NXP Semiconductors 74ALVT162821DGG112

Overview

74ALVT162821DGG112 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, and bus-hold inputs - designed for high-speed 3.3 V or 2.5 V bus interface applications in telecom backplanes and industrial control systems.

For engineers reviewing the 74ALVT162821DGG112 datasheet, 74ALVT162821DGG112 pinout, 74ALVT162821DGG112 application, or 74ALVT162821DGG112 equivalent, key selection criteria include its 150 MHz maximum clock frequency, ±12 mA output drive, 3-state bus isolation, overvoltage-tolerant 5.5 V inputs, and TSSOP56 package with 56-pin 0.5 mm pitch for dense PCB layouts.

Technical Context

This BiCMOS device implements two independent 10-bit registers, each with dedicated clock and output-enable inputs, enabling flexible partitioning of data paths without inter-register timing coupling. Its internal bus-hold circuitry actively maintains logic states on unused data inputs, eliminating external pull-up resistors.

The 30 Ω series termination at each output minimizes signal reflections on controlled-impedance PCB traces, while IOFF circuitry ensures low leakage during partial power-down. Input clamping to −0.85 V and tolerance up to +5.5 V allow safe interfacing with mixed-voltage systems.

Key Specifications

Pinout & Package

Package: TSSOP56 (SOT364-1), plastic thin shrink small outline, 56 leads, 6.1 mm body width, 0.5 mm lead pitch, 1.2 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH162821GR and 74LVC16374APAG, the 74ALVT162821DGG112 delivers lower system-level BOM count and improved signal integrity via on-die 30 Ω termination and bus-hold, reducing design risk in high-speed or noisy industrial environments.

Availability

74ALVT162821DGG112 is available at Aetrix Electronics and suitable for telecom backplane interface, industrial PLC I/O modules, and automated test fixture control requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 74ALVT162821DGG112 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.

The 74ALVT162821DGG112 belongs to Nexperia's advanced ALVT logic family, engineered specifically for high-speed, low-noise bus interface applications in industrial automation and communications infrastructure.

FAQ

What is the primary function of the 74ALVT162821DGG112?

The 74ALVT162821DGG112 is a 20-bit positive-edge triggered D-type flip-flop with dual 10-bit sections, each controlled by independent clock (1CP/2CP) and output enable (1OE/2OE) inputs. It latches parallel data on rising clock edges and provides 3-state outputs with integrated 30 Ω series termination - making it ideal for high-speed bus interface applications where signal integrity and board space are critical. The 74ALVT162821DGG112 also features bus-hold inputs to prevent floating states on unused pins.

Does the 74ALVT162821DGG112 require external termination resistors?

No, the 74ALVT162821DGG112 does not require external termination resistors. Each of its 20 outputs integrates a 30 Ω series resistor, optimized for controlled-impedance PCB traces (e.g., 50 Ω or 60 Ω). This on-die termination eliminates the need for discrete resistors, reduces BOM count, saves board area, and improves signal fidelity by minimizing stub reflections - a key advantage over standard LVC or ALVCH devices like the 74LVC16374APAG.

Can the 74ALVT162821DGG112 interface with 5 V logic systems?

Yes, the 74ALVT162821DGG112 supports 5 V tolerant inputs - its inputs withstand voltages up to +5.5 V regardless of VCC (2.3 V to 3.6 V), enabling direct connection to legacy 5 V TTL or CMOS logic without level shifters. However, outputs swing rail-to-rail within the VCC range (e.g., 0 V to 3.3 V), so driving 5 V loads requires external buffering or open-drain configurations. The 74ALVT162821DGG112's overvoltage tolerance simplifies mixed-voltage system integration in industrial and test equipment.

How does the bus-hold feature work on the 74ALVT162821DGG112?

The 74ALVT162821DGG112 includes bus-hold circuitry on all 20 data inputs (1D0–1D9, 2D0–2D9), which actively maintains the last valid logic state when an input is left unconnected or unterminated. This eliminates the need for external pull-up or pull-down resistors, preventing undefined states and EMI-induced glitches. Bus-hold current is specified as ±130 μA (typical at 3 V), ensuring robust retention even under noise or marginal drive conditions - a critical reliability feature in industrial PLC I/O modules where connector wear or intermittent wiring may occur.

What is the significance of the IOFF feature in the 74ALVT162821DGG112?

The IOFF (power-off isolation) feature in the 74ALVT162821DGG112 disables current flow between powered and unpowered sections of a system, enabling safe live insertion and extraction in modular backplanes or hot-swappable I/O cards. When VCC = 0 V, IOFF limits leakage to ±100 μA even if inputs or outputs are biased to 4.5 V - preventing back-powering and latch-up. This makes the 74ALVT162821DGG112 suitable for telecom chassis and automated test fixtures where field-replaceable units must be serviced without full system shutdown.