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Texas Instruments SN74ABT2240DWR
- Part No.:
- SN74ABT2240DWR
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ABT2240DWR.pdf
- Description:
- BUS DRIVER, ABT SERIES, 4-BIT
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Product details
Overview
SN74ABT2240DWR from Texas Instruments is an octal inverting buffer/line driver with 3-state outputs, designed for memory address and bus-oriented applications. It features dual 4-bit sections with independent active-low OE inputs, 25-Ω integrated output series resistors, ±12 mA output drive, and operation across –40°C to 85°C at 4.5–5.5 V supply.
For engineers reviewing the SN74ABT2240DWR datasheet, SN74ABT2240DWR pinout, SN74ABT2240DWR application, or SN74ABT2240DWR equivalent, key selection criteria include its 20-pin SOIC-DW package, TTL-compatible input thresholds, 3-state timing (tPZL ≤ 6.8 ns), low ground bounce (<1 V), and BiCMOS process enabling high fan-out with reduced power dissipation.
Technical Context
This device implements two independent 4-bit inverting buffer sections, each with a dedicated active-low output-enable (OE) control. Inputs accept standard TTL voltage levels (VIL = 0.8 V, VIH = 2 V), and outputs drive up to 12 mA low or –24 mA high while maintaining VOH ≥ 2.5 V at IOL = 12 mA and VCC = 4.5 V.
The internal 25-Ω series resistor per output suppresses overshoot/undershoot without external components. Its EPIC-IIB BiCMOS architecture delivers fast propagation delays (tPLH/tPHL ≤ 4.8 ns), low ICC in active state (≤30 mA), and ultra-low leakage in 3-state mode (IOZL/IOZH ≤ ±10 µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with 5-V TTL and mixed-voltage system interfaces. |
| Output Drive | 12 mA sink / –24 mA source - Supports direct connection to multiple TTL loads without buffering. |
| Propagation Delay | tPLH/tPHL ≤ 4.8 ns @ CL = 50 pF - Enables reliable operation in high-speed address/data bus timing paths. |
| 3-State Enable Time | tPZL ≤ 6.8 ns, tPHZ ≤ 6.4 ns - Minimizes bus contention windows during dynamic bus sharing. |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - Matches standard TTL logic families for seamless interoperability. |
| Output Series Resistor | 25 Ω integrated - Eliminates need for external termination resistors on PCB traces. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded and computing applications. |
Pinout & Package
SN74ABT2240DWR is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, with standard 0.050″ (1.27 mm) lead pitch and RoHS-compliant CU NIPDAU finish. Moisture sensitivity level is Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 19 | Section 1 Output Enable (active-low) | Controls Y1–Y4 outputs; must be pulled high via resistor during power-up to ensure high-impedance default. |
| 2OE, 2 | Section 2 Output Enable (active-low) | Independent control of Y1–Y4 outputs; enables time-multiplexed bus driving or isolation. |
| 1A1–1A4, 2–4,6,8 | Section 1 Inverting Input Ports | Accept TTL-level signals; invert and drive corresponding Y outputs when OE is low. |
| 2A1–2A4, 11,13,15,17 | Section 2 Inverting Input Ports | Separate 4-bit input group with independent OE; supports dual-bus or mirrored signal paths. |
| 1Y1–1Y4, 18,16,14,12 | Section 1 Inverting Outputs | Drive inverted A-input data with 25-Ω series resistance; sink up to 12 mA per output. |
| 2Y1–2Y4, 9,7,5,3 | Section 2 Inverting Outputs | Matched electrical characteristics to Section 1; allows symmetrical layout in dense PCB designs. |
| VCC, 20 | Positive Supply | Must be decoupled locally; supports 4.5–5.5 V operation with typical ICC ≤ 30 mA under full load. |
| GND, 10 | Ground Reference | Common return for all I/O and supply currents; critical for minimizing VOLP (ground bounce <1 V). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω output series resistors | Eliminates external termination components and reduces PCB routing complexity for controlled-impedance traces. |
| EPIC-IIB BiCMOS process | Combines bipolar speed and CMOS low static power, achieving <1 V ground bounce and <250 µA ICC in 3-state mode. |
| High-current 3-state outputs | 12 mA sink capability per output ensures robust drive into unterminated or lightly loaded buses. |
| TTL-compatible input thresholds | VIL = 0.8 V / VIH = 2.0 V guarantees interoperability with legacy 5-V logic families without level-shifting. |
| Latch-up immunity >500 mA | Meets JESD17 requirements, enabling reliable operation in noisy industrial environments with transient coupling. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or ROM chips on a shared memory bus. IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation, fan-out expansion, and 3-state isolation between master and slave devices. Use Value: Integrated 25-Ω resistors suppress ringing on long address traces; tPZL ≤ 6.8 ns ensures clean bus release before next cycle. |
Use Scenario: Bidirectional data path control between CPU and peripheral ICs using a single 8-bit data bus. IC Role / Device Role / Timing Role: Dual-section 3-state driver enabling time-multiplexed read/write direction control via separate OE pins. Use Value: Independent OE inputs allow precise timing of bus ownership handoff; low VOLP prevents data corruption during switching transients. |
| Clock Distribution Network | Legacy System Bus Driver |
|
Use Scenario: Distributing a system clock or strobe signal to multiple synchronous peripherals with matched skew. IC Role / Device Role / Timing Role: Low-skew inverting buffer replicating one clock source to eight destinations with identical delay profiles. Use Value: Symmetrical tPLH/tPHL (≤4.8 ns) and matched internal paths minimize inter-channel skew across all eight outputs. |
Use Scenario: Interfacing modern controllers with legacy ISA, PC/104, or industrial backplane buses requiring 5-V TTL drive strength. IC Role / Device Role / Timing Role: Robust line driver meeting legacy bus voltage, current, and timing specifications (e.g., ISA address setup/hold). Use Value: 12 mA sink drive and 2.5 V VOH at 4.5 V VCC satisfy strict TTL loading requirements; latch-up immunity protects against bus fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT2244ADWR | Non-inverting output polarity; otherwise identical pinout, timing, and drive specs. | Required where signal inversion must be avoided in address/data paths. | Select when system logic requires true (non-inverted) signal replication rather than complemented outputs. |
| SN74LVC244APWR | 3.3-V only operation (1.65–3.6 V); lower drive (24 mA), no integrated 25-Ω resistors. | Suitable for modern low-voltage systems but incompatible with 5-V buses without level shifters. | Choose for cost-sensitive 3.3-V designs where external termination is acceptable and 5-V tolerance is unnecessary. |
Compared with SN74ABT2240DWR, SN74ABT2244ADWR preserves pin compatibility and performance while reversing logic polarity, whereas SN74LVC244APWR trades 5-V operation and integrated termination for lower voltage and higher speed-requiring redesign for voltage domain and signal integrity.
Availability
SN74ABT2240DWR is available at Aetrix Electronics and suitable for industrial control panels, legacy computer backplanes, and memory subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant 5-V logic interfacing.
Supply support for SN74ABT2240DWR 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 high-reliability interface and signal-path components.
The SN74ABT2240DWR belongs to TI's ABT logic family, engineered for high-speed 5-V bus interfacing in industrial, computing, and communications equipment where noise immunity, drive strength, and timing predictability are critical.
FAQ
What is the recommended power-up sequence for SN74ABT2240DWR to avoid bus contention?
During power-up, tie both 1OE and 2OE pins to VCC through a pullup resistor (minimum value determined by driver sink capability, typically 1–10 kΩ). This ensures all outputs remain in high-impedance until system firmware asserts valid enable signals. The SN74ABT2240DWR's design requires this to prevent unintended drive onto shared buses before controller initialization completes.
Does SN74ABT2240DWR support hot-swap or live-insertion applications?
No-SN74ABT2240DWR is not rated for hot-swap operation. Its absolute maximum ratings do not include powered insertion, and the lack of Ioff (power-off protection) means VCC must be stable before applying input signals. For hot-swap use cases, consider TI's TVS-protected or hot-swap–qualified buffers instead of the SN74ABT2240DWR.
Can SN74ABT2240DWR drive unterminated 50-Ω transmission lines directly?
Yes-the integrated 25-Ω series resistor per output is optimized for driving standard 50-Ω PCB traces in point-to-multipoint configurations. When paired with a 50-Ω load, it forms a near-critical damping network, reducing overshoot and undershoot without discrete components. This behavior is confirmed in the SN74ABT2240DWR datasheet's schematic of Y outputs and application notes on controlled-impedance routing.
What is the maximum capacitive load SN74ABT2240DWR can drive while maintaining specified timing?
The SN74ABT2240DWR's switching characteristics (e.g., tPLH ≤ 4.8 ns) are characterized at CL = 50 pF. Driving loads beyond 50 pF increases propagation delay nonlinearly and may degrade edge rate; for >50 pF, derating curves in the SN74ABT2240DWR datasheet show tPLH rises to ~7 ns at 100 pF. Keep total node capacitance ≤50 pF for guaranteed timing compliance.
How does the EPIC-IIB process in SN74ABT2240DWR improve reliability versus standard bipolar logic?
The EPIC-IIB BiCMOS process combines bipolar transistors for speed and CMOS for low static power, resulting in <1 V typical VOLP (ground bounce) and latch-up immunity exceeding 500 mA per JESD17. This significantly improves noise margin and fault tolerance in electrically noisy industrial environments compared to pure bipolar 74F or 74AS logic-key advantages built into the SN74ABT2240DWR's architecture.
SN74ABT2240DWR 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:
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- Input Type:
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- Output Type:
- -
- Current - Output High, Low:
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- Voltage - Supply:
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- Operating Temperature:
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SN74ABT2240DWR FAQ
1.How can I place an order for SN74ABT2240DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT2240DWR 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 SN74ABT2240DWR reliable?
The price and inventory of SN74ABT2240DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT2240DWR is usually 5 days.
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Once your SN74ABT2240DWR 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 SN74ABT2240DWR?
For technical support, including SN74ABT2240DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT2240DWR requirements.
6.How does Aetrix verify that SN74ABT2240DWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT2240DWR 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 SN74ABT2240DWR meets industry standards.
7.What is the process for return or replacement of SN74ABT2240DWR?
All SN74ABT2240DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2240DWR, 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 SN74ABT2240DWR part is unused and in its original packaging.
Return procedure for SN74ABT2240DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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