Texas Instruments SN74LVCR2245ADWR

Overview

SN74LVCR2245ADWR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between 1.65-V to 3.6-V buses. It supports mixed-mode signaling (5.5-V-tolerant inputs with 3.3-V VCC), delivers 6.3 ns max propagation delay at 3.3 V, integrates 26-Ω output series resistors, and features Ioff for live insertion and partial-power-down protection - used in server backplane interface buffering.

For engineers reviewing the SN74LVCR2245ADWR datasheet, SN74LVCR2245ADWR pinout, SN74LVCR2245ADWR application, or SN74LVCR2245ADWR equivalent, key selection criteria include voltage translation capability (5.5-V input tolerance), guaranteed tpd ≤6.3 ns at 3.3 V, Ioff-enabled power sequencing, 26-Ω on-die termination, and SOIC-20 package compatibility with industrial temperature range (–40°C to 125°C).

Technical Context

This device implements a noninverting octal transceiver architecture with independent DIR (direction) and OE (output enable) control logic. Data flows A→B when DIR = HIGH and OE = LOW; B→A when DIR = LOW and OE = LOW; both ports enter high-impedance isolation when OE = HIGH - enabling dynamic bus arbitration without contention.

All eight A/B I/O channels feature identical electrical characteristics: 5.5-V-tolerant inputs, 26-Ω series output resistance per channel, ±12 mA output drive capability at 3.3 V, and Ioff circuitry that disables outputs and blocks current flow when VCC = 0 V - critical for hot-swap and multi-rail system interoperability.

Key Specifications

Pinout & Package

SN74LVCR2245ADWR uses a 20-pin SOIC (DW) package with 12.80 mm × 7.50 mm body size, lead finish NIPDAU, and moisture sensitivity level (MSL) 1 - suitable for standard reflow without dry-pack requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC245A and SN74AVC245, the SN74LVCR2245ADWR uniquely combines 5.5-V input tolerance, integrated 26-Ω termination, and Ioff - making it the only option among the three qualified for mixed-voltage hot-swap backplane interfaces without supplemental components.

Availability

SN74LVCR2245ADWR is available at Aetrix Electronics and suitable for industrial automation, network infrastructure, and test equipment applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVCR2245ADWR 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 50 years of innovation in high-reliability logic and interface solutions.

The SN74LVCR2245ADWR belongs to TI's LVCR (Low-Voltage CMOS with Regulated outputs) logic family, engineered specifically for robust mixed-voltage bus interfacing in industrial, communications, and computing systems demanding Ioff, voltage translation, and integrated termination.

FAQ

What is the maximum input voltage the SN74LVCR2245ADWR can tolerate?

The SN74LVCR2245ADWR supports input voltages up to 5.5 V across its entire operating VCC range (1.65 V to 3.6 V). This overvoltage tolerance is explicitly specified in the Absolute Maximum Ratings table and confirmed in the Features section - enabling direct connection to 5-V logic without external clamping or level-shifting circuitry. The device maintains this rating regardless of whether VCC is at 1.65 V, 2.5 V, or 3.3 V.

Does the SN74LVCR2245ADWR require external series resistors on its outputs?

No, the SN74LVCR2245ADWR does not require external series resistors because each output integrates a matched 26-Ω series resistor. This is documented in the Features list ("All Outputs Have Equivalent 26-Ω Series Resistors, So No External Resistors are Required") and verified in the Electrical Characteristics table under "Output Series Resistance." The on-die termination reduces signal overshoot/undershoot and simplifies PCB layout for point-to-point or short-bus topologies.

How does the Ioff feature function in the SN74LVCR2245ADWR during power-down?

The Ioff feature in the SN74LVCR2245ADWR disables all outputs and blocks current flow when VCC = 0 V, even if input or output pins are driven to 5.5 V. As stated in the datasheet's Feature Description and Detailed Description sections, this prevents damaging back-current during partial-power-down or hot-insertion scenarios. Measured Ioff current is ±10 μA at VI/VO = 5.5 V and VCC = 0 V - ensuring safe operation in multi-rail systems.

What is the guaranteed maximum propagation delay for the SN74LVCR2245ADWR at 3.3 V?

The guaranteed maximum propagation delay (tpd) for the SN74LVCR2245ADWR is 6.3 ns at VCC = 3.3 V, TA = 25°C, with load conditions of CL = 50 pF and ΔV = ±0.3 V. This value is specified in the Switching Characteristics table (Section 7.6) and applies to both A→B and B→A data paths. At extended temperatures (–40°C to 125°C), the max tpd increases to 7.3 ns under identical conditions.

Which package type does the SN74LVCR2245ADWR use, and what are its key mechanical attributes?

The SN74LVCR2245ADWR uses a 20-pin SOIC (DW) package with nominal dimensions of 12.80 mm × 7.50 mm. Per the Mechanical, Packaging, and Orderable Information section, it has a body thickness of 2.35 mm, lead pitch of 1.27 mm, and is rated MSL-1 (unlimited floor life). The part marking is "LVCR2245A", and it ships in tape-and-reel format (2000 units/reel) with NIPDAU lead finish.