Texas Instruments SN74LVCC4245APWRE4

Overview

SN74LVCC4245APWRE4 from Texas Instruments is an octal dual-supply bus transceiver enabling bidirectional voltage-level translation between 5V (A port, VCCA = 4.5–5.5V) and 3.3V/5V (B port, VCCB = 2.7–5.5V), with 24mA drive strength at 3V, 3-state outputs, and robust glitch-free power sequencing. It serves as a critical interface in industrial motor control and distributed automation systems requiring reliable cross-voltage data exchange.

For engineers reviewing the SN74LVCC4245APWRE4 datasheet, SN74LVCC4245APWRE4 pinout, SN74LVCC4245APWRE4 application, or SN74LVCC4245APWRE4 equivalent, key selection criteria include its VCCA/VCCB isolation behavior, Ioff-enabled partial-power-down capability, direction-controlled asynchronous data flow, and TSSOP-24 package compatibility with legacy '245 footprints.

Technical Context

The SN74LVCC4245APWRE4 implements a noninverting octal transceiver architecture with independent A- and B-port power domains. Control logic (DIR, OE) is referenced to VCCA, while I/O levels on each port track their respective supply rails-enabling true bidirectional level shifting without external biasing.

Its VCC isolation feature forces both ports into high-impedance when either VCCA or VCCB falls below 100mV or floats, and the Ioff circuitry prevents backflow current during partial power-down. Propagation delays are specified down to 1ns (typical) for A↔B translation under 50pF load at 5V/3.3V operation.

Key Specifications

Pinout & Package

TSSOP-24 (PW) package: 9.7mm × 6.4mm body, 0.65mm pitch, surface-mount, 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 SN74LVC4245APWRE4 and TXB0108PWR, the SN74LVCC4245APWRE4 uniquely delivers simultaneous 5V/3.3V rail independence, 24mA drive, and hardware-controlled direction-making it the sole option for deterministic, high-drive, mixed-voltage parallel bus interfacing in industrial power electronics.

Availability

SN74LVCC4245APWRE4 is available at Aetrix Electronics and suitable for PLC backplane design, servo drive communication, string inverter monitoring, and industrial data concentrators requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for SN74LVCC4245APWRE4 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 decades of experience in industrial-grade interface solutions.

The SN74LVCC4245APWRE4 belongs to TI's LVCC logic family, engineered specifically for robust voltage translation in harsh industrial environments where supply sequencing, ESD resilience, and high-drive capability are mission-critical.

FAQ

What voltage ranges does the SN74LVCC4245APWRE4 support on its A and B ports?

The SN74LVCC4245APWRE4 supports 4.5V to 5.5V on the A port (VCCA) and 2.7V to 5.5V on the B port (VCCB). This allows bidirectional translation between standard 5V logic and 3.3V or 5V systems. The control inputs (DIR, OE) are referenced solely to VCCA, ensuring consistent threshold behavior regardless of VCCB level. Operation outside these ranges risks violating absolute maximum ratings.

How does the VCC isolation feature work in the SN74LVCC4245APWRE4?

The SN74LVCC4245APWRE4 enters high-impedance on both A and B ports when either VCCA or VCCB drops below 100mV or is left floating. This prevents unintended signal coupling or bus contention during partial power-down events. The isolation is automatic and requires no external circuitry-critical for modular power architectures where supplies may be sequenced independently.

Can the SN74LVCC4245APWRE4 replace the SN74LVC4245APWRE4 on an existing PCB?

Yes-the SN74LVCC4245APWRE4 uses the same TSSOP-24 (PW) package and pinout as the SN74LVC4245APWRE4, enabling drop-in replacement. However, unlike the LVC version, the LVCC variant adds VCCB independence and isolation features. To retain full functionality, ensure VCCB is properly decoupled and that unused control inputs are tied to valid logic levels per TI layout guidelines.

What is the maximum data rate supported by the SN74LVCC4245APWRE4?

The SN74LVCC4245APWRE4 supports data rates up to approximately 100Mbps in typical conditions, based on its worst-case propagation delay of 7.4ns (B→A, VCCB = 2.7V) and 7.1ns (A→B, VCCB = 5.5V) under 50pF load. Real-world throughput depends on trace capacitance, termination, and noise margin-but the device is routinely deployed in 25–50MHz parallel bus applications like Modbus data concentrators and servo feedback links.

Does the SN74LVCC4245APWRE4 require external pull-up or pull-down resistors?

No external pull-ups or pull-downs are required for DIR or OE, as these inputs are CMOS-compatible and fully specified over the VCCA range. However, TI strongly recommends tying all unused A/B port pins to GND or VCCA/VCCB (not floating) to prevent undefined states and potential shoot-through current. Floating I/Os can cause increased ICC and erratic behavior, especially near temperature extremes.