Nexperia USA Inc. 74ALVT162821DL,518

Overview

74ALVT162821DL,518 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 3-state outputs. It operates across 2.3 V to 3.6 V supply, delivers ±12 mA drive, supports 150 MHz max clock frequency, and is used in high-speed parallel bus interface applications such as memory data latching and backplane signal conditioning.

For engineers reviewing the 74ALVT162821DL,518 datasheet, 74ALVT162821DL,518 pinout, 74ALVT162821DL,518 application, or 74ALVT162821DL,518 equivalent, this page provides verified functional identity, TSSOP56 package mapping, 56-pin terminal roles, bus-hold behavior, propagation delay specs (tPLH/tPHL ≤ 5.0 ns @ 3.3 V), and direct alternatives for 20-bit registered bus interface design.

Technical Context

The device implements two independent 10-bit D-flip-flop banks-each with dedicated clock (1CP/2CP) and output enable (1OE/2OE)-enabling flexible partitioning of 20-bit data paths. Its BiCMOS architecture enables TTL-level compatibility while maintaining low-noise switching via multiple VCC/GND pins and internal 30 Ω series termination per output.

Bus-hold circuitry actively maintains logic states on unused data inputs without external pull-ups, and IOFF protection ensures partial power-down isolation when VCC = 0 V. The device supports live insertion/extraction and features power-up 3-state behavior to prevent bus contention during system initialization.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH162821GR, the 74ALVT162821DL,518 offers tighter VOL and superior bus-hold strength; versus 74LVT162821DGG, it eliminates eight external resistors and adds robust floating-input handling - reducing BOM, layout complexity, and risk of signal integrity issues.

Availability

74ALVT162821DL,518 is available at Aetrix Electronics and suitable for memory interface latching, backplane data conditioning, legacy bus bridging, and test equipment signal capture requiring stable component supply, industrial temperature support, and long-term lifecycle continuity.

Supply support for 74ALVT162821DL,518 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 74ALVT162821 belongs to Nexperia's Advanced Low-Voltage Technology (ALVT) logic family, engineered specifically for high-speed, low-power 20-bit parallel bus interfaces in space-constrained industrial and communications systems.

FAQ

What is the purpose of the 30 Ω series termination resistors in the 74ALVT162821DL,518?

The integrated 30 Ω series resistors are placed within each output driver path to match typical PCB trace impedances (e.g., 50–75 Ω) and suppress signal reflections. This eliminates the need for external termination resistors, reduces component count, saves board space, and improves signal integrity on high-speed parallel buses without requiring layout-level impedance tuning.

How does bus-hold functionality work, and what design benefit does it provide?

Bus-hold circuitry uses weak feedback transistors to maintain the last-valid logic state on any un-driven data input pin. With IBHL ≥ 75 μA and IBHH ≤ −75 μA at 3.0 V, it actively holds floating inputs at defined HIGH or LOW levels - preventing undefined states, reducing susceptibility to noise, and eliminating external pull-up/pull-down resistors in partially populated systems.

Can the 74ALVT162821DL,518 operate reliably when interfacing with 5 V logic systems?

Yes - its inputs are overvoltage tolerant up to 5.5 V, allowing direct connection to 5 V buses while powered from 2.3–3.6 V supplies. However, outputs swing only to VCC levels (max 3.6 V), so bidirectional 5 V interfacing requires external level-shifting for output signals returning to 5 V receivers.

What is the significance of the dual-clock and dual-output-enable architecture?

The separate 1CP/2CP and 1OE/2OE controls allow independent timing and gating of two 10-bit data groups. This enables use cases like byte-lane latching in memory subsystems, staggered data capture across differential pairs, or selective enabling of subsets of outputs - improving timing flexibility and reducing control logic overhead compared to monolithic 20-bit devices.