V A-port logic, provided VCCB = 5 V and load current ≤24 mA. VOH specifications confirm 4.7 V min at IOH = –24 mA and VCCB = 5 V. The SN74ALVC164245 achieves this via level-shifted output stages, not passive translation, ensuring full-rail 5-V signaling from 3.3-V inputs.

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

The SN74ALVC164245 maintains 5.8-ns max tpd with CL ≤50 pF per output, as validated in switching characteristics tables. At 24-mA drive, it supports heavier loads - typical application curves show VOL ≤0.55 V at 24 mA into 50-pF loads. For >50-pF traces or stubs, series termination or reduced slew rate may be needed; the SN74ALVC164245's Δt/Δv spec (10 ns/V) guides layout to avoid ringing.

Does the SN74ALVC164245 require external biasing resistors for level translation?

No - the SN74ALVC164245 performs active level translation using internal dual-supply circuitry; no external resistors, diodes, or MOSFETs are needed. Its architecture inherently translates logic levels between VCCA and VCCB domains. External pullups are only required on OE pins for power-up safety, not for translation functionality - a key advantage over passive solutions like resistor dividers or discrete FET translators.