AN1957 Datasheet, PDF (1/22 Pages) STMicroelectronics – Microprocessor Supervisor Functions

AN1957
APPLICATION NOTE
Microprocessor Supervisor Functions
Designers of microprocessor systems have to achieve high reliability, in the face of a large number of
threats to stability or even correct functioning (such as, voltage drops, glitches, long ramp-up times, pro-
grams stuck in endless loops, etc.).
Supervisor circuits, from STMicroelectronics, provide highly effective solutions for minimizing the risks of
system failure, and for ensuring the safe running of the system, at a low cost. The members of the ST
Supervisor family offer various combinations of functions.
This Application Note describes the main Supervisor functions and features, to help the user to under-
stand their principles and the advantages of using them, through the description of waveforms, recom-
mended values, and hardware hookup diagrams.
Overview of ST Supervisors
– Microprocessor Supervisors
STM705, STM706, STM706T/S/R, STM707, STM708, STM708T/S/R, STM813L, STM706P,
STM6321L/M, STM6321T/S/R, STM6821L/M, STM6821T/S/R, STM6823L/M, STM6823T/S/R,
STM6824L/M, STM6824T/S/R, STM6825L/M, STM6825T/S/R
– Microprocessor Supervisors with Switchover
M40SZ100W, M40Z111, M40Z300W, STM690A, STM692A, STM690T/S/R, STM802L/M, STM802T/
S/R, STM703, STM704, STM704T/S/R, STM806T/S/R, STM805L, STM805T/S/R, STM804T/S/R,
STM817L/M, STM818L/M, STM819L/M, STM795T/S/R
– TIMEKEEPER™ Supervisors
M41ST95W, M41ST87W, M41ST87Y, M41ST85W, M41ST85Y, M41T315V, M48T201V, M48T201Y,
M48T212V
This Application Note is dedicated to the Microprocessor Supervisor and Microprocessor Supervisor with
Switchover families.
March 2005
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