ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR
S-1000 Series
Rev.2.3_00
1 µs
1 µs
R*1
100 kΩ
VDD
S-1000
Series
VIH
VDD
OUT
COUT
Input voltagae
V
VSS
V
VIL
tPLH
tPHL
VDD
V
DD × 90%
*1. R is unnecessary for CMOS output products.
Output voltage
Figure 23 Measurement circuit for response time
V
DD × 10%
V
IH = 5.5 V, VIL = 0.95 V
Figure 22 Measurement condition for response time
Caution The above connection diagram and constants do not guarantee correct operation. Perform sufficient
evaluation using the actual application to set the constants.
Application Circuit Examples
1. Microcomputer reset circuits
If the power supply voltage to a microcomputer falls below the specified level, an unspecified operation may be
performed or the contents of the memory register may be lost. When power supply voltage returns to normal, the
microcomputer needs to be initialized before normal operations can be done.
Reset circuits protect microcomputers in the event of current being momentarily switched off or lowered.
Reset circuits shown in Figures 24, 25 can be easily constructed with the help of the S-1000 series, that has low
operating voltage, a high-precision detection voltage and hysteresis.
VDD1
VDD2
VDD
S-1000N
Microcomputer
Microcomputer
S-1000C
VSS
VSS
(Only for Nch open-drain products)
Figure 24 Reset circuit example(S-1000C)
Figure 25 Reset circuit example (S-1000N)
Caution The above connection diagram and constants do not guarantee correct operation. Perform sufficient
evaluation using the actual application to set the constants.
Seiko Instruments Inc.
21
SII [ SEIKO INSTRUMENTS INC ]
