Absolute Maximum Rating

Supply Voltage.................................-0.3V to 5V

Storage Temperature.................-50°Cto125°C

Operating Temperature ................-0°Cto70°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

Ta=25°C

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

Conditions

Supply Voltage

1.5V

¾

1.25

1.50 1.70

V

Operating Current

1.5V

fosc=32768Hz

No load

¾¾

2

mA

Display Voltage

1.25~1.7V

¾-1.2

-1.5 -1.7

V

Switch Input Current

1.5V

5

¾

65

mA

Osc Starting Voltage

¾

Within 3 secs

1.35

¾¾

V

Df/f

Frequency Stability

1.25~1.7V

¾¾

¾

10

PPM

Alarm Output Drive Current

1.5V

-480

¾¾

mA

Alarm Output Frequency

1.5V

¾¾

4096

¾

Hz

Busy Flag Output Drive

Current

1.5V

-480

¾¾

mA

HT1330

4

August 10, 2000

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.