Nexperia USA Inc. 74ALVCH16245DGG:11

Overview

74ALVCH16245DGG:11 from Nexperia is a 16-bit CMOS bus transceiver with dual 8-bit direction control (1DIR/2DIR), dual 3-state output enables (1OE/2OE), active bus hold on all data I/Os, and IOFF partial power-down protection. It operates from 1.2 V to 3.6 V, delivers ±24 mA drive at 3.0 V, and supports high-speed bidirectional data flow in memory expansion and microcontroller peripheral interfaces.

For engineers reviewing the 74ALVCH16245DGG:11 datasheet, 74ALVCH16245DGG:11 pinout, 74ALVCH16245DGG:11 application, or 74ALVCH16245DGG:11 equivalent, this device is selected for low-voltage bidirectional bus interfacing where bus hold eliminates external pull resistors, IOFF prevents backfeed during power sequencing, and TSSOP48 packaging enables high-density PCB layouts.

Technical Context

This transceiver implements two independent 8-bit bidirectional data paths, each with dedicated direction (DIR) and output enable (OE) controls. Schmitt-trigger inputs tolerate slow signal edges, and the integrated bus hold circuit maintains valid logic states on floating data pins without external components.

The IOFF feature disables outputs when VCC = 0 V, blocking damaging current flow between powered and unpowered system domains. All I/Os are overvoltage tolerant to 5.5 V only in the 74ALVC16245 variant - the 74ALVCH16245 variant does not support this rating.

Key Specifications

Pinout & Package

TSSOP48 (SOT362-1) package: plastic thin shrink small outline, 48 leads, 6.1 mm body width, 0.5 mm lead pitch, designed for fine-pitch surface-mount assembly and thermal performance in high-density boards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74ALVCH16245DGG:11, the 74ALVC16245DGG trades bus hold for 5 V input tolerance-critical for legacy interoperability-while the SN74LVC16245ADGGR offers TI-specific qualification and slightly narrower voltage range but requires external biasing for floating nodes.

Availability

74ALVCH16245DGG:11 is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA I/O expansion bridges, and microcontroller peripheral buses requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for 74ALVCH16245DGG:11 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74ALVCH series targets low-voltage, high-speed digital interfacing in space-constrained industrial and embedded systems, emphasizing bus integrity, power sequencing safety, and robust ESD performance.

FAQ

What is the purpose of the bus hold circuit in the 74ALVCH16245DGG:11?

The bus hold circuit actively maintains the last-valid logic state on all data I/O pins (1A0–1A7, 1B0–1B7, 2A0–2A7, 2B0–2B7) when those pins are un-driven or floating. It draws 75–150 μA for LOW and –75 to –175 μA for HIGH at VCC = 3.0 V, eliminating the need for external pull-up or pull-down resistors and preventing undefined logic states that could cause system glitches or increased power consumption.

How does IOFF functionality protect the device during partial power-down?

IOFF disables all outputs when VCC = 0 V, limiting OFF-state output current to ≤10 μA. This prevents potentially damaging reverse current flow from powered system domains (e.g., 3.3 V bus) into the unpowered transceiver, which is critical during hot-swap operations, power sequencing, or standby mode transitions in multi-rail systems.

Can the 74ALVCH16245DGG:11 interface directly with 5 V logic signals?

No - unlike the 74ALVC16245 variant, the 74ALVCH16245DGG:11 does not support 5.5 V-tolerant inputs. Its absolute maximum input voltage is VCC + 0.5 V. Applying 5 V signals to any input (including DIR or OE) when VCC ≤ 3.6 V violates limiting values and risks permanent damage. Use level-shifting circuitry or select the 74ALVC16245DGG for 5 V compatibility.

What is the significance of MULTIBYTE™ flow-through pinout architecture?

MULTIBYTE™ flow-through pinout arranges complementary I/O pairs (e.g., 1A0/1B0, 1A1/1B1) on opposite sides of the TSSOP48 package with minimal vertical offset. This enables straight, short PCB traces between transceiver and memory/peripheral devices, reducing signal skew, crosstalk, and layer transitions - directly improving timing margin and EMI performance in high-speed parallel bus designs.