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Product Detailed Parameters
- Description：IC BUFFER INVERT 5.5V 20DIP
- Series：74ALS
- Mfr：Texas Instruments
- Package：Bulk,Tube
- Logic Type：Buffer, Inverting
- Number of Elements：2
- Number of Bits per Element：4
- Input Type：-
- Output Type：3-State
- Current - Output High, Low：15mA, 48mA
- Voltage - Supply：4.5V ~ 5.5V
- Operating Temperature：0°C ~ 70°C (TA)
- Mounting Type：Through Hole
- Package / Case：20-DIP (0.300", 7.62mm)
- Supplier Device Package：20-PDIP
- Grade：-
- Qualification：-
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Overview
The SN74ALS240A-1N is a dual four-bit buffer and line driver from the Texas Instruments ALS series. It features inverted outputs with three-state capability controlled by low-active enable inputs. The device operates on a single 5 V supply, drawing a maximum quiescent current of 25 mA. It exhibits a typical propagation delay of 9 ns at nominal supply voltage. The component is housed in a 20-pin plastic LDCC package and supports a maximum low-level output current of 48 mA.
Feature Summary
- Provides dual independent four-bit buffering for signal inversion and line driving applications.
- Features three-state outputs to isolate bus lines when disabled.
- Utilizes low-power Schottky (ALS) technology for reduced power consumption.
Applications
- Memory address drivers
- Clock drivers
- Bus-oriented architectures
Procurement Notes
Verify the specific suffix '1' against the manufacturer datasheet to confirm pinout compatibility and electrical characteristics. Ensure the selected package variant matches the required PCB footprint. Confirm RoHS compliance status as it varies by manufacturing date code. Validate that the operating temperature range meets system requirements.
Selection Notes
Select this component for designs requiring high-speed logic interfacing with moderate drive strength. The ALS family offers a balance between speed and power dissipation compared to standard TTL or LS families. Consider the 20-pin LDCC package constraints during layout planning. Verify input voltage levels are compatible with the driving source logic family.
Part Context
This part belongs to the SN74ALS240A family of octal buffers and line drivers. It is functionally similar to the SN74ALS240AN but may differ in package type or specific electrical testing parameters defined by the manufacturer's suffix codes. It serves as a legacy solution for 5V logic systems requiring bus isolation.
Replacement Considerations
SN74ALS240AN
FAQ
What is the logic polarity of the SN74ALS240A-1N?
The device provides inverted outputs, meaning the output state is the logical complement of the input state.
How is the three-state operation controlled?
The outputs are placed in a high-impedance state when the low-active enable inputs are asserted high.
