Texas Instruments SN74LVC652DW

Overview

SN74LVC652DW 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 3.3-V/5-V I/O, delivers 7.4 ns max propagation delay at 3.3 V, and features independent clock (CLKAB/CLKBA), select (SAB/SBA), and output-enable (OEAB/OEBA) controls - enabling real-time or registered data transfer in industrial backplane interfaces.

For engineers reviewing the SN74LVC652DW datasheet, SN74LVC652DW pinout, SN74LVC652DW application, or SN74LVC652DW equivalent, key selection criteria include its dual-clock register architecture, Ioff partial-power-down support, 5.5-V-tolerant inputs, and SOIC-24 package compatibility with legacy board layouts requiring robust bus isolation and storage.

Technical Context

The SN74LVC652DW integrates eight D-type flip-flops per bus direction, allowing simultaneous or staggered latching of A- or B-bus data on rising clock edges. Its select-control logic eliminates multiplexer glitches during transitions between real-time and stored data modes - a critical feature for glitch-free bus arbitration in programmable logic interconnects.

Each port supports independent 3-state output control via OEAB and OEBA, while input tolerance up to 5.5 V enables direct interfacing with 5-V TTL logic without level shifters. The Ioff circuitry ensures high-impedance outputs during power-down, preventing backflow current when VCC = 0 V.

Key Specifications

Pinout & Package

SN74LVC652DW is housed in a 24-pin SOIC (DW) package with 0.300-inch body width, JEDEC MS-013 compliant footprint, and RoHS-compliant Cu/Ni/Pd/Au lead finish. Thermal resistance θJA = 46°C/W enables stable operation at full drive strength without forced airflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC652APW and SN74ALVC16652DL, the SN74LVC652DW offers superior thermal performance in SOIC packaging and unique 5.5-V input tolerance - making it the optimal choice for industrial backplanes interfacing heterogeneous voltage domains where reliability under partial power-down is critical.

Availability

SN74LVC652DW is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA-to-ASIC bridging, automated test equipment bus arbitration, and embedded controller memory expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVC652DW 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 leader delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74LVC652DW belongs to TI's LVC logic family, engineered for low-voltage, high-speed bidirectional bus management in mixed-signal systems where voltage translation, register storage, and robust 3-state control are essential.

FAQ

What is the maximum clock frequency supported by SN74LVC652DW?

The SN74LVC652DW supports a maximum clock frequency of 100 MHz at VCC = 3.3 V, as specified in the timing characteristics table. This applies to both CLKAB and CLKBA inputs under recommended operating conditions (TA = –40°C to +85°C, VCC = 3.3 V ±0.3 V). At lower VCC (e.g., 1.8 V), the maximum frequency is not characterized per the datasheet, and design margin must be applied accordingly for SN74LVC652DW implementations.

Does SN74LVC652DW support hot-swap capability?

Yes, SN74LVC652DW supports partial-power-down operation via its Ioff circuitry. When VCC = 0 V, the outputs enter high-impedance state and leakage current is limited to ±10 µA, preventing damaging backflow current from live buses into the unpowered device - a core requirement for hot-swap backplane designs using SN74LVC652DW.

Can SN74LVC652DW interface directly with 5-V logic devices?

Yes, SN74LVC652DW inputs tolerate voltages up to 5.5 V regardless of VCC level, enabling direct connection to 5-V TTL or CMOS outputs without external level shifters. However, its outputs swing only from GND to VCC (max 3.6 V), so driving 5-V inputs requires external pull-up or translation - a key constraint when designing bidirectional interfaces involving SN74LVC652DW.

What is the recommended power-up sequencing for SN74LVC652DW?

To ensure defined high-impedance states during power-up, OEBA should be tied to VCC via a pull-up resistor and OEAB to GND via a pull-down resistor. Minimum resistor values depend on driver strength but typically ≥10 kΩ suffices. This prevents bus contention before firmware initializes control signals - a critical practice for reliable startup in systems using SN74LVC652DW.

How does the select-control logic eliminate glitches in SN74LVC652DW?

SN74LVC652DW uses dedicated combinational logic that decouples SAB/SBA evaluation from clock edges, ensuring clean transitions between real-time and stored data modes without intermediate invalid states. Unlike basic multiplexers, this architecture avoids momentary bus float or contention during select changes - a verified behavior confirmed in Figure 1 and functional table of the SN74LVC652DW datasheet.