HT48RA5/HT48CA5
A.C. Characteristics
Test Conditions
Symbol
Parameter
V
DD
f
SYS1
System Clock (Crystal OSC)
¾
¾
¾
¾
3V
Timer I/P Frequency (TMR0/TMR1)
5V
t
WDTOSC
3V
Watchdog Oscillator Period
5V
t
WDT1
t
WDT2
t
RES
t
SST
t
LVR
t
INT
Watchdog Time-out Period
(WDT OSC)
Watchdog Time-out Period (f
SYS
/4)
External Reset Low Pulse Width
System Start-up Timer Period
Low Voltage Width to Reset
Interrupt Pulse Width
3V
Without WDT prescaler
5V
¾
¾
¾
¾
¾
Without WDT prescaler
¾
Power-up reset or
wake-up from HALT
¾
¾
8
¾
1
¾
1
1
17
1024
¾
1024
¾
¾
33
¾
¾
¾
¾
¾
ms
t
SYS
ms
t
SYS
ms
ms
¾
50% duty
0
45
32
11
Conditions
2.0V~5.5V
3.3V~5.5V
2.0V~5.5V
3.3V~5.5V
400
400
400
400
0
¾
¾
¾
¾
¾
¾
90
65
23
4000
8000
4000
8000
4000
8000
180
130
46
kHz
kHz
kHz
kHz
kHz
kHz
ms
ms
ms
Min.
Typ.
Max.
Unit
Ta=25°C
f
SYS2
System Clock (RC OSC)
f
TIMER
Note: t
SYS
=1/(f
SYS
)
Power-on Reset Characteristics
Test Conditions
Symbol
V
POR
RR
VDD
t
POR
Parameter
V
DD
VDD Start Voltage to Ensure
Power-on Reset
VDD raising rate to Ensure
Power-on Reset
Minimum Time for VDD Stays at
V
POR
to Ensure Power-on Reset
¾
¾
¾
Conditions
¾
¾
¾
¾
0.05
200
¾
¾
¾
0
¾
¾
mV
V/ms
ms
Min.
Typ.
Max.
Unit
V
D D
t
P
O R
R R
V D D
V
P O R
T im e
Rev. 1.40
5
May 22, 2009
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
