Texas Instruments SN74LVCR2245ADBQR

Overview

SN74LVCR2245ADBQR from Texas Instruments is an octal noninverting bus transceiver with 3-state outputs, designed for bidirectional data flow between 1.65-V to 3.6-V buses while accepting 5.5-V-tolerant inputs. It features integrated 26-Ω output series resistors, 6.3 ns max propagation delay at 3.3 V, and I_off support for live insertion in mixed-voltage systems such as server backplanes.

For engineers reviewing the SN74LVCR2245ADBQR datasheet, SN74LVCR2245ADBQR pinout, SN74LVCR2245ADBQR application, or SN74LVCR2245ADBQR equivalent, key selection criteria include voltage translation capability (3.3-V core ↔ 5-V peripherals), bus isolation via OE/DIR control, thermal performance in SSOP-20 package, and compatibility with partial-power-down system architectures.

Technical Context

This device implements asynchronous bidirectional data transfer using a single DIR pin to select A→B or B→A direction, and an active-low OE pin to place all outputs in high-impedance state. Its I_off circuitry ensures no current backflow when V_CC = 0 V, enabling safe hot-plug operation.

All eight A-side and eight B-side I/Os are individually configurable as inputs or outputs based on DIR state, with each output capable of sinking up to 12 mA while maintaining VOL ≤ 0.8 V at V_CC = 3.3 V and I_OL = 12 mA. Input thresholds scale with V_CC, supporting VIH ≥ 2 V and VIL ≤ 0.8 V across full operating range.

Key Specifications

Pinout & Package

SN74LVCR2245ADBQR is housed in a 20-pin SSOP (Shrink Small Outline Package) with body dimensions 8.65 mm × 3.90 mm and standard 0.65-mm lead pitch. The package supports surface-mount reflow per JEDEC Level-2-260°C-1-year MSL rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC245A and TXB0108, the SN74LVCR2245ADBQR uniquely combines 5.5-V input tolerance, integrated termination, and deterministic DIR/OE control-making it optimal for high-reliability, mixed-voltage backplane interconnects where timing predictability and layout simplicity are critical.

Availability

SN74LVCR2245ADBQR is available at Aetrix Electronics and suitable for server backplanes, wearable health devices, and test equipment requiring stable component supply with guaranteed long-term manufacturability.

Supply support for SN74LVCR2245ADBQR 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 90 years of innovation in industrial, automotive, and communications markets.

The SN74LVCR2245A product line delivers robust, mixed-voltage bus interface solutions for next-generation computing infrastructure where reliability, thermal efficiency, and design simplification are paramount.

FAQ

What is the maximum input voltage the SN74LVCR2245ADBQR can tolerate?

The SN74LVCR2245ADBQR accepts input voltages up to 5.5 V regardless of V_CC level, enabling direct connection to 5-V logic without external clamping diodes or level shifters. This overvoltage tolerance is specified across the full operating temperature range (–40°C to +125°C) and applies to all A- and B-side I/O pins, making SN74LVCR2245ADBQR ideal for mixed-voltage system integration.

How does the I_off feature function in the SN74LVCR2245ADBQR?

The I_off circuitry in SN74LVCR2245ADBQR disables all outputs and isolates input/output terminals when V_CC = 0 V, limiting leakage current to ±10 μA even with 5.5-V signals present. This prevents damaging back-current during hot-swap events or partial power-down states, satisfying JEDEC JESD78 latch-up immunity requirements and enabling safe use in modular server and telecom chassis designs.

What is the purpose of the integrated 26-Ω series resistors in the SN74LVCR2245ADBQR?

The integrated 26-Ω series resistors in SN74LVCR2245ADBQR damp signal reflections and reduce overshoot/undershoot on transmission lines, eliminating the need for eight discrete external termination resistors. This lowers BOM cost, saves PCB area, and improves signal integrity in high-speed parallel bus applications such as memory module interfaces and backplane data routing.

Can the SN74LVCR2245ADBQR operate at 1.65 V and still meet timing specifications?

Yes, SN74LVCR2245ADBQR is fully characterized down to 1.65 V, with t_pd max = 10.9 ns at V_CC = 1.8 V and –40°C to +85°C. At 1.65 V, propagation delay increases slightly but remains within functional limits for low-speed control buses. The device maintains valid VIH/VIL thresholds and output drive strength across the entire 1.65–3.6 V range, ensuring reliable operation in ultra-low-power embedded systems.

What package type is used for the SN74LVCR2245ADBQR and what are its key mechanical attributes?

SN74LVCR2245ADBQR uses the SSOP-20 (DBQ) package with nominal body dimensions of 8.65 mm × 3.90 mm and 0.65-mm lead pitch. It features gull-wing leads compatible with standard SMT reflow profiles (JEDEC Level-2-260°C-1-year), and its thermal resistance R_θJA is 94.7°C/W - optimized for natural convection cooling in dense PCB layouts typical of networking and industrial control equipment.