Datasheet

Description STM690A/692A/703/704/802/805/817/818/819
6/43 Doc ID 10522 Rev 10
1 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 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 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 1. Logic diagram (STM690A/692/802/805/817)
1. For STM805, reset output is active-high.
Figure 2. Logic diagram (STM703/704/819)
AI07894
V
CC
V
BAT
STM690A/
692A/802/
805/817
V
SS
V
OUT
RST(RST)
(1)
WDI
PFI
PFO
AI07895
V
CC
V
BAT
STM703/
704/819
V
SS
V
OUT
RST
MR
PFI
PFO