MAX6978(2005_03) 查看數據表（PDF） - Maxim Integrated
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MAX6978
(Rev.:2005_03)
(Rev.:2005_03)
Maxim Integrated
MAX6978 Datasheet PDF : 13 Pages
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8-Port, 5.5V Constant-Current LED Driver with
LED Fault Detection and Watchdog
3.3V TIMING CHARACTERISTICS
(Typical Operating Circuit, V+ = 3V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.) (Note 1)
PARAMETER
CLK Clock Period
CLK Pulse-Width High
CLK Pulse-Width Low
DIN Setup Time
DIN Hold Time
DOUT Propagation Delay
DOUT Rise and Fall Time
LE Pulse-Width High
LE Pulse Width (Fault-Detection
Data Valid)
SYMBOL
tCP
tCH
tCL
tDS
tDH
tDO
tLW
CONDITIONS
CDOUT = 10pF, 20% to 80%
tLW
MIN TYP
52
24
24
4
8
12
20
20
LE Setup Time
tLS
15
LE Rising to OUT_ Rising Delay
LE Rising to OUT_ Falling Delay
CLK Rising to OUT_ Rising Delay
CLK Rising to OUT_ Falling Delay
OE Rising to OUT_ Rising Delay
OE Falling to OUT_ Falling Delay
tOEH
tOEL
LED Output OUT_ Turn-On Fall
Time
tf
80% to 20%
LED Output OUT_ Turn-Off Rise
Time
tr
20% to 80%
Note 1: All parameters tested at TA = +25°C. Specifications over temperature are guaranteed by design.
Note 2: See Figure 3.
MAX
48
10
100
310
100
330
100
330
200
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
120
ns
(TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(INTERFACE IDLE, ALL OUTPUTS
OFF, RSET = 720Ω)
3.3
3.2
TA = +85°C
TA = +125°C
3.1
3.0
2.9
2.8
2.7
TA = +25°C
2.6
TA = -40°C
2.5
3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(INTERFACE IDLE, ALL OUTPUTS
OFF, RSET = 360Ω)
5.2
5.1
5.0
TA = +85°C
4.9
TA = +125°C
4.8
4.7
4.6
4.5
4.4
TA = +25°C
4.3
TA = -40°C
4.2
3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(INTERFACE IDLE, ALL OUTPUTS
ON, RSET = 720Ω)
15
12
TA = +125°C
TA = +85°C
9
6
TA = -40°C
3
TA = +25°C
0
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
4 _______________________________________________________________________________________
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