SN74F521NSR Integrated Circuits (ICs)

Introduction

The SN74F521NSR is a logic device which contains two comparators with open-collector outputs designed for use in TTL and CMOS digital systems. It has a large number of features that make it suitable for a wide range of applications as explained in further detail below.

Application Field

The SN74F521NSR can be used in logic applications such as signal conditioning, voltage or current regulation, or digital signal processing. It can also be used as a level detector application due to its wide supply range of 4.5V to 18V. The devices open collector outputs allow it to be interfaced directly with low voltage open drain devices such as FET drivers and buffers. The SN74F521NSR can also be used in an embedded system connected to a controller to detect changes in analog signals.

Working Principle

The SN74F521NSR operates as a two-input comparator which provides two open-collector outputs. Each output generates a logic signal with respect to two threshold voltage levels. When the applied voltage is greater than the upper threshold voltage, the output will generate a low state output. Likewise, when the applied voltage is lower than the lower threshold voltage, the output will generate a high state output. The upper and lower threshold voltages can be adjusted using external reference and feedback ports respectively. The SN74F521NSR also features a power on reset circuit which allows the device to start up in a known state without external control.

Pin Configuration

The SN74F521NSR is available in a 14-pin dual in-line configuration. Pin 1 is the negative supply and pin 10 is the positive supply. Pins 6 and 8 are the comparator inputs. Pins 12 and 14 are the open-collector outputs. Pins 13 and 15 are the feedback for setting the thresholds. Pins 2 and 8 are the reference inputs.

Features

• Wide supply range of 4.5V to 18V
• Two open-collector outputs
• Low Offset Voltage
• Low input bias current
• Power on reset circuit
• High input impedance

Conclusion

The SN74F521NSR is a logic device designed for use in TTL and CMOS digital systems. It is ideal for applications such as signal conditioning, voltage or current regulation, digital signal processing, and level detection. It features two open-collector outputs and its threshold voltages can be adjusted using external reference and feedback ports. It is available in a 14-pin dual in-line configuration and is suitable for a wide range of applications.