HT83R074 datasheet(6/38 Pages) HOLTEK

6 / 38 page

A.C. Characteristics

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

fSYS

System Clock

(Crystal OSC, RC OSC)

¾ 2.4V~5.2V

MHz

fTIMER

Timer Input Frequency

2.4V~5.2V

MHz

tWDTOSC

Watchdog Oscillator

100

200

148

tWDT1

Watchdog Time-out Period

(WDT OSC)

Without WDT prescaler

tWDT2

Watchdog Time-out Period

(System OSC)

¾ Without WDT prescaler

1024

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

tDRT

Data ROM Access Timer

¾¾

tDRR

Data ROM Enable Read

¾ Read after data ROM enable

¾¾

Characteristics Curves

R vs. F Characteristics Curve

HT83R074

Rev. 1.00

May 17, 2007

R ( k W )

H T 8 3 R 0 7 4 R v s . F C h a r t

1 4 4

1 8 8

2 7 5

5 6 0

3 V

4 . 5 V

1 0

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