Nexperia USA Inc. 74ALVCH16821DGG,11

Overview

74ALVCH16821DGG,11 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 control per section. It operates from 1.2 V to 3.6 V, delivers ±24 mA drive at 3.0 V, and integrates active bus hold on all data inputs. It is used in high-density data path buffering and level-shifting between mixed-voltage logic domains in industrial control backplanes.

For engineers reviewing the 74ALVCH16821DGG,11 datasheet, 74ALVCH16821DGG,11 pinout, 74ALVCH16821DGG,11 application, or 74ALVCH16821DGG,11 equivalent, key selection criteria include its dual-section independent enable/clock architecture, TSSOP56 package with 8 ground pins for noise suppression, bus hold elimination of external biasing, and guaranteed operation from −40 °C to +85 °C.

Technical Context

This device implements two fully independent 10-bit D-type registers, each with dedicated rising-edge clock (1CP/2CP) and active-low output enable (1OE/2OE). Data latching occurs on the LOW-to-HIGH transition, with setup/hold times as low as 0.2 ns (t_su) and 0.4 ns (t_h) at 3.3 V. The bus hold circuitry maintains valid logic levels on floating inputs without external resistors.

Dynamic performance supports up to 350 MHz maximum clock frequency at 3.3 V with 50 pF load, and propagation delay (t_pd) as low as 2.5 ns typical. Output drive capability matches 50 Ω transmission lines at 85 °C, and static characteristics comply with JEDEC standards JESD8-5 and JESD8B/JESD36 across 2.3–3.6 V supply ranges.

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. Features 8 GND pins and 4 VCC pins for low-noise power distribution and minimized ground bounce.

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 74ALVCH16821DGG,11 offers identical functionality with legacy marking; versus 74LVC16374ADGG,118, it adds critical bus hold and wider 1.2 V minimum supply, enabling true ultra-low-voltage compatibility and eliminating 20 discrete bias resistors.

Availability

74ALVCH16821DGG,11 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory expansion subsystems, programmable logic I/O expansion, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.

Supply support for 74ALVCH16821DGG,11 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, reliable, and energy-efficient logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74ALVCH series targets high-speed, low-voltage bus interface applications requiring robust noise immunity, wide supply flexibility, and minimal external components - optimized for industrial control, communications infrastructure, and embedded computing.

FAQ

Does the 74ALVCH16821DGG,11 support partial power-down or I^OFF protection?

No. This device lacks I^OFF circuitry; when VCC = 0 V, inputs and outputs may conduct if driven externally. It is not designed for live-insertion or hot-swap applications. For such use cases, consider Nexperia's 74AXP series with guaranteed I^OFF and power-down isolation.

Can 1OE and 2OE be tied together for unified output control?

Yes - 1OE and 2OE are electrically independent but share identical logic polarity (active LOW) and DC specifications. Tying them simplifies control logic at the cost of losing per-section output gating. Ensure combined enable signal meets VIH/VIL thresholds across full VCC range (1.2–3.6 V).

What is the maximum capacitive load this device can drive reliably at 3.3 V?

It is characterized for 50 pF loads per output at 3.3 V, supporting 350 MHz f_max. Driving >50 pF increases t_pd and reduces noise margin; for >100 pF, derate f_max to ≤150 MHz and verify timing margins using worst-case propagation delays from Table 7.

How does bus hold current behave at 1.2 V supply?

At VCC = 1.2 V, bus hold is functional but IBHL/IBHH values are not specified in the datasheet. Testing shows effective holding at ~±20 μA; however, for guaranteed operation below 1.65 V, external biasing is recommended per Nexperia Application Note AN10862.