Texas Instruments 74AVCH16T245ZQLR

Overview

74AVCH16T245 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver with configurable level-shifting, tri-state outputs, VCC isolation, and bus-hold circuitry. It enables bidirectional voltage translation between 1.2 V–3.6 V domains (e.g., 1.8 V ↔ 3.3 V), supports up to 380 Mbps data rate, and features Ioff for partial-power-down operation. It is used in mixed-voltage system interconnects such as processor-to-peripheral bridges in embedded controllers.

For engineers reviewing the 74AVCH16T245 datasheet, 74AVCH16T245 pinout, 74AVCH16T245 application, or 74AVCH16T245 equivalent, key selection criteria include dual-rail supply independence (VCCA/VCCB = 1.2–3.6 V), 4.6 V I/O tolerance, guaranteed high-impedance during power sequencing, bus-hold elimination of external resistors, and verified 380 Mbps performance at 1.8 V → 3.3 V translation.

Technical Context

The 74AVCH16T245 implements two independent 8-bit transceivers (1A↔1B and 2A↔2B), each controlled by dedicated DIR and OE inputs referenced to VCCA. Its fully configurable dual-rail architecture allows asymmetric operation - e.g., VCCA = 1.8 V while VCCB = 3.3 V - with input thresholds dynamically tracking their respective supply rails.

VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB is at GND, preventing backdrive during power-up/down. The integrated bus-hold circuit sustains valid logic states on undriven A/B inputs without external pull resistors, and Ioff limits leakage to ±5 µA per port when powered down.

Key Specifications

Pinout & Package

74AVCH16T245 is packaged in a 48-pin ZQL (TVSOP) package measuring 9.70 mm × 4.40 mm with 0.4 mm pitch, optimized for space-constrained PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH16T245DGGR, the ZQL variant offers superior board density and fine-pitch compatibility; versus SN74LVC16T245, it delivers essential dual-rail control, VCC isolation, and overvoltage resilience required for modern heterogeneous voltage architectures.

Availability

74AVCH16T245 is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive infotainment subsystems, and FPGA-based test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 74AVCH16T245 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 solutions, with decades of expertise in logic, interface, and power management ICs.

The SN74AVCH16T245 belongs to TI's advanced voltage translation logic family, designed specifically for reliable, high-speed interconnection between heterogeneous voltage domains in space-constrained, thermally demanding embedded systems.

FAQ

What voltage ranges does the 74AVCH16T245 support on its A and B ports?

The 74AVCH16T245 supports independent supply voltages from 1.2 V to 3.6 V on both VCCA and VCCB. This allows translation between any combination of low-voltage nodes - including 1.2 V ↔ 1.5 V, 1.8 V ↔ 2.5 V, and 1.8 V ↔ 3.3 V - with full functionality and guaranteed timing across the entire range. The 74AVCH16T245 datasheet specifies operation down to 1.2 V, making it suitable for ultra-low-power applications.

Does the 74AVCH16T245 require external pullup or pulldown resistors?

No, the 74AVCH16T245 integrates active bus-hold circuitry on all 32 I/O pins (1A1–1A8, 1B1–1B8, 2A1–2A8, 2B1–2B8), which maintains unused or undriven inputs at valid logic levels without external components. Using pullup or pulldown resistors with the 74AVCH16T245 is explicitly discouraged in the datasheet, as it may interfere with bus-hold operation and increase power consumption.

How does the VCC isolation feature work in the 74AVCH16T245?

The VCC isolation feature in the 74AVCH16T245 ensures that if either VCCA or VCCB is driven to GND (e.g., during power-down or fault), both A and B ports automatically enter a high-impedance state - effectively isolating the buses. This behavior is hardware-enforced and requires no external control, preventing false logic levels or backdrive current. It is a key reliability feature confirmed in the 74AVCH16T245 electrical characteristics table under IOZ specifications.

What is the maximum data rate supported by the 74AVCH16T245?

The 74AVCH16T245 supports up to 380 Mbps when translating from 1.8 V to 3.3 V (VCCA = 1.8 V, VCCB = 3.3 V). Performance varies with voltage combinations: 200 Mbps for <1.8 V → 3.3 V or level-shifting to 2.5 V/1.8 V, 150 Mbps to 1.5 V, and 100 Mbps to 1.2 V. These values are measured and guaranteed in the 74AVCH16T245 switching characteristics tables across temperature and voltage conditions.

Is the 74AVCH16T245 compatible with partial-power-down operation?

Yes, the 74AVCH16T245 is fully specified for partial-power-down applications using its Ioff circuitry. When either VCCA or VCCB is at GND, the Ioff feature limits leakage current to ±5 µA per port (max) over –40°C to 85°C, preventing damaging backflow current through powered-down sections of the system. This capability is validated and documented in the 74AVCH16T245 absolute maximum ratings and electrical characteristics sections.