Nexperia USA Inc. 74ALVCH16821DGGY

Overview

74ALVCH16821DGGY from Nexperia is a 20-bit bus-interface D-type flip-flop with dual 10-bit edge-triggered registers, positive-edge clocking, independent 3-state output enables (1OE/2OE), bus-hold inputs, and operation across 1.2 V to 3.6 V supply. It delivers 24 mA drive at 3.0 V and supports high-speed data latching in memory address/data buffering applications.

For engineers reviewing the 74ALVCH16821DGGY datasheet, 74ALVCH16821DGGY pinout, 74ALVCH16821DGGY application, or 74ALVCH16821DGGY equivalent, key selection criteria include its TSSOP56 package, dual-section clock/output-enable independence, bus-hold functionality eliminating external resistors, and guaranteed timing performance down to −40 °C.

Technical Context

This device implements two fully independent 10-bit register sections, each with dedicated rising-edge clock (1CP/2CP) and active-low output enable (1OE/2OE). 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.

It features integrated bus-hold circuitry on all 20 data inputs (1D0–1D9, 2D0–2D9), maintaining valid logic levels without external pull resistors. Output drive capability supports direct termination into 50 Ω transmission lines at 85 °C, and noise immunity is enhanced by low-inductance multiple V_CC/GND pins.

Key Specifications

Pinout & Package

TSSOP56 plastic thin shrink small outline package (SOT364-1), 56-pin, 0.5 mm pitch, 6.1 mm body width, 1.2 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVCH16821DGGR, the 74ALVCH16821DGGY offers identical performance with standard RoHS compliance; versus 74LVC16374ADGG, it adds critical bus-hold functionality and wider voltage support, eliminating design risk from floating inputs in modular systems.

Availability

74ALVCH16821DGGY is available at Aetrix Electronics and suitable for industrial PLCs, memory subsystems, automated test equipment, and high-reliability embedded controllers requiring stable component supply across extended temperature ranges.

Supply support for 74ALVCH16821DGGY 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 optimized for efficiency, reliability, and miniaturization in industrial, automotive, and consumer applications.

The 74ALVCH series targets high-speed, low-voltage bus interface applications requiring robust noise immunity, wide supply flexibility, and minimal external components - especially in space-constrained industrial control and communications hardware.

FAQ

Does 74ALVCH16821DGGY support 1.8 V operation?

Yes. The device is fully specified from 1.2 V to 3.6 V, including guaranteed timing and drive performance at 1.8 V. At V_CC = 1.8 V, t_pd is 5.8 ns max, t_su is 1.4 ns min, and output drive remains functional (though reduced vs. 3.3 V). Bus-hold operates across the full voltage range.

Can 1OE and 2OE be tied together for single-enable operation?

Yes. Connecting 1OE and 2OE simplifies control logic when both 10-bit sections must be enabled or disabled simultaneously. No electrical conflict arises - both inputs are CMOS-compatible with identical DC specs (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V at 3.3 V). Ensure driver can sink/source combined input leakage (≤1 μA total).

What is the maximum clock frequency supported with 50 pF load?

At V_CC = 3.0–3.6 V and C_L = 50 pF, the maximum clock frequency is 350 MHz (typical) with 150 MHz guaranteed minimum. This is validated per JEDEC test conditions (Fig. 7, Table 9) using 500 Ω source termination and 50 pF total load including probe/jig capacitance.

How does bus-hold behave during power-up or brown-out?

Bus-hold circuitry activates only when V_CC exceeds ~0.8 V and remains functional down to V_CC = 1.2 V. During power ramp-up, inputs are held at last-valid state once V_CC crosses threshold; during brown-out, hold persists until V_CC falls below 1.2 V, preventing metastability in downstream logic.