SN74AS240ADW Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74AS240ADW is an octal inverting bus driver with three-state outputs from Texas Instruments in the Advanced Schottky (AS) logic family, featuring active-low output enable control and a maximum output sink current of 64 mA in a 20-pin SOIC package. It is designed for high-speed unidirectional bus driving with a 50 pF load capacitance rating. Available from authorized distributors worldwide with competitive pricing and global shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- SN74AS240ADW Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- High-drive three-state outputs with 64 mA maximum sink current for robust bus driving of heavy TTL loads and backplane lines
- Advanced Schottky (AS) family providing the fastest propagation speed in the TTL logic family lineup, ideal for high-throughput bus interfaces
- Active-low output enable (ENABLE LOW) control for simple bus release and tristate operation in multi-driver bus architectures
- 20-pin SOIC (R-PDSO-G20) surface-mount package enabling high-density PCB assembly in data bus and memory interface designs
Applications
The SN74AS240ADW is used in high-speed data bus driving applications including microprocessor address and data bus buffering, memory bus interface circuits, and backplane driver designs where fast propagation delay and high output drive strength are required. Its Advanced Schottky technology makes it suitable for performance-critical applications such as cache memory controllers, high-speed DSP interfaces, and FPGA bus expansion circuits. The three-state output with active-low enable allows clean bus sharing among multiple drivers in shared-bus architectures.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | AS |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.064A |
| Number of Bits | 4 |
| Number of Functions | 8 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 75mA |
| Prop. Delay@Nom-Sup | 6.5ns |
| Propagation Delay (tpd) | 6.5ns |
| Qualification Status | Not Qualified |
| Screening Level | MIL-PRF-38535 |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74AS240ADW:
Frequently Asked Questions
What logic family is the SN74AS240ADW and what are its speed advantages?
The SN74AS240ADW belongs to the Advanced Schottky (AS) TTL logic family, which offers the fastest propagation delays in the TTL family group. The AS family provides approximately 50% faster switching than ALS devices while maintaining full TTL voltage compatibility, making it ideal for performance-critical bus driving applications.
What is the output drive capability of the SN74AS240ADW?
The SN74AS240ADW can sink up to 64 mA maximum output low current (IOL max), enabling it to drive multiple TTL loads or long PCB bus traces without signal degradation. This high drive strength is essential for backplane bus drivers and memory interface circuits where significant capacitive and resistive loading is expected.
How are the three-state outputs of the SN74AS240ADW controlled?
The SN74AS240ADW uses active-low output enable (ENABLE LOW) control inputs to engage or release the three-state outputs. When the enable input is held high, all eight outputs enter a high-impedance state, allowing the device to release the bus. This tristate control is fundamental for bus multiplexing in shared data and address bus systems.
What package does the SN74AS240ADW use and is it RoHS compliant?
The SN74AS240ADW is housed in a 20-pin SOIC package (JESD-30 code R-PDSO-G20). It is RoHS compliant with a Pb-free code of 'Yes' and JESD-609 code e4, confirming it meets lead-free environmental standards. The SOP20 package is compatible with standard surface-mount PCB assembly processes.
What is the specified load capacitance for the SN74AS240ADW and how does it affect performance?
The SN74AS240ADW is characterized at a load capacitance of 50 pF. Propagation delay increases proportionally with capacitive load above this value. For reliable timing in high-speed systems, PCB trace lengths should be minimized and bus termination should be considered when driving loads that exceed this specification.
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Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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