0

8

4

16

12

20

24

FREQUENCY (MHz)

TEMPERATURE ERROR

vs. SUPPLY NOISE FREQUENCY

0.1

1

10

100

µF CAPACITOR REMOVED

2200pF BETWEEN DXN_ AND DXP_

20

-20

1

10

100

TEMPERATURE ERROR

vs. PC BOARD RESISTANCE

-10

LEAKAGE RESISTANCE (M

Ω)

0

10

PATH = DXP_ TO GND

-2

-1

0

1

2

3

4

-50

-10

-30

1030

50

7090

110

TEMPERATURE ERROR

vs. TEMPERATURE

TEMPERATURE (

°C)

NPN (CMPT3904)

PNP (CMPT3906)

INTERNAL

Typical Operating Characteristics

Multichannel Remote/Local

Temperature Sensors

4

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

Note 1: Guaranteed by design, but not production tested.

Note 2: Quantization error is not included in specifications for temperature accuracy. For example, if the MAX1668/MAX1805/

MAX1989 device temperature is exactly +66.7°C, the ADC may report +66°C, +67°C, or +68°C (due to the quantization

error plus the +0.5°C offset used for rounding up) and still be within the guaranteed ±1°C error limits for the +60°C to

+100°C temperature range. See Table 2.

Remote-Diode Selection section for remote-diode forward-voltage requirements.

Note 4: The SMBus logic block is a static design that works with clock frequencies down to DC. While slow operation is possible, it

violates the 10kHz minimum clock frequency and SMBus specifications, and can monopolize the bus.

Note 5: Note that a transition must internally provide at least a hold time in order to bridge the undefined region (300ns max) of

Note 6: Specifications from -55°C to +125°C are guaranteed by design, not production tested.

CONDITIONS

UNITS

MIN

TYP

MAX

PARAMETER

Logic Input High Voltage

V

2.4

ALERT forced to 5.5V

µA

1

ALERT Output High Leakage

Current

µA

-2

+2

Logic Input Current

ALERT, SMBDATA forced to 0.4V

mA

6

Logic Output Low Sink Current

V

0.8

Logic Input Low Voltage

SMBus INTERFACE