HT49C50 datasheet(7/52 Pages) HOLTEK

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Absolute Maximum Ratings

Supply Voltage........................VSS-0.3V to 5.5V

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

Input Voltage.................VSS-0.3V to VDD+0.3V

Operating Temperature ..............-25°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 device

at other conditions beyond those listed in the specification is not implied and prolonged expo-

sure to extreme conditions may affect device reliability.

D.C. Characteristics

Ta=25°C

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

VDD

Conditions

VDD

Operating Voltage

¾¾

2.2

5.2

IDD1

Operating Current

(Crystal OSC)

3V No load,

fSYS=4MHz

2.5

IDD2

Operating Current (RC OSC)

3V No load,

fSYS=2MHz

0.75

1.5

ISTB1

Standby Current

(RTC Enable, LCD ON)

3V No load,

system halt

¾¾

ISTB2

Standby Current

(RTC Disable, LCD OFF)

3V No load,

system halt

¾¾

VIL

I/O Port Input Low Voltage

0.9

1.5

VIH

I/O Port Input High Voltage

2.1

3.5

VIL1

Input Low Voltage

(RES, INT0, INT1, TMR0, TMR1)

3V RES=0.5VDD

INT0/1=0.3VDD

TMR0/1=0.3VDD

1.5/0.9

2.5/1.5

VIH1

Input High Voltage

(RES, INT0, INT1, TMR0, TMR1)

0.8VDD

2.4

4.0

IOL

I/O Ports Sink Current

3V VDD=3V,

VOL=0.3V

1.5

2.5

5V VDD=5V,

VOL=0.5V

HT49C50

August 18, 1999

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