Texas Instruments 74LVCH16T245ZQLR

Overview

74LVCH16T245 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver with configurable level-shifting between 1.65 V–5.5 V domains, tri-state outputs, and independent A/B port voltage rails (VCCA/VCCB). It supports bidirectional data flow (A↔B) under DIR/OE control, features bus-hold on all I/Os, and enables mixed-voltage interconnect in FPGA-to-ASIC or microcontroller-to-peripheral interfaces.

For engineers reviewing the 74LVCH16T245 datasheet, 74LVCH16T245 pinout, 74LVCH16T245 application, or 74LVCH16T245 equivalent, this page delivers verified electrical specs (VOH/VOL, tPLH/tPHL), thermal metrics (RθJA = 82.5°C/W), Ioff partial-power-down behavior, VCC isolation logic, and real-world translation use cases across telecom, industrial, and enterprise systems.

Technical Context

The device implements two independent 8-bit transceiver banks (1A/1B and 2A/2B), each controlled by dedicated DIR/OE pins referenced to VCCA. Directional data flow is determined by DIR state (high = A→B, low = B→A) while OE asserts tri-state on both ports when high. Input circuitry remains active regardless of OE state, requiring defined logic levels on all I/Os to prevent excess ICCZ.

VCCA and VCCB operate independently across 1.65 V–5.5 V, enabling translation between 1.8 V, 2.5 V, 3.3 V, and 5 V nodes. Bus-hold circuitry sustains undriven inputs at valid logic states without external resistors, and Ioff limits backflow current during partial power-down when either VCC rail is at GND.

Key Specifications

Pinout & Package

74LVCH16T245 is packaged in a 48-pin TVSOP (9.70 mm × 4.40 mm) with exposed pad. Pin functions are validated per TI SCES635B Rev B (April 2015).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH16T245 and TXB0108, the 74LVCH16T245 uniquely combines 16-bit dual-bank control, integrated bus-hold, VCC isolation, and Ioff - making it the only option for robust, manually directed translation in industrial backplanes and telecom line cards where power sequencing and floating inputs are uncontrolled.

Availability

74LVCH16T245 is available at Aetrix Electronics and suitable for industrial PLC backplanes, enterprise server memory subsystems, telecom line cards, and personal electronics USB interfaces requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for 74LVCH16T245 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, with leadership in interface, power management, and signal chain technologies.

The 74LVCH16T245 belongs to TI's LVCH logic family, engineered specifically for robust mixed-voltage system integration in industrial automation, telecom infrastructure, and enterprise computing where reliability under asymmetric power conditions is critical.

FAQ

What voltage ranges does the 74LVCH16T245 support on its A and B ports?

The 74LVCH16T245 supports 1.65 V to 5.5 V independently on both VCCA (A port) and VCCB (B port). This allows translation between any combination of 1.8 V, 2.5 V, 3.3 V, and 5 V logic families. The control inputs (1DIR, 2DIR, 1OE, 2OE) are referenced to VCCA, so VCCA must be present for functional operation of the 74LVCH16T245.

How does the VCC isolation feature work in the 74LVCH16T245?

The VCC isolation feature ensures that if either VCCA or VCCB is driven to GND, all outputs enter a high-impedance state regardless of DIR or OE states. This prevents false logic levels or bus contention during power-up/down sequencing. The 74LVCH16T245 achieves this via internal circuitry that monitors both supplies and disables output drivers when either rail collapses - a key safety mechanism in modular systems.

Does the 74LVCH16T245 require external pullup or pulldown resistors on its I/O pins?

No. The 74LVCH16T245 integrates active bus-hold circuitry on all 32 I/O pins (1A1–1A8, 1B1–1B8, 2A1–2A8, 2B1–2B8), which maintains undriven inputs at valid logic states. Using external pull resistors with the 74LVCH16T245 is explicitly discouraged in the datasheet, as it conflicts with bus-hold operation and may increase power consumption or cause logic instability.

What is the maximum data rate supported by the 74LVCH16T245?

The 74LVCH16T245 supports up to 200 MHz in specific voltage combinations (e.g., 3.3 V → 5 V) based on its maximum propagation delay of 0.3 ns (tPLH/tPHL) under light load (CL = 15 pF). Real-world throughput depends on bus loading, slew rate, and VCCA/VCCB selection - for example, 1.8 V → 2.5 V translation yields ~100 MHz due to higher tPLH (≤9.2 ns). The 74LVCH16T245 datasheet provides switching characteristics tables for all common rail combinations.

Can the 74LVCH16T245 be used in partial-power-down applications?

Yes. The 74LVCH16T245 is fully specified for partial-power-down operation using its Ioff feature. When either VCCA or VCCB is at GND, the Ioff circuitry disables all I/O outputs, limiting leakage current to ±2 μA maximum. This prevents damaging backflow current into powered-down sections of the system - a requirement for hot-swap capable equipment and modular telecom line cards using the 74LVCH16T245.