Holtek HT827A0 Manual page 7

A.C. Characteristics
Symbol Parameter
f
System Clock (Crystal OSC)
SYS1
f
System Clock (RC OSC)
SYS2
f
Timer I/P Frequency (TMR)
TIMER
t Watchdog Oscillator
WDTOSC
t
Watchdog Timeout Period (RC)
WDT1
Watchdog Timeout Period
t
WDT2
(System Clock)
t
External Reset Low Pulse Width 5V
RES
t Interrupt Pulse Width
INT
Note: t =1/(f )
SYS SYS
Test Conditions
Min.
V Conditions
DD
3V 400
¾
5V ¾ 400
3V ¾ 400
5V ¾ 400
3V ¾ 0
5V ¾ 0
5V ¾ 31
Without WDT
5V 8
prescaler
Without WDT
5V ¾
prescaler
¾ 1
5V ¾ 1
7
HT827A0
Ta=25°C
Typ. Max. Unit
4000 kHz
¾
¾ 4000 kHz
¾ 4000 kHz
¾ 4000 kHz
¾ 4000 kHz
¾ 4000 kHz
78 140 ms
20 36 ms
t
1024 ¾
SYS
¾ ¾ ms
¾ ¾ ms
March 15, 2000