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Texas Instruments SN74ABT240ADB
- Part No.:
- SN74ABT240ADB
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ABT240ADB.pdf
- Description:
- BUS DRIVER, ABT SERIES, 4-BIT
- Quantity:
- Payment:
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Inventory:17,226
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Product details
Overview
SN74ABT240ADB from Texas Instruments is an octal inverting buffer/line driver with 3-state outputs, designed for memory address and bus-oriented applications. It features two independent 4-bit sections, each with active-low output-enable (OE), 25-Ω integrated series output resistors, ±12 mA output drive capability, and operation over –40°C to 85°C.
For engineers reviewing the SN74ABT240ADB datasheet, SN74ABT240ADB pinout, SN74ABT240ADB application, or SN74ABT240ADB equivalent, this device supports high-density bus driving with reduced signal integrity issues due to on-die termination, low ground bounce (<1 V), and robust ESD protection (2000 V HBM).
Technical Context
This BiCMOS octal buffer implements dual 4-bit inverting logic paths with symmetrical active-low OE controls per section. Each output incorporates a built-in 25-Ω series resistor to suppress overshoot/undershoot without external components.
It operates at 4.5–5.5 V supply, delivers 12 mA sink current per output, and achieves typical propagation delays of 1–4.8 ns (tPLH/tPHL) and enable/disable times as low as 1.1 ns (tPZH). Latch-up immunity exceeds 500 mA per JESD17.
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 CMOS systems. |
| Output Drive | 12 mA sink per Y output - Supports direct connection to standard TTL loads without external pull-ups. |
| Propagation Delay | 1.0–4.8 ns (tPLH/tPHL @ VCC=5 V, CL=50 pF) - Enables high-speed bus timing in memory and clock distribution circuits. |
| Output Series Resistance | 25 Ω integrated - Eliminates need for external series termination resistors on PCB traces. |
| Ground Bounce (VOLP) | <1 V @ VCC=5 V, TA=25°C - Reduces noise coupling into shared ground planes during simultaneous switching. |
| ESD Protection | 2000 V HBM, 200 V MM - Meets MIL-STD-883 requirements for ruggedness in industrial environments. |
| Latch-Up Immunity | >500 mA per JESD17 - Guarantees fault tolerance under transient overcurrent conditions. |
Pinout & Package
SN74ABT240ADB uses a 20-pin SSOP (Shrink Small-Outline Package) with 0.65 mm pitch, JEDEC MO-150 compliant, body dimensions 7.5 mm × 5.3 mm × 1.95 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control inputs | Enable/disable respective 4-bit sections independently; must be pulled high via resistor during power-up to ensure high-Z state. |
| 1A1–1A4, 2A1–2A4 | Inverting data inputs | Accept TTL/CMOS-level signals; drive inverted logic to corresponding Y outputs when OE is low. |
| 1Y1–1Y4, 2Y1–2Y4 | Inverting 3-state outputs | Deliver inverted A-input logic with 25-Ω series resistance; enter high-impedance state when OE is high. |
| VCC | Positive supply | 5-V nominal supply rail; decoupling capacitor required near pin for stable operation. |
| GND | Ground reference | Common return path for all I/O and internal circuitry; critical for minimizing ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω output series resistors | Eliminates external termination components, reduces PCB area and BOM count for bus drivers. |
| EPIC-IIB BiCMOS process | Combines bipolar speed and CMOS low static power, achieving <1 V ground bounce and sub-5 ns propagation delay. |
| High fan-out capability | Drives up to 12 standard TTL loads per output, enabling dense memory address and data bus expansion. |
| Robust 3-state control architecture | Dual independent OE inputs allow selective activation of either 4-bit section, supporting partial bus isolation. |
| MIL-STD-883 qualified ESD and latch-up performance | 2000 V HBM ESD rating and >500 mA latch-up immunity ensure reliability in harsh industrial environments. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
Use Scenario: Driving address lines from microcontroller or FPGA to multiple SRAM or EPROM chips in a shared-memory system. IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation, fan-out amplification, and controlled 3-state isolation between master and slave devices. Use Value: Integrated 25-Ω resistors suppress ringing on long address traces, while fast 1–4.8 ns delays preserve setup/hold timing margins. | Use Scenario: Bidirectional data bus isolation between processor and peripheral ICs using external direction control. IC Role / Device Role / Timing Role: One-directional 3-state line driver used in half-duplex configurations where separate transmit/receive paths are implemented. Use Value: Dual OE inputs allow precise timing control of data launch windows, reducing bus contention risk during state transitions. |
| Legacy System Bus Expansion | Clock Distribution Buffering |
Use Scenario: Extending ISA or LPC bus segments in industrial control backplanes requiring signal integrity preservation over 10+ cm traces. IC Role / Device Role / Timing Role: High-drive octal buffer isolating legacy CPU address/data buses from add-on expansion modules. Use Value: 12 mA sink capability ensures reliable logic-low assertion across unterminated stubs; low VOLP prevents false triggering of downstream receivers. | Use Scenario: Distributing a single system clock to multiple synchronous peripherals (e.g., ADCs, DACs, FPGAs) with matched skew. IC Role / Device Role / Timing Role: Inverting clock buffer delivering phase-aligned copies with minimized propagation delay variation across outputs. Use Value: Tight tPLH/tPHL matching (±0.5 ns typical) and integrated series termination reduce jitter accumulation and edge distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT240N | Same logic function and electrical specs, but in 20-pin PDIP package (7.62 mm pitch, through-hole mount). | Suitable for prototyping, legacy through-hole designs, or mixed-technology boards where SSOP reflow is not available. | Select SN74ABT240N when manual assembly, socketing, or thermal mass requirements favor DIP over surface-mount. |
| SN74LVC240APWR | 3.3-V only operation (1.65–3.6 V), lower drive (24 mA push/pull), no integrated 25-Ω resistors, higher input capacitance (4.5 pF). | Targeted for modern low-voltage digital systems; requires external termination and level-shifting for 5-V interfacing. | Choose SN74LVC240APWR only in new 3.3-V designs where power efficiency and smaller TSSOP-20 footprint outweigh loss of 5-V compatibility and on-die termination. |
Compared with SN74ABT240N and SN74LVC240APWR, SN74ABT240ADB uniquely combines 5-V operation, integrated 25-Ω output resistors, and SSOP packaging-making it optimal for space-constrained industrial bus interfaces requiring legacy voltage compatibility and signal integrity out-of-the-box.
Availability
SN74ABT240ADB is available at Aetrix Electronics and suitable for memory subsystems, industrial backplane interfaces, and legacy bus expansion applications requiring stable component supply and long-term industrial temperature support (–40°C to 85°C).
Supply support for SN74ABT240ADB 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 interface ICs.
The ABT logic family-including SN74ABT240ADB-is engineered for high-speed, low-noise 5-V bus driving in industrial, computing, and communications infrastructure where signal integrity and robustness are critical.
FAQ
What is the operating temperature range for SN74ABT240ADB?
The SN74ABT240ADB is characterized for operation from –40°C to +85°C, meeting industrial-grade environmental requirements. This range is validated per the recommended operating conditions in the official Texas Instruments datasheet SCBS232E, and applies specifically to the DB-package variants including SN74ABT240ADB.
Does SN74ABT240ADB include built-in series termination resistors?
Yes, SN74ABT240ADB integrates 25-Ω series resistors on all eight Y outputs. This design eliminates the need for external termination components, directly addressing signal integrity concerns like overshoot and undershoot in high-speed bus applications-confirmed in the "Output Ports Have Equivalent 25-Ω Series Resistors" feature statement of the datasheet.
Can SN74ABT240ADB drive standard TTL loads?
Yes, SN74ABT240ADB can drive up to 12 standard TTL loads per output, as specified by its 12 mA low-level output current (IOL) rating at VCC = 4.5 V. This capability is explicitly documented in the "recommended operating conditions" table of the SN74ABT2240A datasheet, which fully applies to SN74ABT240ADB as a member of the same ABT2240A family.
What is the maximum propagation delay for SN74ABT240ADB?
The maximum propagation delay for SN74ABT240ADB is 4.8 ns (tPHL) and 4.1 ns (tPLH) at VCC = 5 V and TA = 25°C with CL = 50 pF, per the SN74ABT2240A switching characteristics table. These values represent worst-case delays under standard test conditions and are guaranteed across the full industrial temperature range.
How should the OE pins be handled during power-up to avoid bus contention?
To ensure high-impedance outputs during power-up or power-down, both 1OE and 2OE pins of SN74ABT240ADB must be tied to VCC through a pull-up resistor. The minimum resistor value is determined by the current-sinking capability of the driving source, as stated in the functional description section of the datasheet-this prevents unintended output activation before system initialization completes.
SN74ABT240ADB 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:
- -
SN74ABT240ADB FAQ
1.How can I place an order for SN74ABT240ADB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT240ADB 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 SN74ABT240ADB reliable?
The price and inventory of SN74ABT240ADB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT240ADB is usually 5 days.
3.What payment methods are accepted for SN74ABT240ADB?
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4.How is shipping managed for SN74ABT240ADB?
SN74ABT240ADB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT240ADB 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 SN74ABT240ADB?
For technical support, including SN74ABT240ADB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT240ADB requirements.
6.How does Aetrix verify that SN74ABT240ADB is sourced from the original manufacturer or authorized distributors?
All SN74ABT240ADB 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 SN74ABT240ADB meets industry standards.
7.What is the process for return or replacement of SN74ABT240ADB?
All SN74ABT240ADB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT240ADB, 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 SN74ABT240ADB part is unused and in its original packaging.
Return procedure for SN74ABT240ADB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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