Texas Instruments SN74LVC652DBLE

Overview

SN74LVC652DBLE 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) in mixed-voltage systems. It operates from 1.65 V to 3.6 V, supports 5-V-tolerant inputs, delivers max tpd of 7.4 ns at 3.3 V, and features Ioff partial-power-down protection-used in industrial backplane interfaces requiring real-time or registered data transfer.

For engineers reviewing the SN74LVC652DBLE datasheet, SN74LVC652DBLE pinout, SN74LVC652DBLE application, or SN74LVC652DBLE equivalent, key selection criteria include dual-clock register synchronization (CLKAB/CLKBA), independent select (SAB/SBA) and output-enable (OEAB/OEBA) controls, 24-pin SSOP package compatibility, and 5-V input tolerance enabling 3.3-V/5-V level translation in legacy-to-modern system interconnects.

Technical Context

This device integrates eight D-type flip-flops per bus direction, enabling simultaneous storage of A- and B-bus data on low-to-high clock transitions. Its select-control logic eliminates multiplexer glitches during real-time ↔ stored data mode transitions-SAB = L selects real-time A→B transfer; SBA = L selects real-time B→A transfer.

The transceiver supports true bidirectional isolation: when OEAB and OEBA are both low, outputs drive actively; when either is high, corresponding bus outputs enter high-impedance state. Ioff circuitry ensures no backflow current during partial power-down, and input clamping allows safe interfacing with 5-V sources while powered from 1.65–3.6 V.

Key Specifications

Pinout & Package

SN74LVC652DBLE is housed in a 24-pin SSOP (Shrink Small-Outline Package), pin-compatible with industry-standard SOIC-24 footprints but with 0.65-mm lead pitch and reduced body width (7.5 mm × 5.6 mm). The package supports fine-pitch PCB assembly and offers improved thermal resistance (θJA ≈ 65°C/W) versus standard SOIC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC652DBLE, SN74LVC652ADWR provides identical functionality in a more widely supported SOIC package ideal for prototyping and legacy board reuse, while SN74LVC652APWR delivers superior board area efficiency and thermal performance in new compact designs-both eliminate obsolescence risk associated with the discontinued DBLE variant.

Availability

SN74LVC652DBLE is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus bridges, modular PLC I/O expansion, and automated test equipment signal routing requiring stable component supply and long-term design continuity.

Supply support for SN74LVC652DBLE 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 specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in high-reliability interface and power management ICs.

The SN74LVC652 family was engineered for robust bidirectional bus management in mixed-voltage industrial and computing systems-emphasizing glitch-free mode switching, Ioff safety, and wide VCC operability to simplify system-level voltage translation.

FAQ

What is the operating voltage range for SN74LVC652DBLE?

The SN74LVC652DBLE operates from 1.65 V to 3.6 V on VCC, with inputs tolerant up to 5.5 V. This allows direct interfacing with 5-V logic while powered from modern low-voltage rails. All DC and AC specifications-including propagation delay, drive strength, and noise margins-are guaranteed across this full range, making SN74LVC652DBLE suitable for heterogeneous voltage domain bridging in industrial and telecom systems.

Does SN74LVC652DBLE support partial power-down protection?

Yes, SN74LVC652DBLE includes Ioff circuitry that disables all outputs when VCC = 0 V, preventing damaging current backflow through the device during power sequencing or hot-swap events. This feature is explicitly tested and specified in the datasheet, with Ioff ≤ ±10 µA at VI or VO = 5.5 V and VCC = 0 V-critical for modular systems where boards may be inserted or removed while main power remains active.

How does the select-control logic prevent glitches in SN74LVC652DBLE?

SN74LVC652DBLE uses dedicated SAB and SBA inputs with internal synchronous decoding that eliminates typical multiplexer glitches during transitions between real-time and stored data modes. When SAB or SBA changes state, the output path is held stable until the next valid clock edge, ensuring no spurious pulses appear on A1–A8 or B1–B8. This behavior is verified in the function table and timing diagrams of the official TI datasheet SCAS303L.

Can SN74LVC652DBLE be used as a level translator between 1.8-V and 5-V systems?

SN74LVC652DBLE supports 5-V-tolerant inputs but is not a bidirectional level translator for 1.8-V outputs driving 5-V loads. Its outputs swing from GND to VCC (1.65–3.6 V), so when VCC = 1.8 V, VOH ≈ 1.6 V-insufficient to meet 5-V logic high thresholds. It functions reliably as a 5-V-to-3.3/1.8-V input translator, but external pull-up or buffer stages are required for true 1.8-V-to-5-V translation. SN74LVC652DBLE excels in unidirectional or bidirectional 3.3-V↔5-V interfacing.

Is there a pin-compatible replacement for the obsolete SN74LVC652DBLE?

Yes-SN74LVC652ADWR (SOIC-24) and SN74LVC652APWR (TSSOP-24) share identical logic, timing, and pinout with SN74LVC652DBLE, differing only in package dimensions and lead finish. Both are active, RoHS-compliant, and available in tape-and-reel formats. Board redesign is required due to mechanical differences (SSOP vs. SOIC/TSSOP), but schematic connectivity and firmware control remain unchanged-ensuring drop-in functional replacement with minimal layout adaptation.