DS620 datasheet(4/15 Pages) DALLAS

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DS620 Digital Thermometer and Thermostat

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AC ELECTRICAL CHARACTERISTICS

EEPROM AC Electrical Characteristics

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

EEPROM Write Cycle Time

TWR

-40°C to +85°C

-40°C ≤ TA ≤ +85°C

(Note 1)

10k

20k

EEPROM Writes

NEEWR

TA = +25°C (Note 1)

40k

80k

writes

EEPROM Data Retention

tEEDR

-40°C to +125°C (Note 2)

years

2-Wire AC Electrical Characteristics

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

SCL Frequency

fSCL

400

KHz

Bus Free Time Between a

STOP and START Condition

tBUF

1.3

µs

START and Repeat START

Hold Time from Falling SCL

tHD:STA

(Note 3, 4)

0.6

µs

Low Period of SCL

tLOW

(Note 3)

1.3

µs

High Period of SCL

tHIGH

(Note 3)

0.6

µs

Repeated START Condition

Setup Time to Rising SCL

tSU:STA

(Note 3)

0.6

µs

Data-Out Hold Time from

Falling SCL

tHD:DAT

(Note 3)

0.9

µs

Data-In Setup Time to Rising

SCL

tSU:DAT

(Note 3)

100

Rise Time of SDA and SCL

(Note 3, 5)

20 +

0.1xCB

1000

Fall Time of SDA and SCL

(Note 3, 5)

20 +

0.1xCB

300

STOP Setup Time to Rising

SCL

TSU:STO

0.6

µs

Capacitive Load for Each BUS

Line

400

Input Capacitance

Spike Pulse Width that can be

Suppressed by Input Filter

Note 1: VDD must be 2.0V to 3.5V.

Note 2: Write done at 25°C.

Note 3: All values referenced to 0.9 VDD and 0.1 VDD.

Note 4: After this period the first clock pulse is generated.

Note 5: For example, if CB = 300pF, then tR(MIN) = tF(MIN) = 50ns.

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