Texas Instruments SN74LVTH652DW

Overview

SN74LVTH652DW from Texas Instruments is a 3.3-V octal bus transceiver with dual D-type registers, supporting mixed-mode 5-V/3.3-V interfacing, real-time or stored data transfer, and hot-insertion via Ioff and power-up 3-state. It features bus-hold on all A/B data inputs, operates down to 2.7 V, and delivers 64 mA sink current per output at VCC = 3.3 V. Used in backplane interface logic and voltage-level-translating bus systems.

For engineers reviewing the SN74LVTH652DW datasheet, SN74LVTH652DW pinout, SN74LVTH652DW application, or SN74LVTH652DW equivalent, this page provides verified electrical specs, SOIC-24 package details, timing parameters (150 MHz max clock), bus-hold behavior, and validated alternatives for 3.3-V ↔ 5-V bidirectional bus management.

Technical Context

The SN74LVTH652DW integrates two independent 8-bit transceivers with register storage, each controlled by dedicated clock (CLKAB/CLKBA), select (SAB/SBA), and output-enable (OEAB/OEBA) inputs. Its dual-register architecture enables simultaneous or staggered capture of A- and B-bus data without decoding glitches during mode transitions.

It implements active bus-hold circuitry on all 16 data terminals (A1–A8, B1–B8), eliminating external pull resistors, and uses Ioff to block reverse current during partial power-down. The device supports TTL-compatible 5-V inputs while operating at 3.3-V VCC, with output ground bounce <0.8 V at 25°C.

Key Specifications

Pinout & Package

SN74LVTH652DW is housed in a 24-pin SOIC (DW) package, 7.5 mm × 15.4 mm body, 1.27 mm pitch, with standard JEDEC MO-002AC outline and RoHS-compliant NiPdAu lead finish. Thermal resistance θJA = 46°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVTH652DW, SN74LVT652DW trades bus-hold convenience for reduced quiescent current, while SN74LVTH16652DL offers doubled bandwidth at the cost of larger footprint and no SOIC packaging - making SN74LVTH652DW optimal for space-constrained 8-bit mixed-voltage interconnects.

Availability

SN74LVTH652DW is available at Aetrix Electronics and suitable for industrial PLC I/O modules, telecom line cards, and test equipment backplanes requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74LVTH652DW 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 decades of expertise in high-reliability interface ICs.

The SN74LVTH652DW belongs to TI's LVTH logic family, engineered for robust mixed-voltage bus bridging in industrial, telecom, and instrumentation systems where hot-swap capability and input stability are critical.

FAQ

What is the maximum clock frequency supported by the SN74LVTH652DW?

The SN74LVTH652DW supports a maximum clock frequency of 150 MHz across its recommended operating range (VCC = 2.7 V to 3.6 V). This value is specified in the timing requirements table of the official datasheet (SCBS706F, Rev. October 2003) and confirmed under CL = 50 pF load conditions. At VCC = 2.7 V, the minimum pulse width is 3.3 ns, directly supporting this 150 MHz limit. The SN74LVTH652DW achieves this performance while maintaining sub-5 ns propagation delays in both directions.

Does the SN74LVTH652DW require external pull-up or pull-down resistors on its data inputs?

No, the SN74LVTH652DW does not require external pull-up or pull-down resistors on its A1–A8 or B1–B8 data inputs because it integrates active bus-hold circuitry. Per the datasheet, this feature maintains unused or floating inputs at a valid logic level, with ±500 µA dynamic hold current at VCC = 3.6 V. Using external resistors with the SN74LVTH652DW is explicitly discouraged in the functional description, as it may interfere with bus-hold operation and increase power consumption unnecessarily.

Can the SN74LVTH652DW operate with a 5-V input signal while powered at 3.3 V?

Yes, the SN74LVTH652DW is specifically designed to accept 5-V TTL input signals while operating from a 3.3-V VCC supply. Its absolute maximum input voltage rating is 7 V, and the recommended operating condition specifies VI = 5.5 V. The device's input structure tolerates 5-V logic levels without damage or functional degradation, enabling direct interfacing with legacy 5-V systems - a core feature highlighted in the "Support Mixed-Mode Signal Operation" section of the datasheet.

What package type is used for the SN74LVTH652DW, and what are its key mechanical dimensions?

The SN74LVTH652DW uses a 24-pin SOIC (DW) package per JEDEC MO-002AC. Its body dimensions are 7.50 mm × 15.40 mm, with 1.27 mm lead pitch and 2.35 mm nominal height. The package has a thermal resistance θJA of 46°C/W and is RoHS-compliant with NiPdAu lead finish. Pin 1 is located in the top-left corner adjacent to the index notch, and the device is supplied in tubes of 25 units per package, as documented in TI's Packaging Information addendum.

How does the SN74LVTH652DW support hot-insertion in live backplane systems?

The SN74LVTH652DW supports hot-insertion through two complementary mechanisms: Ioff circuitry disables outputs when VCC = 0 V, blocking reverse current flow from live buses into the unpowered device; and power-up 3-state ensures outputs remain high-impedance during power ramp-up (0–1.5 V), preventing bus contention. Both features are tested per JESD 17 latch-up and JESD 22 ESD standards, and are explicitly cited in the datasheet's "Ioff and Power-Up 3-State Support Hot Insertion" bullet point.