Texas Instruments SN74LVC652APWR

Overview

SN74LVC652APWR from Texas Instruments is an octal bus transceiver and register with 3-state outputs, designed for bidirectional data flow control between two 8-bit buses (A and B). It operates from 1.65 V to 3.6 V, supports mixed-mode 5-V-tolerant inputs, and delivers 7.4 ns max propagation delay at 3.3 V - enabling use in high-speed 3.3-V system interconnects, FPGA-to-ASIC bridging, and memory-mapped peripheral interfaces.

For engineers reviewing the SN74LVC652APWR datasheet, SN74LVC652APWR pinout, SN74LVC652APWR application, or SN74LVC652APWR equivalent, key selection considerations include real-time vs. registered transfer modes, independent clocking (CLKAB/CLKBA), dual select controls (SAB/SBA), and Ioff-enabled partial-power-down capability for hot-swap and power-gated systems.

Technical Context

The SN74LVC652APWR integrates eight D-type flip-flops per bus direction, allowing synchronous storage of A- or B-bus data on low-to-high clock transitions. Its dual-select architecture eliminates multiplexer glitches during mode switching between real-time and stored data paths.

Control logic enables four distinct bus-management functions: real-time A→B or B→A transfer, independent storage of A or B data, simultaneous storage of both buses, and concurrent transfer of stored A→B and B→A data - all managed via OEAB/OEBA enable and SAB/SBA select inputs.

Key Specifications

Pinout & Package

TSSOP-24 package (PW), 7.8 mm × 4.4 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC652ADWR and SN74LVC652ANSR, the SN74LVC652APWR provides identical logic, timing, and voltage specifications in a space-optimized TSSOP-24 package - delivering 42% smaller footprint than SOIC and 30% narrower width than SOP while maintaining full pin compatibility and thermal performance up to 85°C.

Availability

SN74LVC652APWR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and automotive body electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LVC652APWR 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

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and logic devices for industrial, automotive, and communications markets.

The SN74LVC652APWR belongs to TI's LVC logic family - engineered for low-voltage, high-speed, mixed-signal interfacing with robust noise immunity, wide VCC range, and seamless 5-V tolerance in 3.3-V and lower systems.

FAQ

What is the maximum clock frequency supported by the SN74LVC652APWR?

The SN74LVC652APWR supports a maximum clock frequency of 100 MHz at VCC = 3.3 V, as specified in the timing characteristics table. At lower supply voltages (e.g., 1.8 V), the maximum frequency is not characterized in the datasheet, and design margins should be verified empirically. The device achieves this performance with a guaranteed 7.4 ns max propagation delay under recommended operating conditions.

Does the SN74LVC652APWR support 5-V input signals while operating at 1.65 V VCC?

Yes, the SN74LVC652APWR accepts input voltages up to 5.5 V regardless of VCC level - including at the minimum 1.65 V supply. This 5-V-tolerant input capability is explicitly guaranteed in the Recommended Operating Conditions table and enables direct interfacing with legacy 5-V logic without external level shifters, even when the device itself runs at 1.8 V or 2.5 V.

How does the Ioff feature of the SN74LVC652APWR protect the system during partial power-down?

The Ioff feature in the SN74LVC652APWR disables all outputs when VCC = 0 V, preventing damaging current backflow from live buses (e.g., 5-V A or B bus) into the unpowered device. This behavior is tested and guaranteed per JESD78, ensuring safe operation during hot-swap events or multi-rail power sequencing - a critical requirement for industrial and automotive systems where subsystems power up/down independently.

Can the SN74LVC652APWR simultaneously transfer stored data from Bus A to Bus B and from Bus B to Bus A?

Yes, the SN74LVC652APWR supports concurrent stored-data transfer in both directions when OEAB and OEBA are both low, SAB and SBA are both high, and appropriate clock edges are applied. This mode is explicitly documented in the Function Table as "Stored A data to B bus and stored B data to A bus", enabling full-duplex registered data exchange without external control logic.

What is the recommended power-up sequence for OEAB and OEBA on the SN74LVC652APWR to ensure high-impedance state at startup?

To guarantee high-impedance outputs during power-up, OEBA should be tied to VCC through a pullup resistor and OEAB to GND through a pulldown resistor. The minimum resistor value depends on the driver's current-sinking/sourcing capability - typically 10 kΩ suffices for most microcontroller GPIOs. This configuration prevents bus contention before firmware initializes control signals, as stated in the datasheet's application guidance section.