Texas Instruments 74LVCHR16245ALRG4

Overview

74LVCHR16245ALRG4 from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between 1.65-V to 3.6-V buses. It supports mixed-mode signal operation (5.5-V-tolerant inputs with 3.3-V V_CC), features integrated 26-Ω output series resistors, bus-hold on all data I/Os, and I_off for live insertion. Used in telecom infrastructure backplanes and industrial transport control modules.

For engineers reviewing the 74LVCHR16245ALRG4 datasheet, 74LVCHR16245ALRG4 pinout, 74LVCHR16245ALRG4 application, or 74LVCHR16245ALRG4 equivalent, key selection criteria include voltage translation capability (5.5-V input tolerance at 3.3-V V_CC), propagation delay ≤4.8 ns at 3.3 V, 125°C operating temperature, and TSSOP-48 package compatibility with high-density PCB layouts.

Technical Context

This device implements two independent 8-bit bidirectional transceiver channels, each controlled by dedicated DIR and OE pins (1DIR/1OE and 2DIR/2OE), enabling flexible A↔B or B↔A data flow per channel. Direction control is level-sensitive and asynchronous; output enable operates independently per channel to isolate either bus segment without affecting the other.

All 32 I/O pins (16 A-side, 16 B-side) feature bus-hold circuitry eliminating external biasing, and internal 26-Ω series termination reduces overshoot/undershoot-no external resistors required. I_off protection ensures zero current backflow when V_CC = 0 V, supporting partial power-down and hot-swap compliance.

Key Specifications

Pinout & Package

TSSOP-48 package (body size 12.50 mm × 6.10 mm), lead-free and RoHS-compliant, optimized for automated surface-mount assembly and thermal performance in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16245A and 74AVCH16245, the 74LVCHR16245ALRG4 uniquely combines 5.5-V input tolerance, bus-hold, and I_off in a single TSSOP-48 package-enabling drop-in replacement in mixed-voltage industrial and telecom systems without layout or firmware changes.

Availability

74LVCHR16245ALRG4 is available at Aetrix Electronics and suitable for telecom infrastructures, industrial transport controllers, and server memory expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVCHR16245ALRG4 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 logic and interface solutions.

The 74LVCHR16245ALRG4 belongs to TI's Widebus™ family of advanced bus interface devices, engineered specifically for robust, low-latency, mixed-voltage data bridging in mission-critical infrastructure equipment.

FAQ

What is the maximum input voltage rating for 74LVCHR16245ALRG4?

The 74LVCHR16245ALRG4 supports input voltages up to 5.5 V across its entire valid V_CC range (1.65 V to 3.6 V). This allows direct connection to 5-V logic sources without external level-shifting circuitry, making it ideal for down-translation in mixed-voltage systems. The absolute maximum input rating remains 5.5 V regardless of V_CC level, as confirmed in Section 7.1 of the official datasheet SCAS582Q.

Does 74LVCHR16245ALRG4 require external pull-up or pull-down resistors?

No, the 74LVCHR16245ALRG4 does not require external pull-up or pull-down resistors due to integrated bus-hold circuitry on all 32 data I/O pins (A1–A8, B1–B8 per channel). This feature actively maintains the last-valid logic state on floating inputs, eliminating undefined behavior. External biasing is discouraged and may interfere with bus-hold operation, as explicitly stated in Section 9.1 of the datasheet.

What is the purpose of the I_off feature in 74LVCHR16245ALRG4?

The I_off feature in the 74LVCHR16245ALRG4 disables all outputs and blocks current backflow when V_CC = 0 V, supporting safe live insertion, partial power-down, and hot-swap operations. With I_off leakage limited to ±10 µA, the device prevents damage to powered subsystems during board replacement or power sequencing faults-critical for telecom and industrial control applications.

How many independent transceiver channels does 74LVCHR16245ALRG4 contain?

The 74LVCHR16245ALRG4 contains two independent 8-bit transceiver channels (Channel 1: 1DIR/1OE; Channel 2: 2DIR/2OE), configurable as either separate 8-bit bidirectional paths or combined as a single 16-bit transceiver. Each channel has dedicated direction and output-enable controls, allowing asymmetric bus isolation-for example, enabling A→B flow on Channel 1 while disabling Channel 2 entirely.

What package type and dimensions does 74LVCHR16245ALRG4 use?

The 74LVCHR16245ALRG4 uses a TSSOP-48 package (package drawing DGG) with nominal body dimensions of 12.50 mm × 6.10 mm and 0.5-mm lead pitch. It is RoHS-compliant, green (halogen-free), and rated MSL Level-1 at 260°C peak reflow temperature-suitable for high-volume automated assembly and thermally demanding environments up to 125°C ambient.