HT37Q70/60/50/40/30/20
A.C. Characteristics
Ta=25°C
Test Conditions
Conditions
2.4V~5.5V
3.3V~5.5V
3.6V~5.5V
¾
Symbol
Parameter
Min.
Typ.
Max.
Unit
VDD
8000 11059 12800
8000 11059 12800
8000 11059 12800
kHz
Oscillator Clock
fOSC
¾
(Crystal OSC/RC OSC)
kHz
ms
3V
5V
¾
45
32
1
90
65
¾
180
130
¾
tWDTOSC
Watchdog Oscillator Period
¾
ms
tRES
tSST
tLVR
External Reset Low Pulse Width
System Start-up Timer Period
Low Voltage Width to Reset
¾
ms
Power-up or wake-up from
HALT
tSYS
ms
1024
1.00
¾
¾
¾
¾
0.25
2.00
¾
Note: tSYS= 1/fSYS
fSYS=fOSC/2
Characteristics Curves
R
v
s
.
F
C
h
a
r
t
1
1
1
1
6
4
2
0
3
.
0
V
8
6
4
4
.
5
V
8
2
9
1
1
0
0
1
1
5
1
2
0
1
5
0
1
8
0
R
W
)
k
V
v
s
.
F
C
h
a
r
t
(
F
o
r
3
.
0
V
&
1
1
1
1
6
5
4
3
1
1
.
0
5
9
W
M
(
H
4
z
.
/
5
1
V
0
)
0
k
1
1
1
2
1
0
1
1
.
0
5
9
W
M
(
H
3
z
V
/
)
1
1
5
k
9
8
2
.
4
2
.
6
3
.
0
2
.
8
4
.
0
4
3
.
4
3
.
2
3
.
8
4
.
4
4
3
.
6
.
2
5
0
.
2
4
.
8
.
6
5
.
V
D
D
(
V
)
Rev. 1.00
13
February 17, 2009
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
