Abstract: This application note provides a quick guide to selecting Dallas Semiconductor Microprocessor Supervisor ICs. Many customers searching for a microprocessor supervisor have requested a simpler alternative to the Maxim online parametric search. This application note was created as an easy-to-use selection guide for the Dallas Semiconductor Microprocessor Supervisor product family. The goal was to allow an engineer to quickly narrow down available options for the right microprocessor supervisor IC for their application.
Introduction
Selecting a microprocessor supervisor can be complicated by the number of parts available. The parametric search on the Maxim/Dallas website lets you narrow the choice down but it can take a while! Customers have asked for a guide to simplify the process.
This application note provides a guide for quickly selecting Dallas Semiconductor Microprocessor Supervisor ICs. The goal is to allow an engineer to quickly narrow down available options for the right microprocessor supervisor IC for their application.
Background
Microprocessor Supervisors monitor supply voltages and apply resets when the monitored voltage falls out of tolerance. Some supervisors provide a means to manually reset a circuit through a pushbutton interface. Others have referenced comparators for monitoring voltages other than the supply voltage. Various reset times and tolerances are available. Watchdog timing functions, which monitor the microprocessor for activity, are implemented in some devices. Resets are available with active high and active low outputs.
Supervisor Reference Table
Table 1 is designed to allow the engineer to make a quick decision on a microprocessor supervisor device. Basic selection criteria include supply voltage, voltage tolerance, type of reset(s), and package type, as well as the options for pushbutton reset, watchdog timer, and referenced comparators.
Quickview Hyperlinks
Once a device is chosen from the above table, clicking the associated hyperlink will open the QuickView Datasheet from the Maxim home page (www.maxim-ic.com) for that particular device. In the QuickView page, the device description, key features, and ordering information are displayed. Datasheet specifications, applications notes, and mechanical drawings can be downloaded from this page as well.
For details on the specific part numbers for the chosen device, please use the following link: www.maxim-ic.com/design/packaging/dallas_ordering_information.cfm Enter the base part number (for example DS1232) into the 'Part Search' field. Click the 'Go' button and a list of all valid ordering numbers for that IC, as well as some details such as package type, operating temperature and voltage tolerance, will be listed.
Table 1. Microprocessor Supervisor IC Selection Guide
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