Texas Instruments SN74AVC16T245DGG

Overview

SN74AVC16T245 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver with configurable level-shifting, tri-state outputs, and independent A/B port voltage rails (VCCA/VCCB = 1.2 V to 3.6 V). It enables bidirectional data translation between mismatched voltage domains-e.g., 1.8 V microcontroller to 3.3 V peripheral-with up to 380 Mbps throughput (1.8 V → 3.3 V), Ioff partial-power-down support, and VCC isolation.

For engineers reviewing the SN74AVC16T245 datasheet, SN74AVC16T245 pinout, SN74AVC16T245 application, or SN74AVC16T245 equivalent, key selection considerations include its dual-rail supply flexibility, 4.6 V I/O tolerance, guaranteed high-impedance state during power sequencing, ESD robustness (±8 kV HBM), and TSSOP-48 package compatibility with dense PCB layouts.

Technical Context

The SN74AVC16T245 implements asynchronous bidirectional level translation using two independent supply domains: VCCA powers the A-port I/Os and control inputs (1DIR, 2DIR, 1OE, 2OE), while VCCB powers the B-port I/Os. Direction control is managed by DIR pins referenced to VCCA, enabling A→B or B→A data flow depending on logic level.

Its VCC isolation feature forces both ports into high-impedance when either VCCA or VCCB is at GND, preventing bus contention during power-up/down. The Ioff specification ensures no damaging backflow current when one supply is powered down while the other remains active.

Key Specifications

Pinout & Package

TSSOP-48 package (DGG suffix): 12.50 mm × 6.10 mm body size, 0.5 mm pitch, surface-mount, lead-free and RoHS compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH16T245 and TXB0108PWR, the SN74AVC16T245 delivers optimal balance of channel count, speed, and design simplicity for fixed-direction, high-throughput 16-bit interconnects-without bus-hold overhead or auto-sensing latency penalties.

Availability

SN74AVC16T245 is available at Aetrix Electronics and suitable for industrial PLC backplanes, enterprise SSD controllers, telecom baseband processors, and personal electronics SoC expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

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, with over 90 years of innovation in precision analog, power management, and interface ICs.

The SN74AVC16T245 belongs to TI's AVC advanced CMOS logic family, engineered specifically for low-voltage, high-speed bidirectional level translation in multi-rail digital systems where power sequencing, noise immunity, and timing predictability are critical.

FAQ

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

The SN74AVC16T245 supports independent supply voltages from 1.2 V to 3.6 V on both VCCA (A port) and VCCB (B port), enabling translation between any pair of standard low-voltage nodes-including 1.2 V ↔ 1.5 V, 1.8 V ↔ 2.5 V, and 1.8 V ↔ 3.3 V-without external components. Each port's I/Os are referenced strictly to their respective supply rail.

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 regardless of DIR or OE states. This prevents false logic levels or bus contention when power rails are sequenced asymmetrically-a critical safeguard in complex multi-supply systems.

Can the SN74AVC16T245 operate with mismatched supply voltages such as 1.2 V on VCCA and 3.3 V on VCCB?

Yes, the SN74AVC16T245 is explicitly designed for mismatched supply operation: VCCA and VCCB may differ by up to 2.1 V (e.g., 1.2 V and 3.3 V). Its overvoltage-tolerant I/Os (rated to 4.6 V) and level-shifted control inputs (VIH/VIL referenced to VCCA) guarantee reliable operation and timing compliance across all supported combinations per TI's switching characterization data.

What is the maximum guaranteed data rate for the SN74AVC16T245 in 1.8 V to 3.3 V translation mode?

The SN74AVC16T245 guarantees up to 380 Mbps in 1.8 V ↔ 3.3 V level-shifting mode, as specified in the datasheet's "Maximum Data Rates" table. This performance is validated under worst-case conditions (TA = 85 °C, CL = 15 pF) and aligns with measured tPLH/tPHL values ≤3.2 ns at VCCA = VCCB = 3.3 V.

Does the SN74AVC16T245 require external pull-up or pull-down resistors on unused inputs?

Yes-per TI's recommended operating conditions, all unused data inputs (A or B port) must be held at VCCI or GND to prevent floating nodes, which can cause excessive leakage and erratic behavior in CMOS inputs. Control inputs (DIR, OE) should be actively driven; OE is commonly tied to VCCA via a pull-up resistor to ensure high-impedance state during power-up.