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Texas Instruments SN74LVC652ADW
- Part No.:
- SN74LVC652ADW
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVC652ADW.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LVC652ADW 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 real-time or registered data transfer via dual clocks (CLKAB/CLKBA) and select controls (SAB/SBA), and features Ioff partial-power-down protection. It is used in industrial backplane interfaces requiring glitch-free bus arbitration and voltage-level translation.
For engineers reviewing the SN74LVC652ADW datasheet, SN74LVC652ADW pinout, SN74LVC652ADW application, or SN74LVC652ADW equivalent, key selection considerations include its 24-pin SOIC-DW package, 7.4 ns max propagation delay at 3.3 V, 3.6 V absolute maximum input tolerance, Ioff-enabled power sequencing, and dual-register architecture enabling simultaneous A→B and B→A stored-data transfer.
Technical Context
The SN74LVC652ADW integrates eight independent bidirectional transceiver channels with D-type flip-flops per channel, allowing either real-time pass-through or clocked registration of data on either bus. Its dual-clock architecture (CLKAB for A-to-B, CLKBA for B-to-A) and independent select (SAB/SBA) and output-enable (OEAB/OEBA) controls enable four distinct bus-management modes without decoding glitches.
It implements TI's LVC logic family characteristics: TTL-compatible thresholds across 1.65–3.6 V VCC, 5.5 V-tolerant inputs, and Ioff circuitry that disables outputs and blocks current backflow during power-down-critical for hot-swap and partial-power-down systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables operation in low-voltage embedded systems and compatibility with 1.8 V, 2.5 V, and 3.3 V domains. |
| Max Propagation Delay | 7.4 ns at VCC = 3.3 V - Supports high-speed bus handshaking up to ~100 MHz clock frequency in registered mode. |
| Input Voltage Tolerance | 0 V to 5.5 V - Allows direct interfacing with 5-V legacy peripherals without level shifters in mixed-voltage designs. |
| Ioff Support | Yes - Prevents damaging current flow when VCC = 0 V, enabling safe insertion/removal in powered-backplane applications. |
| Output Drive Strength | ±24 mA at VCC = 3.0 V - Sufficient to drive standard 50-Ω transmission lines or multiple CMOS loads without external buffers. |
| Package | SOIC-24 (DW) - Industry-standard 7.5-mm wide body with 1.27-mm pitch; compatible with automated assembly and IPC-7351 land patterns. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade deployment in programmable logic controllers and motor drives. |
Pinout & Package
SN74LVC652ADW uses a 24-pin SOIC (DW) package with 1.27-mm lead pitch and 7.5-mm body width. Pin 1 is located at the top-left corner adjacent to the index notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLKAB) | A-to-B clock input | Low-to-high edge stores A-bus data into internal register and enables transfer to B bus when SAB = H and OEAB = L. |
| 2 (SAB) | A-to-B select control | H selects stored A data; L selects real-time A data - eliminates multiplexer glitches during mode transitions. |
| 3 (OEAB) | A-to-B output enable | L enables B-bus drivers; H places B outputs in high-impedance - critical for bus contention avoidance. |
| 4–11 (A1–A8) | A-bus I/O terminals | Bidirectional data ports; inputs always active, outputs enabled only when OEAB = L or OEBA = L per direction. |
| 12 (GND) | Ground reference | Primary return path for all signals and power; must be low-inductance connection to minimize ground bounce (VOLP < 0.8 V). |
| 13 (VCC) | Supply voltage | 1.65–3.6 V core supply; decoupling capacitor required within 1 cm to suppress switching noise. |
| 14 (CLKBA) | B-to-A clock input | Low-to-high edge stores B-bus data and enables transfer to A bus when SBA = H and OEBA = L. |
| 15 (SBA) | B-to-A select control | H selects stored B data; L selects real-time B data - independently configurable from SAB for asymmetric bus control. |
| 16 (OEBA) | B-to-A output enable | L enables A-bus drivers; H places A outputs in high-Z - allows independent tri-state control of each bus direction. |
| 17–24 (B1–B8) | B-bus I/O terminals | Bidirectional ports mirroring A1–A8; support concurrent A↔B registered transfers when both OEAB and OEBA are active. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clock domains | Separate CLKAB and CLKBA inputs allow asynchronous registration and transfer between A and B buses - essential for bridging mismatched timing domains. |
| Glitch-free select control | SAB/SBA logic eliminates metastability and transient shorts during real-time ↔ stored data mode switching - improves system reliability in deterministic bus arbitration. |
| Mixed-voltage I/O tolerance | All inputs tolerate 0–5.5 V regardless of VCC setting - enables direct connection to 5-V sensors or legacy controllers in 3.3-V systems without external translators. |
| Ioff partial-power-down protection | Outputs automatically enter high-Z and block reverse current when VCC = 0 V - satisfies IEC 61000-4-2 ESD immunity requirements and supports hot-plug backplanes. |
| Simultaneous dual-direction transfer | When OEAB = OEBA = L and SAB = SBA = H, stored A data appears on B bus while stored B data appears on A bus - enables full-duplex register-to-register communication. |
Applications
| Industrial Backplane Interface | Programmable Logic Controller (PLC) I/O Module |
|---|---|
Use Scenario: Interfacing FPGA-based main controller with multiple 8-bit sensor/actuator daughter cards over a shared parallel bus. IC Role / Device Role / Timing Role: Bidirectional bus transceiver and register providing isolated, glitch-free data routing and local storage for command buffering and status latching. Use Value: Eliminates need for discrete latches and direction-control logic; reduces PCB area by 40% versus discrete 74LVC245 + 74LVC374 solution. | Use Scenario: Isolating CPU bus from field-side digital I/O expansion modules operating at different voltage levels (e.g., 3.3-V CPU, 5-V sensors). IC Role / Device Role / Timing Role: Voltage-translating octal transceiver with register capability, enabling synchronized capture of field inputs and timed output updates. Use Value: 5.5-V input tolerance removes external level shifters; Ioff prevents backfeed during module hot-swap - meets IEC 61131-2 safety requirements. |
| Test Equipment Data Acquisition Bus | Automated Test Fixture Control |
Use Scenario: Aggregating parallel data streams from multiple ADC/DAC boards into a central processing unit in benchtop instrumentation. IC Role / Device Role / Timing Role: Registered bus interface synchronizing asynchronous peripheral data to system clock domain using CLKAB/CLKBA edges. Use Value: 7.4 ns tpd ensures sub-10 ns sampling alignment; dual-register mode allows pipelined acquisition where one register captures while another transfers. | Use Scenario: Controlling 16-channel relay and LED driver banks from a microcontroller with limited GPIO, using time-multiplexed bus access. IC Role / Device Role / Timing Role: Octal transceiver acting as bidirectional GPIO expander with local storage for output state retention during MCU sleep cycles. Use Value: Internal D-flip-flops maintain relay states without MCU intervention; OEAB/OEBA enable dynamic bus sharing among multiple fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC652APW | TSSOP-24 package (4.4-mm width); identical electrical specs and pinout mapping but smaller footprint and higher thermal resistance (θJA = 88°C/W vs. 46°C/W). | Preferred for space-constrained PCBs where thermal load is low; not suitable for >50 mA continuous output current in ambient >70°C. | Select SN74LVC652APW when board area is critical and thermal derating is acceptable; use SN74LVC652ADW for industrial environments requiring robust thermal performance. |
| SN74ALVC16652DGGR | 16-bit (dual-octal) version in 48-pin TSSOP; supports higher throughput but requires two control sets and occupies 2.5× PCB area. | Used in high-channel-count systems like modular DAQ chassis; lacks pin compatibility and requires layout redesign. | Choose SN74ALVC16652DGGR only when doubling bus width is required; SN74LVC652ADW remains optimal for cost- and size-sensitive 8-bit implementations. |
Compared with SN74LVC652APW, SN74LVC652ADW offers superior thermal dissipation and mechanical robustness in industrial vibration environments, while SN74ALVC16652DGGR provides scalable bandwidth at the expense of layout compatibility and component count - making SN74LVC652ADW the balanced choice for most 8-bit registered bus applications.
Availability
SN74LVC652ADW is available at Aetrix Electronics and suitable for industrial automation, test equipment, and programmable logic controller applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for SN74LVC652ADW 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 SN74LVC652ADW belongs to TI's LVC logic family, engineered for low-voltage, mixed-signal bus interfacing in industrial and automotive systems where voltage translation, power sequencing, and deterministic timing are critical.
FAQ
What is the maximum clock frequency supported by the SN74LVC652ADW?
The SN74LVC652ADW supports a maximum clock frequency of 100 MHz at VCC = 3.3 V, as specified in the timing requirements table. At lower supply voltages (e.g., 1.8 V), the maximum usable frequency decreases due to increased propagation delay; design validation at target VCC and temperature is recommended before finalizing timing margins for the SN74LVC652ADW.
Does the SN74LVC652ADW require external pull-up or pull-down resistors on its control pins?
Yes - to ensure defined high-impedance states during power-up/power-down, OEBA should be tied to VCC via a pull-up resistor and OEAB to GND via a pulldown resistor. TI recommends minimum values based on driver strength; for the SN74LVC652ADW, 10-kΩ is typical. Uncontrolled floating control pins risk undefined bus states and potential latch-up.
Can the SN74LVC652ADW interface between a 3.3-V microcontroller and a 5-V peripheral without external level shifters?
Yes - the SN74LVC652ADW accepts input voltages up to 5.5 V regardless of VCC (1.65–3.6 V), enabling direct connection of 5-V peripherals to its A or B ports. Its outputs swing rail-to-rail within VCC, so 3.3-V logic levels are delivered to the microcontroller. This dual-voltage capability is intrinsic to the SN74LVC652ADW and requires no external components.
What is the purpose of the Ioff feature in the SN74LVC652ADW?
The Ioff feature in the SN74LVC652ADW disables output drivers and blocks current flow when VCC = 0 V, preventing damaging back-current from live buses into a powered-down device. This supports partial-power-down architectures and hot-swap capability - a critical requirement for modular systems where the SN74LVC652ADW may be inserted or removed while other subsystems remain active.
Is the SN74LVC652ADW pin-compatible with other packages in the same family?
Yes - the SN74LVC652ADW (SOIC-DW), SN74LVC652APW (TSSOP-PW), and SN74LVC652ADBR (SSOP-DB) share identical pin functions and numbering. However, mechanical dimensions, thermal performance, and soldering profiles differ; PCB layout must match the selected package. The SN74LVC652ADW specifically uses the 24-pin SOIC-DW outline per TI package drawing DW0024A.
SN74LVC652ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74LVC652ADW FAQ
1.How can I place an order for SN74LVC652ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC652ADW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74LVC652ADW reliable?
The price and inventory of SN74LVC652ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC652ADW is usually 5 days.
3.What payment methods are accepted for SN74LVC652ADW?
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4.How is shipping managed for SN74LVC652ADW?
SN74LVC652ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC652ADW order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74LVC652ADW?
For technical support, including SN74LVC652ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC652ADW requirements.
6.How does Aetrix verify that SN74LVC652ADW is sourced from the original manufacturer or authorized distributors?
All SN74LVC652ADW 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 SN74LVC652ADW meets industry standards.
7.What is the process for return or replacement of SN74LVC652ADW?
All SN74LVC652ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC652ADW, 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 SN74LVC652ADW part is unused and in its original packaging.
Return procedure for SN74LVC652ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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