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Texas Instruments SN74LVC240APWR
- Part No.:
- SN74LVC240APWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC240APWR.pdf
- Description:
- IC BUFFER INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,598
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Product details
Overview
SN74LVC240APWR from Texas Instruments is an octal noninverting buffer/driver with dual 3-state output banks, operating from 1.65V to 3.6V supply, supporting 5.5V-tolerant inputs, delivering ≤6.5ns propagation delay at 3.3V, and enabling mixed-mode signal interfacing (e.g., 5V logic driving 3.3V bus). It is used in digital signal redriving, transmission line termination, and controller reset hold applications.
For engineers reviewing the SN74LVC240APWR datasheet, SN74LVC240APWR pinout, SN74LVC240APWR application, or SN74LVC240APWR equivalent, key selection criteria include VCC range compatibility, 3-state bank control timing, Ioff-enabled live insertion support, output drive strength (±24mA at 3V), and TSSOP-20 thermal performance (RθJA = 120.3°C/W).
Technical Context
The SN74LVC240APWR implements two independent 4-channel buffer banks, each controlled by a dedicated active-low output enable (OE1/OE2), allowing selective tri-state control of outputs without affecting the other bank. Its CMOS input structure accepts voltages up to 5.5V regardless of VCC, enabling direct interfacing between 5V and 3.3V domains.
It features Ioff circuitry that disables all outputs when VCC = 0V, preventing back-drive current and supporting partial power-down operation. Output ground bounce (VOLP < 0.8V) and VOH undershoot (VOHV > 2V) are characterized at 3.3V/25°C, confirming robust signal integrity during switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V–3.6V: Enables use in low-voltage embedded systems while maintaining compatibility with legacy 3.3V infrastructure. |
| Input Voltage Tolerance | Up to 5.5V: Allows safe connection to 5V logic sources without level shifters in mixed-voltage systems. |
| tpd (Max) | 6.5ns at VCC = 3.3V: Supports ≥150MHz signal redriving in high-speed digital buses with tight timing budgets. |
| Ioff Leakage | ±10μA max at VCC = 0V: Ensures zero-current back-drive during hot-swap or partial power-down sequences. |
| Output Drive | ±24mA at VCC = 3V: Sustains reliable logic-level signaling into 50pF loads or moderate transmission-line impedances. |
| ESD Rating | ±2000V HBM: Meets industrial-grade handling requirements without additional protection circuitry. |
| Operating Temp | –40°C to +125°C: Validated for automotive under-hood and industrial control environments. |
Pinout & Package
Packaged in a 20-pin TSSOP (PW), the SN74LVC240APWR measures 6.5mm × 6.4mm (including pins) with a 6.5mm × 4.4mm body footprint, optimized for space-constrained PCB layouts while maintaining manufacturability and thermal dissipation (RθJA = 120.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 19OE | Active-low bank enable inputs | Independently disable Bank 1 (pins 2,3,4,5 → 18,17,16,15) or Bank 2 (pins 11,12,13,14 → 9,8,7,6); both must be low for full output activation. |
| 1A1–1A4, 2A1–2A4 | Input channels (8 total) | Noninverting inputs mapped per bank: Bank 1 inputs on pins 2,3,4,5; Bank 2 inputs on pins 11,12,13,14. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs (8 total) | Outputs mirror respective inputs when enabled; enter high-Z state when OE is high - critical for bus arbitration and signal isolation. |
| VCC (Pin 20) | Positive supply | Single 1.65–3.6V rail powers entire device; bypassing with 0.1μF capacitor near pin required for stable switching. |
| GND (Pin 10) | Ground reference | Common return path for all I/O and supply currents; must connect to low-impedance system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | 5.5V-tolerant inputs allow direct connection to 5V controllers while powered from 3.3V, eliminating external level translators. |
| Live-insertion support | Ioff functionality blocks current flow when VCC = 0V, enabling safe board replacement in powered-backplane systems. |
| Bank-selectable 3-state control | Dual OE pins permit independent bus segment isolation - e.g., hold peripheral data lines while reconfiguring host interface. |
| Low ground bounce | VOLP < 0.8V at 3.3V ensures minimal noise coupling into shared ground paths during simultaneous output transitions. |
| High-speed propagation | 6.5ns tpd at 3.3V enables clean redriving of DDR clock enables, address strobes, or FPGA configuration signals. |
Applications
| LED Indicator Driving | Digital Signal Redriving |
|---|---|
Use Scenario: Driving multiple discrete LEDs from a low-drive MCU GPIO port. IC Role / Device Role / Timing Role: Noninverting buffer providing current gain and voltage-level translation between MCU and LED anodes/cathodes. Use Value: Delivers ±24mA per channel at 3V to directly illuminate standard 20mA LEDs without external transistors or resistors beyond current-limiting. | Use Scenario: Restoring signal integrity on long PCB traces (>12 cm) between microcontroller and peripheral ICs. IC Role / Device Role / Timing Role: Redriver inserting clean, low-skew copies of control/data signals with matched rise/fall times. Use Value: 6.5ns tpd and balanced CMOS outputs minimize jitter accumulation and maintain setup/hold margins across multi-drop buses. |
| Transmission Line Termination | Controller Reset Hold |
Use Scenario: Driving impedance-matched 50Ω transmission lines in industrial communication modules. IC Role / Device Role / Timing Role: Source-end driver with series-damping resistor support to suppress reflections and ringing. Use Value: ±24mA drive capability sustains logic levels into 50Ω loads; fast edges (<6.5ns) require careful layout but enable >100MHz edge rates. | Use Scenario: Holding a processor's reset line in asserted state during power stabilization or firmware update. IC Role / Device Role / Timing Role: 3-state buffer isolating reset signal source until system clocks and supplies stabilize. Use Value: Dual OE control allows precise timing of reset deassertion; Ioff prevents leakage-induced premature release during VCC ramp-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Noninverting octal buffer with identical VCC range, pinout, and timing, but single OE control for all 8 channels. | Lacks independent bank control; unsuitable where selective bus segmentation is required. | Choose SN74LVC244APWR only if unified enable suffices and board layout rework is acceptable. |
| 74LVC8T245PW | Bidirectional 8-bit translator with auto-direction sensing; supports 1.65–3.6V dual-supply operation and 5.5V-tolerant I/O. | Provides level shifting between different VCC domains (e.g., 1.8V ↔ 3.3V); adds direction control complexity. | Select 74LVC8T245PW when bidirectional data flow or asymmetric voltage translation is needed - not a drop-in replacement. |
Compared with SN74LVC244APWR, the SN74LVC240APWR offers finer-grained bus control via dual OE pins; compared with 74LVC8T245PW, it provides simpler unidirectional buffering without direction logic overhead or dual-rail dependency.
Availability
SN74LVC240APWR is available at Aetrix Electronics and suitable for industrial automation interfaces, automotive body control modules, and embedded computing platforms requiring stable component supply, extended temperature operation, and mixed-voltage interoperability.
Supply support for SN74LVC240APWR 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 innovation in high-reliability logic families.
The SN74LVC240APWR belongs to TI's LVC (Low-Voltage CMOS) logic family, designed specifically for low-power, high-speed interfacing in battery-powered and thermally constrained systems operating across 1.65–3.6V rails.
FAQ
What is the maximum input voltage the SN74LVC240APWR can tolerate?
The SN74LVC240APWR accepts input voltages up to 5.5V regardless of VCC level, enabling direct interfacing with 5V logic sources while powered from 3.3V or lower. This tolerance is specified in the Absolute Maximum Ratings table and verified across –40°C to +125°C, making SN74LVC240APWR suitable for mixed-voltage system integration without external level-shifting components.
Does the SN74LVC240APWR support hot-plug or live insertion?
Yes, the SN74LVC240APWR supports live insertion via its Ioff feature: when VCC = 0V, all outputs are disabled and leakage current is limited to ±10μA maximum, preventing back-drive current into powered circuitry. This behavior is explicitly characterized in the Electrical Characteristics table and enables safe board replacement in partially powered systems - a key requirement for SN74LVC240APWR in modular industrial hardware.
How many output enable pins does the SN74LVC240APWR have, and how are they configured?
The SN74LVC240APWR has two active-low output enable pins: 1OE (Pin 1) controls Bank 1 outputs (1Y1–1Y4), and 2OE (Pin 19) controls Bank 2 outputs (2Y1–2Y4). Each bank contains four noninverting buffers, allowing independent tri-state control of two 4-bit segments - a defining functional distinction of SN74LVC240APWR versus single-OE alternatives like SN74LVC244APWR.
What is the typical propagation delay of the SN74LVC240APWR at 3.3V?
The maximum propagation delay (tpd) of the SN74LVC240APWR is 6.5ns at VCC = 3.3V, TA = –40°C to +85°C, as specified in the Switching Characteristics table. This value represents worst-case delay across temperature and voltage; typical performance is faster, supporting reliable operation in high-speed digital timing paths such as memory address latching or FPGA I/O expansion where SN74LVC240APWR serves as a precision redriver.
Can the SN74LVC240APWR drive a 50pF capacitive load while meeting datasheet specifications?
Yes, the SN74LVC240APWR is fully specified to drive loads ≤50pF while maintaining all timing, voltage, and current parameters within datasheet limits - including tpd ≤6.5ns and VOL ≤0.55V at 24mA sink. The Application and Implementation section explicitly states this 50pF limit for guaranteed compliance; exceeding it may degrade switching performance or increase ground bounce, so SN74LVC240APWR designs must account for trace and receiver capacitance in total load calculation.
SN74LVC240APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LVC240APWR FAQ
1.How can I place an order for SN74LVC240APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC240APWR 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 SN74LVC240APWR reliable?
The price and inventory of SN74LVC240APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC240APWR is usually 5 days.
3.What payment methods are accepted for SN74LVC240APWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC240APWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC240APWR?
SN74LVC240APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC240APWR 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 SN74LVC240APWR?
For technical support, including SN74LVC240APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC240APWR requirements.
6.How does Aetrix verify that SN74LVC240APWR is sourced from the original manufacturer or authorized distributors?
All SN74LVC240APWR 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 SN74LVC240APWR meets industry standards.
7.What is the process for return or replacement of SN74LVC240APWR?
All SN74LVC240APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC240APWR, 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 SN74LVC240APWR part is unused and in its original packaging.
Return procedure for SN74LVC240APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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