DC Electrical Characteristics
(Continued)
The following specifications apply for +2.8 V
DC
≤V
+
≤
+3.8 V
DC
for LM80CIMT-3, +4.25 V
DC
≤V
+
≤
+5.75 V
DC
for LM80CIMT-5,
IN0-IN6 R
S
= 25Ω, unless otherwise specified.
Boldface limits apply for T
A
= T
J
= T
MIN
to T
MAX
;
all other limits T
A
= T
J
=
25˚C.(Note 7)
Symbol
Parameter
Conditions
Typical
(Note 8)
FAN RPM-to-DIGITAL CONVERTER
Fan RPM Error
+25˚C
≤
T
A
≤
+75˚C
−10˚C
≤
T
A
≤
+100˚C
−25˚C
≤
T
A
≤
+125˚C
Full-scale Count
FAN1 and FAN2 Nominal Input
RPM (See
Section 6.0)
Divisor = 1,
(Note 12)
Divisor = 2,
(Note 12)
Divisor = 3,
(Note 12)
Divisor = 4,
(Note 12)
Fan Count = 153
Fan Count = 153
Fan Count = 153
Fan Count = 153
8800
4400
2200
1100
22.5
22.5
20.2
24.8
−10˚C
≤
T
A
≤
+100˚C
19.1
25.9
−25˚C
≤
T
A
≤
+125˚C
DIGITAL OUTPUTS: A0/NTEST_OUT, INT
V
OUT(1)
Logical “1” Output Voltage
I
OUT
= +5.0 mA at
V
+
= +4.25V, I
OUT
= +3.0 mA
at V
+
= +2.8V
I
OUT
= −5.0 mA at
V
+
= +5.75V, I
OUT
= −3.0 mA
at V
+
= +3.8V
I
OUT
= − 5.0 mA
at V
+
= +5.75V,
I
OUT
= −3.0 mA at V
+
= +3.8V
V
OUT
= V
+
2.4
V (min)
22.5
18
27
Limits
(Note 9)
Units
(Limits)
% (max)
% (max)
% (max)
(max)
RPM
RPM
RPM
RPM
kHz (min)
kHz (max)
kHz (min)
kHz (max)
kHz (min)
kHz (max)
±
10
±
15
±
20
255
Internal Clock Frequency
+25˚C
≤
T
A
≤
+75˚C
V
OUT(0)
Logical “0” Output Voltage
0.4
V (max)
OPEN DRAIN OUTPUTS: GPO, RST_OUT/OS, CI
V
OUT(0)
Logical “0” Output Voltage
0.4
V (min)
I
OH
High Level Output Current
RST_OUT/OS, CI
Pulse Width
0.1
30
100
10
µA (max)
ms (min)
OPEN DRAIN SERIAL BUS OUTPUT: SDA
V
OUT(0)
Logical “0” Output Voltage
I
OUT
= −3.0 mA at
+
V = +5.75V, I
OUT
= −3.0 mA
at V
+
= +3.8V
V
OUT
= V
+
0.4
V (min)
I
OH
V
IN(1)
V
IN(0)
V
IN(1)
V
IN(0)
I
IN(1)
I
IN(0)
C
IN
High Level Output Current
Logical “1” Input Voltage
Logical “0” Input Voltage
Logical “1” Input Voltage
Logical “0” Input Voltage
Logical “1” Input Current
Logical “0” Input Current
Digital Input Capacitance
0.1
100
2.0
0.8
0.7 x V
+
0.3 x V
+
µA (max)
V (min)
V (max)
V (min)
V (max)
µA (min)
µA (max)
pF
www.national.com
DIGITAL INPUTS: A0/NTEST_Out, A1-A2, BTI, CI (Chassis Intrusion), INT_IN, and NTEST_IN/Reset_IN
SERIAL BUS INPUTS (SCL, SDA) and FAN TACH PULSE INPUTS (FAN1, FAN2)
ALL DIGITAL INPUTS Except for BTI
V
IN
= V
+
V
IN
= 0 V
DC
−0.005
0.005
20
5
−1
1
NSC [ NATIONAL SEMICONDUCTOR ]
