MAX6640 데이터 시트보기 (PDF) - Maxim Integrated
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MAX6640 Datasheet PDF : 21 Pages
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2-Channel Temperature Monitor with Dual
Automatic PWM Fan-Speed Controller
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3.0V to +3.6V, TA = 0°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +85°C.) (Note 1)
PARAMETER
DIGITAL INPUTS AND OUTPUTS
Output Low Voltage (Sink
Current) (OT, ALERT, FANFAIL,
THERM, SDA, PWM1, and PWM2)
Output High Leakage Current
(OT, ALERT, FANFAIL, THERM,
SDA, PWM1, and PWM2)
SYMBOL
VOL
IOH
CONDITIONS
ALERT, FANFAIL, THERM, OT
SDA ISINK = 6mA
PWM1, PWM2, ISINK = 4mA
MIN TYP MAX UNITS
0.4
V
0.4
1
µA
Logic-Low Input Voltage (SDA,
SCL, THERM, TACH1, TACH2)
VIL
0.8
V
Logic-High Input Voltage (SDA,
SCL, THERM, TACH1, TACH2)
VIH
VCC = 3.3V
2.1
V
Input Leakage Current (SDA,
SCL, THERM, TACH1, TACH2)
VIN = VCC or GND
1
µA
Input Capacitance
CIN
SMBus TIMING (Note 2)
5
pF
Serial Clock Frequency
Clock Low Period
Clock High Period
Bus Free Time Between Stop and
Start Condition
SMBus Start Condition Setup
Time
Start Condition Hold Time
Stop Condition Setup Time
Data Setup Time
Data Hold Time
SMBus Fall Time
SMBus Rise Time
SMBus Timeout
fSCL
tLOW
tHIGH
tBUF
(Note 3)
10% to 10%
90% to 90%
tSU:STA 90% of SMBCLK to 90% of SMBDATA
tHD:STO
tSU:STO
tSU:DAT
tHD:DAT
tF
tR
tTIMEOUT
10% of SDA to 10% of SCL
90% of SCL to 10% of SDA
10% of SDA to 10% of SCL
10% of SCL to 10% of SDA (Note 4)
10
100
kHz
4
µs
4.7
µs
4.7
µs
4.7
µs
4
µs
4
µs
250
ns
300
ns
300
ns
1000
ns
58
74
90
ms
Note 1: All parameters tested at a single temperature. Specifications are guaranteed by design.
Note 2: Timing specifications guaranteed by design.
Note 3: The serial interface resets when SCL is low for more than tTIMEOUT.
Note 4: A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SCL's falling edge.
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