Texas Instruments SN74LVCR2245AZQNR

Overview

SN74LVCR2245AZQNR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between A and B buses in mixed-voltage systems. It operates from 1.65 V to 3.6 V, accepts 5.5 V-tolerant inputs, delivers ≤6.3 ns propagation delay at 3.3 V, and integrates 26-Ω output series resistors-enabling direct interface between 3.3-V microcontrollers and 5-V peripherals in wearable health devices and network switches.

For engineers reviewing the SN74LVCR2245AZQNR datasheet, SN74LVCR2245AZQNR pinout, SN74LVCR2245AZQNR application, or SN74LVCR2245AZQNR equivalent, key selection criteria include its Ioff-enabled live insertion support, ±12 mA output drive capability, 3.3-V/5-V level translation functionality, and VQFN-20 (RGY) package with 4.50 mm × 3.50 mm footprint for space-constrained PCB layouts.

Technical Context

This device implements a noninverting dual-bus architecture controlled by DIR (direction) and OE (output enable) pins. Its Ioff circuitry ensures back-drive protection during partial power-down, while integrated 26-Ω series resistors suppress overshoot/undershoot without external components. All I/Os tolerate up to 5.5 V regardless of VCC level, enabling robust voltage translation across 1.65–3.6 V supply domains.

Functional modes are strictly defined by OE and DIR logic states: OE = L enables bidirectional data flow (DIR = L routes B→A; DIR = H routes A→B), while OE = H forces all outputs into high-impedance isolation. The device meets JESD 17 latch-up immunity (>250 mA) and exceeds JESD 22 ESD ratings (2000-V HBM, 1000-V CDM).

Key Specifications

Pinout & Package

VQFN-20 (RGY) package with 4.50 mm × 3.50 mm body size, 0.5-mm pitch, and exposed thermal pad (Pin 20 = GND). Designed for reflow soldering with MSL Level-2-260°C-1 year rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVCR2245AZQNR, SN74LVC245AQPWRQ1 adds automotive qualification but removes 5-V tolerance, while SN74AVC245RHLR enables lower-voltage operation and faster timing but shifts termination responsibility to the PCB layout-making SN74LVCR2245AZQNR optimal for cost-sensitive, mixed-voltage industrial designs needing integrated signal integrity features.

Availability

SN74LVCR2245AZQNR is available at Aetrix Electronics and suitable for wearable health devices, network switches, servers, and tests and measurements equipment requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for SN74LVCR2245AZQNR 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 logic interface solutions and industrial-grade reliability validation.

The SN74LVCR2245A product line targets mixed-voltage system interfacing, delivering robust level translation, Ioff-enabled live insertion, and integrated signal conditioning for industrial, computing, and communications infrastructure applications.

FAQ

What is the maximum input voltage the SN74LVCR2245AZQNR can tolerate?

The SN74LVCR2245AZQNR accepts input voltages up to 5.5 V on all A- and B-port pins, regardless of VCC level (1.65 V to 3.6 V). This overvoltage tolerance enables direct connection to 5-V logic without external level-shifting components, as confirmed in Section 7.3 (Recommended Operating Conditions) and Feature Description of the datasheet.

Does the SN74LVCR2245AZQNR support partial power-down operation?

Yes, the SN74LVCR2245AZQNR includes Ioff circuitry that disables outputs and blocks current backflow when VCC = 0 V. This feature supports live insertion and hot-swap applications, as explicitly stated in the Features section and Detailed Description (Section 9.3) of the SCAS581N datasheet.

What is the propagation delay of the SN74LVCR2245AZQNR at 3.3 V?

The maximum propagation delay (tpd) of the SN74LVCR2245AZQNR is 6.3 ns at VCC = 3.3 V, TA = 25°C, as specified in Table 7.6 (Switching Characteristics, –40°C to 85°C) of the datasheet. This value applies to both A→B and B→A data paths under standard load conditions (CL = 50 pF).

What package type does the SN74LVCR2245AZQNR use?

The SN74LVCR2245AZQNR uses the VQFN-20 (RGY) package with a 4.50 mm × 3.50 mm body size, 0.5-mm pitch, and exposed thermal pad. This information is documented in the Device Information table (Section 3) and Mechanical, Packaging, and Orderable Information (Addendum) of the datasheet.

How does the SN74LVCR2245AZQNR handle bus contention during direction changes?

The SN74LVCR2245AZQNR avoids bus contention through strict functional mode control: OE must be high (disabled) during DIR transitions to ensure both A and B ports are in high-impedance state before changing direction. This sequencing requirement is implied by the Function Table (Table 2) and Application Information (Section 10.1), which emphasize isolation during power-up/down and direction switching.