HT49R50 datasheet(8/59 Pages) HOLTEK

8 / 59 page

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

VDD

Conditions

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

612

5V VDD=5V,

VOL=0.5V

IOH

I/O Ports Source Current

3V VDD=3V,

VOH=2.7V

-2

-3

5V VDD=5V,

VOH=4.5V

-4

-6

RPH

Pull-high Resistance of

I/O Ports and INT0, INT1

A.C. Characteristics

Ta=25°C

Symbol

Parameter

Test Conditions

Min. Typ. Max. Unit

VDD

Conditions

fSYS1

System Clock (Crystal OSC)

3V VDD=3V

455

2000 kHz

5V VDD=5V

455

4000 kHz

fSYS2

System Clock (RC OSC)

3V VDD=3V

400

2000 kHz

5V VDD=5V

400

3000 kHz

fTIMER

Timer I/P Frequency

(TMR0/TMR1)

3V VDD=3V

4000 kHz

5V VDD=5V

4000 kHz

tWDTOSC Watchdog Oscillator

3V VDD=3V

180

5V VDD=5V

130

tRES

External Reset Low

Pulse Width

¾¾

tSST

System Start-up

Timer Period

Power-up or

wake-up from halt

1024

tSYS

tINT

Interrupt Pulse Width

¾¾

Note:

tSYS= 1/fSYS

HT49R50

October 22, 1999

HT49R50 Datasheet(PDF) 8 Page - Holtek Semiconductor Inc

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