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Texas Instruments SN74LVC240ADBR
- Part No.:
- SN74LVC240ADBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVC240ADBR.pdf
- Description:
- IC BUFFER INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,784
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Product details
Overview
SN74LVC240ADBR from Texas Instruments is an octal non-inverting 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 SN74LVC240ADBR datasheet, SN74LVC240ADBR pinout, SN74LVC240ADBR application, or SN74LVC240ADBR equivalent, key selection criteria include VCC range compatibility, 3-state bank control timing, Ioff-enabled live insertion support, overvoltage-tolerant input robustness, and TSSOP-20 thermal performance under industrial temperature conditions.
Technical Context
The SN74LVC240ADBR implements two independent 4-channel buffer banks, each controlled by a dedicated active-low output enable (OE1/OE2), allowing selective tri-state control of subsets of outputs without affecting the other bank. Its CMOS architecture provides balanced sourcing/sinking capability (±24mA at 3V) and supports bidirectional voltage translation via 5.5V-tolerant inputs while powered at 3.3V or lower.
It features Ioff circuitry that disables all outputs when VCC = 0V, preventing back-drive current during partial power-down, and includes Schmitt-trigger–free standard CMOS inputs requiring fast edge rates (≤6 ns/V) to avoid oscillation. The device meets JESD17 latch-up immunity (>100mA) and supports operation from –40°C to 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - Enables direct interface with 1.8V, 2.5V, and 3.3V logic domains without level shifters. |
| Input Voltage Tolerance | Up to 5.5V - Allows safe connection to 5V legacy signals while powered at 3.3V or lower. |
| tpd (max) | 6.5ns at VCC = 3.3V - Supports >100MHz signal redriving in short-trace digital interconnects. |
| Ioff Leakage | ±10μA max at 0V VCC - Ensures zero-current back-drive during hot-plug or partial power-down sequences. |
| Output Drive | ±24mA at VCC = 3V - Sustains clean logic levels into 50pF loads or moderate transmission-line impedances. |
| Operating Temp | –40°C to +125°C - Qualified for automotive under-hood, industrial motor control, and telecom infrastructure use. |
| ESD Rating | ±2000V HBM - Meets standard handling requirements for automated assembly and field service. |
Pinout & Package
TSSOP-20 (PW) package: 6.5mm × 6.4mm body with 0.65mm pitch, thermally enhanced for surface-mount reliability in high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low bank enable controls - Low enables Bank 1 (pins 2,3,4,5 → 18,17,16,15) or Bank 2 (pins 11,12,13,14 → 9,8,7,6). |
| 2,3,4,5,11,12,13,14 | A1–A4, Y1–Y4 (Bank 1/2 Inputs) | Non-inverting input channels - Accept 0–5.5V signals regardless of VCC; no external pull-ups required for 5V logic. |
| 18,17,16,15,9,8,7,6 | Y1–Y4, A1–A4 (Bank 1/2 Outputs) | 3-state CMOS outputs - High-impedance when corresponding OE is high; drive strength scales with VCC (e.g., 24mA @ 3V). |
| 10 | GND | Signal and power ground reference - Must be low-impedance; decoupling capacitor placed adjacent to Pin 20. |
| 20 | VCC | Core supply pin - Requires local 0.1μF ceramic bypass capacitor; supports mixed-voltage system partitioning. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal interface | 5.5V-tolerant inputs allow 5V microcontrollers to safely drive 3.3V buses without external level translators. |
| Dual independent 3-state banks | Separate OE1/OE2 pins enable time-multiplexed bus sharing or isolated subsystem control without contention. |
| Ioff partial-power-down protection | Zero-output leakage at 0V VCC prevents back-driving powered-down sections during hot-swap or sleep mode. |
| Low ground bounce (VOLP) | Typical <0.8V at VCC = 3.3V - Reduces noise coupling into shared ground planes in multi-device systems. |
| High-speed propagation | 6.5ns max tpd at 3.3V - Enables reliable redriving of DDR clock enables, address strobes, and peripheral select lines. |
Applications
| Industrial Bus Redriving | Digital Controller Reset Hold |
|---|---|
Use Scenario: Repeating TTL/CMOS signals across long PCB traces (>12 cm) between MCU and remote I/O modules. IC Role / Device Role / Timing Role: Signal integrity-preserving buffer with series-damping resistor support and 50pF load compliance. Use Value: Maintains monotonic edges and eliminates ringing via controlled drive strength and impedance matching guidance. | Use Scenario: Holding peripheral enable lines in high-impedance state during processor reset to prevent spurious activation. IC Role / Device Role / Timing Role: 3-state gate with independent bank control - one bank holds signals while the other remains active. Use Value: Eliminates need for discrete pull-up networks and guarantees glitch-free deassertion during boot sequence. |
| LED Indicator Driver | Transmission Line Interface |
Use Scenario: Driving multiple status LEDs from low-current GPIOs in embedded HMI panels. IC Role / Device Role / Timing Role: Current-boosting non-inverting buffer - sinks up to 24mA per channel at 3V. Use Value: Enables bright LED illumination without burdening MCU pins; supports common-anode configurations via open-drain emulation. | Use Scenario: Interfacing FPGA I/O banks to off-board memory or sensor modules via 50Ω PCB traces. IC Role / Device Role / Timing Role: Impedance-matched redriver with fast edge control and layout-aware damping recommendations. Use Value: Achieves clean eye diagrams at 50–100 Mbps without requiring dedicated SerDes PHYs or external terminations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244ADBR | Non-inverting octal buffer with identical VCC range, pinout, and timing but single OE control (not dual-bank). | Lacks independent bank enable - unsuitable for time-multiplexed bus arbitration or reset-isolation schemes. | Select when simplified global enable suffices and board space allows same footprint. |
| 74LVC8T245DP,118 | Octal dual-supply translator with direction control; supports 1.2V–3.6V on A-side and 1.2V–5.5V on B-side. | Provides bidirectional level shifting but no native 3-state bank separation; higher complexity and cost. | Choose only when crossing voltage domains (e.g., 1.8V ↔ 5V) is required alongside tri-state capability. |
Compared with SN74LVC240ADBR, SN74LVC244ADBR simplifies control at the expense of flexibility in segmented bus management, while 74LVC8T245DP,118 adds voltage translation overhead where pure redriving suffices - making SN74LVC240ADBR optimal for dual-domain isolation within a single supply rail.
Availability
SN74LVC240ADBR is available at Aetrix Electronics and suitable for industrial bus redriving, digital controller reset hold, LED indicator driving, and transmission line interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVC240ADBR 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 U.S.-based semiconductor company specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74LVC240ADBR belongs to TI's LVC logic family, engineered for low-voltage, high-speed, mixed-signal interfacing in space-constrained and thermally demanding environments.
FAQ
What is the maximum capacitive load the SN74LVC240ADBR can drive while maintaining full timing specifications?
The SN74LVC240ADBR is specified to drive loads ≤50pF while meeting all switching characteristics (tpd, ten, tdis) across –40°C to 125°C. Driving larger capacitances increases propagation delay and may cause signal degradation; layout best practices (short traces, ground plane, series damping) are recommended for >50pF loads. The SN74LVC240ADBR datasheet confirms this limit in Section 8.2.1.1.
Does the SN74LVC240ADBR support live insertion or hot-swap applications?
Yes, the SN74LVC240ADBR supports live insertion via its Ioff feature: when VCC = 0V, all outputs enter high-impedance with leakage ≤±10μA, preventing back-drive current into powered circuitry. This behavior is explicitly characterized in Section 5.5 (Ioff parameter) and Section 7.3.2 of the SN74LVC240ADBR datasheet.
Can the SN74LVC240ADBR interface a 5V microcontroller output directly to a 3.3V FPGA input?
Yes - the SN74LVC240ADBR accepts input voltages up to 5.5V independent of VCC, so a 5V MCU output can safely drive its A-inputs while VCC = 3.3V. The resulting Y-outputs swing 0–3.3V, compatible with 3.3V FPGA I/O. This mixed-mode operation is documented in Feature #6 and Section 7.3.1 of the SN74LVC240ADBR datasheet.
What is the recommended bypass capacitor configuration for the SN74LVC240ADBR in a TSSOP-20 layout?
Texas Instruments recommends a 0.1μF ceramic capacitor placed adjacent to Pin 20 (VCC) with a low-inductance path to Pin 10 (GND), as shown in Figure 8-4 of the SN74LVC240ADBR datasheet. For broadband noise suppression, add a parallel 1μF capacitor nearby. Trace width should be ≥8 mil, and ground return must be electrically short.
How does the dual-output-enable architecture of the SN74LVC240ADBR improve system-level bus management?
The SN74LVC240ADBR's separate OE1 and OE2 pins allow independent control of two 4-channel banks - enabling time-multiplexed bus sharing, isolated reset sequencing, or fault-containment zones. Unlike single-OE buffers, this prevents unintended signal contention during state transitions and is validated in Table 7-1 (Function Table) and Section 7.1 of the SN74LVC240ADBR datasheet.
SN74LVC240ADBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 20-SSOP (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:
- 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-SSOP
SN74LVC240ADBR FAQ
1.How can I place an order for SN74LVC240ADBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC240ADBR 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 SN74LVC240ADBR reliable?
The price and inventory of SN74LVC240ADBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC240ADBR is usually 5 days.
3.What payment methods are accepted for SN74LVC240ADBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC240ADBR transactions.
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4.How is shipping managed for SN74LVC240ADBR?
SN74LVC240ADBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC240ADBR 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 SN74LVC240ADBR?
For technical support, including SN74LVC240ADBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC240ADBR requirements.
6.How does Aetrix verify that SN74LVC240ADBR is sourced from the original manufacturer or authorized distributors?
All SN74LVC240ADBR 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 SN74LVC240ADBR meets industry standards.
7.What is the process for return or replacement of SN74LVC240ADBR?
All SN74LVC240ADBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC240ADBR, 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 SN74LVC240ADBR part is unused and in its original packaging.
Return procedure for SN74LVC240ADBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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