美国达拉斯半导体微处理器监选择指南-Dallas Semic

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.

IntroductionSelecting 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. BackgroundMicroprocessor 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 TableTable 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 HyperlinksOnce 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   5.0 Volt Operation 3.3 Volt Operation 2.5 Volt Operation Pushbutton Reset Referenced Comparator Watchdog Timer Active High Reset Active Low Reset Package Type
DS1231 5%
10%         500ms 500ms 8-pin DIP, 16-pin SOIC DS1232 5%
10%       150ms
600ms
1200ms 610ms 610ms 8-pin DIP, 16-pin SOIC DS1232LP 5%
10%       150ms
600ms
1200ms 610ms 610ms 8-pin DIP, 8-pin SOIC, 16-pin SOIC, 8-pin uSOP, Flip Chip DS1233 5%
10%
15%           350ms TO-92, 4-pin SOT-223 DS1233A   10%
15%         350ms TO-92, 4-pin SOT-223 DS1233D 5%
10%
15%             350ms TO-92, 4-pin SOT-223 DS1233M 5%
10% 15%           350ms TO-92, 8-pin SOIC DS1705 5%     1600ms   205ms 8-pin DIP, 8-pin SOIC, 8-pin uSOP DS1706 10%     1600ms   205ms 8-pin DIP, 8-pin SOIC, 8-pin uSOP DS1706L 5%     1600ms 205ms   8-pin DIP, 8-pin SOIC, 8-pin uSOP DS1706P   20%   1600ms 205ms   8-pin DIP, 8-pin SOIC, 8-pin uSOP DS1706R   20%   1600ms   205ms 8-pin DIP, 8-pin SOIC, 8-pin uSOP DS1706S   10%   1600ms   205ms 8-pin DIP, 8-pin SOIC, 8-pin uSOP DS1706T   5%   1600ms   205ms 8-pin DIP, 8-pin SOIC, 8-pin uSOP DS1707 5%       205ms 205ms 8-pin DIP, 8-pin SOIC, 8-pin uSOP DS1708 10%       205ms 205ms 8-pin DIP, 8-pin SOIC, 8-pin uSOP DS1708R   20%     205ms 205ms 8-pin DIP, 8-pin SOIC, 8-pin uSOP DS1708S   10%     205ms 205ms 8-pin DIP, 8-pin SOIC, 8-pin uSOP DS1708T   5%     205ms 205ms 8-pin DIP, 8-pin SOIC, 8-pin uSOP DS1810 5%
10%
15%             150ms TO-92, 3-pin SOT-23, Flip Chip DS1811 5%
10%
15%             150ms TO-92, 3-pin SOT-23, Flip Chip DS1812 5%
10%
15%           150ms   TO-92, 3-pin SOT-23, Flip Chip DS1813 5%
10%
15%           150ms TO-92, 3-pin SOT-23, Flip Chip DS1814A 5%
10%       1600ms   200ms 5-pin SOT-23-5 DS1814B 5%
10%         1600ms 200ms 200ms 5-pin SOT-23-5, Flip Chip DS1814C 5%
10%         200ms 200ms 5-pin SOT-23-5, Flip Chip DS1815   5%
10%
20%           150ms TO-92, 3-pin SOT-23 DS1816   5%
10%
20%           150ms TO-92, 3-pin SOT-23 DS1817   5%
10%
20%         150ms   TO-92, 3-pin SOT-23 DS1818   5%
10%
20%         150ms TO-92, 3-pin SOT-23 DS1819A   5%
10%
20%     1600ms   200ms 5-pin SOT-23-5, Flip Chip DS1819B   5%
10%
20%       1600ms 200ms 200ms 5-pin SOT-23-5 DS1819C   5%
10%
20%       200ms 200ms 5-pin SOT-23-5 DS1830 5%
10%
15%           50ms
100ms
250ms 8-pin DIP, 8-pin SOIC, 8-pin uSOP DS1830A   5%
10%
20%         50ms
100ms
250ms 8-pin DIP, 8-pin SOIC, 8-pin uSOP DS1831 5%
10%
15% 5%
10%
20%   2     16ms
160ms
1600ms 16-pin DIP, 16-pin SOIC DS1831A 5%
10%
15% 5%
10%
20%   16ms
160ms
1600ms   16ms
160ms
1600ms 16-pin DIP, 16-pin SOIC DS1831B 5%
10%
15% 5%
10%
20%   2     16ms
160ms
1600ms 16-pin DIP, 16-pin SOIC DS1831C   5%
10%
20% 5%
10%
15% 2     16ms
160ms
1600ms 16-pin DIP, 16-pin SOIC DS1831D   5%
10%
20% 5%
10%
15% 16ms
160ms
1600ms   16ms
160ms
1600ms 16-pin DIP, 16-pin SOIC DS1831E   5%
10%
20% 5%
10%
15% 2     16ms
160ms
1600ms 16-pin DIP, 16-pin SOIC DS1832   10%
20%     150ms
600ms
1200ms 610ms 610ms 8-pin DIP, 8-pin SOIC, 8-pin uSOP DS1833 5%
10%
15%           350ms   TO-92,4-pin SOT-223 DS1834 5%
10% 10%
20%         350ms 8-pin DIP, 8-pin SOIC, 8-pin uSOP, Flip Chip DS1834A 5%
10% 10%
20%         350ms 8-pin DIP, 8-pin SOIC, 8-pin uSOP, Flip Chip DS1834D 5%
10% 10%
20%       350ms   8-pin DIP, 8-pin SOIC, 8-pin uSOP
Questions/comments/suggestions concerning this application note can be sent t MixedSignal.Apps@dalsemi.com

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