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Texas Instruments SN74LVC2952APW
- Part No.:
- SN74LVC2952APW
- Manufacturer:
- Texas Instruments
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC2952APW.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LVC2952APW 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 SN74LVC2952APW datasheet, SN74LVC2952APW pinout, SN74LVC2952APW application, or SN74LVC2952APW equivalent, key selection criteria include its dual-clock-register architecture, 24-pin TSSOP package, 3.3-V/5-V mixed-mode signal compatibility, and guaranteed 3-state enable/disable timing (ten/tdis ≤ 7.8 ns at 3.3 V).
Technical Context
The SN74LVC2952APW implements two independent 8-bit back-to-back registers: one latching A→B data on CLKAB's low-to-high transition when CLKENAB is low, the other latching B→A data on CLKBA's low-to-high transition when CLKENBA is low. Each direction has dedicated output-enable (OEAB/OEBA) controls that place respective ports in high-impedance state.
Its Ioff circuitry actively disables outputs during power-down, blocking reverse current flow, while input tolerance up to 5.5 V enables direct interfacing with legacy 5-V peripherals without external level shifters - a critical capability in brownfield system upgrades and multi-supply FPGA I/O banks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables operation across LVC-family voltage rails including 1.8-V, 2.5-V, and 3.3-V systems. |
| Input Voltage Tolerance | Up to 5.5 V - Allows safe connection to 5-V CMOS/TTL outputs without clamping diodes or external resistors. |
| tpd (Max) | 8.2 ns at VCC = 3.3 V - Supports >100-MHz bus clocking with deterministic timing margins in synchronous backplane designs. |
| Ioff Current | ±10 µA at VI/VO = 5.5 V - Ensures zero-current backflow during hot-swap or partial-power-down sequences in modular systems. |
| Output Drive | ±24 mA at VCC = 3.0 V - Drives 50-Ω transmission lines or multiple LVC inputs without external buffers in point-to-point interconnects. |
| tsu/th (CLKEN) | 1.3 ns / 1.4 ns at VCC = 3.3 V - Tight setup/hold windows simplify clock-enable synchronization in multi-chip register chains. |
| θJA | 88 °C/W (TSSOP-PW) - Requires minimal heatsinking in ambient temperatures up to 85°C for continuous 8-bit data throughput. |
Pinout & Package
TSSOP-24 (PW) package: 7.8 mm × 4.4 mm body, 1.2 mm max height, 0.65 mm lead pitch, exposed pad not present, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8, 17–24 (A1–A8, B1–B8) | Bi-directional data I/O | Port A and Port B each carry 8-bit parallel data; direction controlled by clock and OE signals - no internal direction pin required. |
| 9 (OEAB) | A→B output enable | Active-low control: drives A-port data onto B bus when low; places B-port outputs in high-Z when high. |
| 10 (CLKAB) | A→B clock | Low-to-high edge captures A-port data into A→B register; sampling occurs only if CLKENAB is low. |
| 11 (CLKENAB) | A→B clock enable | Active-low gate: blocks CLKAB edge from latching unless asserted - enables synchronous gating of data flow. |
| 12 (GND) | Ground reference | Primary return path for all digital I/O and internal logic; must be low-inductance connection in high-speed layouts. |
| 13 (VCC) | Power supply | Single supply for core logic and I/O drivers; decoupling capacitor (0.1 µF) required within 5 mm of this pin. |
| 14 (OEBA) | B→A output enable | Active-low control: drives B-port data onto A bus when low; places A-port outputs in high-Z when high. |
| 15 (CLKBA) | B→A clock | Low-to-high edge captures B-port data into B→A register; sampling occurs only if CLKENBA is low. |
| 16 (CLKENBA) | B→A clock enable | Active-low gate: blocks CLKBA edge from latching unless asserted - enables independent flow control per direction. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clocked registers | Enables asynchronous, non-blocking bidirectional data transfer - A→B and B→A paths operate concurrently without arbitration logic. |
| Mixed-mode voltage translation | Eliminates need for discrete level shifters: 5-V inputs safely drive 3.3-V VCC logic, and 3.3-V outputs interface directly with 5-V-tolerant receivers. |
| Ioff partial-power-down support | Permits live insertion/removal in modular chassis: unpowered SN74LVC2952APW isolates both buses without injecting fault currents. |
| Guaranteed 3-state timing | ten ≤ 7.8 ns and tdis ≤ 7.8 ns at 3.3 V ensures glitch-free bus sharing in time-critical multiplexed architectures like PCIe sideband or JTAG daisy chains. |
| High noise immunity | VOLP < 0.8 V and VOHV > 2 V at 3.3 V suppress ground bounce and undershoot-induced false triggering in dense PCB layouts. |
Applications
| Industrial Backplane Interface | FPGA I/O Expansion |
|---|---|
Use Scenario: Connecting a 3.3-V microcontroller bus to legacy 5-V sensor modules in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-translating transceiver with registered data capture synchronized to controller clock edges. Use Value: Eliminates external level shifters and glue logic; registered transfer prevents metastability during asynchronous bus handshaking. | Use Scenario: Extending FPGA GPIO count via parallel 8-bit I/O expansion across a daughterboard interface. IC Role / Device Role / Timing Role: Registered bus repeater providing setup/hold margin for long trace runs between FPGA and peripheral ASICs. Use Value: On-chip registers absorb flight-time skew; 3-state outputs allow shared bus topology with multiple expansion devices. |
| Modular Test Equipment | Automated Test Fixture Control |
Use Scenario: Hot-swappable module interconnect in automated test systems where mainframe and modules power up at different times. IC Role / Device Role / Timing Role: Isolation buffer with Ioff-enabled power sequencing - prevents backfeeding during module insertion. Use Value: Enables true hot-swap capability without mechanical interlocks or complex power sequencing controllers. | Use Scenario: Controlling 8-channel relay banks and reading 8-bit status feedback from DUTs in production test fixtures. IC Role / Device Role / Timing Role: Synchronized I/O expander with separate clock enables for precise timing of actuation vs. sensing phases. Use Value: Dual clock-enable inputs allow independent gating of command and response paths, eliminating race conditions in closed-loop test sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC2952ADBR | SSOP-24 package (DB), θJA = 63 °C/W, 7.9 mm × 5.4 mm body, 0.635 mm pitch | Higher thermal performance and larger PCB footprint; preferred for high-reliability industrial environments with convection cooling. | Select SN74LVC2952ADBR when board space allows and thermal headroom is constrained; not pin-compatible due to different package dimensions and lead pitch. |
| SN74ALVC162952GR | 16-bit version in 48-pin TSSOP, 2.5-V-only operation (2.3–2.7 V), faster tpd = 5.2 ns at 2.5 V | Double data width and higher speed, but incompatible voltage range and pin count - requires full PCB redesign. | Choose SN74ALVC162952GR only for new 2.5-V systems requiring wider bus width; not a drop-in replacement for SN74LVC2952APW. |
Compared with SN74LVC2952ADBR and SN74ALVC162952GR, the SN74LVC2952APW uniquely balances compact TSSOP-24 packaging, 1.65–3.6-V flexibility, and 5.5-V input tolerance - making it the optimal choice for space-constrained, mixed-voltage embedded upgrades where thermal load is moderate and pin count must remain at 24.
Availability
SN74LVC2952APW is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA I/O expansion, modular test equipment, and automated test fixture control requiring stable component supply across extended product lifecycles.
Supply support for SN74LVC2952APW 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 over 50 years of innovation in high-reliability interface ICs.
The SN74LVC2952APW belongs to TI's LVC logic family - engineered for low-voltage, mixed-signal interoperability in industrial, communications, and computing systems where voltage translation and timing integrity are critical.
FAQ
What is the maximum clock frequency supported by the SN74LVC2952APW?
The SN74LVC2952APW supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 2.7 V ± 0.15 V or 3.3 V ± 0.3 V). This rating is derived from minimum pulse width requirements (tw ≥ 3.3 ns) and applies to both CLKAB and CLKBA inputs. The device achieves this performance while maintaining guaranteed setup/hold times and 3-state enable/disable timing, making it suitable for high-speed synchronous bus bridging in real-time control systems.
Does the SN74LVC2952APW require external pull-up resistors on OE pins?
Yes, to ensure high-impedance state during power-up or power-down, OEAB and OEBA should each be tied to VCC through a pull-up resistor. TI recommends calculating the minimum resistance based on the current-sinking capability of the driving source - typically 4.7 kΩ to 10 kΩ suffices for standard CMOS drivers. This prevents undefined bus states and potential contention before firmware initializes the control signals for the SN74LVC2952APW.
Can the SN74LVC2952APW interface directly with 5-V TTL outputs?
Yes, the SN74LVC2952APW accepts input voltages up to 5.5 V regardless of VCC level (1.65–3.6 V), making it fully compatible with standard 5-V TTL outputs. Its inputs are overvoltage-tolerant and do not require external clamping or level-shifting components. This capability is explicitly validated in the absolute maximum ratings and recommended operating conditions tables of the official datasheet for the SN74LVC2952APW.
What is the purpose of the CLKENAB and CLKENBA pins on the SN74LVC2952APW?
The CLKENAB and CLKENBA pins are active-low clock enable inputs that gate the respective clock edges (CLKAB and CLKBA). When high, they block data latching even if a clock edge occurs - enabling synchronous pausing of data flow without altering clock distribution. This function is essential for implementing flow control, burst gating, or handshake protocols in systems using the SN74LVC2952APW as a registered bus bridge between asynchronous domains.
Is the SN74LVC2952APW RoHS compliant and what is its moisture sensitivity level?
Yes, the SN74LVC2952APW is RoHS compliant with NIPDAU lead finish and carries a JEDEC MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH), confirmed in TI's official packaging addendum. This means the device can be stored indefinitely under standard lab conditions and withstand reflow soldering at peak temperatures up to 260°C without baking - simplifying manufacturing logistics for the SN74LVC2952APW in high-mix SMT lines.
SN74LVC2952APW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 24-TSSOP (0.173", 4.40mm 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-TSSOP
SN74LVC2952APW FAQ
1.How can I place an order for SN74LVC2952APW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC2952APW 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 SN74LVC2952APW reliable?
The price and inventory of SN74LVC2952APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC2952APW is usually 5 days.
3.What payment methods are accepted for SN74LVC2952APW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC2952APW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC2952APW?
SN74LVC2952APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC2952APW 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 SN74LVC2952APW?
For technical support, including SN74LVC2952APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC2952APW requirements.
6.How does Aetrix verify that SN74LVC2952APW is sourced from the original manufacturer or authorized distributors?
All SN74LVC2952APW 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 SN74LVC2952APW meets industry standards.
7.What is the process for return or replacement of SN74LVC2952APW?
All SN74LVC2952APW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC2952APW, 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 SN74LVC2952APW part is unused and in its original packaging.
Return procedure for SN74LVC2952APW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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