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STM690/704/795/802/804/805/806
4/32
SUMMARY DESCRIPTION
The STM690/704/795/802/804/805/806 Supervi-
sors are self-contained devices which provide mi-
croprocessor supervisory functions with the ability
to
non-volatize
and
write-protect
external
LPSRAM. A precision voltage reference and com-
parator monitors the VCC input for an out-of-toler-
ance condition. When an invalid VCC 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 2. Logic Diagram (STM690/802/804/805)
Note: 1. For STM804/805, reset output is active-high and open
drain.
Figure 3. Logic Diagram (STM704/806)
Figure 4. Logic Diagram (STM795)
Table 2. Signal Names
Note: 1. Open drain for STM804/805 only.
2. STM795
AI08846
VCC VBAT
STM690/
802/804/
805
VSS
VOUT
RST(RST)(1)
WDI
PFI
PFO
AI08847
VCC VBAT
STM704
STM806
VSS
VOUT
RST
MR
PFI
PFO
MR
Push-button Reset Input
WDI
Watchdog Input
RST
Active-Low Reset Output
RST(1)
Active-High Reset Output
E(2)
Chip Enable Input
ECON
(2)
Conditioned Chip Enable Output
Vccsw(2)
VCC Switch Output
VOUT
Supply Voltage Output
VCC
Supply Voltage
VBAT
Back-up Supply Voltage
PFI
Power-fail Input
PFO
Power-fail Output
VSS
Ground
AI08848
VCC VBAT
STM795
VSS
VOUT
RST
VCCSW
E
ECON


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