Remote Temperature-Controlled Fan-Speed
Regulator with SPI-Compatible Interface
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3V to 5.5V, V
FAN
= 12V, T
A
= -40癈 to +125癈, unless otherwise specified. Typical values are at V
CC
= 3.3V and T
A
=
+25癈.) (Notes 1 and 2)
Note 1: T
A
= T
J
. This implies zero dissipation in pass transistor (no load, or fan turned off).
Note 2: All parameters are 100% production tested at a single temperature, unless otherwise indicated. Parameter values through
temperature are guaranteed by design.
Note 3: The fan control section of the MAX6661 and temperature comparisons use only 9 bits of the 11-bit temperature measure-
ment with a 0.5癈 LSB.
Note 4: Wide-range accuracy is guaranteed by design, not production tested.
Note 5: Guaranteed by design.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
INTERFACE PINS (SDIN, SC, CS, DOUT, ALERT, OVERT)
Serial Bus Maximum Clock
Frequency (Note 5)
SC
2.5
MHz
V
CC
= 3V
2.2
Logic Input High Voltage
V
CC
= 5.5V
2.4
V
Logic Input Low Voltage
V
CC
= 3V to 5V
0.8
V
Logic Output High-Voltage
DOUT
V
CC
= 3V, I
SOURCE
= 6mA (Note 5)
V
CC
-
0.4V
V
Logic Output Low-Voltage DOUT
V
CC
= 3V, I
SINK
= 6mA (Note 5)
0.4
V
Logic Output Low-Voltage
ALERT, OVERT
V
CC
= 3V, I
SINK
= 6mA (Note 5)
0.4
V
ALERT, OVERT Output
High Leakage Current
ALERT, OVERT forced to 5.5V
1
礎
Logic Input Current
Logic inputs forced to V
CC
or GND
-2
2
礎
SPI AC TIMING (Figure 5)
CS High to DOUT Three-State
t
TR
C
LOAD
= 100pF, R
GS
= 10k& (Note 5)
200
ns
CS to SC Setup Time
t
CSS
(Note 5)
200
ns
SC Fall to DOUT Valid
t
DO
C
LOAD
= 100pF
200
ns
DIN to SC Setup Time
t
DS
200
ns
DIN to SC Hold Time
t
DH
(Note 5)
200
ns
SC Period
t
CP
400
ns
SC High Time
t
CH
200
ns
SC Low Time
t
CL
200
ns
CS High Pulse Width
t
CSW
(Note 5)
400
ns
Output Rise Time
t
R
C
LOAD
= 100pF
10
ns
Output Fall Time
t
F
C
LOAD
= 100pF
10
ns
SC Falling Edge to CS Rising
t
SCS
(Note 5)
200
ns
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