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Product Detailed Parameters
- Description：IC GATE NOR PQCC20
- 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 SN74ALS27FN is a triple 3-input positive NOR gate from the Texas Instruments ALS logic series. It operates within a supply voltage range of 4.5 V to 5.5 V and features a propagation delay of 15 ns. The device provides a low-level output current of 8 mA and a high-level output current of -400 uA. It is housed in a 20-pin Plastic Quad Flatpack (PQFP) package, suitable for surface-mount applications across an operating temperature range of 0°C to +70°C.
Feature Summary
- Integrates three independent 3-input NOR gates within a single integrated circuit
- Utilizes Advanced Low-power Schottky technology for optimized speed and power consumption
- Provides standardized TTL-compatible input and output voltage levels
Applications
- Digital logic circuit design requiring multi-input NOR functionality
- Microprocessor system interface circuits
- General-purpose computing and control systems
Procurement Notes
Verify the specific package designation PQCC20 or PQFP-20 against your PCB footprint requirements. Confirm that the manufacturer datasheet specifies the exact pinout configuration for this quad flatpack variant. Ensure the ordering suffix matches the required tape-and-reel or bulk packaging format if applicable. Cross-reference the RoHS compliance status with current environmental regulations before finalizing procurement.
Selection Notes
Select this component when a compact solution for multiple 3-input NOR operations is required in surface-mount designs. The ALS series offers a favorable balance between switching speed and power dissipation compared to standard LS logic. Consider the 20-pin package constraints relative to available board space and thermal management capabilities during the initial schematic capture phase.
Part Context
This part belongs to the SN74ALS27A family of logic gates manufactured by Texas Instruments. It serves as a digital logic building block within the broader 74-series ecosystem. The ALS technology represents an advancement over earlier bipolar logic families, providing improved performance metrics while maintaining compatibility with existing TTL-based system architectures.
Replacement Considerations
Direct substitutes include other SN74ALS27 variants in different packages, such as SN74ALS27N in DIP-14 or SN74ALS27DR in SOIC-14. Verify pin compatibility carefully due to the difference between the 20-pin PQFP and 14-pin packages. Alternative logic families like SN74LS27 may offer functional equivalence but with slower switching speeds.
