onsemi 74ALVCH16245DTR

Overview

74ALVCH16245DTR from onsemi is a low-voltage, non-inverting 16-bit bus transceiver with active bus-hold circuitry and dual-byte control. It operates across 1.65–3.6 V supply rails, supports bidirectional data flow via T/Rn inputs, and delivers ±24 mA drive at 3.0 V. Used in high-speed memory and peripheral interconnects between 3.3 V, 2.5 V, or 1.8 V domains.

For engineers reviewing the 74ALVCH16245DTR datasheet, pinout, applications, or equivalent options, key selection criteria include voltage tolerance (3.6 V), propagation delay (3.0 ns max at 3.3 V), bus-hold input retention, IOFF shutdown behavior, and TSSOP-48 package compatibility with dense PCB layouts.

Technical Context

The 74ALVCH16245DTR implements two independent 8-bit transceiver sections (A0–A7/B0–B7 and A8–A15/B8–B15), each controlled by dedicated OE and T/R pins. Direction control is asynchronous: T/R = HIGH enables A→B transfer; T/R = LOW enables B→A transfer.

Its bus-hold circuitry maintains valid logic states on unused inputs without external pull-ups, and the IOFF specification ensures high-impedance outputs when VCC = 0 V-critical for live insertion and hot-swap applications. Static supply current is limited to 40 µA in all three logic states.

Key Specifications

Pinout & Package

TSSOP-48 package (Case 1201), 12.5 mm × 6.1 mm footprint, 0.5 mm pitch, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH16245DGGR, the 74ALVCH16245DTR offers identical functionality and layout compatibility; versus 74LVC16245APAG, it adds critical bus-hold and wider voltage support-making it essential for uncontrolled input environments and multi-rail systems.

Availability

74ALVCH16245DTR is available at Aetrix Electronics and suitable for memory subsystems, peripheral isolation, hot-swap backplanes, and FPGA I/O expansion requiring stable component supply and long-term industrial availability.

Supply support for 74ALVCH16245DTR 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 focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and IoT applications.

The 74ALVCH16245DTR belongs to the ALVCH advanced low-voltage CMOS logic family, designed specifically for high-speed, low-power bidirectional bus interfacing in mixed-voltage embedded systems.

FAQ

What voltage levels does the 74ALVCH16245DTR support for reliable operation?

The 74ALVCH16245DTR operates reliably across a supply range of 1.65 V to 3.6 V, with guaranteed AC and DC performance at 1.8 V, 2.5 V, and 3.3 V nominal rails. Its 3.6 V tolerant inputs and outputs allow safe interfacing with higher-voltage logic without external clamping, making the 74ALVCH16245DTR ideal for mixed-supply system bridges.

How does the bus-hold feature in the 74ALVCH16245DTR eliminate external components?

The 74ALVCH16245DTR integrates active bus-hold circuitry on all A and B I/O pins, providing minimum 75 µA holding current at 2.3 V to maintain valid logic states on unused or floating inputs. This eliminates the need for external pull-up or pull-down resistors, reducing BOM cost and PCB space-key for compact designs where the 74ALVCH16245DTR serves as a bus interface.

Can the 74ALVCH16245DTR be used in hot-swap applications? What design features enable this?

Yes-the 74ALVCH16245DTR supports live insertion and withdrawal due to its IOFF specification: when VCC = 0 V, output leakage remains ≤10 µA, preventing back-powering of powered-down buses. Combined with bus-hold retention and ESD robustness (>2000 V HBM), these features make the 74ALVCH16245DTR suitable for modular backplane and pluggable module interfaces.

What is the maximum data rate supported by the 74ALVCH16245DTR based on its propagation delay?

With a maximum propagation delay of 3.0 ns at 3.0–3.6 V, the 74ALVCH16245DTR supports clean signal transitions up to ~300 MHz in point-to-point configurations (assuming 1–2 ns setup/hold margin). Real-world throughput depends on load capacitance and routing; the 74ALVCH16245DTR's 7 pF typical output capacitance helps maintain integrity in dense 16-bit bus layouts.

Does the 74ALVCH16245DTR require external pull-up resistors on its OE or T/R pins?

No-OE and T/R inputs are standard CMOS-compatible and do not require pull-ups for default state control. However, to ensure outputs enter high-impedance mode at power-up, onsemi recommends connecting OE pins to VCC via a pull-up resistor (value determined by sink capability of upstream driver). This guidance applies specifically to the 74ALVCH16245DTR's robust power-on behavior.