S807 Series Seiko Instruments, Inc., S807 Series Datasheet - Page 26

• Manufacturer Part Number: S807 Series
• Description: Series High-Precision Voltage Detector
• Manufacturer: Seiko Instruments, Inc.

5. Oscillation
In applications where a resistor is connected to the voltage detector input (Figure 11 and 12), the through-type current
generated when the output goes from low to high (release) causes a voltage drop equal to [through-type current] [input
resistance] across the resistor. When the input voltage resultantly drops below the detection voltage -V
voltage returns to its low level. In this state, the through-type current -- and its resultant voltage drop -- have disappeared,
and the output goes back from low to high. Again, a through-type current is generated, a voltage drop appears, and the
process repeats. Oscillation refers to this unstable condition
V
V
DD
SS
Power reset mis-implementation
C
R
V
IN
Di
Figure 11
S-
807XXAL
/SL
(CMOS output)
Seiko Instruments Inc.
OUT
.
HIGH-PRECISION VOLTAGE DETECTOR
V
V
DD
SS
Mis-implementation with input voltage
divider
RA
RB
V
IN
Figure 12
S-
807XXAL
/SL
(CMOS output)
S-807 Series
DET
OUT
, the output
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