Rainbow Electronics HT49R70A-1 - Manual (Page 6)

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