HT82B40R datasheet(5/57 Pages) HOLTEK

5 / 57 page

A.C. Characteristics

Ta=25

°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

fRCSYS

RC Clock with 8-bit Prescaler Register

¾¾

kHz

tWDT

Watchdog Time-out Period

(System Clock)

¾¾

1024

¾¾

1/fRCSYS

USBD+, USBD- Rising & Falling Time

¾¾

300

tOST

Oscillation Start-up Timer Period

¾¾

1024

tSYS

tOSCsetup Crystal Setup

¾¾

fINO125V

Internal Oscillator Frequency for 12MHz

4.0V~

5.5V

10.80

12.00

13.20

MHz

fINO123V

Internal Oscillator Frequency for 12MHz

3.0~

4.0V

10.56

12.00

13.44

MHz

fINOUSB

Internal Oscillator Frequency with USB

Mode

4.2~

5.5V

11.82

12.00

12.18

MHz

Note:

tSYS=1/fSYS

Power_on period = tWDT +tOST +tOSCsetup

WDT Time_out in Normal Mode = 1/ fRCSYS

´ 256 ´ WDTS + tWDT

WDT Time_out in Power Down Mode = 1/ fRCSYS

´ 256 ´ WDTS + tOST +tOSCsetup

Trimmed for 5V operation using factory trim values. Frequency Trim to 12MHz

±3%

HT82B40R/HT82B40A

Rev. 1.10

September 4, 2009

HT82B40R 데이터시트(PDF) 5 Page - Holtek Semiconductor Inc

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