NXP Semiconductors 74LVT652DB,118

Overview

74LVT652DB,118 from NXP Semiconductors (formerly Philips) is a 3.3V octal transceiver/register with non-inverting 3-state outputs, independent A/B bus registers, multiplexed real-time/stored data paths, and bus-hold inputs. It supports bidirectional 8-bit data transfer between 3.3V and 5V systems in high-speed industrial control backplanes.

For engineers reviewing the 74LVT652DB,118 datasheet, 74LVT652DB,118 pinout, 74LVT652DB,118 application, or 74LVT652DB,118 equivalent, key selection criteria include its 2.6 ns typical propagation delay (An→Bn), ±64 mA/–32 mA output drive, 3.3V supply with 5V-tolerant I/O, power-up 3-state behavior, and SSOP-24 package compatibility.

Technical Context

The 74LVT652DB,118 implements dual 8-bit D-type flip-flop registers with separate clock (CPAB/CPBA), select (SAB/SBA), and output-enable (OEAB/OEBA) controls per direction. Its BiCMOS architecture enables simultaneous real-time pass-through and registered data storage, supporting four distinct bus-management modes: real-time A↔B transfer, A/B storage, and stored-data output to either bus.

It features TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V), 5V-tolerant I/O pins, bus-hold circuitry on all A-side inputs (±75 µA overdrive current), and latch-up protection exceeding 500 mA per JEDEC Std 17 - enabling robust operation in mixed-voltage backplane environments without external pull-ups or level shifters.

Key Specifications

Pinout & Package

74LVT652DB,118 is housed in a 24-pin plastic shrink small outline package (SSOP), body width 5.3 mm, drawing code SOT340-1, with standard JEDEC MO-153 footprint and 0.65 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC8T245RHLR and 74ALVT162245DL,118, the 74LVT652DB,118 uniquely combines octal width, dual independent registers, 5V-tolerant I/O, bus-hold, and multiplexed real-time/stored operation - making it irreplaceable for applications requiring deterministic data capture and flexible bus arbitration in compact 24-pin SSOP form factor.

Availability

74LVT652DB,118 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bridging, and modular instrumentation chassis requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for 74LVT652DB,118 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

NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering logic and interface IC development.

The 74LVT652DB,118 belongs to NXP's legacy LVT (Low-Voltage Technology) logic family, designed specifically for high-speed, mixed-voltage system interconnect in industrial automation and telecom infrastructure where reliability, 5V compatibility, and register-controlled data staging are essential.

FAQ

What is the maximum clock frequency supported by the 74LVT652DB,118?

The 74LVT652DB,118 supports a maximum clock frequency of 150 MHz at VCC = 3.3 V and Tamb = –40°C to +85°C, as specified in its AC characteristics table. This is enabled by its 2.0 ns typical propagation delay from clock input to output (CPAB→Bn) and tight 3.3 ns minimum pulse width requirement, allowing reliable operation in high-speed synchronous bus architectures without added timing margin overhead.

Does the 74LVT652DB,118 require external pull-up resistors on its A-side inputs?

No, the 74LVT652DB,118 does not require external pull-up resistors on its A0–A7 inputs because it integrates bus-hold circuitry with ±75 µA overdrive current. This feature actively maintains the last-valid logic state on unused or floating A-side pins, eliminating risk of undefined logic levels and reducing BOM count - a key advantage over standard LVT or LVCMOS transceivers.

Can the 74LVT652DB,118 safely interface with 5V logic systems?

Yes, the 74LVT652DB,118 safely interfaces with 5V logic systems: its I/O pins tolerate up to 5.5 V regardless of VCC, and its input thresholds (VIH = 2.0 V, VIL = 0.8 V) are fully compatible with TTL and 5V CMOS output levels. Additionally, its outputs present zero DC load when disabled and tied to a 5V bus, preventing unintended loading of legacy backplane rails.

What happens to the outputs of the 74LVT652DB,118 during power-up?

During power-up, the 74LVT652DB,118 outputs enter a high-impedance (3-state) condition before VCC reaches valid operating voltage - a feature explicitly documented as "power-up 3-state." This prevents bus contention and signal corruption on shared data lines during system initialization, ensuring clean startup in multi-device backplane environments without requiring external reset coordination.

How does the 74LVT652DB,118 handle simultaneous data capture from both A and B buses?

The 74LVT652DB,118 handles simultaneous data capture by allowing independent clocking: when both SAB and SBA are low, CPAB and CPBA can be asserted concurrently to load A→B and B→A data into their respective registers on the same clock edge. If either SAB or SBA is high, clocks must be staggered to avoid race conditions - a behavior confirmed in the Function Table note ** and validated in the Logic Diagram.