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Product Detailed Parameters
- Description：IC GATE NOR
- Series：*
- Mfr：Texas Instruments
- Package：Bulk
- Logic Type：-
- Number of Circuits：-
- Number of Inputs：-
- Features：-
- Voltage - Supply：-
- Current - Quiescent (Max)：-
- Current - Output High, Low：-
- Input Logic Level - Low：-
- Input Logic Level - High：-
- Max Propagation Delay @ V, Max CL：-
- Operating Temperature：-
- Mounting Type：-
- Supplier Device Package：-
- Package / Case：-
- Grade：-
- Qualification：-
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Overview
The SN74ALS1805AN is a hex dual-input NOR gate integrated circuit manufactured by Texas Instruments. It belongs to the Advanced Low-power Schottky (ALS) logic series and utilizes a 20-pin Plastic Dual In-line Package (PDIP). 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 propagation delay of 15 ns, a low-level output current capability of 8 mA, and a high-level output current of -400 µA. It contains six independent logic circuits with two inputs each.
Feature Summary
- Hex configuration providing six independent dual-input NOR logic functions within a single package.
- Advanced Low-power Schottky (ALS) technology ensures faster switching speeds compared to standard LS logic while maintaining low power consumption.
- Robust TTL-compatible input structure allows direct interfacing with other TTL devices without additional buffering.
Applications
- Digital logic control systems requiring multiple NOR operations
- Address decoding circuits in microprocessor-based designs
- General-purpose boolean logic implementation in industrial equipment
Procurement Notes
Verify the specific suffix 'AN' confirms the PDIP-20 through-hole package variant. Confirm RoHS compliance status as some ALS variants may be non-compliant or end-of-life. Check for obsolescence notices on the manufacturer website before finalizing procurement plans.
Selection Notes
Select this component when a design requires multiple NOR gates in a DIP format. Ensure the PCB layout accommodates the 20-pin DIP footprint. Verify that the 4.5V to 5.5V operating voltage aligns with the system's power rail specifications.
Part Context
This part is part of the SN74ALS family, designed to offer improved speed-to-power product over previous generations. It serves as a digital logic building block for complex combinational circuits. The ALS series was widely used in the 1980s and 1990s for high-performance digital systems.
Replacement Considerations
SN74LS1805N: Standard LS series alternative with slower speed but similar pinout. SN74ALS1805D: Same logic function in SOIC-20 surface mount package. SN74HC1805N: High-speed CMOS alternative with wider voltage range but different drive characteristics.
