LM81CIMT-31 National Semiconductor, LM81CIMT-31 Datasheet - Page 5

• Manufacturer Part Number: LM81CIMT-31
• Description: Serial Interface ACPI-Compatible Microprocessor System
• Manufacturer: National Semiconductor

Symbol
DAC CHARACTERISTICS
FAN RPM-TO-DIGITAL CONVERTER
The following specifications apply for +2.8V
for T
DC Electrical Characteristics
R
C
L
L
A
= T
Resolution
DAC Error
DAC Error Temperature Sensitivity
DAC Error Power Supply Sensitivity
Output Load Resistance
Output Load Capacitance
Fan RPM Error
Full-scale Count
FAN1 and FAN2 Nominal Input
RPM (See Section 6.0 )
Internal Clock Frequency
J
= T
MIN
to T
MAX
Parameter
; all other limits T
DC
A
= T
V
(Continued)
+
J
= 25˚C. (Note 8)
+3.8V
V
V
+25˚C
−10˚C
−40˚C
Divisor = 1, Fan Count =
153 (Note 14)
Divisor = 2, Fan Count =
153 (Note 14)
Divisor = 3, Fan Count =
153 (Note 14)
Divisor = 4, Fan Count =
153 (Note 14)
+25˚C
−10˚C
−40˚C
+
O
DC
= 3.3V
= 1.25V
, R
5
S
Conditions
T
T
T
T
T
T
= 500 , unless otherwise specified. Boldface limits apply
A
A
A
A
A
A
+75˚C
+100˚C
+125˚C
+75˚C
+100˚C
+125˚C
(Note 9)
Typical
8800
4400
2200
1100
22.5
22.5
22.5
8
(Note 10)
Limits
62.5
20.2
24.8
19.1
25.9
100
625
±
±
±
255
1.5
±
20
18
27
10
15
20
5
ppm/˚C (max)
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%/V (max)
kHz (max)
kHz (max)
kHz (max)
mV (max)
kHz (min)
kHz (min)
kHz (min)
pF (max)
% (max)
% (max)
% (max)
% (max)
(Limits)
(max)
Units
RPM
RPM
RPM
RPM
Bits
(min)