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Texas Instruments SN74ABT240APWLE
- Part No.:
- SN74ABT240APWLE
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ABT240APWLE.pdf
- Description:
- BUS DRIVER, ABT SERIES, 4-BIT
- Quantity:
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Inventory:1,968
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Product details
Overview
SN74ABT240APWLE from Texas Instruments is an octal inverting buffer/driver with 3-state outputs, designed for memory address and bus interface applications. It features high-drive capability (–32 mA IOH, 64 mA IOL), Ioff partial-power-down support, ground-bounce suppression (<1 V VOLP), and operates over –40°C to 85°C at 4.5–5.5 V supply. It is used in industrial control backplanes and legacy parallel bus systems.
For engineers reviewing the SN74ABT240APWLE datasheet, SN74ABT240APWLE pinout, SN74ABT240APWLE application, or SN74ABT240APWLE equivalent, key selection criteria include guaranteed 3-state isolation under power-down, TTL-compatible input thresholds, symmetric active-low OE control per 4-bit section, and TSSOP-20 packaging for high-density PCB layouts.
Technical Context
The SN74ABT240APWLE implements two independent 4-bit inverting buffers, each with dedicated active-low output-enable (OE) inputs. Data flow is strictly inverted: low OE enables Y = NOT(A), while high OE forces all eight outputs into high-impedance state. The device uses ABT (Advanced BiCMOS Technology) logic, combining bipolar speed with CMOS power efficiency.
Its Ioff circuitry actively disables outputs when VCC = 0 V, blocking reverse current up to ±100 µA - critical for hot-swap and multi-rail systems. Absolute maximum ratings include 7 V supply tolerance and –0.5 V to 5.5 V output voltage range in high-Z or powered-off states, supporting robust system-level interoperability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and mixed-voltage bus systems. |
| Output Drive | –32 mA IOH / 64 mA IOL - drives heavy capacitive loads (e.g., >100 pF) without signal degradation. |
| Ioff Current | ±100 µA at VCC = 0 - prevents backflow damage during partial power-down or board insertion. |
| Propagation Delay | tPLH/tPHL ≤ 4.8 ns @ 5 V, CL = 50 pF - supports >100 MHz bus toggle rates in synchronous designs. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - matches standard TTL logic levels for seamless interfacing with legacy controllers. |
| ESD Rating | 2000-V HBM, 200-V MM - exceeds JEDEC JESD22-A114/A115, enabling handling in non-EPA environments. |
| Thermal Resistance | θJA = 83°C/W (PW package) - defines maximum power dissipation (≤350 mW) under natural convection. |
Pinout & Package
TSSOP-20 (PW) package: 6.95 mm × 4.4 mm × 1.2 mm body, 0.65 mm lead pitch, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control of first/second 4-bit sections; must be pulled high via resistor during power-up to ensure safe high-Z state. |
| 1A1–1A4, 2A1–2A4 | Buffer inputs | Inverting inputs; accept TTL/CMOS logic; unused inputs must be tied to VCC or GND per SCBA004. |
| 1Y1–1Y4, 2Y1–2Y4 | Inverting buffered outputs | 3-state outputs with high-drive strength; sink/source current specified per JEDEC test conditions. |
| VCC (Pin 10) | Power supply | Single 5-V rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin. |
| GND (Pin 20) | Ground reference | Common return for all signals and power; low-inductance connection essential for ground-bounce mitigation. |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | Delivers –32 mA source / 64 mA sink per output - eliminates need for external bus transceivers in medium-load applications. |
| Ioff Partial-Power-Down | Blocks reverse current when VCC = 0 - enables safe insertion into live backplanes without disrupting other powered rails. |
| Low Ground Bounce | VOLP < 1 V @ 5 V, 25°C - maintains signal integrity on shared ground planes during simultaneous switching. |
| Latch-Up Immunity | Exceeds 500 mA per JESD17 - ensures reliability in noisy industrial environments with transient coupling. |
| JEDEC-Compliant ESD | 2000-V HBM / 200-V MM - reduces field failure risk during assembly and handling without additional protection circuits. |
Applications
| Industrial Backplane Interface | Legacy Parallel Bus Driver |
|---|---|
Use Scenario: Driving address/data lines across a 200-mm PCB backplane with 80 pF trace capacitance and multiple slot connectors. IC Role / Device Role / Timing Role: Inverting buffer providing level translation and fanout expansion between microcontroller and peripheral cards. Use Value: Guaranteed 4.8 ns max propagation delay and 64 mA drive maintain setup/hold timing margins at 25 MHz bus clock. |
Use Scenario: Interfacing an ISA-bus-compatible FPGA controller to legacy parallel EEPROM and latch peripherals. IC Role / Device Role / Timing Role: Octal 3-state driver enabling bidirectional data routing with hardware-selectable channel isolation. Use Value: Independent OE pins allow dynamic partitioning of A/B banks, reducing contention during multi-cycle read/write sequences. |
| Memory Address Buffering | Hot-Swappable Module Interface |
Use Scenario: Buffering 8-bit address lines from a microprocessor to dual-port SRAM with 10 ns access time. IC Role / Device Role / Timing Role: Inverting address driver ensuring monotonic edge transitions and minimizing skew across bit lanes. Use Value: Matched tPLH/tPHL (≤0.7 ns skew) and low VOLP prevent address decoding glitches during high-speed burst reads. |
Use Scenario: Enabling safe insertion/removal of I/O modules in a programmable logic controller rack with live 5-V backplane. IC Role / Device Role / Timing Role: Isolation buffer enforcing power sequencing compliance via Ioff and controlled OE assertion. Use Value: ±100 µA Ioff limits inrush current during plug-in, avoiding brownout on shared VCC and preventing latch-up in adjacent ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT240ADBR | SSOP-20 (DB) package; θJA = 70°C/W; identical electrical specs and pinout. | Slightly larger footprint (7.5 mm × 5.0 mm vs. 6.95 mm × 4.4 mm); higher thermal performance margin. | Select when board layout allows larger package and improved thermal headroom is prioritized over space-constrained routing. |
| SN74ABT240ADWR | SOIC-20 (DW) package; θJA = 58°C/W; same logic function and timing, but wider body (12.8 mm × 7.5 mm). | Lower thermal resistance supports higher sustained current; incompatible pin pitch (1.27 mm vs. 0.65 mm) requires PCB redesign. | Choose for prototyping or low-volume production where SOIC hand-soldering and thermal robustness outweigh density requirements. |
Compared with SN74ABT240ADBR and SN74ABT240ADWR, the SN74ABT240APWLE offers the smallest PCB footprint and highest component density, while maintaining identical logic behavior and drive strength - making it optimal for space-constrained industrial modules where thermal load remains within 350 mW.
Availability
SN74ABT240APWLE is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy parallel bus systems, memory address buffering, and hot-swappable module interfaces requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74ABT240APWLE 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 90 years of innovation in industrial, automotive, and communications markets.
The ABT logic family, including SN74ABT240APWLE, was engineered for high-speed, high-drive 5-V bus interface applications - delivering superior noise immunity, ground-bounce control, and power-down safety in mission-critical systems.
FAQ
What is the operating temperature range for SN74ABT240APWLE?
The SN74ABT240APWLE is rated for industrial operation from –40°C to +85°C. This range is validated per TI's production testing and aligns with its SOIC, SSOP, and TSSOP variants. Operation outside this range may result in undefined timing, increased leakage, or permanent damage.
Does SN74ABT240APWLE support hot-swap functionality?
Yes - the SN74ABT240APWLE supports hot-swap via its Ioff feature, which disables outputs and limits reverse current to ±100 µA when VCC = 0 V. This prevents backfeeding into powered subsystems during live insertion, satisfying key requirements for modular industrial chassis designs.
What is the recommended pull-up resistor value for OE pins on SN74ABT240APWLE?
Texas Instruments recommends tying OE pins to VCC through a pull-up resistor to ensure high-impedance state during power-up. Minimum value is determined by the driving source's current-sinking capability; typical values range from 4.7 kΩ to 10 kΩ for standard logic drivers, per SCBA004 guidelines.
Can SN74ABT240APWLE drive a 100-pF load at 25 MHz?
Yes - the SN74ABT240APWLE delivers 64 mA sink current and exhibits ≤4.8 ns propagation delay into 50 pF. At 100 pF, rise/fall times increase moderately but remain compatible with 25 MHz (40 ns period) timing budgets, assuming proper termination and layout practices.
Is SN74ABT240APWLE pin-compatible with SN74ABT240ADBR?
No - although both are functionally identical octal inverting buffers, SN74ABT240APWLE uses TSSOP-20 (0.65 mm pitch), while SN74ABT240ADBR uses SSOP-20 (0.65 mm pitch but different land pattern and body dimensions). They share pin numbering but require separate PCB footprints due to differing package outlines and solder mask requirements.
SN74ABT240APWLE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74ABT240APWLE FAQ
1.How can I place an order for SN74ABT240APWLE through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT240APWLE 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 SN74ABT240APWLE reliable?
The price and inventory of SN74ABT240APWLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT240APWLE is usually 5 days.
3.What payment methods are accepted for SN74ABT240APWLE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT240APWLE transactions.
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4.How is shipping managed for SN74ABT240APWLE?
SN74ABT240APWLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT240APWLE 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 SN74ABT240APWLE?
For technical support, including SN74ABT240APWLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT240APWLE requirements.
6.How does Aetrix verify that SN74ABT240APWLE is sourced from the original manufacturer or authorized distributors?
All SN74ABT240APWLE 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 SN74ABT240APWLE meets industry standards.
7.What is the process for return or replacement of SN74ABT240APWLE?
All SN74ABT240APWLE units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT240APWLE, 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 SN74ABT240APWLE part is unused and in its original packaging.
Return procedure for SN74ABT240APWLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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