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Texas Instruments SN74LVC652APWT
- Part No.:
- SN74LVC652APWT
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC652APWT.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:717
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Product details
Overview
SN74LVC652APWT 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 delivers 7.4 ns max propagation delay at 3.3 V - used in FPGA-to-ASIC interconnects, memory interface buffering, and industrial controller backplanes.
For engineers reviewing the SN74LVC652APWT datasheet, SN74LVC652APWT pinout, SN74LVC652APWT application, or SN74LVC652APWT equivalent, key selection criteria include its dual-register architecture, Ioff partial-power-down support, 5.5-V-tolerant inputs, 24-pin TSSOP package, and compatibility with 1.8-V/2.5-V/3.3-V logic domains in high-density PCB layouts.
Technical Context
The SN74LVC652APWT integrates eight independent bidirectional channels, each with D-type flip-flops on both A and B ports, enabling simultaneous storage of data from either bus or both buses. Its dual-clock design (CLKAB for A→B, CLKBA for B→A) and independent select (SAB/SBA) and output-enable (OEAB/OEBA) controls eliminate multiplexer glitches during mode transitions.
It implements true 3-state outputs with Ioff circuitry that disables all outputs when VCC = 0 V, preventing backflow current in partial-power-down systems. Input tolerance up to 5.5 V allows direct interfacing with legacy 5-V peripherals while powered from 1.65–3.6 V supplies - critical for voltage translation in mixed-signal embedded subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables operation across 1.8-V, 2.5-V, and 3.3-V logic families without level shifters. |
| Max tpd | 7.4 ns at VCC = 3.3 V - ensures sub-10-ns timing margin for 100-MHz bus clocking in synchronous interfaces. |
| Input Voltage Tolerance | Up to 5.5 V - permits direct connection to 5-V TTL outputs without external clamping or resistors. |
| Ioff Support | Active at VCC = 0 V - blocks current flow between powered and unpowered system domains during hot-swap or power sequencing. |
| Output Drive | ±24 mA at VCC = 3.0 V - drives standard 50-Ω transmission lines or loads up to 10 LVTTL inputs. |
| Package | TSSOP-24 (PW), 4.4 mm × 7.8 mm footprint - fits high-density routing with 0.65-mm lead pitch and exposed pad-compatible layout. |
| Operating Temp | –40°C to +85°C - qualified for industrial-grade embedded control, motor drives, and programmable logic interfaces. |
Pinout & Package
TSSOP-24 (PW) package: 4.4 mm width, 7.8 mm length, 1.2 mm max height, 0.65 mm lead pitch, gull-wing leads, no exposed thermal pad. Pin 1 index located at top-left corner with molded dot; pin numbering follows standard counter-clockwise sequence.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLKAB) | Asynchronous clock input | Triggers storage of A-bus data into internal DFFs for transfer to B bus on rising edge. |
| 2 (SAB) | Select control input | Low = real-time A→B transfer; high = stored A-data transfer - eliminates glitch during mode switching. |
| 3 (OEAB) | Output enable for A→B path | Low enables B-port outputs; high forces high-impedance - used for bus arbitration and isolation. |
| 4–11 (A1–A8) | A-side bidirectional I/O | Connect to source bus; direction determined by OEAB/SAB state and clock activity. |
| 12 (GND) | Power ground | Primary reference for all logic thresholds and output drive; must be low-inductance plane connection. |
| 13 (VCC) | Supply voltage | 1.65–3.6 V digital supply; decoupling capacitor required within 5 mm of pin. |
| 14 (CLKBA) | Asynchronous clock input | Triggers storage of B-bus data into internal DFFs for transfer to A bus on rising edge. |
| 15 (SBA) | Select control input | Low = real-time B→A transfer; high = stored B-data transfer - independent of SAB for full duplex control. |
| 16 (OEBA) | Output enable for B→A path | Low enables A-port outputs; high forces high-impedance - enables bidirectional bus sharing. |
| 17–24 (B1–B8) | B-side bidirectional I/O | Connect to destination bus; driven by A data (real-time or registered) when OEBA = low. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent register banks | Enables concurrent capture of A- and B-bus data on separate clocks - supports ping-pong buffering in DMA controllers. |
| Mixed-mode voltage translation | 5.5-V-tolerant inputs + 1.65–3.6-V VCC allow seamless bridging between 5-V legacy peripherals and modern low-voltage FPGAs. |
| Glitch-free select control | SAB/SBA logic prevents metastability and transient shorts during real-time ↔ stored data mode transitions. |
| Ioff partial-power-down protection | Outputs disable automatically when VCC = 0 V - eliminates risk of backfeeding in modular systems with staggered power rails. |
| High-speed 3-state outputs | 7.4 ns max tpd and ±24 mA drive support 100-MHz bus cycles with clean signal integrity on FR4 PCBs. |
Applications
| Industrial PLC Backplane Interface | FPGA-to-ASIC Data Bridge |
|---|---|
Use Scenario: Isolating and synchronizing data between a 3.3-V FPGA I/O bank and a 2.5-V ASIC processor over a shared 8-bit parallel bus in a programmable logic controller. IC Role / Device Role / Timing Role: Bidirectional bus transceiver with register staging - captures FPGA output on CLKAB, holds it stable during ASIC read cycle, then transfers on demand. Use Value: Eliminates external latch ICs and reduces PCB layer count by integrating register + transceiver + voltage translation in one 24-pin TSSOP device. | Use Scenario: Buffering configuration data from a 1.8-V microcontroller to a 3.3-V CPLD during power-up sequencing in a smart sensor node. IC Role / Device Role / Timing Role: Level-translating octal register - accepts 5-V-tolerant MCU outputs, stores data on CLKBA, and presents clean 3.3-V signals to CPLD inputs. Use Value: Enables reliable bootloading without discrete level shifters or pull-up networks, reducing BOM cost and layout area by >30%. |
| Memory Expansion Interface | Test Equipment Bus Arbitration |
Use Scenario: Extending SRAM address/data bus between two microcontrollers operating at different supply voltages in a dual-CPU diagnostic module. IC Role / Device Role / Timing Role: Registered bidirectional transceiver - latches address from CPU-A on CLKAB, holds during CPU-B access, and drives SRAM bus with registered timing. Use Value: Removes setup/hold time violations caused by trace skew, allowing reliable 80-MHz SRAM access across 10-cm PCB runs. | Use Scenario: Managing shared JTAG or SPI debug bus among multiple test instruments in automated test equipment (ATE) racks. IC Role / Device Role / Timing Role: 3-state bus isolator with register hold - prevents bus contention during instrument handover and maintains last valid command state. Use Value: Guarantees deterministic bus recovery after hot-swap events, eliminating test aborts due to floating bus states. |
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 |
|---|---|---|---|
| SN74LVC652ADWR | Same die, SOIC-24 package (DW); larger footprint (8.65 mm × 3.9 mm), higher θJA (46°C/W). | Preferred for through-hole prototyping or legacy board rework where TSSOP reflow is unavailable. | Select when manual soldering, thermal derating above 70°C, or compatibility with existing DW-footprint layouts is required. |
| SN74ALVC16652DGGR | 16-bit version in TSSOP-48; identical VCC range, Ioff, and 5.5-V input tolerance but double channel count. | Used in wider data paths (e.g., 16-bit microprocessor buses) requiring same register+transceiver functionality. | Choose when scaling to 16-bit width is needed - not a drop-in replacement due to pin count and layout incompatibility. |
Compared with SN74LVC652ADWR and SN74ALVC16652DGGR, the SN74LVC652APWT offers optimal density for 8-bit systems with minimal board space (4.4 mm × 7.8 mm), superior thermal performance in compact enclosures, and direct compatibility with fine-pitch automated assembly processes.
Availability
SN74LVC652APWT is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA-to-ASIC bridges, memory expansion interfaces, test equipment bus arbitration, and mixed-voltage sensor hub designs requiring stable component supply and long-term manufacturability.
Supply support for SN74LVC652APWT 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 SN74LVC652APWT belongs to TI's LVC logic family - engineered for low-voltage, high-speed bidirectional bus management in space-constrained industrial and communications systems.
FAQ
What is the maximum clock frequency supported by the SN74LVC652APWT?
The SN74LVC652APWT supports a maximum clock frequency of 100 MHz at VCC = 3.3 V, as specified in the timing characteristics 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 final implementation of the SN74LVC652APWT.
Does the SN74LVC652APWT 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. The minimum resistance value depends on the driving source's current-sinking/sourcing capability, per TI's application guidance for the SN74LVC652APWT.
Can the SN74LVC652APWT interface directly with 5-V logic devices?
Yes - the SN74LVC652APWT features 5.5-V-tolerant inputs, allowing direct connection to 5-V CMOS/TTL outputs without level-shifting circuitry. Its outputs swing rail-to-rail within the 1.65–3.6-V VCC range, so external termination or translation is required only if the receiving device demands 5-V signaling - a key advantage of the SN74LVC652APWT in mixed-voltage systems.
What is the purpose of the Ioff feature in the SN74LVC652APWT?
The Ioff feature in the SN74LVC652APWT disables all outputs when VCC = 0 V, preventing damaging current backflow from live buses into the unpowered device. This supports safe partial-power-down operation in modular systems - for example, when one board is hot-swapped while adjacent modules remain active - a critical reliability function built into the SN74LVC652APWT silicon.
How does the SN74LVC652APWT handle simultaneous real-time and stored data transfer?
The SN74LVC652APWT does not support simultaneous real-time and stored transfer on the same port. However, it enables concurrent operation: real-time A→B transfer (with OEAB low, SAB low) while storing new B-bus data (on CLKBA rising edge), or vice versa - managed via independent SAB/SBA and OEAB/OEBA controls. This flexibility is explicitly documented in the function table for the SN74LVC652APWT.
SN74LVC652APWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-TSSOP
SN74LVC652APWT FAQ
1.How can I place an order for SN74LVC652APWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC652APWT 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 SN74LVC652APWT reliable?
The price and inventory of SN74LVC652APWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC652APWT is usually 5 days.
3.What payment methods are accepted for SN74LVC652APWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC652APWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC652APWT?
SN74LVC652APWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC652APWT 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 SN74LVC652APWT?
For technical support, including SN74LVC652APWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC652APWT requirements.
6.How does Aetrix verify that SN74LVC652APWT is sourced from the original manufacturer or authorized distributors?
All SN74LVC652APWT 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 SN74LVC652APWT meets industry standards.
7.What is the process for return or replacement of SN74LVC652APWT?
All SN74LVC652APWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC652APWT, 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 SN74LVC652APWT part is unused and in its original packaging.
Return procedure for SN74LVC652APWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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