S-19500A03A-E8T1U4 Datasheet, PDF (11/52 Pages) Seiko Instruments Inc – CMOS VOLTAGE REGULATOR WITH WATCHDOG TIMER AND RESET FUNCTION

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
3. Watchdog timer block
3. 1 S-19500 Series (Product with watchdog enable function)
Table 12
Item
Symbol
Watchdog activation
threshold current
IO,WDact
Watchdog deactivation
threshold current
IO,WDdeact
Watchdog activation
hysteresis current
IO,WDhys
Watchdog activation
threshold voltage
VWADJ,th
WADJ pin current ratio
IOUT
IWADJ
WADJ pin internal resistance RWADJ,int
Charge curernt
ID,cha
Discharge current
ID,dcha
Upper timing threshold
voltage
VDU
Lower watchdog timing
threshold voltage
VDWL
Watchdog output
pulse period
tWD,p
Watchdog output "L" time tWD,l
Watchdog trigger time
tWI,tr
WEN pin input voltage "H" VSH
WEN pin input voltage "L" VSL
WEN pin input current "H" ISH
WEN pin input current "L" ISL
V_DLY
(VIN = 13.5 V, Tj = −40°C to +150°C unless otherwise specified)
Condition
Min.
Typ.
Max.
Unit
Test
Circuit
WADJ pin is open
1.1
1.5
1.9
mA
7
WADJ pin is open
−
1.3
−
mA
7
WADJ pin is open
0.1
0.2
−
mA
7
−
1.28
1.35
1.45
V
8
VWADJ = 0 V, IOUT = 10 mA
−
VDLY = 1.0 V
VDLY = 1.0 V
−
−
750
−
−
8
490
650
845
kΩ
−
2
5
8
μA
9
0.6
1.3
2.0
μA
9
1.5
1.9
2.3
V
9
−
0.5
0.7
0.9
V
9
CDLY = 47 nF
VOUT > −VDET, CDLY = 47 nF
Watchdog timer is activated
CDLY = 47 nF
−
−
VWEN = VOUT(S)
VWEN = 0 V
38
54
72
ms
7
6
11
16
ms
7
32
43
56
ms
7
2
−
−
V
10
−
−
0.8
V
10
−
−
1
μA
10
−
−
0.1
μA
10
V_DU
V_DWL
t
t_WI,tr
t_WD,l
V_{WO / RO}
t_WD,p
t
Figure 5
11