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Product Detailed Parameters
- Description：IC GATE AND 2CH 4-INP 14SOIC
- Series：74AS
- Mfr：Texas Instruments
- Package：Tape & Reel (TR),Bulk
- 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 SN74AS21DR is a dual 4-input positive AND gate integrated circuit manufactured by Texas Instruments. It belongs to the AS-TTL logic family and operates within a supply voltage range of 4.5 V to 5.5 V. The device features a propagation delay of 5.5 ns, with a low-level output current capability of 20 mA and a high-level output current of -2 mA. It is housed in a 14-pin SOIC package and supports surface-mount installation. The component functions reliably across an operating temperature range from 0 °C to +70 °C.
Feature Summary
- Provides two independent 4-input AND logic gates within a single compact package
- Delivers high-speed performance with a propagation delay of 5.5 ns
- Offers robust drive strength with a low-level output current of 20 mA
Applications
- High-speed digital logic circuits requiring fast switching times
- Data acquisition systems utilizing TTL-compatible interfaces
- Process control modules implementing parallel input logic operations
Procurement Notes
Verify that the specific part number matches the required AS-TTL series specifications. Confirm the package type corresponds to the design layout requirements. Ensure the operating temperature range aligns with the intended application environment. Check for RoHS compliance status if environmental regulations apply to the final product assembly.
Selection Notes
Select this component when high-speed logic processing is necessary compared to standard TTL variants. Consider the 20 mA sink current capability for driving moderate loads directly. Evaluate the SOIC-14 footprint against available board space constraints. Compare power consumption characteristics against other logic families for efficiency optimization.
Part Context
This device is part of the Texas Instruments SN74AS series, designed for applications demanding faster operation than standard 74LS logic. The AS-TTL family utilizes advanced Schottky technology to reduce propagation delays while maintaining compatibility with existing TTL voltage levels. This specific model provides dual 4-input functionality in a surface-mount format suitable for modern PCB designs.
Replacement Considerations
The SN74AS21D is a verified pin-to-pin substitute offering identical electrical characteristics in a PDIP package. Designers should verify package dimensions and thermal properties when transitioning between SOIC and DIP formats.
