Holtek HT48R10A-1 - A.C. Characteristics

A.C. Characteristics
Ta=25°C
Symbol Parameter
Test Conditions
Min. Typ. Max. Unit
V
DD
Conditions
f
SYS1
System Clock
(Crystal OSC)
¾
2.2V~5.5V 400
¾
4000 kHz
¾
3.3V~5.5V 400
¾
8000 kHz
f
SYS2
System Clock
(RC OSC)
¾
2.2V~5.5V 400
¾
4000 kHz
¾
3.3V~5.5V 400
¾
8000 kHz
f
SYS3
System Clock
(Internal RC OSC)
5V
3.2MHz 1800
¾
5400 kHz
1.6MHz 900
¾
2700 kHz
800kHz 450
¾
1350 kHz
400kHz 225
¾
675 kHz
f
TIMER
Timer I/P Frequency
(TMR)
¾
2.2V~5.5V 0
¾
4000 kHz
¾
3.3V~5.5V 0
¾
8000 kHz
t
WDTOSC
Watchdog Oscillator Period
3V
¾
45 90 180
ms
5V
¾
32 65 130
ms
t
WDT1
Watchdog Time-out Period
(WDT OSC)
3V
Without WDT prescaler
11 23 46 ms
5V 8 17 33 ms
t
WDT2
Watchdog Time-out Period
(System Clock)
¾
Without WDT prescaler
¾
1024
¾
t
SYS
*
t
WDT3
Watchdog Time-out Period
(RTC OSC)
¾
Without WDT prescaler
¾
7.812
¾
ms
t
RES
External Reset Low Pulse Width
¾¾
1
¾¾ms
t
SST
System Start-up Timer Period
¾
Wake-up from
HALT
¾
1024
¾
t
SYS
*
t
LVR
Low Voltage Width to Reset
¾¾
0.25 1 2 ms
t
INT
Interrupt Pulse Width
¾¾
1
¾¾ms
*t
SYS
= 1/f
SYS1
, 1/f
SYS2
or 1/f
SYS3
Note The internal RC system clock has a typical base frequency of 3.2MHz at 5V. The other internal RC
system typical clock frequencies of 1.6MHz, 800kHz and 400kHz at 5V are division ratios of this
3.2MHz base frequency.
Chapter 1 Hardware Structure
15