Typical operating characteristics, Electrical characteristics (continued) – Rainbow Electronics MAX6641 User Manual
Page 3
MAX6641
SMBus-Compatible Temperature Monitor with
Automatic PWM Fan-Speed Controller
_______________________________________________________________________________________
3
Note 1: Timing specifications guaranteed by design.
Note 2: The serial interface resets when SMBCLK is low for more than t
TIMEOUT
.
Note 3: A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SMBCLK’s falling edge.
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +5.5V, T
A
= 0
°C to +125°C, unless otherwise noted. Typical values are at V
CC
= 3.3V, T
A
= +25
°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SMBus-COMPATIBLE TIMING (Note 1) (See Figures 2, 3)
Serial Clock Frequency
f
SCLK
(Note 2)
100
kHz
Clock Low Period
t
LOW
10% to 10%
4
µs
Clock High Period
t
HIGH
90% to 90%
4.7
µs
Bus Free Time Between Stop and
Start Condition
t
BUF
4.7
µs
Hold Time After (Repeated) Start
Condition
t
HD:STA
4
µs
S M Bus S tar t C ond i ti on S etup Ti m e
t
SU:STA
90% of SMBCLK to 90% of SMBDATA
4.7
µs
Start Condition Hold Time
t
HD:STO
10% of SMBDATA to 10% of SMBCLK
4
µs
Stop Condition Setup Time
t
SU:STO
90% of SMBCLK to 10% of SMBDATA
4
µs
Data Setup Time
t
SU:DAT
10% of SMBDATA to 10% of SMBCLK
250
ns
Data Hold Time
t
HD:DAT
10% of SMBCLK to 10% of SMBDATA
(Note 3)
300
ns
SMBus Fall Time
t
F
300
ns
SMBus Rise Time
t
R
1000
ns
SMBus Timeout
t
TIMEOUT
29
37
55
ms
Startup Time After POR
t
POR
500
ms
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25
°C, unless otherwise noted.)
OPERATING SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6641 toc01
SUPPLY VOLTAGE (V)
OPERATING SUPPLY CURRENT (
µ
A)
5.0
4.5
4.0
3.5
350
400
450
500
550
600
300
3.0
5.5
NO SMBus ACTIVITY
REMOTE TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE
MAX6641 toc02
TEMPERATURE (
°C)
TEMPERATURE ERROR (
°C)
100
75
25
50
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
-2.0
0
125
LOCAL TEMPERATURE ERROR
vs. DIE TEMPERATURE
MAX6641 toc03
TEMPERATURE (
°C)
TEMPERATURE ERROR (
°C)
100
75
50
25
-1
0
1
2
-2
0
125