Texas Instruments 74LVCR2245ADBQRG4

Overview

74LVCR2245ADBQRG4 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), features integrated 26-Ω output series resistors, and delivers 6.3 ns max propagation delay at 3.3 V - enabling use in high-speed industrial backplanes and FPGA I/O bridging.

For engineers reviewing the 74LVCR2245ADBQRG4 datasheet, 74LVCR2245ADBQRG4 pinout, 74LVCR2245ADBQRG4 application, or 74LVCR2245ADBQRG4 equivalent, key selection criteria include its Ioff-enabled live insertion capability, 125°C operating temperature support, 5.5-V input overvoltage tolerance, and SSOP-20 package compatibility with legacy 3.3-V logic interfaces.

Technical Context

This device implements a noninverting dual-bus transceiver architecture with independent direction (DIR) and output-enable (OE) control. Its Ioff circuitry actively disables outputs when VCC = 0 V, preventing back-drive current during partial power-down - critical for hot-swap systems and modular computing.

All eight A/B channel pairs operate synchronously under shared DIR/OE logic, with each output incorporating on-die 26-Ω series termination to suppress overshoot/undershoot without external components. Input thresholds scale with VCC (VIH = 0.65×VCC min at 1.65 V), ensuring robust noise margins across the full 1.65–3.6-V supply range.

Key Specifications

Pinout & Package

74LVCR2245ADBQRG4 uses a 20-pin SSOP (Shrink Small Outline Package) with 0.65-mm lead pitch and body dimensions of 8.65 mm × 3.90 mm. The package is RoHS-compliant, moisture-sensitive level 2 (260°C peak reflow), and optimized for automated surface-mount assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC245APWR and 74AVC245TTR, the 74LVCR2245ADBQRG4 uniquely combines 5.5-V input tolerance, integrated 26-Ω termination, and 125°C operation - making it the only choice for thermally demanding, mixed-voltage industrial backplane designs requiring zero-layout overhead.

Availability

74LVCR2245ADBQRG4 is available at Aetrix Electronics and suitable for industrial network switches, server baseboard management subsystems, and automotive ADAS diagnostic interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVCR2245ADBQRG4 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 ICs engineered for reliability in harsh environments - targeting industrial automation, telecom infrastructure, and automotive electronics where signal integrity and thermal resilience are non-negotiable.

FAQ

What is the maximum input voltage the 74LVCR2245ADBQRG4 can safely accept?

The 74LVCR2245ADBQRG4 accepts input voltages up to 5.5 V on all A- and B-port pins, regardless of VCC setting (1.65–3.6 V). This overvoltage tolerance is explicitly specified in the Absolute Maximum Ratings table and enables direct interfacing with 5-V logic without external clamping or level-shifting circuitry. The 74LVCR2245ADBQRG4 maintains this rating across its full –40°C to +125°C operating temperature range.

Does the 74LVCR2245ADBQRG4 require external termination resistors?

No, the 74LVCR2245ADBQRG4 does not require external termination resistors. Each output incorporates an integrated 26-Ω series resistor, as confirmed in the Features section and Electrical Characteristics table. This design eliminates the need for discrete resistors on PCB traces, reducing component count, saving board space, and simplifying layout - particularly beneficial in dense industrial and automotive modules where routing real estate is constrained.

How does the Ioff feature of the 74LVCR2245ADBQRG4 protect system-level circuits?

The Ioff feature of the 74LVCR2245ADBQRG4 disables all outputs when VCC = 0 V, limiting input/output leakage current to ±10 μA even when pins are driven to 5.5 V. This prevents damaging back-current flow during hot-insertion, partial power-down, or mismatched power sequencing - a critical safeguard in modular server backplanes and field-replaceable automotive ECUs where uncontrolled current paths could corrupt adjacent logic or damage upstream drivers.

What is the guaranteed maximum propagation delay for the 74LVCR2245ADBQRG4 at 3.3 V?

The guaranteed maximum propagation delay (tpd) for the 74LVCR2245ADBQRG4 is 6.3 ns at VCC = 3.3 V, TA = –40°C to +85°C, as specified in Table 7.6 (Switching Characteristics, –40°C to 85°C). At the extended –40°C to +125°C range, the max tpd increases to 7.3 ns under identical conditions. These values are measured with CL = 50 pF and VO = ±0.3 V, ensuring timing predictability in real-world loaded bus environments.

Which package type does the 74LVCR2245ADBQRG4 use, and what are its key mechanical attributes?

The 74LVCR2245ADBQRG4 uses a 20-pin SSOP (Shrink Small Outline Package) with part number suffix DBQ. Its body dimensions are 8.65 mm × 3.90 mm, lead pitch is 0.65 mm, and it is rated MSL Level-2 (260°C peak reflow, 1-year floor life). The package is RoHS-compliant, features NiPdAu lead finish, and is optimized for high-density automated assembly in industrial and automotive PCBs where thermal cycling reliability is essential.