Nexperia USA Inc. 74ALVCH16843DGG,11

Overview

74ALVCH16843DGG,11 from Nexperia is an 18-bit dual-section bus-interface D-type latch with independent 3-state control per section, operating from 1.2 V to 3.6 V supply, featuring bus hold on all data inputs and ±24 mA output drive at 3.0 V - used in high-density memory address/data bus buffering and bidirectional I/O isolation in industrial control backplanes.

For engineers reviewing the 74ALVCH16843DGG,11 datasheet, 74ALVCH16843DGG,11 pinout, 74ALVCH16843DGG,11 application, or 74ALVCH16843DGG,11 equivalent, key selection criteria include latch enable timing (2.0–2.3 ns propagation), bus hold current (±75 μA at 3.0 V), TSSOP56 thermal performance (500 mW max), and JEDEC JESD8B compliance for 2.7–3.6 V systems.

Technical Context

This device implements two independent 9-bit D-type latches, each with active-low clear (nCLR), active-low preset (nPRE), active-high latch enable (nLE), and active-low output enable (nOE). The latch sections operate synchronously only when nLE is HIGH; nOE controls 3-state output independently without affecting internal register state.

Bus hold circuitry maintains valid logic levels on all 18 data inputs (1D0–1D8, 2D0–2D8) without external resistors, with IBHL/IBHH currents of ±75–150 μA at 3.0 V. Propagation delays are specified across three voltage ranges: 2.3–2.7 V, 2.7 V, and 3.0–3.6 V - enabling precise timing closure in mixed-voltage board designs.

Key Specifications

Pinout & Package

TSSOP56 package (SOT364-1), 56-pin plastic thin shrink small outline, 6.1 mm body width, 0.5 mm pitch, 1.2 mm max height - optimized for high-density PCB layouts with low-inductance multiple VCC/GND pins to suppress ground bounce.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH16835DGGR, the 74ALVCH16843DGG,11 offers superior noise immunity via bus hold and lower static power, while 74LVC16373ADGG,118 trades bit count and control granularity for broader LVC-family compatibility - making the 74ALVCH16843DGG,11 optimal for new 18-bit industrial bus designs requiring robust floating-input handling and independent section control.

Availability

74ALVCH16843DGG,11 is available at Aetrix Electronics and suitable for industrial automation backplanes, programmable logic controller I/O modules, and automated test equipment requiring stable component supply across extended temperature and mixed-voltage operation.

Supply support for 74ALVCH16843DGG,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 leading semiconductor manufacturer headquartered in Nijmegen, Netherlands, specializing in high-performance logic, analog, and discrete components for industrial, automotive, and computing markets.

The 74ALVCH16843 belongs to Nexperia's advanced ALVCH logic family, engineered for low-voltage, high-speed bus interface applications with emphasis on noise immunity, power efficiency, and JEDEC-compliant interoperability in dense PCB environments.

FAQ

What is the minimum pulse width required on nLE for reliable latching?

The minimum nLE pulse width is 1.5 ns across all supply voltages (2.3–3.6 V), with typical value of 0.5 ns. This specification ensures robust sampling of data inputs even under fast-rising clock edges and marginal timing margins in high-speed bus systems.

Does the bus hold circuit activate automatically, and what voltage thresholds trigger it?

Bus hold activates automatically on all 18 data inputs without external configuration. It engages when input voltage falls within the indeterminate region - specifically, below VIH (e.g., <1.2 V at VCC = 2.5 V) or above VIL (e.g., >0.7 V at VCC = 2.5 V), maintaining the last valid logic state.

Can nPRE and nCLR be asserted simultaneously with nLE, and what is the resulting behavior?

Yes - nPRE and nCLR are asynchronous and override nLE. When both are asserted (LOW), the latch output goes to a defined state (HIGH for nPRE, LOW for nCLR); priority is not specified, so simultaneous assertion is discouraged. Functional table confirms NC (no change) only when both are HIGH.

How does the device behave during power-up when VCC ramps from 0 V to 3.3 V?

During power-up, outputs remain in high-impedance state until VCC exceeds 1.2 V and nOE is asserted LOW. Internal circuitry ensures metastability-free initialization; bus hold becomes active once VCC > 1.5 V, preventing spurious transitions on floating inputs before system control asserts nLE/nOE.