Nexperia USA Inc. 74ALVT162821DGGY

Overview

74ALVT162821DGGY from Nexperia is a 20-bit positive-edge-triggered D-type flip-flop with integrated 30 Ω series output termination resistors, dual independent clock (1CP/2CP) and output enable (1OE/2OE) controls, bus-hold inputs, and operation across 2.3 V to 3.6 V supply. It functions as either one 20-bit or two 10-bit registers in high-speed bus interface applications such as backplane data latching in telecom line cards.

For engineers reviewing the 74ALVT162821DGGY datasheet, 74ALVT162821DGGY pinout, 74ALVT162821DGGY application, or 74ALVT162821DGGY equivalent, key selection criteria include its 30 Ω on-die termination eliminating external resistors, ±12 mA drive strength, -40 °C to +85 °C industrial temperature range, TSSOP56 package with 56 pins, and dual 10-bit partitioning for independent bus control.

Technical Context

This device implements two independent 10-bit D-register banks, each with dedicated clock (nCP) and output enable (nOE) inputs, enabling asynchronous control of separate data paths. Each register stage samples D-inputs on the LOW-to-HIGH transition of its respective clock and holds state until the next valid edge.

Bus-hold circuitry actively maintains unused input logic states without external pull-ups, while IOFF protection ensures low leakage during partial power-down. The 30 Ω series resistor per output reduces signal reflections on terminated 5 V buses and enables direct TTL-level interfacing without external components.

Key Specifications

Pinout & Package

TSSOP56 plastic thin shrink small outline package (SOT364-1), 56-pin, body width 6.1 mm, 0.5 mm pitch, 1.2 mm max height - optimized for high-density PCB layouts with controlled impedance routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH162821DGGR and 74LVC16374APAG, the 74ALVT162821DGGY uniquely integrates 30 Ω termination and bus-hold in a 20-bit configuration, reducing component count and improving signal integrity on 5 V buses without sacrificing industrial temperature range or drive capability.

Availability

74ALVT162821DGGY is available at Aetrix Electronics and suitable for telecom backplane latching, industrial PLC I/O expansion, and automated test fixture control requiring stable component supply and long-term industrial lifecycle support.

Supply support for 74ALVT162821DGGY 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 delivering high-performance logic, analog, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for industrial and consumer markets.

The 74ALVT family targets high-speed, low-voltage bus interface applications requiring robust signal integrity, mixed-voltage interoperability, and reduced external component count in space-constrained systems.

FAQ

What is the purpose of the 30 Ω series resistors on each output?

Each output includes an integrated 30 Ω series resistor to match typical PCB trace impedances and suppress signal reflections on 5 V buses. This eliminates the need for 20 discrete external termination resistors, reducing BOM cost, PCB area, and potential layout errors while maintaining signal integrity at high data rates.

How does bus-hold functionality affect unused input pins?

Bus-hold circuitry actively maintains the last valid logic state on any unconnected or unterminated data input (1D0–1D9, 2D0–2D9), preventing floating conditions that could cause excessive current draw or metastability. No external pull-up or pull-down resistors are required, simplifying design and improving reliability in modular or field-upgradeable systems.

Can 74ALVT162821DGGY interface directly with 5 V TTL logic?

Yes - the device features overvoltage-tolerant inputs rated to 5.5 V and outputs compatible with TTL logic levels. When powered from 3.3 V VCC, VOH reaches 2.3 V minimum (at -32 mA), exceeding TTL VIH threshold, and VOL stays below 0.5 V, satisfying TTL VIL requirements. This enables seamless bridging between 3.3 V controllers and legacy 5 V peripherals.

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

During power-up, outputs remain in high-impedance 3-state until VCC reaches a valid operating level, preventing bus contention. Under brown-out, IOFF circuitry activates when VCC drops near 0 V, blocking current flow through outputs even if driven by external 5 V signals - enabling safe live insertion/extraction and protecting downstream circuitry.