Nexperia USA Inc. 74ALVCH16843DGGS

Overview

74ALVCH16843DGGS from Nexperia is an 18-bit bus-interface D-type latch with dual 9-bit sections, 3-state non-inverting outputs, active bus hold on all data inputs, and independent latch enable (nLE), clear (nCLR), preset (nPRE), and output enable (nOE) controls. It operates from 1.2 V to 3.6 V, delivers ±24 mA drive at VCC = 3.0 V, and is specified for -40 °C to +85 °C industrial temperature range.

For engineers reviewing the 74ALVCH16843DGGS datasheet, 74ALVCH16843DGGS pinout, 74ALVCH16843DGGS application, or 74ALVCH16843DGGS equivalent, this device serves as a high-density, low-voltage bus latch for memory address/data buffering, backplane interface isolation, and hot-swap I/O expansion where bus contention avoidance and floating-input immunity are critical.

Technical Context

The 74ALVCH16843DGGS implements two independent 9-bit D-type latches with asynchronous active-low clear (nCLR) and preset (nPRE), synchronous active-high latch enable (nLE), and active-low 3-state output enable (nOE). Each latch section operates transparently when nLE is HIGH and holds data when nLE is LOW - output state remains unaffected by nOE transitions.

Its integrated bus hold circuitry maintains valid logic levels on all 18 data inputs without external pull resistors, supporting robust operation in unterminated or high-impedance bus environments. The TSSOP56 package features multiple VCC/GND pins to minimize ground bounce and supply noise during simultaneous switching of up to 18 outputs.

Key Specifications

Pinout & Package

TSSOP56 (SOT364-1) package: plastic thin shrink small outline, 56 leads, 6.1 mm body width, 0.5 mm lead pitch, 1.2 mm max height. Features 8 GND and 4 VCC pins distributed across the package for low-inductance power delivery and noise suppression.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 18-bit bus latch applications.

Compared with SN74ALVTH16835DGGR and 74LVC16373APAG, the 74ALVCH16843DGGS uniquely combines 18-bit width, dual-section independent control, full bus hold, and ultra-low static current - making it optimal for industrial backplane and memory interface designs demanding robustness and pin compatibility.

Availability

74ALVCH16843DGGS is available at Aetrix Electronics and suitable for memory address latching, backplane bus isolation, and hot-swap I/O expansion requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial temperature performance.

Supply support for 74ALVCH16843DGGS 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 bus interface applications, emphasizing noise immunity, power efficiency, and JEDEC-compliant interoperability across mixed-supply systems.

FAQ

What is the function of the bus hold circuitry on the 74ALVCH16843DGGS?

The bus hold circuitry actively maintains valid logic HIGH or LOW states on all 18 data inputs when they are floating or unterminated, eliminating the need for external pull-up or pull-down resistors. It draws 75–150 μA when holding LOW and −75 to −175 μA when holding HIGH at VCC = 3.0 V, ensuring robust operation in high-impedance bus environments without increasing board area or BOM cost.

Can the 74ALVCH16843DGGS operate with a 1.8 V supply?

Yes - the 74ALVCH16843DGGS is fully specified for 1.2 V to 3.6 V operation. At 1.8 V, it meets all recommended operating conditions including VIH/VIL thresholds, propagation delay (≤4.3 ns), and output drive capability. Static current remains below 40 μA, and bus hold functions reliably across the full voltage range.

How are the latch enable (nLE) and output enable (nOE) signals related in timing behavior?

nLE controls data capture (HIGH = transparent, LOW = hold), while nOE controls output driver state (LOW = active, HIGH = high-impedance). These functions are fully decoupled: changing nOE does not affect internal latch state or timing, and nLE transitions do not force output state changes. This allows independent control of data sampling and bus release - critical for glitch-free bus arbitration.

Does the 74ALVCH16843DGGS support hot-swap applications?

Yes - its combination of bus hold (prevents undefined inputs during insertion), 3-state outputs (enables safe disconnection), and robust ESD protection (HBM > 2000 V) makes it suitable for hot-swap I/O expansion. The TSSOP56 package's distributed power/ground pins further enhance noise immunity during live insertion, and the −40 °C to +85 °C rating ensures reliability in uncontrolled chassis environments.