ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR

S-1000 Series

Seiko Instruments Inc.

21

Output voltage

Input voltagae

1

μs

1

μs

× 10%

× 90%

Figure 22 Measurement condition for response time

OUT

VSS

VDD

S-1000

Series

V

R

*1

100 k

Ω

V

*1.

R is unnecessary for CMOS output products.

Figure 23 Measurement circuit 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.

VSS

VDD

Microcomputer

S-1000C

VSS

(Only for Nch open-drain products)

VDD1

VDD2

Microcomputer

S-1000N

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.