HT48CA5 查看數據表（PDF） - Holtek Semiconductor
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HT48CA5 Datasheet PDF : 38 Pages
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HT48RA5/HT48CA5
A.C. Characteristics
Symbol
Parameter
fSYS1
System Clock (Crystal OSC)
Test Conditions
VDD
Conditions
¾ 2.0V~5.5V
¾ 3.3V~5.5V
fSYS2
System Clock (RC OSC)
¾ 2.0V~5.5V
¾ 3.3V~5.5V
fTIMER
3V
Timer I/P Frequency (TMR0/TMR1)
50% duty
5V
3V
tWDTOSC Watchdog Oscillator Period
¾
5V
tWDT1
Watchdog Time-out Period
(WDT OSC)
3V
Without WDT prescaler
5V
tWDT2
tRES
Watchdog Time-out Period (fSYS/4) ¾ Without WDT prescaler
External Reset Low Pulse Width
¾
¾
tSST
System Start-up Timer Period
¾
Power-up reset or
wake-up from HALT
tLVR
Low Voltage Width to Reset
¾
¾
tINT
Interrupt Pulse Width
¾
¾
Min.
400
400
400
400
0
0
45
32
11
8
¾
1
¾
1
1
Note: tSYS=1/(fSYS)
Typ.
¾
¾
¾
¾
¾
¾
90
65
23
17
1024
¾
1024
¾
¾
Ta=25°C
Max. Unit
4000 kHz
8000 kHz
4000 kHz
8000 kHz
4000 kHz
8000 kHz
180
ms
130
ms
46
ms
33
ms
¾
tSYS
¾
ms
¾
tSYS
¾
ms
¾
ms
Power-on Reset Characteristics
Symbol
Parameter
VPOR
RRVDD
tPOR
VDD Start Voltage to Ensure
Power-on Reset
VDD raising rate to Ensure
Power-on Reset
Minimum Time for VDD Stays at
VPOR to Ensure Power-on Reset
Test Conditions
VDD
Conditions
¾
¾
¾
¾
¾
¾
Min. Typ. Max. Unit
¾
¾
0.05
¾
200
¾
0
mV
¾ V/ms
¾
ms
V DD
tP O R
R R VDD
V POR
T im e
Rev. 1.40
5
May 22, 2009
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