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LM90 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM90
Description  3 Degree Celcious Accurate, Remote Diode and Local Digital Temperature Sensor with Two-Wire Interface
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM90 Datasheet(HTML) 6 Page - National Semiconductor (TI)

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SMBus DIGITAL SWITCHING CHARACTERISTICS
Unless otherwise noted, these specifications apply for V
DD=+3.0 Vdc to +3.6 Vdc, CL (load capacitance) on output lines = 80
pF. Boldface limits apply for T
A =TJ =TMIN to TMAX; all other limits TA =TJ = +25˚C, unless otherwise noted.
The switching characteristics of the LM90 fully meet or exceed the published specifications of the SMBus version 2.0. The fol-
lowing parameters are the timing relationships between SMBCLK and SMBData signals related to the LM90. They adhere to
but are not necessarily the SMBus bus specifications.
Symbol
Parameter
Conditions
Typical
Limits
Units
(Note 6)
(Note 7)
(Limit)
t
SU;STA
SMBus Repeated Start-Condition Setup
Time, SMBCLK High to SMBData Low
0.6
µs (min)
t
BUF
SMBus Free Time Between Stop and Start
Conditions
1.3
µs (min)
SMBus Communication
20033740
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating
the device beyond its rated operating conditions.
Note 2: When the input voltage (VI) at any pin exceeds the power supplies (VI < GND or VI > VDD), the current at that pin should be limited to 5 mA.
Parasitic components and or ESD protection circuitry are shown in the figure below for the LM90’s pins. The nominal breakdown voltage of D3 is 6.5 V. Care should
be taken not to forward bias the parasitic diode, D1, present on pins: D+, D−. Doing so by more than 50 mV may corrupt a temperature measurements.
Pin Name
PIN #
D1
D2
D3
D4
D5
D6
D7
R1
SNP
ESD CLAMP
V
DD
1
x
D+
2
x
x
xxx
x
D−
3
x
x
xxx
x
T_CRIT_A
4x
x
x
ALERT
6x
x
x
SMBData
7
x
x
x
SMBCLK
8
x
Note: An “x” indicates that the diode exists.
Note 3: See the URL ”http://www.national.com/packaging/“ for other recommendations and methods of soldering surface mount devices.
Note 4: Human body model, 100pF discharged through a 1.5k
Ω resistor. Machine model, 200pF discharged directly into each pin.
Note 5: Thermal resistance junction-to-ambient when attached to a printed circuit board with 2 oz. foil:
– MSOP-8 = 210˚C/W
Note 6: Typicals are at TA = 25˚C and represent most likely parametric norm.
20033713
FIGURE 1. ESD Protection Input Structure
www.national.com
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