MAX6620
Quad Linear Fan-Speed Controller
4
Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(T
A
= -40°C to +125°C, V
CC
= 3.0V to 5.5V, unless otherwise noted. Typical values are at T
A
= +25°C, V
CC
= 3.3V.) (Note 3)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
Maximum Receive SCL/SDA Fall
Time
t
F
300 ns
Minimum Receive SCL/SDA Fall
Time
t
F
(Note 7)
20 + 0.1
x C
B
ns
Transmit SDA Fall Time t
F
(Note 7)
20 + 0.1
x C
B
250 ns
Pulse Width of Suppressed Spike t
SP
(Note 8) 0 50 ns
Output Fall Time C
L
= 400pF, I
OUT
= 3mA 250 ns
SDA Time Low for Reset of Serial
Interface
t
TIMEOUT
(Note 9) 20 50 ms
Note 3: All parts will operate properly over the V
CC
supply voltage range of 3.0V to 5.5V.
Note 4: Guaranteed by design and characterization.
Note 5: All timing specifications are guaranteed by design.
Note 6: A master device must provide a hold time of at least 300ns for the SDA signal to bridge the undefined region of SCL’s falling edge.
Note 7: C
B
= total capacitance of one bus line in pF. Tested with C
B
= 400pF.
Note 8: Input filters on SDA and SCL suppress noise spikes less than 50ns.
Note 9: Holding the SDA line low for a time greater than t
TIMEOUT
will cause the devices to reset SDA to the idle state of the serial
bus communication (SDA set high).
t
HD,STA
t
HIGH
t
R
t
F
t
HD,STA
S Sr A
SCL
SDA
t
SU,STA
t
SU,STO
t
R
t
F
t
BUF
t
LOW
t
SU,DAT
t
HD,DAT
PS
Figure 1. I
2
C Serial Interface Timing
