LM81CIMT-3 National Semiconductor, LM81CIMT-3 Datasheet - Page 6

• Manufacturer Part Number: LM81CIMT-3
• Manufacturer: National Semiconductor

Specifications of LM81CIMT-3

• Monitored Voltage 1 (typ): 2.5/3.3/5/12V
• Battery Backup Switching: No
• Watchdog Timer: Yes
• Chip Enable Signals: No
• Manual Reset: No
• Package Type: TSSOP
• Operating Supply Voltage (min): 2.8V
• Operating Supply Voltage (max): 3.8V
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• Power Fail Detection: No
• Mounting: Surface Mount
• Pin Count: 24
• Lead Free Status / Rohs Status: Not Compliant

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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
Parameter
to T
MAX
; all other limits T
DC
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
A
+
O
= T
= 3.3V
= 1.25V
V
(Continued)
+
J
Conditions
= 25˚C. (Note 8)
T
T
T
T
T
T
+3.8V
A
A
A
A
A
A
+75˚C
+100˚C
+125˚C
+75˚C
+100˚C
+125˚C
DC
, R
6
S
= 500 , unless otherwise specified. Boldface limits apply
(Note 9)
Typical
8800
4400
2200
1100
22.5
22.5
22.5
100
0.5
8
LM81BIM
(Note 10)
Limits
±
±
20.2
24.8
19.1
25.9
±
±
±
±
625
255
±
62.5
20
18
27
125
10
10
15
20
5
LM81CIM
(Note 10)
Limits
±
0.725
20.2
24.8
19.1
25.9
±
±
±
100
625
255
±
62.5
20
18
27
10
15
20
5
ppm/˚C (max)
kHz (max)
kHz (max)
kHz (max)
mV (max)
mV (max)
kHz (min)
kHz (min)
kHz (min)
pF (max)
% (max)
% (max)
% (max)
% (max)
% (max)
% (max)
(Limits)
(max)
Units
RPM
RPM
RPM
RPM
Bits
(min)