LM64 datasheet(6/29 Pages) NSC

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AC Electrical Characteristics

The following specifications apply for V

DD = 3.0 VDC to 3.6 VDC, and all analog source impedance RS =50

Ω unless other-

wise specified in the conditions. Boldface limits apply for T

A =TMIN to TMAX; all other limits TA= +25˚C.

Symbol

Parameter

Conditions

Typical

(Note 7)

Limits

(Note 8)

Units

(Limit)

TACHOMETER ACCURACY

Fan Control Accuracy

±10

% (max)

Fan Full-Scale Count

65535

(max)

Fan Counter Clock Frequency

kHz

Fan Count Update Frequency

1.0

FAN PWM OUTPUT

Frequency Accuracy

±10

% (max)

Digital Electrical Characteristics

Symbol

Parameter

Conditions

Typical

(Note 7)

Limits

(Note 8)

Units

(Limit)

Logical High Input Voltage

2.1

V (min)

Logical Low Input Voltage

0.8

V (max)

Logical High Input Current

IN =VDD

0.005

+10

µA (max)

Logical Low Input Current

IN = GND

−0.005

−10

µA (max)

Digital Input Capacitance

SMBus Logical Electrical Characteristics

The following specifications apply for V

DD = 3.0 VDC to 3.6 VDC, and all analog source impedance RS =50

Ω unless other-

wise specified in the conditions. Boldface limits apply for T

A =TMIN to TMAX; all other limits TA = +25˚C.

Symbol

Parameter

Conditions

Typical

(Note 7)

Limits

(Note 8)

Units

(Limit)

SMBDAT OPEN-DRAIN OUTPUT

Logic Low Level Output Voltage

OL =4 mA

0.4

V (max)

High Level Output Current

OUT =VDD

0.03

µA (max)

SMBDAT, SMBCLK INPUTS

Logical High Input Voltage

2.1

V (min)

Logical Low Input Voltage

0.8

V (max)

HYST

Logic Input Hysteresis Voltage

400

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