S-1000C20-M5T1G datasheet(13/38 Pages) SII

Part #	S-1000C20-M5T1G

Description	ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR

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Manufacturer	SII [Seiko Instruments Inc]

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13 / 38 page

ULTRA-SMALL PACKAGE HIGH-PRECISION VOLTAGE DETECTOR

Rev.2.3_00

S-1000 Series

Seiko Instruments Inc.

13

Operation

1. Basic operation: CMOS output (Active “L”)

(1)

When the power supply voltage (VDD) is higher than the release voltage (

+VDET), the Nch transistor is OFF and the

Pch transistor is ON to provide VDD (“H”) at the output. Since the Nch transistor N1 in Figure 14 is OFF, the

comparator input voltage is

C

B

A

DD

C

B

R

V

)

R

(

+

•

+

.

(2)

When the VDD goes below

+VDET, the output provides the VDD level, as long as the VDD remains above the detection

voltage

−VDET. When the VDD falls below −VDET (point A in Figure 15), the Nch transistor becomes ON, the Pch

transistor becomes OFF, and the VSS level appears at the output. At this time the Nch transistor N1 in Figure 14

becomes ON, the comparator input voltage is changed to

B

A

DD

B

R

V

R

+

•

.

(3)

When the VDD falls below the minimum operating voltage, the output becomes undefined, or goes to the VDD when the

output is pulled up to the VDD.

(4)

The VSS level appears when the VDD rises above the minimum operating voltage. The VSS level still appears even

when the VDD surpasses

−VDET, as long as it does not exceed the release voltage +VDET.

(5)

When the VDD rises above

+VDET (point B in Figure 15), the Nch transistor becomes OFF and the Pch transistor

becomes ON to provide VDD level at the output.

VREF

Pch

Nch

N1

RC

RB

RA

−

+

OUT

VSS

VDD

*1

*1.

Parasiteic diode

Figure 14 Operation 1

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S-1000C20-M5T1G Datasheet(PDF) 13 Page - Seiko Instruments Inc

S-1000C20-M5T1G Datasheet(HTML) 13 Page - Seiko Instruments Inc

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