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Temperature Monitors and
PWM Fan Controllers
_______________________________________________________________________________________   3
Note 1: Tested at +85
o
C. Values through the temperature range are guaranteed by design.
Note 2: Not production tested, guaranteed by design.
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +5.5V, T
A
= 0癈 to +125癈, unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +25癈.) (Note1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX    UNITS
Temperature Conversion Time
250
ms
Conversion Rate Timing Error
(Note 2)
25
25
%
High level
80
100
120
Remote-Diode Sourcing Current
Low level
8
10
12
礎
DXN Source Voltage
0.7
V
TACHOMETER Input Hysteresis
100
mV
Output Low Voltage (Sink Current)
V
OL
SDL, SDR, THERM, FAN_FAULT, SMBDATA,
PWM_OUT, V
CC
 = +3V, I
OUT
 = 6mA,
INT, V
CC
 = +3V, I
OUT
 = 4mA
0.4
V
Output High Leakage Current
I
OH
INT, SDL, SDR, THERM, FAN_FAULT,
SMBDATA, PWM_OUT
1
礎
Logic Low Input Voltage
V
IL
SMBDATA, SMBCLK, INT, THERM, TACH/AIN
0.8
V
3.0V
2.2
Logic High Input Voltage
V
IH
SMBDATA, SMBCLK, INT,
THERM, TACH/AIN
5.5V
2.6
V
Input Leakage Current
I
LEAK
SMBDATA, SMBCLK, INT, THERM;
V
IN
 = V
CC
 or GND
?
礎
Input Capacitance
C
IN
5
pF
SMBus TIMING
Serial Clock Frequency
f
SCLK
(Note 2)
10
100
kHz
Clock Low Period
t
LOW
10% to 10% (Note 2)
4
祍
Clock High Period
t
HIGH
90% to 90% (Note 2)
4.7
祍
Bus Free Time Between Stop and
Start Condition
t
BUF
(Note 2)
4.7
祍
SMBus Start Condition Setup
Time
t
SU:STA
90% of SMBCLK to 90% of SMBDATA (Note 2)
4.7
祍
Start Condition Hold Time
t
HD:STO
10% of SMBDATA to 10% of SMBCLK (Note 2)
4
祍
Stop Condition Setup Time
t
SU:STO
90% of SMBCLK to 10% of SMBDATA (Note 2)
4
祍
Data Setup Time
t
SU:DAT
10% of SMBDATA to 10% of SMBCLK (Note 2)
250
ns
Data Hold Time
t
HD:DAT
10% of SMBCLK to 10% of SMBDATA (Note 2)
300
ns
SMBus Fall Time
t
F
(Note 2)
300
ns
SMBus Rise Time
t
R
(Note 2)
1000
ns
SMBus Timeout
29
37
45
ms
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