Datasheet

1°C Accurate Remote/Local Temperature
Sensor with SMBus Serial Interface
Maxim Integrated 3
MAX6654
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3V to +5.5V, T
A
= -55°C to +125°C, unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Logic Input Low Voltage V
IL
V
CC
= +3.0V to +5.5V
+0.8
V
CC
= +3.0V
+2.2
V
Logic Input High Voltage V
IH
V
CC
= +5.5V
+2.6
V
Input Leakage Current I
LEAK
V
IN
= GND or V
CC
±2µA
V
OL
= +0.6V +6
Output Low Sink Current I
OL
V
OL
= +0.4V +1
mA
Input Capacitance C
in
+5 pF
Output High Leakage Current V
OH
= +5.5V +1 µA
Serial Clock Frequency f
SCL
(Note 4) 0
+125
kHz
Bus Free Time Between STOP
and START Conditions
t
BUF
+4.7
µs
START Condition Setup Time
+4.7
µs
Repeat START Condition Setup
Time
t
SU:STA
90% to 90%
+50
µs
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 SMBCLK to 10% of SMBDATA662 +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
t
SU: DAT
90% of SMBDATA to 10% of SMBCLK
+250
ns
Data Hold Time
t
HD: DAT
(Note 5) 0 µs
Receive SCL/SDA Rise Time t
R
+1 µs
Receive SCL/SDA Fall Time t
F
+300
ns
SMBus Timeout
t
TIMEOUT
SMBDATA and SMBCLK time low for reset
of serial interface
+25
+40 ms
Note 1: +25°C ≤ T
A
≤ +85°C.
Note 2: If both the MAX6654 and the remote junction are below T
A
= -20°C, then V
CC
> 3.15V.
Note 3: The conversion time doubles for the extended resolution mode. This causes the average operating current to approximately
double.
Note 4: The serial interface resets when SMBCLK is low for more than t
TIMEOUT
.
Note 5: Note that a transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SMBCLK’s
falling edge.