A.c. characteristics – Rainbow Electronics HT49R70A-1 User Manual
Page 6
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A.C. Characteristics
Ta=25
°C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
f
SYS1
System Clock (Crystal OSC)
3V
¾
400
¾
4000
kHz
5V
¾
400
¾
8000
kHz
f
SYS2
System Clock (RC OSC)
3V
¾
400
¾
4000
kHz
5V
¾
400
¾
8000
kHz
f
SYS3
System Clock (32768Hz Crystal OSC)
¾
¾
¾
32768
¾
Hz
f
RTCOSC
RTC Frequency
¾
¾
¾
32768
¾
Hz
f
TIMER
Timer I/P Frequency (TMR0/TMR1)
3V
¾
0
¾
4000
kHz
5V
¾
0
¾
8000
kHz
t
WDTOSC
Watchdog Oscillator
3V
¾
45
90
180
ms
5V
¾
35
65
130
ms
t
RES
External Reset Low Pulse Width
¾
¾
1
¾
¾
ms
t
SST
System Start-up Timer Period
¾
Power-up or wake-up
from HALT
¾
1024
¾
t
SYS
t
INT
Interrupt Pulse Width
¾
¾
1
¾
¾
ms
Note:
t
SYS
= 1/f
SYS
HT49R70A-1
Rev. 1.00
6
December 4, 2001
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