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STM703 Datasheet(PDF) 4 Page - STMicroelectronics

Part No. STM703
Description  5V Supervisor with Battery Switchover
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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STM703 Datasheet(HTML) 4 Page - STMicroelectronics

 
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STM690A/692A/703/704/802/805/817/818/819
4/37
SUMMARY DESCRIPTION
The
STM690A/692A/703/704/802/805/817/818/
819 Supervisors are self-contained devices which
provide microprocessor supervisory functions with
the ability to non-volatize and write-protect exter-
nal LPSRAM. A precision voltage reference and
comparator monitors the VCC input for an out-of-
tolerance condition. When an invalid VCC condi-
tion occurs, the reset output (RST) is forced low
(or high in the case of RST). These devices also
offer a watchdog timer (except for STM703/704/
819) as well as a power-fail comparator (except for
STM818) 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 (STM690A/692A/802/
805/817)
Note: 1. For STM805, reset output is active-high.
Figure 3. Logic Diagram (STM703/704/819)
Figure 4. Logic Diagram (STM818)
Table 2. Signal Names
Note: 1. STM818
AI07894
VCC VBAT
STM690A/
692A/802/
805/817
VSS
VOUT
RST(RST)(1)
WDI
PFI
PFO
AI07895
VCC VBAT
STM703/
704/819
VSS
VOUT
RST
MR
PFI
PFO
MR
Push-button Reset Input
WDI
Watchdog Input
RST
Active-Low Reset Output
RST
Active-High Reset Output
E(1)
Chip Enable Input
ECON
(1)
Conditioned Chip Enable Output
VOUT
Supply Voltage Output
VCC
Supply Voltage
VBAT
Back-up Supply Voltage
PFI
Power-fail Input
PFO
Power-fail Output
VSS
Ground
AI07896
VCC VBAT
STM818
VSS
VOUT
RST
WDI
E
ECON


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