Texas Instruments SN74LVC16T245DGGR

Overview

SN74LVC16T245 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver with configurable level-shifting, supporting bidirectional voltage translation between 1.65 V–5.5 V domains (e.g., 1.8 V ↔ 3.3 V or 3.3 V ↔ 5 V). It features independent A- and B-port supplies (VCCA/VCCB), tri-state outputs controlled by DIR/OE inputs, and Ioff partial-power-down protection. Used in mixed-voltage system interconnects such as processor-to-peripheral data buses.

For engineers reviewing the SN74LVC16T245 datasheet, SN74LVC16T245 pinout, SN74LVC16T245 application, or SN74LVC16T245 equivalent, key selection criteria include dual-rail supply flexibility, guaranteed high-impedance isolation during power sequencing, VCC isolation behavior, Ioff compliance for hot-insertion, and verified 16-bit channel-level direction control per port pair.

Technical Context

The SN74LVC16T245 implements two independent 8-bit transceiver blocks (1A/1B and 2A/2B), each with dedicated DIR and OE controls referenced to VCCA. Direction logic is asynchronous: DIR = HIGH enables A→B transmission; DIR = LOW enables B→A transmission. OE = HIGH forces both ports into high-impedance regardless of DIR state.

VCCA powers all control inputs (1DIR, 2DIR, 1OE, 2OE) and A-port I/Os; VCCB powers B-port I/Os. The VCC isolation feature guarantees that if either VCCA or VCCB is at GND, both ports enter high-impedance - preventing bus contention during power-up/down. Ioff limits reverse current to ±2 µA when either supply is at 0 V.

Key Specifications

Pinout & Package

TSSOP-48 package (12.50 mm × 6.10 mm); 48-pin surface-mount with exposed thermal pad (not electrically connected). Pin numbering follows standard TSSOP top-view convention (Pin 1 at top-left corner, counterclockwise).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional voltage translation applications.

Compared with SN74AVCH16T245 and TXB0108PWR, the SN74LVC16T245 uniquely balances wide voltage coverage (1.65–5.5 V), guaranteed VCC isolation, and deterministic DIR-controlled operation - making it the only option qualified for mixed-voltage industrial backplanes requiring fail-safe power sequencing.

Availability

SN74LVC16T245 is available at Aetrix Electronics and suitable for industrial automation, automotive ADAS sensor fusion, enterprise storage controller design, and embedded computing applications requiring stable component supply and long-term lifecycle support.

Supply support for SN74LVC16T245 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 experience in interface IC design and automotive/industrial qualification.

The SN74LVC16T245 belongs to TI's LVC logic family - engineered for robust mixed-voltage system interconnects in harsh environments, emphasizing supply flexibility, power sequencing resilience, and ESD-hardened I/O structures.

FAQ

What voltage ranges does the SN74LVC16T245 support on its A and B ports?

The SN74LVC16T245 supports independent supply voltages from 1.65 V to 5.5 V on both VCCA (A port) and VCCB (B port). This allows reliable bidirectional translation between any combination of common logic families - including 1.8 V ↔ 2.5 V, 2.5 V ↔ 3.3 V, 3.3 V ↔ 5 V, and even 1.8 V ↔ 5 V - without external components or configuration resistors. Each port's I/O thresholds scale with its respective supply.

How does the VCC isolation feature work in the SN74LVC16T245?

In the SN74LVC16T245, VCC isolation means that if either VCCA or VCCB drops to GND (e.g., during power-down), both A and B ports automatically enter high-impedance mode - regardless of DIR or OE states. This prevents false logic levels from propagating across the bus and avoids contention or latch-up in partially powered systems. The behavior is hardware-enforced and requires no firmware intervention.

Can the SN74LVC16T245 be used in hot-swap applications?

Yes - the SN74LVC16T245 is explicitly designed for hot-swap use via its Ioff specification: when either VCCA or VCCB is at 0 V, leakage current is limited to ±2 µA maximum. This prevents damaging backflow current through powered I/Os of connected devices. Combined with VCC isolation, it ensures safe insertion/removal in modular backplanes, docking stations, and field-replaceable units without system reset.

What is the maximum data rate supported by the SN74LVC16T245?

The SN74LVC16T245 supports data rates exceeding 200 MHz in matched-voltage configurations (e.g., 3.3 V ↔ 3.3 V), based on worst-case propagation delay of 4.2 ns (tPLH/tPHL at VCCA = 5 V, VCCB = 5 V). At mixed voltages (e.g., 1.8 V → 5 V), typical delay is 7.1 ns, supporting >100 MHz operation. Actual throughput depends on load capacitance, trace impedance, and signal integrity design.

Does the SN74LVC16T245 require external pull-up or pull-down resistors on DIR/OE pins?

Yes - TI recommends tying OE pins to VCCA via a pull-up resistor (value determined by driver sink strength) to guarantee high-impedance state during power-up/power-down. DIR pins may be driven directly from logic, but floating DIR is prohibited: unused DIR inputs must be tied to VCCA (for A→B default) or GND (for B→A default) to prevent excessive ICCZ and undefined bus states.