HT45R37
A.C. Characteristics
Ta=25°C
Test Conditions
Conditions
2.2V~5.5V
3.0V~5.5V
4.5V~5.5V
5V
Symbol
Parameter
Min.
Typ.
Max.
Unit
VDD
400
400
4000
8000
12000
+2%
kHz
kHz
kHz
kHz
kHz
kHz
¾
¾
System Clock
fSYS1
¾
(Crystal OSC, ERC OSC)
400
¾
4000
8000
12000
-2%
-2%
-2%
fSYS2
System Clock (HIRC OSC)
5V
+2%
¾
¾
5V
+2%
System Clock
fSYS3
f4MRCOSC
fRTCOSC
2.2V~5.5V
32768
Hz
¾
¾
(RTC Crystal OSC)
4MHz External RC OSC
RTC Frequency
5V
4000
32768
¾
+2%
¾
kHz
Hz
External R=150kW
-2%
¾
0
¾
¾
2.2V~5.5V
3.0V~5.5V
4.5V~5.5V
2.2V~5.5V, After Trim
¾
4000
8000
12000
34.4
¾
kHz
kHz
kHz
ms
Timer I/P Frequency
(TMR0/TMR1)
fTIMER
0
¾
¾
0
¾
fRC32K
tRES
32K RC Period (LIRC)
28.1
1
31.25
¾
¾
¾
¾
¾
External Reset Low Pulse Width
Low Voltage Reset Time
ms
tLVR
0.1
¾
0.4
0.6
ms
¾
tSST1
tSYS
*
*
System Start-up Timer Period
Power-on
1024
¾
System Start-up Timer Period
for XTAL or RTC oscillator
Wake-up from Power
Down Mode
tSST2
tSYS
1024
1
¾
¾
¾
¾
¾
System Start-up Timer Period
for RC or External Clock
Wake-up from Power
Down Mode
tSST3
tINT
tAD
tSYS*
2
Interrupt Pulse Width
A/D Clock Period
1
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
ms
ms
tAD
0.5
¾
¾
tADC
A/D Conversion Time
16
RESTD Reset Delay Time
100
ms
Note: *tSYS=1/fSYS1, 1/fSYS2 or 1/fSYS3
Rev. 1.20
7
February 25, 2011
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
