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Texas Instruments SN74ABT240APW
- Part No.:
- SN74ABT240APW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT240APW.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:368
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Product details
Overview
SN74ABT240APW 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 support for partial-power-down operation, and operates over –40°C to 85°C with 4.5–5.5 V supply. It is used in industrial control backplanes and legacy data bus isolation.
For engineers reviewing the SN74ABT240APW datasheet, SN74ABT240APW pinout, SN74ABT240APW application, or SN74ABT240APW equivalent, key selection criteria include its 20-pin TSSOP package, dual 4-bit inverting architecture with independent OE controls, ground-bounce performance (<1 V), and compatibility with TTL-level input thresholds.
Technical Context
The SN74ABT240APW implements two independent 4-bit inverting buffer sections, each with a dedicated active-low output-enable (OE) input. When OE is low, inverted data passes from A inputs to Y outputs; when OE is high, outputs enter high-impedance state. The device uses ABT (Advanced BiCMOS Technology) logic for enhanced speed and drive strength.
It supports partial-power-down via Ioff circuitry that disables outputs when VCC = 0 V, preventing current backflow. Input clamp diodes and robust ESD protection (2000-V HBM, 200-V MM) ensure reliability in noisy industrial environments. Propagation delays are specified at 1–4.8 ns (tPLH/tPHL) under 5 V/25°C/50 pF conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and mixed-voltage system rails. |
| IOH / IOL | –32 mA / 64 mA - Enables direct driving of heavy capacitive loads or multiple TTL inputs without external buffers. |
| tPLH / tPHL | 1 ns (min) to 4.8 ns (max) - Supports high-speed bus timing in 25–33 MHz synchronous systems. |
| Ioff | ±100 µA at VCC = 0 - Allows safe hot-insertion and power sequencing in modular backplane designs. |
| VOL / VOH | 0.55 V (at 64 mA) / 2.0 V (at –32 mA) - Guarantees valid TTL logic levels under full load, ensuring noise margin >0.4 V. |
| ESD Rating | 2000-V HBM, 200-V MM - Meets industrial handling requirements without additional protection circuitry. |
| Operating Temp | –40°C to +85°C - Qualified for extended-temperature industrial and telecom infrastructure use. |
Pinout & Package
TSSOP-20 (PW) package: 6.95 mm × 4.4 mm × 1.2 mm body, 0.65 mm lead pitch, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable | Independent control per 4-bit section; must be pulled high via resistor during power-up to ensure Hi-Z default state. |
| 1A1–1A4, 2A1–2A4 | Inverting data inputs | Accept TTL-compatible logic levels; VIH = 2 V min, VIL = 0.8 V max ensures robust noise immunity. |
| 1Y1–1Y4, 2Y1–2Y4 | Inverting 3-state outputs | Drive capability up to 64 mA sink; high-impedance leakage < ±10 µA enables bus sharing. |
| VCC (Pin 10) | Power supply | Must be decoupled locally with 0.1 µF ceramic capacitor; thermal resistance θJA = 83°C/W limits power dissipation. |
| GND (Pin 11) | Ground reference | Common return for all I/O and supply currents; layout requires low-inductance connection to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| High-drive outputs | –32 mA source / 64 mA sink capability eliminates need for external line drivers in dense bus architectures. |
| Ioff partial-power-down | Prevents damaging back-current flow when VCC is off, enabling safe insertion into live backplanes or hot-swap modules. |
| Low ground bounce (VOLP) | <1 V at 5 V/25°C - Reduces signal integrity risk in multi-driver parallel bus configurations. |
| Latch-up immunity | >500 mA per JEDEC JESD17 - Ensures survivability under transient overvoltage or ESD stress events. |
| Wide temperature range | –40°C to +85°C operation - Validated for deployment in uncontrolled industrial enclosures and outdoor telecom cabinets. |
Applications
| Memory Address Buffering | Legacy Bus Isolation |
|---|---|
Use Scenario: Driving address lines from microcontroller to multiple SRAM or EPROM devices on a shared bus. IC Role / Device Role / Timing Role: Inverting octal buffer providing level translation and fanout expansion while maintaining setup/hold timing margins. Use Value: High sink current (64 mA) ensures clean low-level transitions across 100+ pF trace capacitance; tPHL < 4.8 ns preserves address valid window in 25-MHz cycles. | Use Scenario: Isolating ISA or PCI-legacy control signals between motherboard and add-in card during power sequencing. IC Role / Device Role / Timing Role: 3-state bidirectional buffer enabling controlled signal gating and domain separation. Use Value: Ioff support allows card insertion while system is powered; independent OE pins permit staggered enable timing to avoid bus contention. |
| Industrial Backplane Interface | Test Equipment Signal Conditioning |
Use Scenario: Interfacing PLC CPU outputs to distributed I/O modules over long parallel backplane traces. IC Role / Device Role / Timing Role: Robust driver buffering noisy control signals with ground-bounce suppression. Use Value: VOLP < 1 V prevents false triggering on adjacent lines; latch-up immunity (>500 mA) withstands field-induced transients. | Use Scenario: Conditioning digital stimulus signals in automated test equipment before routing to DUT. IC Role / Device Role / Timing Role: Precision inverting buffer adding gain control and output isolation. Use Value: Tight propagation delay matching (tPLH/tPHL variation < 1.5 ns) ensures skew-critical timing alignment across 8-channel pattern generators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT240ADWR | SOIC-20 package (7.5 mm width); θJA = 58°C/W vs. 83°C/W for PW; same electrical specs. | Better thermal performance in high-density PCB layouts; larger footprint suits manual assembly or prototyping. | Select when board space permits and thermal headroom is constrained; not drop-in due to different land pattern. |
| SN74ABT240ANSR | SOP-20 package (5.3 mm width); identical pinout and timing; slightly lower IOL (48 mA vs. 64 mA). | Lower drive strength acceptable for short-trace, low-capacitance applications; cost-optimized for consumer-grade systems. | Choose for cost-sensitive designs where 48 mA sink suffices and SOP footprint aligns with existing tooling. |
Compared with SN74ABT240ADWR and SN74ABT240ANSR, the SN74ABT240APW offers the smallest PCB footprint (TSSOP) and highest sink current (64 mA), making it optimal for space-constrained industrial modules requiring maximum drive strength without thermal derating penalties.
Availability
SN74ABT240APW is available at Aetrix Electronics and suitable for industrial control backplanes, legacy bus isolation, and test equipment signal conditioning requiring stable component supply and long-term lifecycle support.
Supply support for SN74ABT240APW 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 heritage in industrial and automotive-grade components.
The SN74ABT240APW belongs to TI's ABT logic family, engineered for high-speed, high-drive 3-state bus interface applications in industrial automation, telecom infrastructure, and legacy computing systems.
FAQ
What is the recommended pull-up resistor value for OE pins on the SN74ABT240APW?
The OE pins on the SN74ABT240APW should be tied to VCC through a pull-up resistor to ensure high-impedance state during power-up. Based on the device's input leakage (±1 µA max) and required noise margin, a 10-kΩ resistor is recommended - it provides sufficient current sinking capability while minimizing quiescent power draw and avoiding excessive loading on the VCC rail.
Does the SN74ABT240APW support mixed-voltage operation between input and output domains?
No, the SN74ABT240APW does not support true mixed-voltage operation. Its inputs are TTL-compatible (VIH = 2 V, VIL = 0.8 V) and outputs swing rail-to-rail relative to the single VCC supply (4.5–5.5 V). It cannot interface directly with 3.3-V logic without level-shifting circuitry, as input voltages exceeding VCC + 0.5 V or below GND – 0.5 V violate absolute maximum ratings.
How does the Ioff feature function on the SN74ABT240APW during power-down sequences?
The Ioff feature on the SN74ABT240APW disables all output buffers when VCC = 0 V, limiting current flow to ±100 µA regardless of input or output voltage (≤4.5 V). This prevents back-driving powered-down sections of a system, protecting both the SN74ABT240APW and downstream components during hot-swap or partial-power-down scenarios in modular backplanes.
Can the SN74ABT240APW be used in place of the SN74ABT240AN (PDIP) without layout changes?
No, the SN74ABT240APW (TSSOP-20) is not a drop-in replacement for the SN74ABT240AN (PDIP-20). While pinout and logic function are identical, the TSSOP package has 0.65 mm lead pitch, 6.95 mm × 4.4 mm body size, and requires reflow soldering - incompatible with through-hole assembly or PDIP land patterns. PCB redesign is mandatory.
What is the maximum capacitive load the SN74ABT240APW can drive while maintaining specified timing?
The SN74ABT240APW switching characteristics (e.g., tPLH ≤ 4.8 ns) are characterized at CL = 50 pF. While it can drive higher capacitance (e.g., 100–150 pF), propagation delay increases linearly - expect ~7–9 ns at 100 pF. For reliable 25-MHz bus operation, total trace + load capacitance should remain ≤ 75 pF to preserve setup/hold margins; use series termination if exceeding this limit.
SN74ABT240APW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74ABT240APW FAQ
1.How can I place an order for SN74ABT240APW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT240APW 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 SN74ABT240APW reliable?
The price and inventory of SN74ABT240APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT240APW is usually 5 days.
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4.How is shipping managed for SN74ABT240APW?
SN74ABT240APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT240APW 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 SN74ABT240APW?
For technical support, including SN74ABT240APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT240APW requirements.
6.How does Aetrix verify that SN74ABT240APW is sourced from the original manufacturer or authorized distributors?
All SN74ABT240APW 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 SN74ABT240APW meets industry standards.
7.What is the process for return or replacement of SN74ABT240APW?
All SN74ABT240APW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT240APW, 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 SN74ABT240APW part is unused and in its original packaging.
Return procedure for SN74ABT240APW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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