Nexperia USA Inc. 74ALVCH16821DL,512

Overview

74ALVCH16821DL,512 from Nexperia is a 20-bit bus-interface D-type flip-flop with dual 10-bit edge-triggered registers, positive-edge clocking, and independent 3-state output enable control per register. It operates from 1.2 V to 3.6 V, delivers ±24 mA output drive at 3.0 V, and features integrated bus hold on all data inputs. It is used in high-density data path buffering and level translation between mixed-voltage logic domains in industrial control backplanes.

For engineers reviewing the 74ALVCH16821DL,512 datasheet, 74ALVCH16821DL,512 pinout, 74ALVCH16821DL,512 application, or 74ALVCH16821DL,512 equivalent, key selection criteria include its dual-register timing independence, bus hold elimination of external biasing, TSSOP56 package thermal performance, and JEDEC-compliant 2.3–2.7 V / 3.0–3.6 V operating ranges.

Technical Context

The device implements two fully independent 10-bit D-type flip-flop sections (Section 1: pins 1D0–1D9/1Q0–1Q9/1CP/1OE; Section 2: pins 2D0–2D9/2Q0–2Q9/2CP/2OE), each with separate rising-edge clock and active-low output enable. Data is latched on the LOW-to-HIGH transition of nCP, with setup/hold times as low as 0.2 ns (t_su) and 0.4 ns (t_h) at 3.3 V.

Bus hold circuitry maintains valid logic levels on unused inputs without external resistors, supporting robust operation in unterminated stubs or hot-swap scenarios. Output drive capability supports direct termination into 50 Ω transmission lines at 85 °C, and multiple VCC/GND pins minimize ground bounce in high-speed parallel buses.

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 thermal dissipation and signal integrity in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH16835DGGR and 74LVC16373ADGG, the 74ALVCH16821DL,512 uniquely combines 20-bit dual-section registration, bus hold, and MULTIBYTE™ pinout-enabling compact, robust, multi-voltage bus interfacing without design compromises.

Availability

74ALVCH16821DL,512 is available at Aetrix Electronics and suitable for industrial backplane buffering, FPGA I/O expansion, high-density memory interface latching, and test equipment digital pattern generation requiring stable component supply across extended temperature ranges.

Supply support for 74ALVCH16821DL,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 delivering high-performance logic, analog, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for industrial and consumer electronics.

The 74ALVCH series targets low-voltage, high-speed bus interface applications requiring mixed-voltage interoperability, minimal power consumption, and robust signal integrity in space-constrained systems.

FAQ

Does the 74ALVCH16821DL,512 support hot-swap insertion without external protection?

Yes - its integrated bus hold circuitry maintains valid logic states on all data inputs during insertion, preventing floating inputs from causing spurious transitions. The device also features HBM >2000 V ESD protection, making it suitable for controlled hot-swap environments when paired with appropriate power sequencing.

Can both register sections operate at different clock frequencies simultaneously?

Yes - Section 1 (1CP/1OE) and Section 2 (2CP/2OE) are electrically isolated. Each section has independent clock and output enable inputs, allowing asynchronous operation at distinct frequencies, phase relationships, or enable schedules without crosstalk or timing dependency.

What is the impact of bus hold on power consumption during static operation?

Bus hold draws ±75 μA typical per input at 3.0 V (up to ±150 μA max), adding <1.5 mA total for all 20 inputs. This is offset by eliminating 20 external pull resistors (typically 10 kΩ each), which would draw ~6.6 mA total at 3.3 V - resulting in net power reduction and improved system efficiency.

How does the MULTIBYTE™ pinout improve signal integrity compared to standard TSSOP layouts?

MULTIBYTE™ arranges inputs and outputs in linear flow-through order (e.g., 1D0→1Q0, 1D1→1Q1), enabling straight, length-matched PCB traces with minimal layer changes. This reduces skew, crosstalk, and impedance discontinuities - critical for maintaining timing margins in 20-bit parallel buses running above 100 MHz.