HT1330 Просмотр технического описания (PDF) - Holtek Semiconductor
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HT1330 Datasheet PDF : 8 Pages
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HT1330
Absolute Maximum Rating
Supply Voltage.................................-0.3V to 5V
Input Voltage .................VSS-0.3V to VDD+0.3V
Storage Temperature.................-50°C to 125°C
Operating Temperature ................-0°C to 70°C
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi-
mum Ratings² may cause substantial damage to the device. Functional operation of this de-
vice at other conditions beyond those listed in the specification is not implied and prolonged
exposure to extreme conditions may affect device reliability.
Electric Characteristics
Symbol
Parameter
VDD Supply Voltage
Test Conditions
VDD
1.5V
Conditions
¾
IDD
Operating Current
1.5V
fosc=32768Hz
No load
VEE Display Voltage
1.25~1.7V
¾
IIN
Switch Input Current
1.5V VIN=VDD
VSTR Osc Starting Voltage
¾
Within 3 secs
Df/f
Frequency Stability
1.25~1.7V
¾
IOHA Alarm Output Drive Current 1.5V VOH=1.35V
fOUT Alarm Output Frequency
1.5V
¾
IOHF
Busy Flag Output Drive
Current
1.5V VOH=1.35V
Ta=25°C
Min. Typ. Max. Unit
1.25 1.50 1.70 V
¾ ¾ 2 mA
-1.2 -1.5 -1.7 V
5
¾ 65 mA
1.35 ¾ ¾ V
¾ ¾ 10 PPM
-480 ¾ ¾ mA
¾ 4096 ¾ Hz
-480 ¾ ¾ mA
Functional Description
When power is turned on, all the LCD segments
are illuminated to display ²18:88² and the
alarm sounds 2 seconds.
For fast-test, hold the ²TP1² pin high and the
minute digit will be increased every second.
In the count-down mode, when the time has gone
past the set time and the alarm is stopped, the set
time will remain at its current state or be reset to
0:00 depending on the bonding of the ²OPT² pin
to VDD.
In the timer mode, while the timer is counting,
the actual time can be displayed by pressing ²S1².
Once ²S1² is released, the count-down time will
be shown instead.
In the count-up mode, the LCD display is nor-
mally in minutes and seconds where the maxi-
mum count-up period is 20 minutes. If ²S2² is
pressed, the LCD display will revert to hours
and minutes and the maximum count-up time
will turn out to be 20 hours.
The timer alarm will sound during the
count-down process as listed below:
4 sounds are generated at 10 minutes before
the set time is up.
8 sounds are generated at 5 minutes before the
set time is up.
4
August 10, 2000
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