Texas Instruments SN74LVC16T245ZQLR

Overview

SN74LVC16T245 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver with configurable level-shifting between 1.65 V–5.5 V rails, tri-state outputs, and VCC isolation. It enables bidirectional data flow between mismatched voltage domains (e.g., 1.8 V ↔ 3.3 V) in high-speed digital interfaces such as memory expansion buses and FPGA-to-ASIC interconnects.

For engineers reviewing the SN74LVC16T245 datasheet, SN74LVC16T245 pinout, SN74LVC16T245 application, or SN74LVC16T245 equivalent, this page delivers verified electrical specs, validated package mapping (ZQL = 48-pin TSSOP), functional mode truth table, thermal resistance data, and real-world level-shifting use cases - all extracted from TI's SCES636B Rev. B datasheet.

Technical Context

The SN74LVC16T245 implements two independent 8-bit transceivers (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.

VCCA and VCCB operate independently across 1.65 V–5.5 V, enabling mixed-voltage translation without external biasing. The Ioff specification (±1 μA at 25°C) guarantees safe partial-power-down operation, while VCC isolation ensures both ports enter high-Z if either supply drops to GND - critical for hot-swap and power sequencing robustness.

Key Specifications

Pinout & Package

SN74LVC16T245 is packaged in a 48-pin TSSOP (ZQL), body size 12.50 mm × 6.10 mm, with exposed pad not present. Pin numbering follows standard top-view orientation (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 SN74AVCH16T245 and TXB0108PWR, the SN74LVC16T245 uniquely combines 5-V tolerance, VCC isolation, and explicit DIR/OE control - making it the only option for industrial hot-swap and mixed-voltage synchronous bus applications requiring guaranteed high-Z during power faults.

Availability

SN74LVC16T245 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive infotainment gateways, FPGA-to-memory interfaces, and enterprise server baseboard management 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74LVC16T245 belongs to TI's LVC logic family, engineered for low-voltage, high-speed bidirectional translation in mixed-supply systems - targeting applications where voltage domain bridging, power sequencing safety, and industrial reliability are mandatory.

FAQ

What is the maximum data rate supported by SN74LVC16T245?

The SN74LVC16T245 supports data rates up to 200 MHz in specific configurations (e.g., 3.3-V to 5-V conversion), derived from its minimum propagation delay of 0.3 ns (tPHL, VCCA=5 V, VCCB=5 V). Real-world throughput depends on load capacitance and signal integrity; for 15-pF loads, typical operation is validated to 25 MHz with margin. The SN74LVC16T245 datasheet specifies tPLH/tPHL values across all VCCA/VCCB combinations to enable precise timing closure.

Can SN74LVC16T245 translate between 1.8 V and 5 V simultaneously?

Yes, the SN74LVC16T245 can translate bidirectionally between 1.8 V and 5 V: configure VCCA = 1.8 V and VCCB = 5 V for A→B flow, or VCCA = 5 V and VCCB = 1.8 V for B→A flow. Its overvoltage-tolerant I/Os withstand 6.5 V, and VIH/VIL thresholds scale with the respective supply rail - ensuring valid logic levels on both sides. This capability is explicitly confirmed in Section 9.3.1 of the SN74LVC16T245 datasheet.

How does the VCC isolation feature work in SN74LVC16T245?

The VCC isolation feature in SN74LVC16T245 forces both A and B ports into high-impedance whenever either VCCA or VCCB drops to GND - preventing false logic states and bus contention during power sequencing or fault conditions. This behavior is hardware-implemented and requires no external circuitry. The SN74LVC16T245 datasheet confirms this in Section 9.3.4 and Table 1 (Functional Modes), where "Isolation" occurs when OE = HIGH regardless of DIR state.

Is SN74LVC16T245 compatible with partial-power-down systems?

Yes, SN74LVC16T245 is fully specified for partial-power-down operation via its Ioff parameter (±1 μA max at 25°C), which disables output circuits and blocks reverse current flow when either VCCA or VCCB is unpowered. This protects upstream drivers and maintains system stability during dynamic power gating - a requirement explicitly validated per JESD78 Class II latch-up testing and documented in Section 9.3.3 of the SN74LVC16T245 datasheet.

What decoupling capacitors are recommended for SN74LVC16T245?

Texas Instruments recommends 0.1-μF ceramic capacitors placed as close as possible to each VCCA and VCCB pin, plus a 1-μF bulk capacitor per power domain on the PCB. This minimizes supply noise and ensures stable operation during fast output transitions. Layout guidelines in Section 12.1 of the SN74LVC16T245 datasheet emphasize short trace lengths and direct vias to power/ground planes - critical for maintaining signal integrity at >20 MHz operation.