Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
CC
= 3.0V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C and V
CC
= 5V.)
PARAMETER
POWER SUPPLY (V
CC
)
Supply Voltage
Supply Current
OUTPUT (OUT)
Output Voltage Range
Output Sink Current
Output Source Current
TACHOMETER INPUTS (TACH_)
Tachometer Threshold
Tachometer Input Impedance
FEEDBACK (FB)
DAC Differential Nonlinearity
Useful DAC Resolution
Feedback Input Impedance
Input Low Voltage
Input High Voltage
Input Hysteresis
Pullup Resistor
Output Sink Current
R
FB
V
IL(GPIO_)
V
IH(GPIO_)
V
HYS
R
GPIO_
I
GPIO_
V
GPIO_
= 0.4V
10
V
CC
≤
3.6V
V
CC
> 3.6V
2
3
200
100
Guaranteed monotonicity on FB (Note 1)
Measured at FB (Note 1)
0 < VFB < 9V
70
100
5
8
150
0.8
LSB
bits
kΩ
V
TACH_
R
TACH_
5V fan, 0 < V
FB
< 4.5V
12V fan, 0 < V
FB
< 9V
0 < V
TACH
< 9V
V
FB
+ 0.5
V
FB
+ 1.0
70
100
V
FB
+1.5
V
FB
+3
150
V
kΩ
V
OUT
I
SINK
I
SOURCE
I
OUT
= ±100µA
V
OUT
= 0.5V
V
OUT
= V
CC
- 1.8V
0.3
10
50
V
CC
- 0.3
V
mA
mA
V
CC
I
CC
Full-on mode, I
OUT
= 0
3.0
5.5
10
V
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
GENERAL-PURPOSE INPUTS/OUTPUTS (GPIO_) (Note 2)
V
V
mV
kΩ
mA
2
Maxim Integrated
MAX6650/MAX6651
Fan-Speed Regulators and Monitors
with SMBus/I
2
C-Compatible Interface
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3.0V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C and V
CC
= 5V.)
PARAMETER
ADDRESS SELECT (ADD)
ADD Input Low Voltage
ADD Input High Voltage
ADD Input Leakage
ADD External Pulldown Resistor
to GND
ADD Pulldown Current
SMBus/I
2
C INTERFACE (SDA, SCL)
Data Output Sink Current
Input Leakage Current
Input Low Voltage
Input High Voltage
Input Hysteresis
V
IL
V
IH
V
HYS
V
CC
≤
3.6V
V
CC
> 3.6V
2
3
200
I
SDA
V
SDA
= 0.6V
0 < V
IN
< V
CC
6
±1
0.8
mA
µA
V
V
mV
V
IL(ADD)
V
IH(ADD)
I
LADD
R
ADD
I
ADD
Selects slave address 90h (Table 1)
Selects slave address 96h (Table 1)
Selects slave address 36h (Table 1) (Note 3)
Selects slave address 3Eh (Table 1)
V
ADD
= 0.5V (Note 4)
V
CC
- 0.05
-1
9.5
-80
0
10.5
-40
0.1
V
V
µA
kΩ
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
TIMING CHARACTERISTICS
(V
CC
= 3.0V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C and V
CC
= 5V.)
PARAMETER
TACHOMETERS
Glitch Rejection
GPIO2
(Note 2)
Clock Frequency
Clock Frequency Uncertainty
f
CLK
f
CLK
V
CC
= 5V
-10
0
1.3
0.6
1.3
0.6
(Note 5)
0
100
(Note 6)
(Note 6)
I
SINK
< 6mA (Note 6)
20 + 0.1C
B
(pF)
20 + 0.1C
B
(pF)
20 + 0.1C
B
(pF)
300
300
250
900
254
+10
400
kHz
%
kHz
µs
µs
µs
µs
µs
ns
ns
ns
ns
Minimum pulse duration
500
µs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SMBus/I
2
C INTERFACE (Figures 3, 4)
SCL Clock Frequency
f
SCL
Bus Free Time Between Stop
and Start Condition
Hold-Time Start Condition
Low Period of the SCL Clock
High Period of the SCL Clock
Data Hold Time
Data Setup Time
Rise-Time SDA/SCL Signal
(Receiving)
Fall-Time SDA/SCL Signal
(Receiving)
Fall-Time SDA Signal
(Transmitting)
t
BUF
t
HD:STA
t
LOW
t
HIGH
t
HD:DAT
t
SU:DAT
t
R
t
F
t
F
Maxim Integrated
3
MAX6650/MAX6651
Fan-Speed Regulators and Monitors
with SMBus/I
2
C-Compatible Interface
TIMING CHARACTERISTICS (continued)
(V
CC
= 3.0V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C and V
CC
= 5V.)
PARAMETER
Setup Time for Stop Condition
Pulse Width of Spike Suppressed
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
SYMBOL
t
SU:STO
t
SPIKE
CONDITIONS
MIN
0.6
0
50
TYP
MAX
UNITS
µs
ns
For proper measurement of V
FB
, connect OUT and FB as shown in the
Typical Operating Circuit.
GPIO2, GPIO3, and GPIO4 only in the MAX6651.
Guaranteed by design and not 100% production tested.
For R
ADD
component test purposes only.
Note that the transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SCL’s
falling edge.
Note 6:
C
B
is the total capacitance of one bus line in pF. Tested with C
B
= 400pF. Rise and fall times are measured between 0.3 x
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