LM87CIMT/NOPB National Semiconductor, LM87CIMT/NOPB Datasheet - Page 6

• Manufacturer Part Number: LM87CIMT/NOPB
• Description: IC INTERFACE SER MONITOR 24TSSOP
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM87CIMT/NOPB

• Function: Hardware Monitor
• Topology: ADC (Sigma Delta), Comparator, Fan Speed Control, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: I²C™/SMBus™
• Output Alarm: No
• Output Fan: Yes
• Voltage - Supply: 2.8 V ~ 3.8 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM87CIMT; *LM87CIMT/NOPB; LM87CIMT

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SERIAL BUS TIMING CHARACTERISTICS
AC Electrical Characteristics
The following specifications apply for +2.8 V
limits apply for T
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: The Absolute maximum input range for :
+2.5Vin - −0.3 V to (1.4 × V
+3.3Vin - −0.3 V to (1.8 × V
Note 4: When the input voltage (V
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 5: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
allowable power dissipation at any temperature is P
Note 6: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Note 7: 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 8: Parasitics and or ESD protection circuitry are shown in the figure below for the LM87's pins. The nominal breakdown voltage of the zener D3 is 6.5 V.
Care should be taken not to forward bias the parasitic diode, D1, present on pins: A0/NTEST_OUT, A1 and DACOut/NTEST_IN. Doing so by more than 50 mV
may corrupt a temperature or voltage measurement.
Symbol
t
TIMEOUT
t
t
C
t
rise
t
t
t
t
fall
1
2
3
4
5
L
A
SMBCLK (Clock) Period
SMBCLK and SMBData Rise Time
SMBCLK and SMBData Fall Time
Data In Setup Time to SMBCLK High
Data Out Stable After SMBCLK Low
SMBData Low Setup Time to SMBCLK Low (start)
SMBData High Hold Time After SMBCLK High
(stop)
SMBCLK low time required to reset the Serial Bus
Interface to the Idle State
Capacitive Load on SMBCLK and SMBData
= T
J
+
+
= T
+ 0.42 V or 6 V, whichever is smaller
+ 0.55 V or 6 V, whichever is smaller.
IN
MIN
) at any pin exceeds the power supplies (V
to T
MAX
Parameter
; all other limits T
D
= (T
DC
FIGURE 1. Serial Bus Timing Diagram
J
≤
max−T
V
+
≤
A
+3.8 V
)/θ
JA
A
.
= T
DC
J
on SMBCLK and SMBData, unless otherwise specified. Boldface
IN
6
= 25°C.
< GND or V
(Note
Conditions
IN
>V
+
17)
), the current at that pin should be limited to 5 mA. The 20 mA
J
max, θ
JA
(Note
Typical
and the ambient temperature, T
31
9)
(Note
Limits
300
100
100
300
100
100
2.5
25
35
80
1
10)
10099504
A
. The maximum
ms (max)
μs (max)
ns (max)
ns (max)
ms (min)
pF (max)
(Limits)
μs (min)
ns (min)
ns (min)
ns (min)
ns (min)
Units
ms