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Product Detailed Parameters
- Description：IC GATE AND 2CH 4-INP 14DIP
- Series：74AS
- Mfr：Texas Instruments
- Package：Bulk,Tube
- Logic Type：AND Gate
- Number of Circuits：2
- Number of Inputs：4
- Features：-
- Voltage - Supply：4.5V ~ 5.5V
- Current - Quiescent (Max)：-
- Current - Output High, Low：2mA, 20mA
- Input Logic Level - Low：0.8V
- Input Logic Level - High：2V
- Max Propagation Delay @ V, Max CL：6ns @ 5V, 50pF
- Operating Temperature：0°C ~ 70°C
- Mounting Type：Through Hole
- Supplier Device Package：14-PDIP
- Package / Case：14-DIP (0.300", 7.62mm)
- Grade：-
- Qualification：-
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Overview
The SN74AS21N is a dual 4-input positive-AND gate from Texas Instruments' Advanced Schottky (AS) logic family. It operates within a supply voltage range of 4.5 V to 5.5 V. The device features a propagation delay time of 6 ns and provides a high-level output current of -2 mA. Packaged in a 14-pin PDIP format, it supports through-hole mounting and functions as a single-function logic gate.
Feature Summary
- Implements dual independent 4-input AND logic operations
- Utilizes Advanced Schottky technology for high-speed performance
- Provides standard TTL-compatible input and output characteristics
Applications
- Digital logic circuit design requiring fast switching speeds
- Data processing systems utilizing TTL interfaces
- Control logic implementations in industrial equipment
Procurement Notes
Verify the component matches the specific SN74AS21N designation rather than generic variants. Confirm the package type is 14-PDIP and the manufacturer is Texas Instruments. Ensure the datasheet confirms the 6 ns propagation delay and AS series classification. Check RoHS compliance status if required by project specifications. Validate that the unit is new or appropriately graded for the intended application.
Selection Notes
Select this component when advanced Schottky speed is required for dual 4-input AND operations. It serves as a suitable replacement for slower standard 74-series gates where timing constraints are critical. Consider the 14-PDIP package for through-hole assembly requirements. Evaluate the 4.5 V to 5.5 V operating range against system power supplies. Compare performance metrics against other AS-family devices for compatibility.
Part Context
This part belongs to the Texas Instruments SN74AS series, which represents an advancement over standard 74LS logic in terms of speed. The SN74AS21N specifically addresses applications needing multiple complex AND functions within a single integrated circuit. It is distinct from flip-flop or counter variants within the same broader logic family.
Replacement Considerations
Compatible substitutes include other SN74AS21 variants with different suffixes indicating package or temperature variations, provided the electrical characteristics remain identical. Verify pinout compatibility before substitution.
