DS1857 datasheet(5/22 Pages) MAXIM

Part #	DS1857

Description	Dual Temperature-Controlled Resistors with External Temperature Input and Monitors

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Manufacturer	MAXIM [Maxim Integrated Products]

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Dual Temperature-Controlled Resistors with

External Temperature Input and Monitors

_____________________________________________________________________

5

AC ELECTRICAL CHARACTERISTICS (continued)

(VCC = 3.0V to 5.5V, TA = -40°C to +95°C, unless otherwise noted.)

Note 11: After this period, the first clock pulse is generated.

Note 12: The maximum tHD:DAT only to has be met if the device does not stretch the LOW period (tLOW) of the SCL signal.

Note 13: A device must internally provide a hold time of at least 300ns for the SDA signal (see the VIH MIN of the SCL signal) in order

to bridge the undefined region of the falling edge of SCL.

Note 14: CB—total capacitance of one bus line, timing referenced to 0.9 x VCC and 0.1 x VCC.

Note 15: EEPROM write begins after a STOP condition occurs.

Typical Operating Characteristics

(VCC = 5.0V, TA = +25°C, unless otherwise noted.)

SUPPLY CURRENT vs. TEMPERATURE

TEMPERATURE (°C)

80

60

40

20

0

-20

540

580

620

660

700

500

-40

100

SUPPLY CURRENT vs. VOLTAGE

VOLTAGE (V)

5.0

4.5

4.0

3.5

450

500

550

600

650

700

400

3.0

5.5

RESISTANCE vs. SETTING

SETTING

250

200

150

100

50

10

20

30

40

50

60

0

0300

ACTIVE SUPPLY CURRENT

vs. SCL FREQUENCY

SCL FREQUENCY (kHz)

300

200

100

540

580

620

660

700

500

0400

SDA = 5V

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