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Product Detailed Parameters
- Description：IC GATE AND 2CH 4-INP 14SOIC
- 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：Surface Mount
- Supplier Device Package：14-SOIC
- Package / Case：14-SOIC (0.154", 3.90mm Width)
- Grade：-
- Qualification：-
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Overview
The SN74AS21D is a dual four-input AND gate integrated circuit manufactured by Texas Instruments. It belongs to the AS-TTL logic family and operates with a nominal supply voltage of 5 V within a range of 4.5 V to 5.5 V. The device features push-pull outputs and is housed in a 14-pin plastic dual in-line package (PDIP). Designed for commercial temperature applications, it supports operation between 0 °C and 70 °C. The component utilizes bipolar technology and provides high-speed performance characteristics typical of the Advanced Schottky series.
Feature Summary
- Dual four-input AND logic function
- Advanced Schottky TTL technology for high speed
- Push-pull output configuration
Applications
- Digital logic circuits requiring dual four-input AND operations
- Data processing systems utilizing AS-TTL families
- Commercial electronic equipment operating at standard logic levels
Procurement Notes
Verify the specific manufacturer source and RoHS compliance status before procurement, as documentation indicates non-compliance in some records. Confirm the package type matches the required DIP-14 form factor. Ensure the supply voltage requirements align with the 4.5 V to 5.5 V operational range specified for this AS-TTL component.
Selection Notes
Select this component when a dual four-input AND gate is required within an AS-TTL system architecture. It serves as a direct replacement for other SN74AS21 variants differing only in package style, such as SOIC or CDIP versions. Consider the commercial temperature range and 5 V supply constraints during circuit design integration.
Part Context
This part is a member of the Texas Instruments SN74AS series, which represents Advanced Schottky TTL logic. The series is characterized by high switching speeds and reduced power dissipation compared to standard TTL. The SN74AS21 specifically provides two independent AND gates, each with four inputs, facilitating complex logic combinations in digital designs.
Replacement Considerations
Compatible substitutes include SN74AS21N, SN74AS21J, and SN74AS21M, which offer identical logical functionality but differ in package types such as ceramic DIP, J-Lead, or surface-mount options.
