Nexperia USA Inc. 74ALVT16821DGGY

Overview

74ALVT16821DGGY from Nexperia is a 20-bit positive-edge-triggered D-type flip-flop with dual 10-bit sections, 3-state outputs, bus-hold inputs, and BiCMOS logic for high-speed bus interfacing. It operates from 2.3 V to 3.6 V, supports TTL-level inputs, and delivers ≤3.2 ns propagation delay at 3.3 V - used in high-density data path buffering and synchronous bus isolation in industrial control backplanes.

For engineers reviewing the 74ALVT16821DGGY datasheet, 74ALVT16821DGGY pinout, 74ALVT16821DGGY application, or 74ALVT16821DGGY equivalent, key selection criteria include dual-clock (1CP/2CP) independent control, 5.5 V overvoltage-tolerant inputs, power-up 3-state behavior, IOFF partial power-down, and verified -40 °C to +85 °C operation without external pull-ups.

Technical Context

This device implements two independent 10-bit D-register banks, each with dedicated clock (1CP/2CP) and output enable (1OE/2OE) pins, enabling asymmetric timing control across data lanes. Bus-hold circuitry on all 20 data inputs eliminates external termination resistors while maintaining valid logic states on floating lines.

Its BiCMOS architecture combines bipolar speed and CMOS low static power, delivering 150 MHz maximum clock frequency and sub-4 ns propagation delays. The IOFF circuit ensures high-impedance outputs during power-down, preventing back-driving on shared buses when VCC = 0 V.

Key Specifications

Pinout & Package

TSSOP56 plastic thin shrink small outline package (SOT364-1), 56-pin, 6.1 mm body width, 0.5 mm pitch - optimized for high I/O density PCB layouts with thermal and mechanical reliability in automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 20-bit bus interface register applications.

Compared with SN74ALVTH16821DGGR and 74LVT16821DGGY, the 74ALVT16821DGGY uniquely integrates bus-hold and IOFF in a single industrial-qualified package - reducing component count, eliminating layout-sensitive pull resistors, and enabling true zero-power bus isolation during module removal.

Availability

74ALVT16821DGGY is available at Aetrix Electronics and suitable for industrial backplane interfaces, high-density memory buffering, legacy voltage translation, and hot-swappable module control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74ALVT16821DGGY 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 discrete components - serving automotive, industrial, and consumer markets with scalable manufacturing and rigorous quality systems.

The 74ALVT16821 belongs to Nexperia's Advanced Low-Voltage Technology (ALVT) logic family, engineered specifically for high-speed, low-power 2.5 V/3.3 V bus interfacing in space-constrained industrial and communications equipment.

FAQ

Does the 74ALVT16821DGGY require external pull-up resistors on unused data inputs?

No. The device integrates bus-hold circuitry on all 20 data inputs (1D0–1D9, 2D0–2D9), actively maintaining valid logic states without external components. Measured bus-hold current is ±140 μA at 3 V, sufficient to override typical PCB leakage and noise.

What happens to outputs during power-up or brown-out conditions?

The 74ALVT16821DGGY features power-up 3-state behavior: outputs remain in high-impedance until VCC reaches valid operating range (~2.3 V). Additionally, IOFF circuitry forces outputs to high-Z when VCC = 0 V, preventing back-driving in partial-power scenarios.

Can 1CP and 2CP be driven from different clock domains simultaneously?

Yes. The two clock inputs operate independently - each controlling its associated 10-bit register bank. Setup/hold times (tsu = 1.5 ns, th = 0.5 ns at 3.3 V) apply per clock, enabling true dual-domain synchronization without cross-talk or metastability risk between banks.

Is the 74ALVT16821DGGY qualified for automotive applications?

No. This device is specified for industrial temperature range (-40 °C to +85 °C) and carries no AEC-Q100 qualification. Nexperia explicitly states non-automotive qualification in its legal disclaimers; use in automotive systems requires formal validation and carries full customer liability per datasheet terms.