Nexperia USA Inc. 74ALVCH16843DGGY

Overview

74ALVCH16843DGGY from Nexperia is an 18-bit dual-section bus-interface D-type latch with independent 3-state control, bus hold inputs, and operation across 1.2 V to 3.6 V supply. It features two 9-bit latches (1D0–1D8/2D0–2D8), non-inverting 3-state outputs (1Q0–1Q8/2Q0–2Q8), and separate active-Low nOE/nPRE/nCLR and active-High nLE per section. Used in high-density data bus buffering and level translation between mixed-voltage logic subsystems.

For engineers reviewing the 74ALVCH16843DGGY datasheet, 74ALVCH16843DGGY pinout, 74ALVCH16843DGGY application, or 74ALVCH16843DGGY equivalent, key selection criteria include bus hold functionality eliminating external resistors, ±24 mA drive at 3.0 V, propagation delay ≤3.5 ns at 3.3 V, TSSOP56 package thermal and routing advantages, and JEDEC-compliant voltage interoperability with TTL and low-voltage CMOS.

Technical Context

This device implements two independent 9-bit transparent D-type latches with asynchronous preset and clear, each controlled by dedicated latch enable (nLE), output enable (nOE), preset (nPRE), and clear (nCLR) signals. The bus hold circuitry actively maintains valid logic levels on all 18 data inputs without external biasing.

Dynamic operation supports fast bus turnaround: enable time (ten) as low as 2.5 ns and disable time (tdis) as low as 2.6 ns at VCC = 3.3 V with 50 pF load. Propagation delay (tpd) from input to output is 2.1 ns typical, and setup/hold times are 0.0 ns and 0.5 ns respectively under same conditions - enabling reliable timing in high-speed synchronous bus architectures.

Key Specifications

Pinout & Package

TSSOP56 (SOT364-1) package: plastic thin shrink small outline, 56 leads, 6.1 mm body width, 0.5 mm pitch, 1.2 mm max height - optimized for high I/O density and thermal performance in space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH16835DGGR and 74LVC16373APAG, the 74ALVCH16843DGGY uniquely delivers full 18-bit width, dual-section independent control, bus hold, and widest voltage range - making it the only option supporting mixed-voltage backplane designs requiring glitch-free initialization and floating-input immunity.

Availability

74ALVCH16843DGGY is available at Aetrix Electronics and suitable for industrial PLC backplanes, automated test equipment channel routing, medical imaging data acquisition interfaces, and communications baseband processing modules requiring stable component supply across extended temperature and mixed-voltage operating conditions.

Supply support for 74ALVCH16843DGGY 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 industrial, automotive, and computing markets.

The 74ALVCH16843 belongs to Nexperia's advanced low-voltage CMOS logic family, engineered specifically for high-speed, low-power bus interfacing in mixed-supply systems where signal integrity, voltage translation, and layout efficiency are critical.

FAQ

Does the 74ALVCH16843DGGY support 1.8 V operation?

Yes, the device operates from 1.2 V to 3.6 V, fully specified down to 1.2 V. At 1.8 V, static parameters including VIH/VIL thresholds and output drive remain guaranteed per datasheet Table 6, and propagation delay increases to 4.3 ns max (VCC = 1.8 V implied from 2.3 V min condition). Bus hold remains functional across the entire range.

Can both latch sections be controlled simultaneously using shared signals?

No - nLE, nOE, nPRE, and nCLR are physically separate pins per section (1xx and 2xx). While external logic can tie them together, the device does not provide internal signal fanout or synchronization; independent control is the default and intended architecture per functional diagram and pin description.

What is the maximum capacitive load the outputs can drive reliably?

The outputs are characterized up to 50 pF load capacitance (Table 5, 7, 9), with propagation delay and timing margins fully specified at that value. Driving >50 pF is possible but degrades tpd and increases rise/fall times; for >75 pF, external series termination or buffer stages are recommended to maintain timing compliance.

Is the TSSOP56 package RoHS and REACH compliant?

Yes - Nexperia confirms SOT364-1 (TSSOP56) packaging for 74ALVCH16843DGGY meets RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006, with lead-free terminations and halogen-free molding compound, as documented in Nexperia's official compliance statements.