Texas Instruments SN74AVCH16T245GQLR

Overview

SN74AVCH16T245 from Texas Instruments is a 16-bit dual-supply bus transceiver with configurable level-shifting between 1.2 V and 3.6 V rails, tri-state outputs, VCC isolation, and Ioff partial-power-down support. It enables bidirectional voltage translation between mismatched logic domains (e.g., 1.8 V microcontroller to 3.3 V peripheral), features bus-hold on all data inputs, and tolerates 4.6 V on I/Os. Used in mixed-voltage system interconnects requiring robust isolation and low static power.

For engineers reviewing the SN74AVCH16T245 datasheet, SN74AVCH16T245 pinout, SN74AVCH16T245 application, or SN74AVCH16T245 equivalent, key selection criteria include dual-rail supply independence (VCCA/VCCB = 1.2–3.6 V), 380 Mbps max data rate (1.8 V → 3.3 V), Ioff current ≤ ±5 µA at 0 V supply, 4.6 V overvoltage tolerance, and guaranteed high-impedance state during VCC loss.

Technical Context

The SN74AVCH16T245 implements two independent 8-bit transceiver channels (1A↔1B and 2A↔2B), each controlled by dedicated DIR and OE pins referenced to VCCA. Its fully configurable dual-rail architecture allows asymmetric operation - e.g., VCCA = 1.8 V for A-port logic while VCCB = 3.3 V for B-port interface - with direction control determining signal flow (A→B or B→A) and OE enabling/disabling both ports simultaneously.

VCC isolation ensures that if either VCCA or VCCB drops to GND, both A and B ports enter high-impedance state regardless of DIR/OE states, preventing bus contention. The integrated bus-hold circuitry sustains valid logic levels on undriven inputs without external resistors, and Ioff functionality limits backflow current to ≤±5 µA when either supply is powered down.

Key Specifications

Pinout & Package

GQL package: 48-pin TSSOP (12.50 mm × 6.10 mm), lead pitch 0.5 mm, exposed pad not present. Pin numbering follows standard TSSOP top-view convention with pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16T245DGGR and TXB0108PWR, the SN74AVCH16T245 uniquely combines dual-rail independence, VCC isolation, Ioff, and 380 Mbps performance - making it irreplaceable in high-reliability, mixed-voltage parallel bus architectures where supply fault tolerance and timing precision are mandatory.

Availability

SN74AVCH16T245 is available at Aetrix Electronics and suitable for industrial PLC backplanes, enterprise SSD controllers, telecom baseband bridges, and medical imaging sensor hubs requiring stable component supply across extended product lifecycles.

Supply support for SN74AVCH16T245 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 and embedded processing technologies, with leadership in precision analog, power management, and interface solutions.

The SN74AVCH16T245 belongs to TI's advanced voltage translation portfolio, engineered specifically for robust, high-speed interoperability between heterogeneous low-voltage logic domains in mission-critical infrastructure and industrial systems.

FAQ

What is the minimum operating voltage for SN74AVCH16T245 on both VCCA and VCCB rails?

The SN74AVCH16T245 supports a minimum supply voltage of 1.2 V on both VCCA and VCCB rails, enabling compatibility with ultra-low-voltage logic families such as 1.2 V ASICs and next-generation processors. Operation below 1.2 V is not specified and may result in undefined behavior or failure to meet timing and drive strength guarantees.

Does SN74AVCH16T245 require external pull-up or pull-down resistors on its data lines?

No, the SN74AVCH16T245 integrates active bus-hold circuitry on all A- and B-port data inputs, which maintains valid logic states on undriven or floating lines without external resistors. Using external pull-up or pull-down resistors with bus-hold enabled is explicitly discouraged in the datasheet and may cause excessive current draw or logic instability.

How does the VCC isolation feature function in SN74AVCH16T245 during power sequencing?

The VCC isolation feature in SN74AVCH16T245 forces both A and B ports into high-impedance state whenever either VCCA or VCCB drops to GND - regardless of DIR or OE logic levels. This prevents bus contention and false signaling during asymmetric power-up/down sequences common in modular systems, and is verified by IOZ measurements in the Electrical Characteristics table.

Can SN74AVCH16T245 translate between 1.2 V and 3.3 V at full speed?

Yes, the SN74AVCH16T245 supports 1.2 V ↔ 3.3 V level translation, though at a reduced maximum data rate of 100 Mbps (per switching characteristics tables). Full 380 Mbps performance is achieved only between 1.8 V and 3.3 V; lower-voltage combinations trade speed for compatibility across the full 1.2–3.6 V range.

What is the guaranteed Ioff current specification for SN74AVCH16T245 at 0 V supply?

The SN74AVCH16T245 guarantees an Ioff current of ≤ ±5 µA when either VCCA or VCCB is at 0 V and all inputs/outputs are biased within their absolute maximum ratings. This parameter is measured per Electrical Characteristics Table 7.5 and ensures safe operation during partial-power-down scenarios without risk of damaging backflow current.