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Contents

1. Introduction.............................................................................................................................................................. 5

1.1 RESET Circuits............................................................................................................................................... 5

2. The Behavior of Power Supplies............................................................................................................................ 6

2.1 Line Operated Power Supplies....................................................................................................................... 6

2.2 Battery Operated Power Supplies .................................................................................................................. 8

3. Circuit Description .................................................................................................................................................. 9

4. The Behavior of Digital Circuits ........................................................................................................................... 17

5. Examples of Applications..................................................................................................................................... 18

5.1 Voltage Monitoring ....................................................................................................................................... 18

5.2 Applications in Systems................................................................................................................................ 23

5.3 Application Hints........................................................................................................................................... 23

6. Summary ................................................................................................................................................................ 26

6.1 Design Check List ........................................................................................................................................ 26

6.2 Comparison of the Bipolar and BiCMOS Versions ....................................................................................... 27