Datasheet

Description STM690, STM704, STM795, STM802, STM804, STM805, STM806
6/42 Doc ID 10519 Rev 9
1 Description
The STM690/704/795/802/804/805/806 supervisors are self-contained devices which
provide microprocessor supervisory functions with the ability to non-volatize and write-
protect external LPSRAM. A precision voltage reference and comparator monitors the V
CC
input for an out-of-tolerance condition. When an invalid V
CC
condition occurs, the reset
output (RST
) is forced low (or high in the case of RST). These devices also offer a watchdog
timer (except for STM704/795/806) as well as a power-fail comparator (except for STM795)
to provide the system with an early warning of impending power failure.
These devices are available in a standard 8-pin SOIC package or a space-saving 8-pin
TSSOP package.
Figure 1. Logic diagram (STM690/802/804/805)
1. For STM804/805, reset output is active-high and open drain.
Figure 2. Logic diagram (STM704/806)
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V
CC
V
BAT
STM690/
802/804/
805
V
SS
V
OUT
RST (RST)
(1)
WDI
PFI
PFO
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V
CC
V
BAT
STM704
STM806
V
SS
V
OUT
RST
MR
PFI
PFO