S1002 datasheet(14/39 Pages) SII

14 / 39 page

VOLTAGE DETECTOR WITH SENSE PIN

S-1002 Series

Rev.1.1_00

Seiko Instruments Inc.



Explanation of Terms

1. Detection voltage (

−VDET)

The detection voltage is a voltage at which the output in Figure 18 or Figure 19 turns to "L". The detection voltage

varies slightly among products of the same specification. The variation of detection voltage between the specified

minimum (

−VDET min.) and the maximum (−VDET max.) is called the detection voltage range (Refer to Figure 16).

Example: In the S-1002Cx18, the detection voltage is either one in the range of 1.778 V

≤ −VDET ≤ 1.822 V.

This means that some S-1002Cx18 have

−VDET = 1.778 V and some have −VDET = 1.822 V.

2. Release voltage (

+VDET)

The release voltage is a voltage at which the output in Figure 18 or Figure 19 turns to "H". The release voltage

varies slightly among products of the same specification. The variation of release voltage between the specified

minimum (

+VDET min.) and the maximum (+VDET max.) is called the release voltage range (Refer to Figure 17). The

range is calculated from the actual detection voltage (

−VDET) of a product and is in the range of −VDET × 1.03 ≤

+VDET ≤ −VDET × 1.07.

Example: For the S-1002Cx18, the release voltage is either one in the range of 1.832 V

≤ +VDET ≤ 1.949 V.

This means that some S-1002Cx18 have

+VDET = 1.832 V and some have +VDET = 1.949 V.

VSENSE

−VDET min.

−VDET max.

VOUT

tDET

Detection voltage

range

VSENSE

+VDET min.

+VDET max.

VOUT

Release voltage

range

tRESET

Release voltage

Figure 16 Detection Voltage

Figure 17 Release Voltage

VDD

VSS

OUT

100 k

SENSE

VDD

VSS

OUT

SENSE

Figure 18 Test Circuit of Detection Voltage

Figure 19 Test Circuit of Detection Voltage

and Release Voltage

(Nch open-drain output product)

(CMOS output product)

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