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Texas Instruments SN74LVC2952ADW
- Part No.:
- SN74LVC2952ADW
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVC2952ADW.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,484
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Product details
Overview
SN74LVC2952ADW from Texas Instruments is an octal bus transceiver and register with 3-state outputs, designed for bidirectional data flow between two 8-bit buses in mixed-voltage systems. It operates from 1.65 V to 3.6 V, supports 5.5-V-tolerant inputs, delivers 8.2 ns max propagation delay at 3.3 V, and features Ioff partial-power-down protection. It is used in level-shifting interfaces between 3.3-V and 5-V logic domains in industrial control backplanes.
For engineers reviewing the SN74LVC2952ADW datasheet, SN74LVC2952ADW pinout, SN74LVC2952ADW application, or SN74LVC2952ADW equivalent, key selection criteria include its dual-clock-controlled register architecture, 24-pin SOIC (DW) package, 3.6-V absolute maximum input voltage rating, and guaranteed 150-MHz clock frequency support under specified conditions.
Technical Context
The SN74LVC2952ADW implements two independent 8-bit back-to-back registers enabling synchronous bidirectional data latching: A-to-B data is captured on the low-to-high CLKAB transition when CLKENAB is low, while B-to-A flow uses CLKBA/CLKENBA. Each direction has dedicated output-enable (OEAB/OEBA) controls for 3-state bus isolation.
Its mixed-mode signal operation allows 5-V inputs to be safely driven into a 3.3-V VCC system without external level shifters, and the Ioff circuitry actively disables outputs during power-down to prevent current backflow - critical for hot-swap and partial-power-down applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables direct integration into modern low-voltage digital systems while maintaining compatibility with legacy 3.3-V infrastructure. |
| Input Voltage Tolerance | Up to 5.5 V - permits direct connection to 5-V logic sources without clamping diodes or external resistors. |
| Max Propagation Delay | 8.2 ns at 3.3 V - ensures timing-critical data paths meet sub-10-ns budget requirements in high-speed bus interfaces. |
| Output Drive Strength | ±24 mA at 3 V - supports driving multiple CMOS loads or moderate capacitive bus traces without signal degradation. |
| 3-State Enable/Disable Time | 7.8 ns (ten/tdis) - minimizes bus contention windows during direction switching in time-multiplexed protocols. |
| Ioff Current | ±10 µA at 5.5 V - guarantees safe isolation of powered-down sections in multi-rail systems per JESD78. |
| Clock Frequency Support | 150 MHz - validates use in high-throughput parallel data transfer applications such as memory-mapped I/O or FPGA-to-ASIC bridging. |
Pinout & Package
SN74LVC2952ADW is housed in a 24-pin SOIC (DW) package with 0.65-mm lead pitch and 7.5-mm body width, compliant with JEDEC MS-013 and RoHS standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Port A data inputs/outputs | Bidirectional I/O pins for first 8-bit bus; 3-state controlled by OEAB and registered via CLKAB/CLKENAB. |
| B1–B8 | Port B data inputs/outputs | Bidirectional I/O pins for second 8-bit bus; 3-state controlled by OEBA and registered via CLKBA/CLKENBA. |
| CLKAB | A-to-B clock input | Edge-triggered latch enable for A-port data transfer to B-port on rising edge when CLKENAB = L. |
| CLKBA | B-to-A clock input | Edge-triggered latch enable for B-port data transfer to A-port on rising edge when CLKENBA = L. |
| CLKENAB | A-to-B clock enable | Active-low enable for CLKAB; when high, CLKAB is ignored and A-port data is not latched to B-port. |
| CLKENBA | B-to-A clock enable | Active-low enable for CLKBA; when high, CLKBA is ignored and B-port data is not latched to A-port. |
| OEAB | A-to-B output enable | Active-low control for 3-state output drivers on B-port; when high, B1–B8 enter high-impedance state. |
| OEBA | B-to-A output enable | Active-low control for 3-state output drivers on A-port; when high, A1–A8 enter high-impedance state. |
| VCC | Power supply | Core supply for internal logic and output drivers; must be decoupled locally with 0.1-µF ceramic capacitor. |
| GND | Ground reference | Common return path for all signals and power; requires low-inductance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage translation | Enables direct interfacing between 3.3-V and 5-V logic families without external components, reducing BOM count and board area. |
| Dual independent clock domains | Allows asynchronous or synchronized bidirectional data transfer - e.g., A-port can sample sensor data while B-port streams processed results to host MCU. |
| Ioff partial-power-down protection | Prevents damaging current flow when VCC = 0 V but I/O pins remain biased, meeting JESD78 latch-up immunity requirements (>250 mA). |
| Low ground bounce (VOLP < 0.8 V) | Reduces noise coupling into adjacent signal lines and power rails, improving signal integrity in dense PCB layouts. |
| ESD robustness | 2000-V HBM and 1000-V CDM ratings ensure reliability during handling and in-field operation without additional protection circuitry. |
Applications
| Industrial Backplane Interface | FPGA-to-MCU Data Bridge |
|---|---|
Use Scenario: Connecting a 5-V legacy PLC I/O module to a 3.3-V industrial controller CPU over a shared parallel bus. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver with registered data capture, synchronizing asynchronous bus transactions using separate CLKAB/CLKBA edges. Use Value: Eliminates need for discrete level shifters and glue logic, reducing component count and timing uncertainty in deterministic real-time control loops. | Use Scenario: Interfacing a Xilinx Artix-7 FPGA's general-purpose I/O bank (3.3-V tolerant) with a TI C2000 microcontroller operating at 1.8-V core but 3.3-V I/O. IC Role / Device Role / Timing Role: Registered bus interface providing setup/hold margin for FPGA-to-MCU handshaking, with independent OE control for dynamic bus ownership arbitration. Use Value: Enables reliable high-speed data exchange (up to 150 MHz) while isolating power domains and preventing cross-rail leakage during MCU sleep modes. |
| Memory-Mapped Peripheral Expansion | Hot-Swappable Module Interface |
Use Scenario: Adding external SRAM or flash memory to a 3.3-V SoC via a multiplexed address/data bus where memory operates at 5-V. IC Role / Device Role / Timing Role: Octal transceiver with register staging to align memory read/write cycles with SoC clock domain, minimizing wait states. Use Value: Achieves full bus bandwidth utilization without external clock dividers or FIFOs, supporting burst transfers up to 120 MB/s at 150 MHz. | Use Scenario: Enabling hot-plug insertion of field-replaceable modules in telecom line cards where main backplane runs at 3.3-V but module logic is 5-V. IC Role / Device Role / Timing Role: Ioff-enabled isolation device that maintains high-impedance state during power sequencing, preventing bus contention during insertion/removal. Use Value: Meets GR-63-CORE reliability requirements for zero-downtime maintenance by eliminating risk of supply rail shorting or latch-up during live swaps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC2952APWR | TSSOP-24 (PW) package vs. SOIC-24 (DW); identical electrical specs and pinout; 1.2-mm max height vs. 2.65-mm SOIC profile. | Better suited for space-constrained PCBs requiring fine-pitch surface-mount assembly and automated optical inspection. | Select SN74LVC2952APWR when board real estate is limited and reflow-compatible footprint is preferred over through-hole or larger SOIC. |
| SN74ALVC162952DGGR | 16-bit (dual-octal), higher drive (±24 mA), same VCC range; different pinout (56-pin TSSOP), no Ioff support. | Designed for wider data buses (e.g., 16-bit memory interfaces); lacks Ioff, limiting use in partial-power-down systems. | Choose SN74ALVC162952DGGR only for 16-bit parallel expansion where Ioff is not required and layout accommodates larger package. |
Compared with SN74LVC2952APWR, the SN74LVC2952ADW offers greater mechanical robustness and thermal mass in SOIC packaging, while SN74ALVC162952DGGR provides double the data width at the cost of pin compatibility and Ioff functionality - making SN74LVC2952ADW optimal for 8-bit mixed-voltage interconnects requiring power-aware design.
Availability
SN74LVC2952ADW is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA-to-MCU bridging, and memory-mapped peripheral expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC2952ADW 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVC2952ADW belongs to TI's LVC logic family, engineered for low-voltage, high-speed, mixed-signal interoperability in next-generation digital systems where power efficiency and voltage translation are critical.
FAQ
What is the maximum clock frequency supported by the SN74LVC2952ADW?
The SN74LVC2952ADW supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 2.7 V to 3.3 V, TA = –40°C to 85°C). This value is verified in the Switching Characteristics table of the official datasheet and applies to both CLKAB and CLKBA inputs when CLKENAB/CLKENBA are asserted low. Timing margins must be validated against actual load capacitance and PCB trace impedance in the target application.
Does the SN74LVC2952ADW support true 5-V operation on VCC?
No, the SN74LVC2952ADW does not support 5-V VCC operation. Its absolute maximum VCC rating is 6.5 V, but the recommended operating range is strictly 1.65 V to 3.6 V. However, its inputs tolerate up to 5.5 V regardless of VCC level - enabling safe connection to 5-V signal sources while powered from 3.3-V or lower supplies. Operating VCC above 3.6 V voids specifications and risks permanent damage.
How does the Ioff feature function in the SN74LVC2952ADW?
The Ioff feature in the SN74LVC2952ADW disables all output drivers when VCC = 0 V, limiting input/output leakage current to ±10 µA even if external voltages up to 5.5 V are present on A or B pins. This prevents reverse current flow into a powered-down supply rail - a requirement for hot-swap and partial-power-down architectures. The feature is inherent to the silicon process and requires no external configuration or enable signals.
Can the SN74LVC2952ADW be used without external pull-up resistors on OEAB and OEBA?
Yes, the SN74LVC2952ADW can operate without external pull-ups on OEAB/OEBA, but doing so risks undefined output states during power-up or brownout. TI recommends tying OEAB and OEBA to VCC through pull-up resistors (value determined by driver sink capability) to guarantee high-impedance outputs until firmware asserts active-low control. Omitting pull-ups may cause bus contention or unintended data latching during reset sequences.
Is the SN74LVC2952ADW pin-compatible with the older SN74LVC2952A variant?
Yes, the SN74LVC2952ADW is functionally and pin-compatible with the base SN74LVC2952A part number across all packages, including SOIC (DW). The "D" suffix denotes the SOIC package, and the "W" indicates tape-and-reel packaging - both share identical pinout, electrical characteristics, and timing behavior per the SCAS311I datasheet revision. No PCB layout changes are needed when upgrading from earlier production lots.
SN74LVC2952ADW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 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
SN74LVC2952ADW FAQ
1.How can I place an order for SN74LVC2952ADW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC2952ADW 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 SN74LVC2952ADW reliable?
The price and inventory of SN74LVC2952ADW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC2952ADW is usually 5 days.
3.What payment methods are accepted for SN74LVC2952ADW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC2952ADW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC2952ADW?
SN74LVC2952ADW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC2952ADW 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 SN74LVC2952ADW?
For technical support, including SN74LVC2952ADW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC2952ADW requirements.
6.How does Aetrix verify that SN74LVC2952ADW is sourced from the original manufacturer or authorized distributors?
All SN74LVC2952ADW 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 SN74LVC2952ADW meets industry standards.
7.What is the process for return or replacement of SN74LVC2952ADW?
All SN74LVC2952ADW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC2952ADW, 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 SN74LVC2952ADW part is unused and in its original packaging.
Return procedure for SN74LVC2952ADW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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