STM804 STMICROELECTRONICS [STMicroelectronics], STM804 Datasheet - Page 4

• Manufacturer Part Number: STM804
• Description: 3V Supervisor with Battery Switchover
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

STM690/704/795/802/804/805/806
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
LPSRAM. A precision voltage reference and com-
parator monitors the V
ance condition. When an invalid V
occurs, the reset output (RST) is forced low (or
high in the case of RST). These devices also offer
Figure 2. Logic Diagram (STM690/802/804/805)
Note: 1. For STM804/805, reset output is active-high and open
Figure 3. Logic Diagram (STM704/806)
4/31
WDI
PFI
non-volatize
drain.
MR
PFI
V
STM690/
802/804/
CC
V
805
V
and
STM704
STM806
CC
SS
V
V
CC
BAT
SS
V
input for an out-of-toler-
BAT
write-protect
V
RST(RST)
PFO
OUT
CC
AI08846
V
RST
PFO
AI08847
OUT
condition
external
(1)
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 4. Logic Diagram (STM795)
Table 2. Signal Names
Note: 1. Open drain for STM804/805 only.
Vccsw
E
V
RST
V
CON
V
PFO
WDI
RST
V
2. STM795
E
V
CCSW
MR
PFI
OUT
BAT
CC
SS
(2)
(1)
(2)
(2)
E
Push-button Reset Input
Watchdog Input
Active-Low Reset Output
Active-High Reset Output
Chip Enable Input
Conditioned Chip Enable Output
V
Supply Voltage Output
Supply Voltage
Back-up Supply Voltage
Power-fail Input
Power-fail Output
Ground
CC
V
Switch Output
STM795
CC
V
SS
V
BAT
V
RST
E
AI08848
OUT
CON