HT48CA1 View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
MFG CO.
'HT48CA1' PDF : 39 Pages View PDF
HT48RA1/HT48CA1
A.C. Characteristics
Ta=25°C
Symbol
Parameter
Test Conditions
VDD
Conditions
Min. Typ. Max. Unit
fSYS1
System Clock (Crystal OSC)
¾ 2.0V~5.5V
¾ 3.3V~5.5V
400
¾ 4000 kHz
400
¾ 8000 kHz
fSYS2
System Clock (RC OSC)
¾ 2.0V~5.5V
¾ 3.3V~5.5V
400
¾ 4000 kHz
400
¾ 8000 kHz
fTIMER
3V
Timer I/P Frequency (TMR0/TMR1)
50% duty
5V
0
¾ 4000 kHz
0
¾ 8000 kHz
3V
tWDTOSC Watchdog Oscillator Period
¾
5V
45
90
180
ms
32
65
130
ms
tWDT1
Watchdog Time-out Period
(WDT OSC)
3V
11
23
46
ms
Without WDT prescaler
5V
8
17
33
ms
tWDT2
Watchdog Time-out Period (fSYS/4) ¾ Without WDT prescaler ¾ 1024 ¾
tSYS
tRES
External Reset Low Pulse Width
¾
¾
1
¾
¾
ms
tSST
System Start-up Timer Period
¾
Power-up reset or
wake-up from HALT
¾ 1024 ¾
tSYS
tLVR
Low Voltage Width to Reset
¾
¾
1
¾
¾
ms
tINT
Interrupt Pulse Width
¾
¾
1
¾
¾
ms
Note: tSYS=1/(fSYS)
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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