lm80cimtx-5 National Semiconductor Corporation, lm80cimtx-5 Datasheet - Page 7

• Manufacturer Part Number: lm80cimtx-5
• Description: Serial Interface Acpi-compatible Microprocessor System Hardware Monitor
• Manufacturer: National Semiconductor Corporation

AC Electrical Characteristics
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: All voltages are measured with respect to GND, unless otherwise specified
Note 3: When the input voltage (V
The 20 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5 mA to four.
Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
allowable power dissipation at any temperature is P
Note 5: The human body model is a 100 pF capacitor discharged through a 1.5 k
directly into each pin.
Note 6: See the section titled “Surface Mount” found in any post 1986 National Semiconductor Linear Data Book for other methods of soldering surface mount
devices.
Note 7: Each input and output is protected by a nominal 6.5V breakdown voltage zener diode to GND; as shown below, input voltage magnitude up to 0.3V above
V
can occur if these diodes are forward biased by more than 50 mV. As an example, if V
conversions.
An x indicates that the diode exists.
Note 8: Typicals are at T
Note 9: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 10: TUE (Total Unadjusted Error) includes Offset, Gain and Linearity errors of the ADC.
Note 11: Total Monitoring Cycle Time includes temperature conversion, 7 analog input voltage conversions and 2 tachometer readings. Each input voltage
conversion takes 100 ms typical and 112 ms maximum. 8-plus sign Temperature resolution takes 100 ms typical and 112 ms maximum, while 11-bit plus sign takes
800 ms typical and 900 ms maximum. Fan tachometer readings take 20 ms typical, at 4400 rpm, and 200 ms max.
Note 12: The total fan count is based on 2 pulses per revolution of the fan tachometer output.
Note 13: Timing specifications are tested at the Serial Bus Input logic levels, V
INT_IN
CI
GPO
FAN1–FAN2
SCL
SDA
RST_OUT/OS
+
or 0.3V below GND will not damage the LM80. There are parasitic diodes that exist between the inputs and the power supply rails. Errors in the ADC conversion
Pin Name
D1
J
x
=T
A
=25˚C and represent most likely parametric norm.
D2
x
x
x
x
x
IN
) at any pin exceeds the power supplies (V
D3
x
x
x
x
x
x
D
FIGURE 2. ESD Protection Input Structure
= (T
J
max−T
(Continued)
A
NTEST_IN/
Reset_IN
IN0-IN6
BTI
INT
A1-A2
A0/NTEST_Out
)/
JA
.
Pin Name
IN
IN(0)
7
<
(GND or GNDA) or V
= 0.3 x V
resistor into each pin. The machine model is a 200 pF capacitor discharged
+
DS100040-5
is 4.50 V
+
D1
for a falling edge and V
x
x
x
x
x
DC
D2
J
x
x
x
x
x
max,
, input voltage must be
IN
>
V
D3
+
JA
x
x
x
x
x
x
), the current at that pin should be limited to 5 mA.
and the ambient temperature, T
IN(1)
=0.7 x V
4.55 V
+
for a rising edge.
DC
, to ensure accurate
A
. The maximum
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