HT48CA1(2004) データシートの表示（PDF） - Holtek Semiconductor
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HT48CA1 Datasheet PDF : 39 Pages
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HT48RA1/HT48CA1
A.C. Characteristics
Ta=25°C
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
tSST
Watchdog Time-out Period (fSYS/4) ¾ Without WDT prescaler
External Reset Low Pulse Width
¾
¾
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
tACC
Data ROM Access Time
¾
¾
Min.
400
400
400
400
0
0
45
32
11
8
¾
1
¾
1
1
1
Typ.
¾
¾
¾
¾
¾
¾
90
65
23
17
1024
¾
1024
¾
¾
¾
Max.
4000
8000
4000
8000
4000
8000
180
130
46
33
¾
¾
¾
¾
¾
¾
Unit
kHz
kHz
kHz
kHz
kHz
kHz
ms
ms
ms
ms
tSYS
ms
tSYS
ms
ms
ms
Note: tSYS=1/(fSYS)
Rev. 1.00
5
June 25, 2004
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