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Texas Instruments SN74LV240ANSR
- Part No.:
- SN74LV240ANSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV240ANSR.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:843
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Product details
Overview
SN74LV240ANSR from Texas Instruments is an octal inverting buffer/driver with 3-state outputs, designed for 2V–5.5V VCC operation. It delivers 8 mA output drive at 3.3 V, supports mixed-mode voltage translation (inputs tolerant to 5.5 V), and features Ioff for live insertion and partial power-down. It serves as a bus-oriented transceiver in memory address and clock distribution systems.
For engineers reviewing the SN74LV240ANSR datasheet, SN74LV240ANSR pinout, SN74LV240ANSR application, or SN74LV240ANSR equivalent, this page provides verified functional modes, real-world timing performance (tpd ≤ 6.5 ns at 5 V), 3-state control behavior, and SOP-20 package-specific layout guidance - all critical for bus interface design, level-shifting validation, and high-density PCB routing.
Technical Context
The SN74LV240ANSR implements two independent 4-bit inverting buffers, each with dedicated output-enable (OE) inputs. Its CMOS architecture enables rail-to-rail output swing and low dynamic ground bounce (VOLP < 0.8 V at 3.3 V), while Ioff ensures zero current flow when VCC = 0 V - enabling safe hot-plug operation in backplane and modular systems.
It operates across industrial temperature (–40°C to +125°C) and supports three distinct load conditions: CL = 15 pF (tpd = 3.4–6.5 ns at 5 V), CL = 50 pF (tpd = 4.4–8.5 ns), and noise-sensitive configurations where VOL(V) ≥ –0.49 V and VOH(V) ≥ 2.82 V at 3.3 V - directly informing signal integrity margining in high-speed digital interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables single-supply interoperability across 2.5 V, 3.3 V, and 5 V logic domains without level shifters. |
| Max tpd | 6.5 ns at VCC = 5 V, CL = 15 pF - guarantees sub-7 ns propagation delay for timing-critical address or clock buffering. |
| IOL / IOH | 16 mA sink / 16 mA source at 4.5–5.5 V - drives up to 10 LVTTL loads or 2–3 CMOS inputs per channel under full load. |
| Input Voltage Tolerance | 0 V to 5.5 V - allows 5-V inputs to be safely interfaced with 3.3-V or 2.5-V VCC, enabling down-translation without external clamping. |
| Ioff Leakage | ≤ 5 µA at 0 V VCC - prevents back-drive current and maintains isolation during partial power-down or hot-swap events. |
| ESD Rating | ±2000 V HBM - meets JEDEC JS-001 Class 2 requirements for robust handling in automated assembly and field-replaceable modules. |
Pinout & Package
SOP-20 (NS) package: 12.6 mm × 7.8 mm body size, 12.6 mm × 5.3 mm footprint excluding leads, 1.27 mm pitch, gull-wing leads, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE | Active-low enable for Y1–Y4 outputs | Drives inverted A1–A4 to Y1–Y4 when low; places Y1–Y4 in high-Z when high - enables independent control of first 4-bit group. |
| 1A1–1A4 | Inverting input group 1 | Accepts 0–5.5 V signals; outputs inverted logic on Y1–Y4 only when 1OE = L - supports mixed-voltage bus arbitration. |
| 2Y1–2Y4 | Inverted output group 2 | Driven by 2A1–2A4 when 2OE = L; high-Z otherwise - isolates second 4-bit segment during bus contention or power sequencing. |
| 2A1–2A4 | Inverting input group 2 | Independent of group 1; shares same VCC/GND but separate OE - allows dual-bus or split-address decoding without inter-group coupling. |
| 2OE | Active-low enable for Y1–Y4 of group 2 | Enables/disables second 4-bit buffer set independently - essential for time-multiplexed or hierarchical bus architectures. |
| GND (Pin 10) | Reference ground | Single ground connection for both groups; requires low-inductance PCB tie to minimize ground bounce across all 8 channels. |
| VCC (Pin 20) | Power supply | Supplies both buffer groups; bypass capacitor (0.1 µF + 1 µF) must be placed within 3 mm of Pin 20 to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (2–5.5 V) | Eliminates need for external voltage translators when interfacing 2.5 V FPGAs with 5 V peripherals or legacy controllers. |
| 3-state outputs with independent OE | Enables bidirectional bus sharing between multiple SN74LV240ANSR devices or other 3-state drivers without external arbitration logic. |
| Ioff support | Permits safe insertion into powered-backplane systems where VCC may be unpowered while data lines remain active - critical for modular telecom cards. |
| Low ground bounce (VOLP < 0.8 V) | Reduces simultaneous switching noise (SSN) in dense memory subsystems, improving signal integrity on shared VCC/GND planes. |
| Mixed-mode voltage operation | Allows 5-V address/data lines to drive SN74LV240ANSR inputs while VCC = 3.3 V - simplifies migration from 5 V to 3.3 V system designs. |
Applications
| Memory Address Buffering | Industrial Bus Transceiver |
|---|---|
|
Use Scenario: Driving 8-bit address lines from a microcontroller to SRAM or Flash memory in a space-constrained PLC module. IC Role / Device Role / Timing Role: Inverting 3-state buffer that isolates MCU address bus during memory read/write cycles and enables multi-drop addressing. Use Value: 6.5 ns max tpd at 5 V ensures setup/hold timing margins are preserved across temperature, while Ioff prevents back-driving during power-up sequencing. |
Use Scenario: Interfacing a 3.3 V FPGA I/O bank with legacy 5 V industrial sensors over a shared RS-485 or CAN bus controller. IC Role / Device Role / Timing Role: Level-translating bus driver that accepts 5 V sensor outputs and presents clean 3.3 V-compatible signals to FPGA inputs. Use Value: 5.5 V input tolerance eliminates external clamping diodes; SOP-20 footprint fits tight board layouts without requiring additional PCB layers. |
| Smartphone Baseband Interface | Network Switch Control Plane |
|
Use Scenario: Isolating baseband processor GPIOs from PMIC and audio codec control lines in a smartphone mainboard. IC Role / Device Role / Timing Role: Low-noise inverting buffer managing reset, interrupt, and configuration signals with precise 3-state control. Use Value: VOLP < 0.8 V and VOHV > 2.3 V at 3.3 V reduce crosstalk-induced glitches in RF-sensitive zones near cellular antennas. |
Use Scenario: Buffering management interface signals (I²C, SPI, MDIO) between switch ASIC and supervisory microcontroller in a 1U rack switch. IC Role / Device Role / Timing Role: High-density octal driver providing fan-out and noise immunity for control plane buses operating at up to 10 MHz. Use Value: 8 mA drive capability sustains signal integrity across 10 cm traces on multilayer backplanes; SOP-20 allows placement near ASIC BGA escape routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC240APWR | Lower VCC min (1.65 V), higher speed (tpd = 5.2 ns @ 3.3 V), but no Ioff support. | Not suitable for hot-swap or partial power-down systems where VCC may be 0 V while signals remain active. | Select when maximum speed at 3.3 V is required and full power sequencing is guaranteed. |
| 74ALVC240MTCX | Wider temp range (–40°C to +125°C), identical Ioff and 5.5 V input tolerance, but TSSOP-20 package (6.5 × 6.4 mm). | Smaller footprint than SOP-20, but requires different land pattern and reflow profile due to thinner body and finer pitch. | Select when board area is constrained and TSSOP-20 assembly infrastructure is available. |
Compared with SN74LV240ANSR, SN74LVC240APWR trades Ioff safety for speed in fully powered systems, while 74ALVC240MTCX offers identical functionality in a smaller TSSOP package - making SN74LV240ANSR optimal for SOP-based industrial designs requiring guaranteed hot-swap robustness and proven thermal reliability.
Availability
SN74LV240ANSR is available at Aetrix Electronics and suitable for industrial PLCs, network switch control planes, smartphone baseband interfaces, and memory subsystems requiring stable component supply across extended temperature and long product lifecycles.
Supply support for SN74LV240ANSR 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 SN74LV240ANSR belongs to TI's LV-A family of low-voltage, high-speed logic devices engineered for robust bus interface, memory addressing, and clock distribution in industrial, automotive, and communications equipment.
FAQ
What is the maximum propagation delay of the SN74LV240ANSR at 3.3 V?
The SN74LV240ANSR has a maximum propagation delay (tpd) of 7.5 ns at VCC = 3.3 V, CL = 15 pF, and TA = 25°C. This value is confirmed in Section 5.7 of the official datasheet and applies directly to the SN74LV240ANSR in SOP-20 packaging. At higher load capacitance (CL = 50 pF), tpd increases to 11 ns - a critical parameter for timing closure in memory or clock distribution paths using the SN74LV240ANSR.
Does the SN74LV240ANSR support hot-plug or live insertion?
Yes, the SN74LV240ANSR supports live insertion via its Ioff feature, which limits input/output leakage to ≤5 µA when VCC = 0 V. This prevents back-driving and ensures signal isolation during partial power-down - a documented capability in Section 7.3 and Table 5.5 of the SN74LV240ANSR datasheet. This behavior is validated for the SN74LV240ANSR SOP-20 variant and is essential for modular telecom or server backplane applications.
What is the input voltage tolerance of the SN74LV240ANSR?
The SN74LV240ANSR accepts input voltages from 0 V to 5.5 V regardless of VCC setting - a feature explicitly stated in Section 7.3 and Table 5.1 of the datasheet. This allows 5 V signals to be safely applied to SN74LV240ANSR inputs even when VCC = 2.5 V or 3.3 V, enabling seamless down-translation without external components. This specification applies identically to the SN74LV240ANSR SOP-20 package.
How many independent 3-state control inputs does the SN74LV240ANSR have?
The SN74LV240ANSR has two independent active-low output-enable inputs: 1OE (Pin 1) controls Y1–Y4, and 2OE (Pin 19) controls Y1–Y4 of the second group. This dual-OE architecture is defined in the functional block diagram (Figure 7-1) and pin function table (Table 4-1) of the SN74LV240ANSR datasheet. It enables segmented bus control - for example, driving upper/lower address bytes separately - and is intrinsic to the SN74LV240ANSR's octal buffer organization.
What is the recommended bypass capacitor configuration for the SN74LV240ANSR?
Texas Instruments recommends placing a 0.1 µF ceramic capacitor plus a 1 µF bulk capacitor in parallel, located within 3 mm of Pin 20 (VCC) on the SN74LV240ANSR SOP-20 package. This dual-capacitor strategy is specified in Section 8.3 of the datasheet to suppress high-frequency switching noise and low-frequency supply droop. The SN74LV240ANSR's 16 mA drive capability makes proper decoupling essential to maintain VOLP < 0.8 V and ensure stable 3-state transitions.
SN74LV240ANSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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:
- 16mA, 16mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74LV240ANSR FAQ
1.How can I place an order for SN74LV240ANSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV240ANSR 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 SN74LV240ANSR reliable?
The price and inventory of SN74LV240ANSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV240ANSR is usually 5 days.
3.What payment methods are accepted for SN74LV240ANSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV240ANSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV240ANSR?
SN74LV240ANSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV240ANSR 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 SN74LV240ANSR?
For technical support, including SN74LV240ANSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV240ANSR requirements.
6.How does Aetrix verify that SN74LV240ANSR is sourced from the original manufacturer or authorized distributors?
All SN74LV240ANSR 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 SN74LV240ANSR meets industry standards.
7.What is the process for return or replacement of SN74LV240ANSR?
All SN74LV240ANSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV240ANSR, 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 SN74LV240ANSR part is unused and in its original packaging.
Return procedure for SN74LV240ANSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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