MAX6680/MAX6681
±1°C Fail-Safe Remote/Local Temperature
Sensors with SMBus Interface
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Typical Operating Circuit, V
CC
= 3.0V to 5.5V, T
A
= -25°C to +125°C, unless otherwise specified. Typical values are at V
CC
= 3.3V and T
A
= +25°C.)
Note 1: T
A
= +25°C to +85°C.
Note 2: If both the local and the remote junction are below T
A
= -20°C, then V
CC
> 3.15V.
Note 3: Conversions done in extended mode. For legacy mode, current is approximately half.
Note 4: Timing specifications guaranteed by design.
Note 5: The serial interface resets when SMBCLK or SMBDATA is low for more than t
TIMEOUT
.
Note 6: A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SMBCLK’s falling edge.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CRIT0, CRIT1, ADD0, ADD1, RESET, INT_SEL, SENS_SEL
Logic Input Low Voltage V
IL
0.8 V
Logic Input High Voltage V
IH
2.4 V
Input Leakage Current I
LEAK
-1 +1 µA
(ALERT, OVERT)
Output Low Sink Current V
OL
= 0.4V 1 mA
Output High Leakage Current V
OH
= 5.5V 1 µA
SMBus INTERFACE (SMBCLK, SMBDATA, STBY)
Logic Input Low Voltage V
IL
0.8 V
V
CC
= 3.0V 2.2
Logic Input High Voltage V
IH
V
CC
= 5.5V 2.4
V
Input Leakage Current I
LEAK
V
IN
= GND or V
CC
±2 µA
Output Low Sink Current I
OL
V
OL
= 0.6V 6 mA
Input Capacitance C
IN
5pF
SMBus-COMPATIBLE TIMING (Note 5)
Serial Clock Frequency (Note 5) f
SCL
100 kHz
Bus Free Time Between STOP
and START Condition
t
BUF
4.7 µs
START Condition Setup Time 4.7 µs
Repeat START Condition Setup
Time
t
SU:STA
90% to 90% 50 ns
START Condition Hold Time t
HD:STA
10% of SMBDATA to 90% of SMBCLK 4 µs
STOP Condition Setup Time t
SU:STO
90% of SMDCLK to 90% of SMBDATA 4 µs
Clock Low Period t
LOW
10% to 10% 4.7 µs
Clock High Period t
HIGH
90% to 90% 4 µs
Data Setup Time (Note 6) t
HD:DAT
250 ns
Receive SCL/SDA Rise Time t
R
1µs
Receive SCL/SDA Fall Time t
F
300 ns
Pulse Width of Spike Suppressed t
SP
050ns
SMBus Timeout (Note 5) SMBDATA low period for interface reset 25 37 45 ms
(16 Seiten)
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