Datasheet

MAX6970
8-Port, 36V Constant-Current LED Driver
4 _______________________________________________________________________________________
3.3V TIMING CHARACTERISTICS
(Typical Operating Circuit, V+ = 3V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1, 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CLK Clock Period t
CP
52 ns
CLK Pulse-Width High t
CH
24 ns
CLK Pulse-Width Low t
CL
24 ns
DIN Setup Time t
DS
4ns
DIN Hold Time t
DH
8ns
DOUT Propagation Delay t
DO
12 48 ns
DOUT Rise and Fall Time t
DR
, t
DF
C
DOUT
= 10pF, 20% to 80% 12 ns
LE Pulse-Width High t
LW
20 ns
LE Setup Time t
LS
15 ns
LE Rising to OUT_ Rising Delay t
LRR
(Note 3) 140 ns
LE Rising to OUT_ Falling Delay t
LRF
(Note 3) 310 ns
CLK Rising to OUT_ Rising Delay t
CRR
(Note 3) 140 ns
CLK Rising to OUT_ Falling Delay t
CRF
(Note 3) 340 ns
OE Rising to OUT_ Rising Delay t
OEH
(Note 3) 140 ns
OE Falling to OUT_ Falling Delay t
OEL
(Note 3) 330 ns
LED Output OUT_ Turn-On Fall
Time
t
f
80% to 20% (Note 3) 250 ns
LED Output OUT_ Turn-Off Rise
Time
t
r
20% to 80% (Note 3) 150 ns
Note 1: All parameters are tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Note 2: See Figure 3.
Note 3: A 65Ω pullup resistor is connected from OUT_ to 5.5V.
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
1.3
1.6
1.5
1.4
1.7
1.8
1.9
2.0
2.1
2.2
2.3
3.0 4.03.5 4.5 5.0 5.5
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(INTERFACE IDLE, ALL OUTPUTS OFF, R
SET
= 720Ω)
MAX6970 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
T
A
= +125°C
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
3.2
3.5
3.4
3.3
3.6
3.7
3.8
3.9
4.0
4.1
4.2
3.0 4.03.5 4.5 5.0 5.5
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(INTERFACE IDLE, ALL OUTPUTS OFF, R
SET
= 360Ω)
MAX6970 toc02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
T
A
= +125°C
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C
5
8
11
14
17
20
3.0 4.03.5 4.5 5.0 5.5
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(INTERFACE IDLE, ALL OUTPUTS ON, R
SET
= 720Ω)
MAX6970 toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
T
A
= +125°C
T
A
= -40°C
T
A
= +25°C
T
A
= +85°C