Datasheet

MAX6979
16-Port, 5.5V Constant-Current LED Driver with
LED Fault Detection and Watchdog
4 _______________________________________________________________________________________
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(INTERFACE IDLE, ALL OUTPUTS OFF,
R
SET
= 720Ω)
MAX6979 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.04.53.5 4.0
2.75
3.00
3.25
3.50
3.75
4.00
4.25
4.50
2.50
3.0 5.5
T
A
= +125
°
C
T
A
= +85
°
C
T
A
= -40°C
T
A
= +25°C
4.0
4.6
4.4
4.2
4.8
5.0
5.2
5.4
5.6
5.8
6.0
3.0 4.03.5 4.5 5.0 5.5
MAX6979 toc02
SUPPLY VOLTAGE
(
V
)
SUPPLY CURRENT (mA)
T
A
= +125°C
T
A
= +85°C
T
A
= -40°C
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(INTERFACE IDLE, ALL OUTPUTS OFF,
R
SET
= 360Ω)
T
A
= +25°C
6
8
16
14
12
10
18
20
3.0 4.03.5 4.5 5.0 5.5
MAX6979 toc03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(INTERFACE IDLE, ALL OUTPUTS ON,
R
SET
= 720Ω)
T
A
= +125°C
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
3.3V TIMING CHARACTERISTICS
( Typical Operating Circuit , V+ = 3V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1 and 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 50 ns
DOUT Rise and Fall Time C
DOUT
= 10pF, 20% to 80% 12 ns
LE Setup Time t
LS
15 ns
LE Rising to OUT Rising Delay 120 ns
LE Rising to OUT Falling Delay 310 ns
C LK Ri si ng to O U T Ri si ng D el ay 120 ns
C LK Ri si ng to O U T Fal l i ng D el ay 330 ns
OE Rising to OUT Rising Delay t
OEH
120 ns
OE Falling to OUT Falling Delay t
OEL
330 ns
LED Output OUT Turn-On Fall
Time
t
f
80% to 20% 120 ns
LED Output OUT Turn-Off Rise
Time
t
r
20% to 80% 120 ns
Note 1: All parameters tested at T
A
= +25°C. Specifications overtemperature are guaranteed by design.
Note 2: See Figure 3.