Texas Instruments SN74AVC16T245DGGR

Overview

SN74AVC16T245 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver enabling bidirectional voltage translation between 1.2V–3.6V domains. It features independent A-port (VCCA-referenced) and B-port (VCCB-referenced) rails, tri-state outputs controlled by 1OE/2OE, and direction control via 1DIR/2DIR. Used in mixed-voltage system interconnects such as 1.8V processor-to-3.3V peripheral interfaces.

For engineers reviewing the SN74AVC16T245 datasheet, SN74AVC16T245 pinout, SN74AVC16T245 application, or SN74AVC16T245 equivalent, key selection criteria include VCCA/VCCB supply flexibility (1.2V–3.6V), Ioff partial-power-down support, VCC isolation behavior, 4.6V I/O tolerance, and maximum 380Mbps data rate for 1.8V→3.3V level-shifting.

Technical Context

The SN74AVC16T245 implements a fully configurable dual-rail architecture where each port operates independently across 1.2V–3.6V, with control inputs (DIR, OE) referenced solely to VCCA. Its logic-level translation relies on rail-referenced input thresholds and output drive strength scaled to the respective VCC supply.

VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB = GND, preventing bus contention during power sequencing. Ioff circuitry disables outputs during partial power-down, blocking damaging backflow current when one supply is inactive while the other remains powered.

Key Specifications

Pinout & Package

TSSOP-48 package (12.50 mm × 6.10 mm), lead pitch 0.5 mm, body height 1.2 mm. Pin 1 marked by beveled corner; pins arranged in two 24-pin rows.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH16T245, the SN74AVC16T245 omits bus-hold for lower static current and reduced input capacitance; versus TXB0108PWR, it provides deterministic direction control, full 16-bit width, and 380Mbps performance - making it optimal for high-bandwidth, multi-channel synchronous interconnects.

Availability

SN74AVC16T245 is available at Aetrix Electronics and suitable for industrial I/O modules, automotive infotainment baseband interfaces, and multi-voltage memory subsystems requiring stable component supply and long-term lifecycle assurance.

Supply support for SN74AVC16T245 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 delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and enterprise applications.

The SN74AVC16T245 belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered specifically for high-speed, low-voltage bidirectional level translation in mixed-supply digital systems.

FAQ

What supply voltage ranges does the SN74AVC16T245 support on its A and B ports?

The SN74AVC16T245 supports independent supply voltages from 1.2V to 3.6V on both VCCA (A port) and VCCB (B port). This allows translation between any combination of standard low-voltage nodes including 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V. The device remains fully operational even when VCCA and VCCB differ - for example, 1.8V on A and 3.3V on B - with no external components required.

How does the VCC isolation feature function in the SN74AVC16T245?

The VCC isolation feature in the SN74AVC16T245 ensures that if either VCCA or VCCB is driven to GND (e.g., during power-down), both A and B ports automatically enter a high-impedance state. This prevents false logic levels or contention on either bus, eliminating the need for external power-sequencing controls. The behavior is intrinsic to the silicon design and requires no configuration or external circuitry.

What is the maximum data rate supported by the SN74AVC16T245, and under what conditions?

The SN74AVC16T245 achieves a maximum data rate of 380Mbps when translating from 1.8V to 3.3V (VCCA = 1.8V, VCCB = 3.3V). Lower rates apply for other combinations: 200Mbps for sub-1.8V to 3.3V, 200Mbps to 2.5V or 1.8V, 150Mbps to 1.5V, and 100Mbps to 1.2V. These values reflect guaranteed AC switching characteristics under recommended operating conditions.

Does the SN74AVC16T245 support partial-power-down operation, and how is it implemented?

Yes, the SN74AVC16T245 fully supports partial-power-down operation via its Ioff specification. When either VCCA or VCCB is at 0V while the other remains powered, the Ioff circuitry disables all I/O output drivers, limiting leakage current to ±5μA maximum. This prevents damaging backflow current through the device - a critical requirement for hot-plug, PCIe, and USB-compliant designs where supplies may be sequenced independently.

Can unused input pins on the SN74AVC16T245 be left floating, and what is the recommended practice?

No, unused input pins on the SN74AVC16T245 must not be left floating. Floating CMOS inputs can cause excessive internal leakage, increased power consumption, and unpredictable logic states. TI recommends tying all unused data inputs directly to VCCI (supply for that port) or GND. Control inputs (DIR, OE) should be actively driven or pulled to valid logic levels using appropriate resistors - for example, OE tied to VCCA via a pullup to ensure tri-state on power-up.