onsemi 74ALVC16245DT

Overview

74ALVC16245DT from onsemi is a low-voltage, non-inverting 16-bit bidirectional transceiver with 3-state outputs, designed for high-speed data bus interfacing in 1.65–3.6 V systems. It features byte-level control (two independent octal sections), 3.6 V-tolerant I/O, and supports live insertion/withdrawal. Typical applications include memory expansion interfaces in industrial controllers and FPGA-to-ASIC data bridging.

For engineers reviewing the 74ALVC16245DT datasheet, pinout, applications, or equivalent options, key selection criteria include voltage compatibility (1.65–3.6 V operation), 3.6 V-tolerant I/O for mixed-supply interconnects, propagation delay ≤3.0 ns at 3.0–3.6 V, static drive capability up to 24 mA, and TSSOP-48 package footprint constraints.

Technical Context

The 74ALVC16245DT implements dual independent 8-bit transceiver channels controlled by separate OE1/T/R1 and OE2/T/R2 inputs. Direction control is active-HIGH for transmit (A→B) and active-LOW for receive (B→A), enabling flexible bidirectional data flow per byte group. Output enable is active-HIGH, placing both A and B ports in high-impedance state when asserted.

It incorporates IOFF circuitry ensuring high-impedance outputs during power-off (VCC = 0 V), critical for hot-swap systems. Static supply current is limited to 40 µA across all logic states, and latch-up immunity exceeds 250 mA at 125°C per JESD78 testing.

Key Specifications

Pinout & Package

TSSOP-48 package (Case 1201), 12.5 mm × 6.1 mm body, 0.5 mm pitch, exposed pad not present, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit transceiver applications.

Compared with SN74ALVC16245DGGR, the 74ALVC16245DT offers identical performance and pinout but differs in manufacturer qualification and traceability; versus 74LVC16245APAG, it adds IOFF for safe hot-plug operation and uses a smaller TSSOP footprint ideal for space-constrained industrial modules.

Availability

74ALVC16245DT is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA-to-microcontroller bridges, hot-swappable sensor hubs, and legacy bus adaptation requiring stable component supply and long-term lifecycle support.

Supply support for 74ALVC16245DT 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The 74ALVC16245DT belongs to the ALVC (Advanced Low-Voltage CMOS) logic family, engineered for high-speed, low-power bidirectional data transfer in mixed-voltage embedded systems with stringent reliability and thermal requirements.

FAQ

What voltage levels does the 74ALVC16245DT support for VCC operation?

The 74ALVC16245DT operates over a VCC range of 1.65 V to 3.6 V, with guaranteed performance at 1.8 V, 2.5 V, and 3.3 V nominal supplies. This allows seamless integration into multi-rail systems without external regulators or level shifters. The device maintains specified propagation delay, drive strength, and noise margins across this full range, as verified in the onsemi datasheet Rev. 1 section "Recommended Operating Conditions".

Does the 74ALVC16245DT support hot-swap or live-insertion applications?

Yes, the 74ALVC16245DT supports live insertion and withdrawal per its datasheet. Its IOFF specification guarantees high-impedance outputs when VCC = 0 V, preventing back-powering of inactive subsystems. Combined with 3.6 V-tolerant I/O and robust ESD protection (>2000 V HBM), it is qualified for use in modular backplanes and field-replaceable units where cards are inserted or removed under power.

How is direction control implemented on the 74ALVC16245DT?

Direction control on the 74ALVC16245DT is managed per byte group using two Transmit/Receive (T/R1 and T/R2) inputs. T/R1 controls A0–A7 ↔ B0–B7; T/R2 controls A8–A15 ↔ B8–B15. When T/Rn is HIGH, data flows from A to B; when LOW, data flows from B to A. This byte-level granularity enables independent arbitration of upper and lower data bus segments in complex memory or peripheral interfaces.

What is the maximum propagation delay for the 74ALVC16245DT at 3.3 V operation?

At VCC = 3.0 V to 3.6 V, the maximum propagation delay (tPLH/tPHL) for the 74ALVC16245DT is 3.0 ns, measured under AC conditions with CL = 30 pF and RL = 500 Ω. This value applies across the full operating temperature range (−40°C to +85°C) and ensures reliable timing closure in high-speed parallel bus designs such as SRAM interfaces or FPGA glue logic.

Can the 74ALVC16245DT interface directly with 5 V logic devices?

No, the 74ALVC16245DT does not support 5 V logic levels. Its inputs and outputs are rated for 3.6 V maximum, and VCC must remain within 1.65–3.6 V. While 3.6 V-tolerant I/O allows safe connection to 3.3 V peripherals, interfacing with true 5 V TTL or CMOS requires external level-shifting circuitry. The device is not 5 V-tolerant, and applying 5 V to any pin may exceed absolute maximum ratings and cause permanent damage.