DS1904 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS1904

RTC iButton

Dallas Semiconductor -> Maxim Integrated 

READ/WRITE TIMING DIAGRAM Figure 9

Write-one Time Slot

VPULLUP

VPULLUP MIN

VIH MIN

VIL MAX

0V

RESISTO

MASTER

Write-zero Time Slot

VPULLUP

VPULLUP MIN

VIH MIN

VIL MAX

0V

RESISTOR

MASTER

tSLOT

DS1904

Sampling

tLOW1

15µs

(OD: 2µs)

(OD: 6µs)

60µs

60 µs≤ tSLOT < 120

1 µs≤ tLOW1 < 15 µs

1 µs≤ tREC < ∞

tSLOT

DS1904

Sampling Window

15µs

(OD: 2µs)

(OD: 6µs)

60µs

t LOW0

60 µs ≤ tLOW0 < tSLOT < 120 µs

1 µs ≤ tREC < ∞

tREC

tREC

Read-data Time Slot

VPULLUP

VPULLUP MIN

VIH MIN

VIL MAX

0V

RESISTOR

MASTER

DS1904

tSLOT

Master

Sampling Window

tSU

tLOWR

tRDV

60 µs ≤ tSLOT < 120 µs

1 µs ≤ tLOWR < 15 µs

0 ≤ tRELEASE < 45 µs

tREC

tRELEASE

1 µs ≤ tREC < ∞

tRDV = 15 µs

tSU < 1 µs

10 of 12

DS1904

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