LM81CIMTX-32 datasheet(5/32 Pages) NSC

Part #	LM81CIMTX-32

Description	Serial Interface ACPI-Compatible Microprocessor System

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Manufacturer	NSC [National Semiconductor (TI)]

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DC Electrical Characteristics (Continued)

The following specifications apply for +2.8V

DC ≤ V

+

≤ +3.8V

DC,RS = 500Ω, unless otherwise specified. Boldface limits apply

for T

A = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C. (Note 8)

Symbol

Parameter

Conditions

Typical

Limits

Units

(Note 9)

(Note 10)

(Limits)

DAC CHARACTERISTICS

Resolution

8

Bits

DAC Error

V

+ = 3.3V

±5

62.5

% (max)

mV (max)

DAC Error Temperature Sensitivity

100

ppm/˚C (max)

DAC Error Power Supply Sensitivity

1.5

%/V (max)

R

L

Output Load Resistance

V

O = 1.25V

625

Ω (min)

C

L

Output Load Capacitance

20

pF (max)

FAN RPM-TO-DIGITAL CONVERTER

Fan RPM Error

+25˚C

≤ T

A ≤ +75˚C

±10

% (max)

−10˚C

≤ T

A ≤ +100˚C

±15

% (max)

−40˚C

≤ T

A ≤ +125˚C

±20

% (max)

Full-scale Count

255

(max)

FAN1 and FAN2 Nominal Input

RPM (See

Section 6.0)

Divisor = 1, Fan Count =

153 (Note 14)

8800

RPM

Divisor = 2, Fan Count =

153 (Note 14)

4400

RPM

Divisor = 3, Fan Count =

153 (Note 14)

2200

RPM

Divisor = 4, Fan Count =

153 (Note 14)

1100

RPM

Internal Clock Frequency

+25˚C

≤ T

A ≤ +75˚C

22.5

20.2

kHz (min)

24.8

kHz (max)

−10˚C

≤ T

A ≤ +100˚C

22.5

19.1

kHz (min)

25.9

kHz (max)

−40˚C

≤ T

A ≤ +125˚C

22.5

18

27

kHz (min)

kHz (max)

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