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Texas Instruments SN74ABT2240APWLE
- Part No.:
- SN74ABT2240APWLE
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ABT2240APWLE.pdf
- Description:
- BUS DRIVER, ABT SERIES, 4-BIT
- Quantity:
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Inventory:11,000
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Product details
Overview
SN74ABT2240APWLE from Texas Instruments is an octal noninverting 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, and operation over –40°C to 85°C.
For engineers reviewing the SN74ABT2240APWLE datasheet, SN74ABT2240APWLE pinout, SN74ABT2240APWLE application, or SN74ABT2240APWLE equivalent, key selection criteria include 3-state bus driving capability, TTL-compatible input thresholds, low ground bounce (<1 V), latch-up immunity (>500 mA), and TSSOP-20 packaging for high-density PCB layouts.
Technical Context
This device implements dual 4-bit noninverting buffers with symmetrical active-low OE controls per section. Each output incorporates on-die 25-Ω series termination to suppress overshoot/undershoot without external components. The EPIC-IIB BiCMOS process enables high-speed switching (tPHL/tPLH ≤ 5.1 ns at 5 V) while limiting ICC to 30 mA max under full load.
Input thresholds comply with TTL levels (VIL = 0.8 V, VVIH = 2 V), and output drive supports 12 mA sink / –24 mA source. High-impedance state is ensured during power sequencing via external pull-up on OE, and latch-up performance 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 mixed-voltage systems |
| Output Drive | 12 mA sink / –24 mA source - sufficient to drive multiple TTL loads or terminated transmission lines |
| Propagation Delay | ≤ 5.1 ns (A→Y, VCC = 5 V) - enables use in high-speed address/data buffering up to ~100 MHz |
| 3-State Enable Time | tPZH ≤ 4.7 ns - fast output disable supports dynamic bus sharing in multiplexed architectures |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - direct TTL-level interfacing without level shifters |
| On-Die Termination | 25-Ω series resistor per output - eliminates need for external series resistors, reducing BOM count and layout area |
| ESD Protection | >2000 V HBM, >200 V MM - robust handling in manufacturing and field-replaceable modules |
Pinout & Package
TSSOP-20 package (PW), 6.5 mm × 4.4 mm, 0.65 mm pitch, 1.2 mm max height - optimized for automated assembly and space-constrained boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control of each 4-bit section; must be pulled high via resistor for safe power-up high-Z state |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for respective output groups; TTL-compatible voltage thresholds |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Each includes 25-Ω series resistor; sink up to 12 mA, source up to 24 mA |
| VCC, GND | Power supply terminals | Single 5-V supply; decoupling required within 10 mm of pins 10 and 11 per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω series output resistors | Eliminates external termination components, reduces signal reflections on PCB traces up to 10 cm |
| EPIC-IIB BiCMOS process | Reduces dynamic power vs. pure bipolar while maintaining TTL speed and drive strength |
| Low ground bounce (VOLP < 1 V) | Minimizes noise coupling into adjacent logic or analog circuits during simultaneous output switching |
| Latch-up immunity >500 mA | Ensures robustness against transient overcurrent events in industrial or hot-swap environments |
| Wide operating temperature range | –40°C to +85°C rating supports deployment in commercial and extended-temperature embedded systems |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
Use Scenario: Driving 20-bit address bus between microcontroller and SRAM/Flash in a compact industrial controller. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing fan-out expansion and bus isolation during DMA cycles. Use Value: Integrated 25-Ω resistors suppress ringing on 5-cm address traces; tPHL ≤ 5.1 ns ensures setup margin for 20-MHz bus timing. | Use Scenario: Bidirectional data bus arbitration between FPGA and peripheral ASIC in test equipment. IC Role / Device Role / Timing Role: Dual-section 3-state driver enabling time-multiplexed read/write direction control via separate OE signals. Use Value: Independent 1OE/2OE allows staggered enable timing to prevent bus contention; 12 mA sink supports 10-TTL load fan-out. |
| Clock Distribution Fan-Out | Legacy System Bus Extension |
Use Scenario: Distributing a 25-MHz system clock to four synchronous logic blocks in a legacy instrumentation platform. IC Role / Device Role / Timing Role: Low-skew noninverting buffer with matched propagation delay across all eight outputs. Use Value: Matched tPLH/tPHL (±0.5 ns typical) minimizes clock skew; 25-Ω series resistors dampen edge-induced EMI. | Use Scenario: Interfacing modern MCU GPIOs to ISA-bus peripherals in retro-computing hardware restoration. IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening buffer for 5-V TTL-compatible ISA data/address lines. Use Value: TTL-input thresholds and 24 mA sourcing capability meet ISA specification requirements; TSSOP-20 footprint fits dense legacy board layouts. |
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 |
|---|---|---|---|
| SN74ABT2244APWR | Inverting outputs (vs. noninverting in SN74ABT2240APWLE); identical pinout, timing, and drive specs | Requires logic inversion in upstream signal path; otherwise drop-in for inverted bus drivers | Select when system architecture requires inverted data polarity at the driver output stage |
| SN74LVC244APWR | 3.3-V only operation (1.65–3.6 V), lower drive (24 mA sink/source), no integrated 25-Ω resistors | Not suitable for 5-V buses; requires external termination; better for low-power, mixed-voltage domains | Choose for new 3.3-V designs where power efficiency outweighs legacy 5-V compatibility and integrated termination |
Compared with SN74ABT2240APWLE, SN74ABT2244APWR offers functional equivalence with polarity inversion, while SN74LVC244APWR trades 5-V compatibility and on-die termination for lower voltage operation and reduced static current - making the former a direct functional alternative and the latter a domain-specific upgrade path.
Availability
SN74ABT2240APWLE is available at Aetrix Electronics and suitable for memory address buffering, bus transceiver interfaces, clock distribution fan-out, and legacy system bus extension requiring stable component supply and long-lifecycle support.
Supply support for SN74ABT2240APWLE 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The ABT family-including SN74ABT2240APWLE-is engineered for high-speed, high-drive 5-V TTL-compatible bus interface applications, emphasizing signal integrity, latch-up immunity, and robust operation in demanding environments.
FAQ
What is the operating temperature range for SN74ABT2240APWLE?
The SN74ABT2240APWLE is characterized for operation from –40°C to +85°C. This commercial-extended temperature range supports reliable deployment in industrial controllers, test equipment, and networking hardware where ambient conditions exceed standard commercial limits but do not require full military-grade specifications.
Does SN74ABT2240APWLE require external series resistors on its outputs?
No. The SN74ABT2240APWLE integrates 25-Ω series resistors on all eight outputs, eliminating the need for external termination components. This feature reduces PCB component count, saves layout area, and improves signal integrity on short-to-medium-length traces by suppressing overshoot and undershoot without design iteration.
Can SN74ABT2240APWLE drive standard TTL loads directly?
Yes. The SN74ABT2240APWLE provides 12 mA sink and –24 mA source capability per output, exceeding the –0.4 mA / 1.6 mA requirements of standard TTL. Its input thresholds (VIL = 0.8 V, VIH = 2.0 V) are fully TTL-compatible, enabling direct connection to legacy 5-V logic families without level translation.
What is the recommended power-up sequence for SN74ABT2240APWLE?
To ensure outputs remain in high-impedance state during power-up, OE pins (1OE and 2OE) must be held high via pull-up resistors to VCC. TI recommends a minimum pull-up value determined by the driver's current-sinking capability - typically 10 kΩ suffices for most applications. This prevents bus contention before system initialization completes.
Is SN74ABT2240APWLE pin-compatible with other ABT-series octal buffers?
Yes - SN74ABT2240APWLE shares identical TSSOP-20 pinout with SN74ABT2244APWR (inverting version) and SN74ABT2240APWR (active version). All three support the same 20-pin layout, enabling layout reuse across polarity and lifecycle variants, though firmware or schematic logic must account for inversion differences in the 2244 variant.
SN74ABT2240APWLE 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:
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- Supplier Device Package:
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SN74ABT2240APWLE FAQ
1.How can I place an order for SN74ABT2240APWLE through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT2240APWLE 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 SN74ABT2240APWLE reliable?
The price and inventory of SN74ABT2240APWLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT2240APWLE is usually 5 days.
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Once your SN74ABT2240APWLE 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 SN74ABT2240APWLE?
For technical support, including SN74ABT2240APWLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT2240APWLE requirements.
6.How does Aetrix verify that SN74ABT2240APWLE is sourced from the original manufacturer or authorized distributors?
All SN74ABT2240APWLE 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 SN74ABT2240APWLE meets industry standards.
7.What is the process for return or replacement of SN74ABT2240APWLE?
All SN74ABT2240APWLE units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2240APWLE, 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 SN74ABT2240APWLE part is unused and in its original packaging.
Return procedure for SN74ABT2240APWLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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