SN74ALS27ANS

Overview

The SN74ALS27AN is a catalog logic device containing three independent 3-input positive-NOR gates. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating free-air temperature range from 0°C to 70°C. The component utilizes bipolar technology with push-pull outputs, providing a low-level output current capability of up to 8 mA and a high-level output current of -0.4 mA. Propagation delay characteristics include a maximum tPLH of 15 ns and a maximum tPHL of 9 ns under standard test conditions.

Feature Summary

• Contains three independent 3-input positive-NOR gates for Boolean logic operations
• Features push-pull outputs capable of sourcing and sinking specified currents
• Operates on standard 5-Volt logic levels with defined input thresholds

Applications

• General-purpose digital logic circuit design
• Implementation of Boolean NOR functions in industrial control systems
• Signal processing within commercial electronic equipment

Procurement Notes

Verify the specific ordering suffix 'N' corresponds to the Plastic Dual In-Line (PDIP) package configuration. Confirm that the required operating environment falls within the 0°C to 70°C commercial temperature rating. Ensure the application voltage remains strictly between 4.5 V and 5.5 V to maintain electrical specifications. Check for RoHS compliance status if environmental regulations apply to the manufacturing process.

Selection Notes

Select this component when three separate 3-input NOR functions are required in a single integrated circuit. The ALS series offers faster switching speeds compared to standard LS logic while maintaining lower power consumption than AS series devices. Verify that the PDIP-14 through-hole package aligns with the target printed circuit board layout and assembly requirements.

Part Context

This device belongs to the Texas Instruments SN74ALS27A family of single-function gates. It serves as the commercial-grade counterpart to the military-rated SN54ALS27A, which supports extended temperature ranges. The part is categorized under standard TTL-compatible logic ICs designed for general-purpose applications requiring reliable boolean logic processing.

Replacement Considerations

SN74ALS27AD (SOIC Package)

FAQ

What is the maximum propagation delay for this device?

The maximum propagation delay time (tPLH) is 15 ns, and the maximum propagation delay time (tPHL) is 9 ns when tested at VCC = 5 V with a load capacitance of 50 pF.

Does the SN74ALS27AN support Schmitt trigger inputs?

No, the datasheet specifies that the device does not feature Schmitt trigger inputs; it relies on standard TTL-compatible input voltage thresholds.