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Texas Instruments SN74LVT240ADB
- Part No.:
- SN74LVT240ADB
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVT240ADB.pdf
- Description:
- IC BUFFER INVERT 3.6V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:31,710
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Product details
Overview
SN74LVT240ADB from Fairchild Semiconductor is an inverting octal buffer/line driver with 3-STATE outputs, designed for memory address and clock driving in 3.3V systems interfacing to 5V TTL buses. It operates at VCC = 2.7–3.6V, delivers ±32mA/±64mA drive strength, and features live insertion/extraction support with power-up/down high-impedance behavior.
For engineers reviewing the SN74LVT240ADB datasheet, SN74LVT240ADB pinout, SN74LVT240ADB application, or SN74LVT240ADB equivalent, this page provides verified functional identity, SOIC-20 package mapping, confirmed DC/AC electrical specs (tPLH ≤ 3.8 ns, VOL ≤ 0.55V @ IOL = 64mA), bushold-free input architecture, and direct alternatives for bus interface upgrades.
Technical Context
The SN74LVT240ADB implements eight independent inverting buffers with dual 3-STATE enable inputs (OE1, OE2), each controlling four outputs. Its BiCMOS process enables ABT-class speed (tPHL ≤ 4.0 ns) while maintaining low static current (ICCZ = 0.19 mA).
It supports mixed-voltage operation: inputs tolerate 0–5.5V, outputs drive 5V TTL loads at 3.3V supply, and feature robust ESD protection (>2000V HBM). The absence of bushold distinguishes it from LVTH variants, requiring external pull-ups on unused inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7V to 3.6V - Valid operating supply for industrial temperature range (–40°C to +85°C) |
| IOL / IOH | 64mA / –32mA - Sinks 64mA at VOL ≤ 0.55V, sources 32mA at VOH ≥ 2.0V for TTL-compatible drive |
| tPLH / tPHL | ≤3.8ns / ≤4.0ns - Propagation delay into 50pF load ensures timing closure in high-speed address/data buses |
| Input Voltage Range | 0V to 5.5V - Enables direct connection to 5V logic without level shifters |
| Power-Up 3-STATE | Glitch-free - Outputs remain high-impedance during VCC ramp, preventing bus contention at power-on |
| ESD Rating | HBM > 2000V - Meets JEDEC JESD22-A114 reliability requirement for board handling |
Pinout & Package
SN74LVT240ADB is housed in a 20-pin SOIC package (JEDEC MS-013, 0.300" wide), pin-compatible with industry-standard 20-lead SOIC footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | I0, I4 | Inverting data inputs for first and second quad group |
| 2, 18 | I1, I5 | Inverting data inputs for first and second quad group |
| 3, 17 | I2, I6 | Inverting data inputs for first and second quad group |
| 4, 16 | I3, I7 | Inverting data inputs for first and second quad group |
| 5, 15 | O0, O4 | Inverted 3-STATE outputs controlled by OE1/OE2 |
| 6, 14 | O1, O5 | Inverted 3-STATE outputs controlled by OE1/OE2 |
| 7, 13 | O2, O6 | Inverted 3-STATE outputs controlled by OE1/OE2 |
| 8, 12 | O3, O7 | Inverted 3-STATE outputs controlled by OE1/OE2 |
| 9, 11 | OE1, OE2 | Active-Low 3-STATE enables - OE1 controls pins 5–8, OE2 controls pins 12–15 |
| 10 | GND | Ground reference for all internal circuitry and output drivers |
| 20 | VCC | 3.3V supply input - powers BiCMOS core and output stages |
Key Features
| Feature | Design Value |
|---|---|
| Inverting octal buffering with dual 3-STATE control | Enables selective isolation of two 4-bit data groups on shared buses without external gating logic |
| 5V-tolerant inputs and TTL-compatible outputs | Eliminates need for external level translators when interfacing 3.3V FPGAs/CPLDs to legacy 5V memory or peripheral buses |
| Live insertion/extraction support | Permits hot-swap replacement in backplane or modular systems without powering down adjacent slots |
| Low dynamic ground current (IGND ≤ ±128mA) | Reduces PCB ground bounce and improves signal integrity in dense multi-driver layouts |
| High noise immunity (VIH = 2.0V min, VIL = 0.8V max) | Ensures reliable switching across voltage droop and crosstalk in noisy industrial environments |
Applications
| Memory Address Buffering | Clock Distribution |
|---|---|
Use Scenario: Driving address lines from a 3.3V microcontroller to multiple 5V SRAM chips on a shared bus. IC Role / Device Role / Timing Role: Inverting buffer with 3-STATE control isolates address bus segments during memory bank switching. Use Value: Delivers 64mA sink current to meet 5V TTL VIH requirements while maintaining <4ns propagation delay for synchronous access timing. |
Use Scenario: Distributing a system clock from a 3.3V oscillator to multiple 5V logic devices with matched skew. IC Role / Device Role / Timing Role: Low-skew (<1.0ns) inverting line driver ensuring simultaneous clock edge arrival across receivers. Use Value: Output-to-output skew specification guarantees deterministic setup/hold margins for parallel clock fanout. |
| Bus Transceiver Interface | Industrial I/O Expansion |
Use Scenario: Bidirectional data bus isolation between a 3.3V FPGA and 5V peripheral controller using direction-controlled 3-STATE enables. IC Role / Device Role / Timing Role: Octal inverter with independent OE1/OE2 allows half-duplex bus arbitration without external direction logic. Use Value: Dual enable inputs simplify control logic and reduce FPGA pin count versus discrete gate solutions. |
Use Scenario: Expanding digital I/O on programmable logic controllers where field-side signals operate at 5V but controller core runs at 3.3V. IC Role / Device Role / Timing Role: Level-shifting buffer providing robust drive strength and ESD protection for industrial noise environments. Use Value: >2000V HBM ESD rating and –40°C to +85°C operation ensure reliability in factory automation deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVTH240DBR | Includes bushold inputs; eliminates need for external pull-ups on unused inputs | Better suited for systems with floating inputs or infrequent reconfiguration | Select when input termination overhead must be minimized and board space is constrained |
| 74ALVC240PW,118 | Lower drive (±24mA), smaller TSSOP-20 package, no live insertion support | Targeted at space-constrained portable designs with lower current demands | Choose for cost-sensitive consumer applications where 64mA drive and hot-swap are not required |
Compared with SN74LVT240ADB, SN74LVTH240DBR adds bushold for input stability but shares identical timing and drive specs; 74ALVC240PW,118 trades drive strength and ruggedness for footprint reduction and lower static power, making it suitable only in non-industrial contexts.
Availability
SN74LVT240ADB is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, and industrial I/O expansion requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SN74LVT240ADB 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
Fairchild Semiconductor was a leading analog and power IC manufacturer, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed in industrial and computing infrastructure.
The SN74LVT240ADB belongs to the LVT (Low-Voltage TTL) family, engineered for high-speed 3.3V bus interfacing with backward compatibility to 5V TTL systems in memory, clock, and data-path applications.
FAQ
What is the function of SN74LVT240ADB in a digital system?
The SN74LVT240ADB functions as an inverting octal buffer with dual 3-STATE outputs, primarily used to drive and isolate 5V TTL-compatible buses from 3.3V logic sources. It enables memory address routing, clock fanout, and bidirectional data bus control while maintaining signal integrity through controlled drive strength and low propagation delay.
Does SN74LVT240ADB support live insertion in backplane systems?
Yes, SN74LVT240ADB supports live insertion and extraction per its datasheet specification. Its power-up/down high-impedance behavior prevents bus contention during hot-swap events, making it suitable for modular industrial and telecom backplane architectures where cards are replaced without system shutdown.
What is the maximum output current capability of SN74LVT240ADB?
The SN74LVT240ADB delivers up to 64mA sink current (IOL) at VOL ≤ 0.55V and sources up to 32mA (IOH) at VOH ≥ 2.0V under recommended operating conditions (VCC = 3.3V, TA = –40°C to +85°C), enabling direct drive of multiple 5V TTL inputs without external amplification.
How does SN74LVT240ADB differ from SN74LVTH240DBR?
SN74LVT240ADB lacks bushold inputs, requiring external pull-up resistors on unused inputs, whereas SN74LVTH240DBR integrates bushold to maintain input state without external components. All other electrical and timing specifications-including drive strength, propagation delay, and package-are identical between the two parts.
Is SN74LVT240ADB compatible with 5V logic inputs and outputs?
SN74LVT240ADB accepts 0–5.5V input voltages and drives 5V TTL loads directly from a 3.3V supply, satisfying VIH ≥ 2.0V and VOL ≤ 0.55V requirements. This eliminates level-shifters in mixed-voltage systems, but its outputs are not 5V-supplied - they operate at VCC = 3.3V with TTL-compatible voltage thresholds.
SN74LVT240ADB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74LVT240ADB FAQ
1.How can I place an order for SN74LVT240ADB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT240ADB 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 SN74LVT240ADB reliable?
The price and inventory of SN74LVT240ADB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT240ADB is usually 5 days.
3.What payment methods are accepted for SN74LVT240ADB?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVT240ADB?
SN74LVT240ADB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVT240ADB 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 SN74LVT240ADB?
For technical support, including SN74LVT240ADB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT240ADB requirements.
6.How does Aetrix verify that SN74LVT240ADB is sourced from the original manufacturer or authorized distributors?
All SN74LVT240ADB 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 SN74LVT240ADB meets industry standards.
7.What is the process for return or replacement of SN74LVT240ADB?
All SN74LVT240ADB units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT240ADB, 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 SN74LVT240ADB part is unused and in its original packaging.
Return procedure for SN74LVT240ADB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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