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Product Detailed Parameters
- Description：PROTOTYPE
- Series：74ALS
- Mfr：Texas Instruments
- Package：Bulk
- 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, 24mA
- Voltage - Supply：4.5V ~ 5.5V
- Operating Temperature：0°C ~ 70°C (TA)
- Mounting Type：Surface Mount
- Package / Case：20-SSOP (0.209", 5.30mm Width)
- Supplier Device Package：20-SSOP
- Grade：-
- Qualification：-
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Overview
The SN74ALS240ADB is an octal buffer and driver featuring three-state outputs, manufactured by Texas Instruments. It belongs to the ALS logic series and utilizes a 20-pin SSOP package. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a commercial temperature range from 0°C to 70°C. Key electrical characteristics include a high-level output current of -15 mA and a low-level output current of 24 mA (or 48 mA for the -1 version). Propagation delays are specified with maximum values up to 9 ns.
Feature Summary
- Provides eight inverting buffers or drivers with three-state outputs suitable for bus-oriented applications.
- Features pnp inputs that reduce DC loading on driving circuits.
- Designed to improve performance and density in memory address drivers and clock drivers.
Applications
- Memory address drivers
- Clock drivers
- Bus-oriented receivers and transmitters
Procurement Notes
Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and tape-and-reel specifications. Confirm RoHS compliance status and lead finish details directly from the latest Package Option Addendum before procurement. Ensure the selected variant matches the required operating temperature range and output drive capabilities for the target application.
Selection Notes
Select this component when designing systems requiring octal buffering with three-state control and reduced DC loading. Consider the ALS logic family characteristics regarding propagation delay and power consumption relative to system requirements. Verify compatibility with existing logic families and ensure the chosen package variant meets PCB layout constraints.
Part Context
This part is part of the SN54ALS240A, SN54AS240A, SN74ALS240A, and SN74AS240A family of octal buffers/drivers with three-state outputs. The SN74ALS240A variant is specifically designed for commercial temperature ranges and standard industrial applications, offering a balance of speed and power efficiency within the ALS logic family.
Replacement Considerations
SN74ALS240ADW
FAQ
What is the function of the OE inputs?
The OE (Output Enable) inputs control the three-state outputs. When active low, the outputs follow the inputs; when high, the outputs enter a high-impedance state.
Does the SN74ALS240A have a -1 version?
Yes, the SN74ALS240A-1 version exists and is identical to the standard version except that its recommended maximum IOL is 48 mA.
