Texas Instruments SN74LVCC4245ADWR

Overview

SN74LVCC4245ADWR from Texas Instruments is an octal dual-supply bus transceiver enabling bidirectional level translation between 5V (A port, VCCA = 4.5–5.5V) and 3.3V/5V (B port, VCCB = 2.7–5.5V) domains, with 24mA drive strength at 3V, 3-state outputs controlled by DIR/OE, and robust glitch-free power sequencing. It serves in industrial motor control interfaces and distributed power systems requiring voltage-domain isolation.

For engineers reviewing the SN74LVCC4245ADWR datasheet, SN74LVCC4245ADWR pinout, SN74LVCC4245ADWR application, or SN74LVCC4245ADWR equivalent, key selection considerations include its VCCA-referenced control logic, Ioff partial-power-down protection, VCC isolation behavior (<100mV threshold), and compatibility with legacy SN74LVC4245 layouts in TSSOP-24 packaging.

Technical Context

The SN74LVCC4245ADWR implements asynchronous, noninverting bidirectional data transfer using separate VCCA (5V domain) and VCCB (configurable 2.7–5.5V domain) rails. Its DIR input selects direction (A→B or B→A), while OE (active-low, VCCA-referenced) enables/disables all I/Os into high-impedance states.

Glitch-free power sequencing ensures safe operation during arbitrary VCCA/VCCB ramp-up/down order, and VCC isolation forces both ports into high-Z when either supply drops below 100mV or floats. The device supports Ioff protection (±2µA leakage at VCC=0V) and meets JESD 17 latch-up (>250mA) and JESD 22 ESD (2000V HBM, 1000V CDM) requirements.

Key Specifications

Pinout & Package

TSSOP-24 package (9.7mm × 6.4mm), 0.65mm pitch, surface-mount, moisture-sensitive level 1 (MSL-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC4245ADWR and TXB0108PWR, the SN74LVCC4245ADWR uniquely delivers 24mA drive, explicit DIR control for deterministic timing, and hardware-enforced VCC isolation-making it optimal for industrial power electronics where reliability under supply fault conditions is non-negotiable.

Availability

SN74LVCC4245ADWR is available at Aetrix Electronics and suitable for industrial motor control, renewable energy inverters, and building automation systems requiring stable component supply across extended temperature and long product lifecycles.

Supply support for SN74LVCC4245ADWR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN74LVCC4245ADWR belongs to TI's LVCC logic family, engineered specifically for robust voltage translation in harsh industrial environments with emphasis on power sequencing resilience and system-level fault containment.

FAQ

What voltage levels can SN74LVCC4245ADWR translate between?

The SN74LVCC4245ADWR supports bidirectional level translation between a fixed 4.5–5.5V A port (VCCA) and a configurable 2.7–5.5V B port (VCCB). This enables reliable 5V ↔ 3.3V and 5V ↔ 5V translation. VCCB directly sets B-port output voltage, and control inputs (DIR/OE) are referenced to VCCA - ensuring compatibility with 5V host logic regardless of VCCB setting. The SN74LVCC4245ADWR does not support sub-2.7V or >5.5V operation on either rail.

How does SN74LVCC4245ADWR handle power supply sequencing during startup or brownout?

The SN74LVCC4245ADWR features glitch-free power supply sequencing: either VCCA or VCCB may be powered on/off in any order without generating erroneous output transitions. During brownout, if either supply drops below 100mV or floats, the SN74LVCC4245ADWR automatically places both A and B ports into high-impedance state - preventing bus contention and downstream device misoperation. This behavior is hardware-enforced and requires no external circuitry.

What is the maximum output drive capability of SN74LVCC4245ADWR and under what conditions?

The SN74LVCC4245ADWR delivers ±24mA output drive per channel when VCCB = 2.7–4.5V and VCCA = 4.5–5.5V. This is verified at 3V VCCB (IOH = –24mA, VOL ≤ 0.44V; IOL = 24mA, VOH ≥ 3.76V). The high drive supports heavy capacitive loads (e.g., long PCB traces, multiple CMOS inputs) and reduces signal rise/fall time - critical for noise-sensitive industrial bus interfaces. Drive degrades slightly at VCCB extremes (2.7V or 5.5V) per datasheet electrical characteristics.

Does SN74LVCC4245ADWR support partial power-down, and how is it implemented?

Yes, the SN74LVCC4245ADWR supports partial power-down via Ioff circuitry. When VCCA = 0V (while VCCB remains active), leakage current into/out of any I/O pin is limited to ±2µA maximum - preventing damaging backflow current from powered B-port circuits into the unpowered A side. This feature is intrinsic to the silicon design and requires no external components. The SN74LVCC4245ADWR maintains this protection across –40°C to +85°C and is validated per JESD 78.

Is SN74LVCC4245ADWR pin-compatible with SN74LVC4245ADWR, and what layout changes are needed?

The SN74LVCC4245ADWR uses identical TSSOP-24 pinout and footprint as SN74LVC4245ADWR, enabling drop-in replacement on existing boards designed for the latter. No PCB layout changes are required. However, SN74LVCC4245ADWR introduces VCCB (pin 24) and removes one GND pin (original SN74LVC4245ADWR has two GNDs at pins 11/12; SN74LVCC4245ADWR adds GND at pin 13). Designers must route VCCB separately and verify GND connections match the three-GND configuration (pins 11,12,13) of the SN74LVCC4245ADWR.