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HT48RA3 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc

Part # HT48RA3
Description  HT48RA3/HT48CA3
Download  38 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT48RA3 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc

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A.C. Characteristics
Ta=25
°C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VDD
Conditions
fSYS1
System Clock
(Crystal OSC)
¾
2.0V~5.5V
400
¾
4000
kHz
¾
3.3V~5.5V
400
¾
8000
kHz
fSYS2
System Clock
(RC OSC)
¾
2.0V~5.5V
400
¾
4000
kHz
¾
3.3V~5.5V
400
¾
8000
kHz
fTIMER
Timer I/P Frequency
(TMR0/TMR1)
3V
50% duty
0
¾
4000
kHz
5V
0
¾
8000
kHz
tWDTOSC
Watchdog Oscillator Period
3V
¾
45
90
180
ms
5V
32
65
130
ms
tWDT1
Watchdog Time-out Period
(WDT OSC)
3V
Without WDT prescaler
11
23
46
ms
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
¾¾
1
¾¾
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
¾¾
1
¾¾
ms
tINT
Interrupt Pulse Width
¾¾
1
¾¾
ms
Note: tSYS=1/(fSYS)
Power-on Reset Characteristics
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VDD
Conditions
VPOR
VDD Start Voltage to Ensure
Power-on Reset
¾¾
¾
¾
0mV
RRVDD
VDD raising rate to Ensure
Power-on Reset
¾¾
0.05
¾¾
V/ms
tPOR
Minimum Time for VDD Stays at
VPOR to Ensure Power-on Reset
¾¾
200
¾¾
ms
HT48RA3/HT48CA3
Rev. 1.50
5
June 29, 2009
T i m e
V D D
V P O R
R R V D D
t P O R


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