Texas Instruments SN74LVCC3245ANSRE4

Overview

SN74LVCC3245ANSRE4 from Texas Instruments is an octal noninverting bus transceiver with dual supply rails (VCCA: 2.3–3.6 V, VCCB: 3–5.5 V), enabling bidirectional level translation between 2.5/3.3 V and 3.3/5 V systems. It features 3-state outputs controlled by DIR and active-low OE, 24 mA drive strength at 3 V, and VCC isolation that forces high-impedance I/O when either supply drops below 100 mV - critical for mixed-voltage industrial control interfaces.

For engineers reviewing the SN74LVCC3245ANSRE4 datasheet, SN74LVCC3245ANSRE4 pinout, SN74LVCC3245ANSRE4 application, or SN74LVCC3245ANSRE4 equivalent, key selection criteria include verified voltage translation range (2.3–5.5 V across ports), glitch-free power sequencing behavior, Ioff partial-power-down support, and TSSOP-24 package compatibility with 7.8 mm × 6.4 mm footprint.

Technical Context

The SN74LVCC3245ANSRE4 implements asynchronous bidirectional data flow using a direction-controlled architecture: DIR = HIGH enables A→B transmission; DIR = LOW enables B→A transmission; OE = HIGH disables all outputs into high-impedance. Control logic (DIR, OE) is referenced to VCCA, ensuring stable operation even during asymmetric supply ramping.

Its dual-rail design supports true level-shifting without external components: A-port I/Os track VCCA (2.3–3.6 V), B-port I/Os track VCCB (3–5.5 V). The VCC isolation feature guarantees automatic high-Z state when either VCCA or VCCB falls below 100 mV or floats - eliminating risk of backdrive current in hot-swap or partial-power-down scenarios.

Key Specifications

Pinout & Package

TSSOP-24 package (PW variant), 7.8 mm × 6.4 mm body size, 0.65 mm lead pitch, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC8T245RHLR and TXS0108EJRGR, the SN74LVCC3245ANSRE4 uniquely delivers full 2.3–5.5 V dual-rail translation with hardware DIR control, VCC isolation, and 24 mA drive - making it the only option among the three qualified for industrial 5 V bus interfacing with fail-safe power sequencing.

Availability

SN74LVCC3245ANSRE4 is available at Aetrix Electronics and suitable for ultrasound scanner interfaces, solar string inverter control, and single-board computer expansion requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74LVCC3245ANSRE4 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 expertise in high-reliability interface solutions.

The SN74LVCC3245ANSRE4 belongs to TI's LVCC logic family, engineered specifically for robust mixed-voltage system interconnect - targeting industrial automation, renewable energy, and medical imaging where supply sequencing resilience and voltage domain bridging are critical.

FAQ

What voltage ranges does the SN74LVCC3245ANSRE4 support on its A and B ports?

The SN74LVCC3245ANSRE4 supports 2.3 V to 3.6 V on the A port (VCCA) and 3 V to 5.5 V on the B port (VCCB). This allows bidirectional level translation between common logic families such as 2.5 V/3.3 V microcontrollers and 5 V peripherals. Both rails operate independently, and the device remains functional across the full specified range without derating.

How does the VCC isolation feature work in the SN74LVCC3245ANSRE4?

The SN74LVCC3245ANSRE4 enters high-impedance mode on all I/Os when either VCCA or VCCB falls below 100 mV or is left floating. This VCC isolation prevents backdrive current and unintended signal coupling during partial power-down or hot-swap events. The behavior is automatic and requires no external control - a key safety feature for industrial systems with staged power sequencing.

Is the SN74LVCC3245ANSRE4 compatible with 3.3 V-only or 5 V-only systems?

Yes - the SN74LVCC3245ANSRE4 operates correctly in single-rail configurations. When used in a 3.3 V-only system, tie VCCA = VCCB = 3.3 V; for 5 V-only, set VCCA = 3.6 V (max allowed) and VCCB = 5 V. The device maintains full functionality including DIR/OE control and 3-state output behavior in both cases, as confirmed in Section 6.4 of the datasheet.

What is the maximum data rate supported by the SN74LVCC3245ANSRE4?

The SN74LVCC3245ANSRE4 achieves propagation delays as low as 5.3 ns (A→B, VCCA=2.7–3.6 V/VCCB=5 V), supporting reliable operation at bus clock rates up to approximately 100 MHz under typical load conditions (CL = 30–50 pF). Actual achievable rate depends on trace capacitance, termination, and noise margin - but the device is routinely deployed in high-speed parallel control buses in ultrasound and inverter applications.

Does the SN74LVCC3245ANSRE4 require external pull-up or pull-down resistors on DIR or OE?

No - the SN74LVCC3245ANSRE4 has internally biased control inputs referenced to VCCA, so DIR and OE do not require external biasing. However, TI recommends tying unused control inputs to valid logic levels (VCCA or GND) to prevent floating states. OE is active-low and DIR is active-high, both interpreted relative to VCCA voltage, ensuring predictable behavior across supply variations.