Texas Instruments SN74ALVCH16245DGVR

Overview

SN74ALVCH16245 from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver designed for asynchronous bidirectional data transfer between two 1.65–3.6-V buses. It features ±24-mA output drive at 3.3 V, 3 ns max propagation delay, bus-hold inputs eliminating external resistors, and operates across –40°C to +85°C. It is used in server backplanes and telecom infrastructure where level translation and high-drive bus interfacing are required.

For engineers reviewing the SN74ALVCH16245 datasheet, SN74ALVCH16245 pinout, SN74ALVCH16245 application, or SN74ALVCH16245 equivalent, key selection criteria include direction-control logic behavior, 3.3-V-compatible 5.5-V-tolerant inputs, high-impedance state control via OE, and TVSOP-48 package compatibility with dense PCB layouts.

Technical Context

The SN74ALVCH16245 implements dual independent 8-bit transceivers (A↔B), each controlled by dedicated DIR and OE inputs. Its bus-hold circuitry actively maintains valid logic states on undriven A/B port inputs without external biasing, reducing system component count.

Directional data flow is determined by DIR level (high = A→B, low = B→A), while OE enables/disables outputs (low = active, high = high-Z). Input tolerance up to 5.5 V enables down-translation from 5-V logic domains into 3.3-V or 1.8-V systems.

Key Specifications

Pinout & Package

SN74ALVCH16245DGVR is housed in a 48-pin TVSOP (Thin Very Small Outline Package) with 0.4-mm lead pitch and 4.4 mm × 9.7 mm body size. The package supports fine-pitch surface-mount assembly and offers thermal resistance of 58°C/W (R_θJA).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH16245DGVR, SN74LVC16245ADGGR sacrifices bus-hold robustness for lower gate count, while 74ALVCH16245ZQLR trades TVSOP accessibility for superior thermal density and space efficiency in automated SMT lines.

Availability

SN74ALVCH16245DGVR is available at Aetrix Electronics and suitable for cable modem termination systems, industrial PLC I/O expansion, telecom line cards, and LED video wall controllers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for SN74ALVCH16245DGVR 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 company specializing in analog, embedded processing, and connectivity technologies, with leadership in industrial, automotive, and communications markets.

The SN74ALVCH16245 belongs to TI's Widebus™ family of high-speed CMOS logic devices, engineered specifically for robust, low-voltage bidirectional bus interfacing in space-constrained and thermally demanding applications.

FAQ

What is the maximum data rate supported by SN74ALVCH16245DGVR?

The SN74ALVCH16245DGVR has a maximum propagation delay of 3 ns at 3.3 V, enabling reliable operation at data rates up to approximately 330 Mbps for single-bit toggling. Actual achievable throughput depends on load capacitance, trace impedance, and system timing margins - design validation with worst-case 50-pF loads and 3.3-V supplies is recommended before finalizing layout.

Does SN74ALVCH16245DGVR require external pullup resistors on its data lines?

No, SN74ALVCH16245DGVR includes active bus-hold circuitry on all A- and B-port inputs, which maintains valid logic states on undriven or floating lines without external pullup or pulldown resistors. Using external resistors with enabled bus-hold is not recommended and may cause contention or increased power draw.

Can SN74ALVCH16245DGVR interface a 5-V microcontroller with a 3.3-V FPGA?

Yes, SN74ALVCH16245DGVR supports 5.5-V tolerant inputs, allowing direct connection of 5-V logic signals to its A or B ports while operating from a 3.3-V VCC supply. This enables seamless down-translation without external level shifters - verified across the full 1.65–3.6-V VCC range.

How does the direction-control logic work on SN74ALVCH16245DGVR?

Each half of SN74ALVCH16245DGVR (1DIR/1OE and 2DIR/2OE) operates independently. When DIR is high and OE is low, data flows from A-port to B-port; when DIR is low and OE is low, data flows from B-port to A-port; when OE is high, both ports enter high-impedance state regardless of DIR level.

What is the thermal performance of SN74ALVCH16245DGVR in its TVSOP package?

SN74ALVCH16245DGVR in TVSOP-48 has a junction-to-ambient thermal resistance (R_θJA) of 58°C/W under standard JEDEC test conditions. With typical power dissipation below 50 mW in active operation, this allows safe operation up to +85°C ambient without forced airflow or heatsinking in most PCB layouts.