NXP Semiconductors 74LVT16652ADL,512

Overview

74LVT16652ADL,512 from Nexperia is a 3.3 V 16-bit bus transceiver/register with dual 8-bit or single 16-bit bidirectional data flow, real-time/store-select operation, and 3-state outputs. It features ±32 mA output drive, bus-hold inputs eliminating external pull-ups, and operates from −40 °C to +85 °C in SSOP56 package. Used in high-speed backplane and memory interface applications requiring glitch-free mode switching.

For engineers reviewing the 74LVT16652ADL,512 datasheet, 74LVT16652ADL,512 pinout, 74LVT16652ADL,512 application, or 74LVT16652ADL,512 equivalent, key selection criteria include propagation delay (2.1 ns typ), 56-pin SSOP package compatibility, 3.3 V supply with 5 V-tolerant I/O, bus-hold functionality, and dual-clock register control for A↔B data routing.

Technical Context

The 74LVT16652ADL,512 implements two independent 8-bit transceiver/register blocks, each with separate A-to-B and B-to-A clock (CPAB/CPBA), select (SAB/SBA), and output enable (OEAB/OEBA) controls. Its BiCMOS architecture enables TTL-level input thresholds and 3.3 V CMOS-compatible outputs while supporting 5 V bus interfacing without level shifters.

Real-time transfer occurs when SAB/SBA = LOW; stored-data transfer when HIGH. Clock-triggered latching (LOW-to-HIGH edge) operates independently of OE/S states, enabling transparent storage even during 3-state conditions. Bus-hold circuitry maintains last valid logic state on unused I/O pins at ±135 µA overdrive current.

Key Specifications

Pinout & Package

74LVT16652ADL,512 uses SSOP56 (SOT371-1) package: plastic shrink small outline, 56 leads, 7.5 mm body width, 0.635 mm pitch. Pin 1 index located at top-left corner; thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver/register applications.

Compared with 74ALVCH16652DL,118 and SN74LVC16652DGGR, the 74LVT16652ADL,512 uniquely combines 5 V-tolerant I/O, integrated bus-hold, and ±32 mA drive in an industrial-temperature SSOP56 package-making it optimal for mixed-voltage, hot-pluggable, and noise-prone applications where signal integrity and layout simplicity are prioritized.

Availability

74LVT16652ADL,512 is available at Aetrix Electronics and suitable for backplane routing, memory interface buffering, and industrial I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVT16652ADL,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 leader spun off from NXP's Standard Products division in 2017, specializing in high-performance logic, discrete, and power MOSFET solutions for automotive, industrial, and computing markets.

The 74LVT16652ADL,512 belongs to Nexperia's LVT (Low-Voltage TTL) logic family, engineered for 3.3 V systems demanding 5 V-tolerant interfacing, high-speed data routing, and robust operation in electrically noisy environments.

FAQ

What is the maximum clock frequency supported by the 74LVT16652ADL,512 in register mode?

The 74LVT16652ADL,512 supports up to 180 MHz typical maximum clock frequency at VCC = 3.3 V ± 0.3 V, as specified in Table 8 of its datasheet. This performance enables use in high-speed synchronous bus applications such as memory controllers and FPGA interconnects where precise edge-aligned data capture is required. The 74LVT16652ADL,512 achieves this with sub-3 ns propagation delays and tight setup/hold timing margins.

Does the 74LVT16652ADL,512 require external pull-up resistors on unused I/O pins?

No, the 74LVT16652ADL,512 integrates bus-hold circuitry on all A- and B-side I/O pins, providing ±135 µA overdrive current to maintain the last valid logic state without external components. This feature eliminates the need for pull-up or pull-down resistors in unconnected or intermittently driven bus configurations, reducing BOM cost and PCB space. The 74LVT16652ADL,512's bus-hold is active across the full operating temperature range.

Can the 74LVT16652ADL,512 interface directly with 5 V logic systems?

Yes, the 74LVT16652ADL,512 features 5 V-tolerant inputs and outputs, allowing direct connection to 5 V buses without level shifters or clamping diodes. Its I/O pins accept input voltages up to 5.5 V and safely drive 5 V lines with no additional current limiting, provided VCC remains at 3.3 V. This capability is explicitly confirmed in Table 6 (Recommended Operating Conditions) and Table 5 (Limiting Values) of the 74LVT16652ADL,512 datasheet.

How does the 74LVT16652ADL,512 handle power-up sequencing to prevent bus contention?

The 74LVT16652ADL,512 incorporates power-up 3-state logic that holds all outputs in high-impedance until VCC exceeds 1.2 V, preventing spurious signals or contention during power ramp-up. Additionally, its power-up reset function ensures predictable initial register states. This behavior is verified in Table 7 (Static Characteristics), where IPU/IPD parameters define controlled 3-state current during VCC transitions. The 74LVT16652ADL,512 thus eliminates need for external reset sequencing in most 3.3 V systems.

What is the purpose of the complementary OEAB and OEBA inputs on the 74LVT16652ADL,512?

The 74LVT16652ADL,512 uses separate active-LOW OEAB (A→B enable) and OEBA (B→A enable) inputs to provide independent directional control of each transceiver path. When both are LOW, the device operates in bidirectional real-time mode; when only one is LOW, data flows unidirectionally. Simultaneous activation also enables bus reinforcement-where outputs actively drive their corresponding inputs to hold bus state-without requiring external feedback paths. This dual-OE architecture is fundamental to the 74LVT16652ADL,512's flexible bus management capability.