Holtek HT46R47, Manual

Page: 7 / 77

A.C. Characteristics
Ta=25
°
C
Symbol Parameter
Test Conditions
Min. Typ. Max. Unit
V
DD
Conditions
f
SYS
System Clock
¾
2.2V~5.5V 400
¾
4000 kHz
¾
3.3V~5.5V 400
¾
8000 kHz
f
TIMER
Timer I/P Frequency
(TMR)
¾
2.2V~5.5V 0
¾
4000 kHz
¾
3.3V~5.5V 0
¾
8000 kHz
t
WDTOSC
Watchdog Oscillator Period
3V
¾
45 90 180
m
s
5V
¾
32 65 130
m
s
t
WDT1
Watchdog Time-out Period
(RC)
¾ ¾
2
15
¾
2
16
t
WDTOSC
t
WDT2
Watchdog Time-out Period
(System Clock)
¾ ¾
2
17
¾
2
18
t
SYS
t
RES
External Reset Low Pulse Width
¾ ¾
1
¾ ¾ m
s
t
SST
System Start-up Timer Period
¾
Wake-up from HALT
¾
1024
¾
*t
SYS
t
LVR
Low Voltage Reset Time
¾ ¾
0.25 1 2 ms
t
INT
Interrupt Pulse Width
¾ ¾
1
¾ ¾ m
s
t
AD1
A/D Clock Period
-
HT46R46
¾ ¾
0.5
¾ ¾ m
s
t
AD2
A/D Clock Period
-
HT46R47/HT46R48A/HT46R49
¾ ¾
1
¾ ¾ m
s
t
ADC1
A/D Conversion Time
-
HT46R46
¾ ¾ ¾
64
¾
t
AD1
t
ADC2
A/D Conversion Time
-
HT46R47/HT46R48A/HT46R49
¾ ¾ ¾
76
¾
t
AD2
t
ADCS1
A/D Sampling Time
-
HT46R46
¾ ¾ ¾
32
¾
t
AD1
t
ADCS2
A/D Sampling Time
-
HT46R47/HT46R48A/HT46R49
¾ ¾ ¾
32
¾
t
AD2
Note: *t
SYS
=1/f
SYS
HT46R46/C46/R47/C47/R48A/C48A/R49
Rev. 1.41 7 December 30, 2008