S1410 datasheet(9/29 Pages) SII

9 / 29 page

LOW CURRENT CONSUMPTION WATCHDOG TIMER WITH RESET FUNCTION

Rev.1.0_01

S-1410/1411 Series

Seiko Instruments Inc.



Electrical Characteristics

Table 7

(WEN pin logic active "H" product, VDD = 5.0 V, Ta =

+25°C unless otherwise specified)

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Test

Circuit

Detection voltage

−VDET

−

−VDET(S)

× 0.985

−VDET(S)

× 1.015

Hysteresis width

VHYS

−

−VDET

× 0.03

−VDET

× 0.05

−VDET

× 0.07

Current consumption

during operation

ISS1

When watchdog timer operates

−

3.8

7.8

μA

Reset time-out period

tRST

CPOR = 2200 pF

8.7

14.5

Watchdog time-out period

tWDU

CWDT = 470 pF

24.6

Watchdog double pulse

detection time

tWDL

CWDT = 470 pF

461

769

1077

μs

Reset output voltage "H"

VROH

S-1411 Series A / B / C / D /

E / F type only

VDD

− 1.0

−

Reset output voltage "L"

VROL

−

0.4

Reset output pull-up current

IRUP

VRST

_______

= 0 V,

S-1411 Series A / B / C / D /

E / F type only

−

−0.85

−0.4

μA

Reset output current

IROUT

VDS = 0.4 V,

S-1411 Series

only

VDD = 1.5 V

0.6

1.1

−

VDD = 1.8 V

1.1

1.6

−

VDD = 2.5 V

2.1

2.6

−

VDD = 3.0 V

2.8

3.3

−

Reset output leakage current IRLEAK

VDS = 6.0 V, VDD = 6.0 V,

S-1411 Series only

−

0.096

μA

Watchdog output voltage "H" VWOH

A / B / C / D / E / F type only

VDD

− 1.0

−

Watchdog output voltage "L" VWOL

−

0.4

Watchdog output

pull-up current

IWUP

VWDO

________

= 0 V,

A / B / C / D / E / F type only

−

−0.85

−0.4

μA

Watchdog output current

IWOUT

VDS = 0.4 V

VDD = 1.5 V

0.6

1.1

−

VDD = 1.8 V

1.1

1.6

−

VDD = 2.5 V

2.1

2.6

−

VDD = 3.0 V

2.8

3.3

−

Watchdog output leakage

current

IWLEAK

VDS = 6.0 V, VDD = 6.0 V

−

0.096

μA

Input pin voltage 1 "H"

VSH1

WEN pin, WDI pin

0.7

× VDD

−

Input pin voltage 1 "L"

VSL1

WEN pin, WDI pin

−

0.3

× VDD

Input pin voltage 2 "H"

VSH2

___

/ T pin,

S-1410 Series only

0.7

× VDD

−

Input pin voltage 2 "L"

VSL2

___

/ T pin,

S-1410 Series only

−

0.3

× VDD

Input pulse width "H"

thigh1

−

1.5

−

μs

Input pulse width "L"

tlow1

−

1.5

−

μs

Watchdog output delay time

tWOUT

−

μs

Reset output delay time

tROUT

−

μs

Input setup time

tiset

−

1.0

−

μs

*1.

−VDET: Actual detection voltage, −VDET(S): Set detection voltage

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