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Texas Instruments SN74LVTH652DBR
- Part No.:
- SN74LVTH652DBR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH652DBR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,572
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Product details
Overview
SN74LVTH652DBR 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 data inputs, operates down to 2.7 V, and delivers 64 mA sink current per output - used in backplane interface logic and legacy system bridging.
For engineers reviewing the SN74LVTH652DBR datasheet, SN74LVTH652DBR pinout, SN74LVTH652DBR application, or SN74LVTH652DBR equivalent, this page provides verified functional identity, TSSOP-24 package mapping, timing-critical parameters (tPLH/tPHL ≤ 5.6 ns at 3.3 V), bus-hold behavior, and two confirmed alternative parts for 3.3-V/5-V bidirectional bus management.
Technical Context
The SN74LVTH652DBR integrates two independent 8-bit transceivers with edge-triggered D-type flip-flops per direction (A↔B), enabling simultaneous storage and forwarding. Its select-control logic (SAB/SBA) eliminates multiplexer glitches during mode transitions between real-time and registered data paths.
It supports true hot-swap operation: Ioff limits reverse current when powered down, and power-up 3-state ensures outputs remain high-impedance until VCC exceeds 1.5 V. Bus-hold circuitry maintains valid logic states on floating A/B inputs without external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - enables stable operation under unregulated battery supply or noisy rail conditions. |
| IOL / IOH | 64 mA / −32 mA - drives standard TTL loads directly without buffers in mixed-voltage systems. |
| Propagation Delay | tPLH/tPHL ≤ 5.6 ns (CL = 50 pF, VCC = 3.3 V) - supports ≥150 MHz clock frequency for high-speed bus arbitration. |
| Bus-Hold Current | ±500 µA (VCC = 3.6 V) - actively holds unused data lines at valid logic levels, eliminating pullup/pulldown resistors. |
| Input Voltage Tolerance | VI up to 5.5 V - accepts 5-V TTL signals while powered from 3.3-V rail, enabling seamless level translation. |
| Hot-Insertion Support | Ioff ≤ ±100 µA at VCC = 0 - prevents damaging backflow current during live board insertion or removal. |
Pinout & Package
TSSOP-24 package (PW footprint, 0.65 mm pitch, 7.9 mm × 4.5 mm body, 1.2 mm max height) with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4–11, 14–21 | A1–A8, B1–B8 data I/O | Bi-directional bus terminals with integrated bus-hold; no external termination required. |
| 3, 13, 15, 22 | OEAB, OEBA, SAB, SBA | Active-low output enable and select control inputs - determine real-time vs. stored data path selection. |
| 12, 24 | GND, VCC | Power reference and supply pins - decoupling capacitor placement critical for ground bounce reduction (VOLP < 0.8 V). |
| 23, 16 | CLKAB, CLKBA | Positive-edge clock inputs - trigger simultaneous latching of A or B bus data into internal D-flip-flops. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | Accepts 5-V TTL inputs and drives 5-V loads while operating from 3.3-V VCC - eliminates external level shifters. |
| Glitch-free select control | SAB/SBA logic prevents transient invalid states during real-time ↔ stored data mode switching - improves bus reliability. |
| Integrated bus-hold | Eliminates need for 10-kΩ pullup/pulldown resistors on A/B data lines - reduces BOM count and PCB area. |
| Hot-insertion capability | Ioff + power-up 3-state ensure safe insertion into live backplanes - prevents system disruption or component damage. |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V - maintains signal integrity in dense, high-speed digital systems. |
Applications
| Industrial Backplane Interface | Legacy System Bridging |
|---|---|
Use Scenario: Interfacing 3.3-V FPGA-based control modules with legacy 5-V ISA or VMEbus peripherals in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional bus transceiver with register storage - isolates voltage domains while buffering and synchronizing data transfers. Use Value: Enables direct connection without discrete level shifters; bus-hold prevents floating inputs during reset or configuration gaps. | Use Scenario: Upgrading aging test equipment mainframes by replacing obsolete 5-V transceivers with modern low-power equivalents. IC Role / Device Role / Timing Role: Drop-in-compatible octal transceiver with storage - retains original timing margins while reducing power and improving noise immunity. Use Value: Maintains existing PCB layout and firmware; 2.7–3.6 V operation extends battery life in portable diagnostic units. |
| Hot-Swappable Module Carrier | High-Density Data Acquisition Hub |
Use Scenario: Carrier board for modular I/O cards in telecom shelf systems requiring live insertion/removal without chassis power-down. IC Role / Device Role / Timing Role: Isolation and state retention element - manages data flow between card-edge connectors and backplane during hot-swap events. Use Value: Ioff and power-up 3-state prevent bus contention and backfeed; registered mode captures status before module removal. | Use Scenario: Central aggregation node in multi-channel sensor networks where analog front-ends output digitized data to a 3.3-V processor over shared parallel buses. IC Role / Device Role / Timing Role: Synchronized bus buffer with latch capability - aligns asynchronous sensor reads and prevents metastability in burst transfers. Use Value: Real-time + stored modes allow concurrent acquisition and processing; 150 MHz clock support handles high-sample-rate streams. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver with register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVT652DBR | No bus-hold; requires external pullups; lower drive strength (IOL = 32 mA). | Suitable only where input termination is already provided and load drive is lighter. | Select when cost sensitivity outweighs bus-hold convenience and higher drive is unnecessary. |
| SN74LVTH16245ADGGR | 16-bit, non-registering, no SAB/SBA control; separate A/B OE pins. | Better for pure bidirectional buffering without storage; incompatible with register-dependent protocols. | Choose for wider bus width and simpler control, but not for applications requiring glitch-free mode switching or data capture. |
Compared with SN74LVT652DBR, the SN74LVTH652DBR adds bus-hold and stronger drive for robustness in unterminated environments; versus SN74LVTH16245ADGGR, it trades bit width for integrated storage and deterministic select logic - critical for protocol-aware bus management.
Availability
SN74LVTH652DBR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system upgrades, and hot-swappable carrier boards requiring stable component supply across extended temperature ranges (−40°C to 85°C).
Supply support for SN74LVTH652DBR 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74LVTH652DBR belongs to TI's LVTH logic family, designed specifically for mixed-voltage system interfacing with emphasis on hot-swap safety, bus integrity, and reduced external component count.
FAQ
What is the function of the SAB and SBA pins on the SN74LVTH652DBR?
The SAB and SBA pins on the SN74LVTH652DBR are select-control inputs that determine whether real-time or stored data is transferred between the A and B buses. A low level selects real-time data; a high level selects data previously latched into the internal D-type flip-flops. This architecture eliminates multiplexer glitches during mode transitions - a key feature confirmed in the SN74LVTH652DBR functional table and logic diagram.
Does the SN74LVTH652DBR require external pullup or pulldown resistors on its data inputs?
No, the SN74LVTH652DBR does not require external pullup or pulldown resistors on its A1–A8 or B1–B8 inputs because it includes active bus-hold circuitry. This feature maintains unused or floating inputs at valid logic levels, as explicitly stated in the device description and electrical characteristics table (II(hold) ±500 µA at VCC = 3.6 V). Using external resistors with SN74LVTH652DBR is not recommended.
Can the SN74LVTH652DBR operate safely during live insertion into a powered backplane?
Yes, the SN74LVTH652DBR supports hot insertion via two dedicated features: Ioff circuitry disables outputs when VCC = 0, preventing damaging current backflow, and power-up 3-state holds outputs in high-impedance until VCC exceeds 1.5 V. These capabilities are fully specified in the absolute maximum ratings and recommended operating conditions sections of the SN74LVTH652DBR datasheet.
What is the maximum clock frequency supported by the SN74LVTH652DBR?
The SN74LVTH652DBR supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 3.3 V ± 0.3 V, TA = 25°C), as specified in the timing requirements table. This value is validated by propagation delay measurements (tPLH/tPHL ≤ 5.6 ns) and pulse width constraints (tw ≥ 3.3 ns) in the SN74LVTH652DBR datasheet.
Is the SN74LVTH652DBR pin-compatible with other packages in the LVTH652 family?
Yes, the SN74LVTH652DBR (TSSOP-24) shares identical pinout and functionality with other LVTH652 variants in SOIC (DW), SSOP (NS), and TSSOP (PW) packages, as confirmed by the "SN74LVTH652 . . . DB, DGV, DW, NS, OR PW PACKAGE" header and consistent pin numbering across package drawings in the SN74LVTH652DBR datasheet.
SN74LVTH652DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
SN74LVTH652DBR FAQ
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Please submit a Request for Quotation (RFQ) for SN74LVTH652DBR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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Once your SN74LVTH652DBR order is processed, you will receive an email with the shipment details and tracking number.
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5.How can I obtain technical support or documentation for SN74LVTH652DBR?
For technical support, including SN74LVTH652DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH652DBR requirements.
6.How does Aetrix verify that SN74LVTH652DBR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH652DBR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74LVTH652DBR meets industry standards.
7.What is the process for return or replacement of SN74LVTH652DBR?
All SN74LVTH652DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH652DBR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74LVTH652DBR part is unused and in its original packaging.
Return procedure for SN74LVTH652DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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