S-19501AY3A-E8T1U4 datasheet(11/52 Pages) SII

Part #	S-19501AY3A-E8T1U4

Description	CMOS VOLTAGE REGULATOR WITH WATCHDOG TIMER AND RESET FUNCTION

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Manufacturer	SII [Seiko Instruments Inc]

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FOR AUTOMOTIVE 125°C OPERATION HIGH-WITHSTAND VOLTAGE CMOS VOLTAGE REGULATOR WITH WATCHDOG TIMER AND RESET FUNCTION

Rev.1.2_01

S-19500/19501 Series

11

3. Watchdog timer block

3. 1 S-19500 Series (Product with watchdog enable function)

Table 12

(VIN = 13.5 V, Tj =

−40°C to +150°C unless otherwise specified)

Item

Symbol

Condition

Min.

Typ.

Max.

Unit

Test

Circuit

Watchdog activation

threshold current

IO,WDact

WADJ pin is open

1.1

1.5

1.9

mA

7

Watchdog deactivation

threshold current

IO,WDdeact

WADJ pin is open

−

1.3

−

mA

7

Watchdog activation

hysteresis current

IO,WDhys

WADJ pin is open

0.1

0.2

−

mA

7

Watchdog activation

threshold voltage

VWADJ,th

−

1.28

1.35

1.45

V

8

WADJ pin current ratio

IOUT

IWADJ

VWADJ = 0 V, IOUT = 10 mA

−

750

−

8

WADJ pin internal resistance RWADJ,int

−

490

650

845

k

Ω

−

Charge curernt

ID,cha

VDLY = 1.0 V

2

5

8

μA

9

Discharge current

ID,dcha

VDLY = 1.0 V

0.6

1.3

2.0

μA

9

Upper timing threshold

voltage

VDU

−

1.5

1.9

2.3

V

9

Lower watchdog timing

threshold voltage

VDWL

−

0.5

0.7

0.9

V

9

Watchdog output

pulse period

tWD,p

CDLY = 47 nF

38

54

72

ms

7

Watchdog output "L" time

tWD,l

VOUT

> −VDET, CDLY = 47 nF

Watchdog timer is activated

6

11

16

ms

7

Watchdog trigger time

tWI,tr

CDLY = 47 nF

32

43

56

ms

7

WEN pin input voltage "H"

VSH

−

2

−

V

10

WEN pin input voltage "L"

VSL

−

−−

0.8

V

10

WEN pin input current "H"

ISH

VWEN = VOUT(S)

−−

1

μA

10

WEN pin input current "L"

ISL

VWEN = 0 V

−−

0.1

μA

10

tWI,tr

t

VDLY

VDU

VDWL

tWD,l

t

VWO / RO

tWD,p

Figure 5

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S-19501AY3A-E8T1U4 Datasheet(PDF) 11 Page - Seiko Instruments Inc

S-19501AY3A-E8T1U4 Datasheet(HTML) 11 Page - Seiko Instruments Inc

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