Nexperia USA Inc. 74ALVT16821DL,512

Overview

74ALVT16821DL,512 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. It operates from 2.3 V to 3.6 V, supports 5.5 V-tolerant inputs, and delivers ≤3.2 ns propagation delay at 3.3 V - used in high-speed parallel bus interfacing for industrial control backplanes and memory expansion modules.

For engineers reviewing the 74ALVT16821DL,512 datasheet, 74ALVT16821DL,512 pinout, 74ALVT16821DL,512 application, or 74ALVT16821DL,512 equivalent, key selection criteria include dual-clock (1CP/2CP) and dual-OE (1OE/2OE) independent control per 10-bit section, bus-hold input retention without external pull-ups, and guaranteed 150 MHz maximum clock frequency across -40 °C to +85 °C.

Technical Context

This device implements two independent 10-bit D-register sections sharing no internal signal paths: each has dedicated clock (1CP/2CP), output enable (1OE/2OE), ten data inputs (1D0–1D9 / 2D0–2D9), and ten 3-state outputs (1Q0–1Q9 / 2Q0–2Q9). Bus-hold circuitry actively maintains last-valid logic state on unused data inputs, eliminating external termination resistors.

Its BiCMOS architecture enables TTL-level compatibility, overvoltage-tolerant inputs up to 5.5 V, and low-power 3-state operation with IOFF circuitry for partial power-down. The device features power-up 3-state behavior and meets JESD78 Class II Level B latch-up immunity (>500 mA).

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 thermal and signal integrity advantages over SSOP.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH16821DGGR, the 74ALVT16821DL,512 provides essential bus-hold functionality that eliminates external components; versus 74LVC16374ADGG,118, its dual-clock/dual-OE architecture enables true independent 10-bit channel management - critical for time-multiplexed or asymmetric bus protocols.

Availability

74ALVT16821DL,512 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion modules, high-speed test equipment, and communications protocol bridges requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74ALVT16821DL,512 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 - delivering robust, scalable solutions for industrial, automotive, and consumer applications.

The 74ALVT series targets high-speed, low-voltage bus interface applications where BiCMOS performance, overvoltage tolerance, and bus-hold integration are essential - designed specifically for demanding parallel data path architectures.

FAQ

Does the 74ALVT16821DL,512 support hot-swap insertion?

Yes - its IOFF circuitry disables current flow when VCC = 0 V, preventing back-driving of live backplanes during insertion. Combined with power-up 3-state behavior and 5.5 V-tolerant inputs, it safely interfaces with powered systems before local supply stabilization.

Can both 10-bit sections operate at different clock frequencies?

Yes - 1CP and 2CP are electrically isolated inputs; each section updates only on its own rising clock edge. This allows asynchronous latching of two independent data streams, such as separate address and control words in a multi-cycle bus transaction.

What is the minimum setup time required at 2.5 V supply?

At VCC = 2.5 V ± 0.2 V, the guaranteed minimum setup time (tsu) is 2.0 ns for LOW-level data transitions and 1.5 ns for HIGH-level transitions relative to the rising clock edge - verified across −40 °C to +85 °C per datasheet Table 7.

How does bus-hold current affect power consumption in idle mode?

Bus-hold draws only 75–130 μA (LOW) or −75–−140 μA (HIGH) per input at VCC = 3 V - adding <1.5 mA total for all 20 inputs. This is negligible versus typical ICC of 0.1 mA (outputs disabled) and enables zero-resistor termination without measurable impact on standby power.