Texas Instruments 74LVC16T245DGGRE4

Overview

74LVC16T245 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver with configurable level-shifting between 1.65 V and 5.5 V rails, tri-state outputs, and VCC isolation. It enables bidirectional data translation between mismatched voltage domains (e.g., 1.8-V ↔ 3.3-V or 3.3-V ↔ 5-V), supports partial-power-down via Ioff, and operates across industrial temperature range (–40°C to +85°C). Used in mixed-voltage system interconnects requiring direction-controlled data flow.

For engineers reviewing the 74LVC16T245 datasheet, 74LVC16T245 pinout, 74LVC16T245 application, or 74LVC16T245 equivalent, key selection criteria include dual-rail supply flexibility (VCCA/VCCB = 1.65–5.5 V), guaranteed high-impedance state during power sequencing, Ioff compliance for hot-insertion, and verified timing performance up to 200 MHz in 3.3-V-to-5-V configurations.

Technical Context

The 74LVC16T245 implements two independent 8-bit transceiver channels (1A↔1B and 2A↔2B), each controlled by dedicated DIR and OE inputs referenced to VCCA. Direction control 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.

VCC isolation ensures that if either VCCA or VCCB drops to GND, all I/Os enter high-impedance-preventing bus contention or false logic injection. Input circuits remain active at all times; floating data pins must be externally terminated to VCCA or GND to avoid excessive ICCZ and ensure stable operation.

Key Specifications

Pinout & Package

TSSOP-48 package (12.50 mm × 6.10 mm body size) with exposed pad not electrically connected. Pin numbering follows standard top-view layout with 1A1 at pin 47 and 2OE at pin 25.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH16T245 and TXB0108PWR, the 74LVC16T245 uniquely balances wide voltage range (1.65–5.5 V), guaranteed VCC isolation, and explicit DIR/OE control - making it optimal for industrial backplanes and automotive gateways where power-domain independence and fault containment are mandatory.

Availability

74LVC16T245 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and enterprise server applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 74LVC16T245 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 delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.

The 74LVC16T245 belongs to TI's LVC logic family, engineered specifically for low-voltage mixed-signal system interfacing - emphasizing robust level translation, power-domain isolation, and compatibility with modern energy-efficient SoCs and FPGAs.

FAQ

What voltage ranges does the 74LVC16T245 support on its A and B ports?

The 74LVC16T245 supports 1.65 V to 5.5 V on both VCCA (A port) and VCCB (B port) rails independently. This allows translation between any combination of common logic voltages - including 1.8-V ↔ 2.5-V, 2.5-V ↔ 3.3-V, and 3.3-V ↔ 5-V - without external components. Each port's I/O structure is referenced to its respective supply, ensuring correct threshold tracking across the full range.

How does the VCC isolation feature work in the 74LVC16T245?

The VCC isolation feature in the 74LVC16T245 guarantees that if either VCCA or VCCB drops to GND, both A and B ports immediately enter a high-impedance state - regardless of DIR or OE states. This prevents bus contention, false logic injection, or latch-up during power-up/down sequences or rail failures. The behavior is inherent to the silicon design and requires no external circuitry.

Can the 74LVC16T245 be used in hot-swap applications?

Yes, the 74LVC16T245 supports hot-swap operation via its Ioff specification: when either VCCA or VCCB is at GND, the off-state leakage current is limited to ±1 μA maximum. This prevents damaging backflow current through powered I/Os of connected devices. For reliable hot-swap, OE should be held high (via pullup to active VCCA) until both supplies are stable.

What is the maximum data rate supported by the 74LVC16T245?

The 74LVC16T245 supports data rates up to 200 MHz in specific configurations - for example, with VCCA = 3.3 V and VCCB = 5 V, the maximum frequency is determined by the worst-case propagation delay (tPLH/tPHL ≤ 6.1 ns). Actual achievable rate depends on load capacitance, termination, and signal integrity; TI characterizes switching performance across VCCA/VCCB combinations in Sections 7.6–7.9 of the datasheet.

Are unused input pins on the 74LVC16T245 required to be terminated?

Yes, all unused data I/O pins (1A1–1A8, 1B1–1B8, 2A1–2A8, 2B1–2B8) on the 74LVC16T245 must be externally tied to VCCA or GND. Floating CMOS inputs cause increased ICCZ, potential oscillation, and unpredictable output states. Control inputs (1DIR, 2DIR, 1OE, 2OE) should also be actively driven - OE is commonly pulled up to VCCA via a resistor to ensure default high-impedance on power-up.