S-19100N12H-M5T2U Datasheet, PDF (26/45 Pages) Seiko Instruments Inc – BUILT-IN DELAY CIRCUIT

FOR AUTOMOTIVE 105°C OPERATION VOLTAGE DETECTOR BUILT-IN DELAY CIRCUIT (EXTERNAL DELAY TIME SETTING)
S-19100xxxH Series
Rev.2.0_01
2. Power-on reset circuit (Nch open-drain output product only)
A power-on reset circuit can be constructed using the S-19100NxxH Series.
VDD
R_A^*1
(R_A ≤ 100 kΩ)
Di^*2
VIN
C
R
100 kΩ
S-19100N
OUT
(Nch open-drain output product)
VSS
*1. RA should be 100 kΩ or less to prevent oscillation.
*2. Diode (Di) instantaneously discharges the charge stored in the capacitor (C) at the power falling. Di can be
removed when the delay of the falling time is not important.
Figure 28
V_DD
OUT
[V]
[V]
t [s]
t [s]
Figure 29
Remark
When the power rises sharply, the output may instantaneously be set to the "H" level due to the IC’s
indefinite area (the output voltage is indefinite when it is the IC’s minimum operation voltage or less),
as seen in Figure 30.
V_DD
OUT
[V]
[V]
t [s]
t [s]
Figure 30
Caution 1. The above connection diagram and constant will not guarantee successful operation.
Perform thorough evaluation using the actual application to set the constant.
2. Note that the hysteresis width may be larger as the following equation shows when using the
above connection. Perform thorough evaluation using the actual application to set the
constant.
Maximum hysteresis width = VHYS + RA • 20 μA
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