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MC74AC540DW
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Product Detailed Parameters
- Description：IC BUFF INVERT 6V 20SOIC
- Series：74AC
- Mfr：onsemi
- Package：Tube
- Logic Type：Buffer, Inverting
- Number of Elements：1
- Number of Bits per Element：8
- Input Type：-
- Output Type：3-State
- Current - Output High, Low：24mA, 24mA
- Voltage - Supply：2V ~ 6V
- Operating Temperature：-40°C ~ 85°C (TA)
- Mounting Type：Surface Mount
- Package / Case：20-SOIC (0.295", 7.50mm Width)
- Supplier Device Package：20-SOIC
- Grade：-
- Qualification：-
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Overview
The MC74AC540DWG is an octal buffer and line driver manufactured by onsemi, designed for memory, address, and clock driving applications. It features a flow-through architecture with inputs and outputs located on opposite sides of the package to facilitate microprocessor interface and PCB layout density. The device provides three-state outputs and operates within a supply voltage range of 2.0 V to 6.0 V. It delivers high drive capability with output currents of ±24 mA. Propagation delays are specified at 7.5 ns at 3.3 V and 6.0 ns at 5.0 V. The component is housed in a 20-lead SOIC-Wide (SOIC-20W) surface-mount package.
Feature Summary
- Flow-through architecture with inputs and outputs positioned on opposite sides of the package to simplify microprocessor interfacing and improve board density.
- Three-state outputs that allow the device to switch between high, low, and high-impedance states to isolate signals from the bus when not enabled.
- High drive capability providing 24 mA source and sink current to support multiple loads.
Applications
- Memory and address drivers
- Clock drivers
- Bus-oriented transmitter/receivers
Procurement Notes
Verify the specific ordering suffix 'DW' corresponds to the SOIC-20 Wide package configuration. Confirm the presence of the 'G' suffix indicates a lead-free package compliant with RoHS standards. Ensure the procurement documentation matches the exact part number MC74AC540DWG to guarantee correct logic polarity and electrical specifications.
Selection Notes
Select this component when a non-inverting octal buffer with three-state control is required for bus-oriented applications. The flow-through pinout is specifically advantageous for designs requiring ease of layout and greater PC board density compared to standard parallel I/O configurations. Verify that the operating voltage range of 2.0 V to 6.0 V aligns with the system power supply requirements.
Part Context
This device belongs to the MC74AC540/541 series of octal buffers and line drivers. It serves as a functional alternative to similar devices like the MC74AC240 and MC74AC244 but distinguishes itself through its unique flow-through input/output arrangement. This architectural choice makes it particularly suitable for microprocessor output ports where signal routing efficiency is critical.
Replacement Considerations
MC74AC541DWG (Non-inverting version)
FAQ
What is the logic polarity of the MC74AC540?
The MC74AC540 provides inverted outputs. For non-inverted operation, the MC74AC541 should be used.
How does the flow-through architecture benefit circuit design?
By placing inputs on one side of the package and outputs on the opposite side, the device allows for easier interface to microprocessors and enables greater printed circuit board density.
