Datasheet

MAX6978
8-Port, 5.5V Constant-Current LED Driver with
LED Fault Detection and Watchdog
_______________________________________________________________________________________ 3
5V TIMING CHARACTERISTICS
(Typical Operating Circuit, V+ = 4.5V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
CLK Clock Period t
CP
40 ns
CLK Pulse-Width High t
CH
19 ns
CLK Pulse-Width Low t
CL
19 ns
DIN Setup Time t
DS
4ns
DIN Hold Time t
DH
8ns
DOUT Propagation Delay t
DO
12 32 ns
DOUT Rise and Fall Time
t
DR
, t
DF
C
DOUT
= 10pF, 20% to 80% 10 ns
LE Pulse-Width High t
LW
20 ns
LE Pulse Width (Fault-Detection
Data Valid)
t
LF
20 ns
LE Setup Time t
LS
10 ns
LE Rising to OUT_ Rising Delay t
LRR
(Note 2) 100 ns
LE Rising to OUT_ Falling Delay t
LRF
(Note 2) 280 ns
CLK Rising to OUT_ Rising Delay
t
CRR
(Note 2) 100 ns
CLK Rising to OUT_ Falling Delay
t
CRF
(Note 2) 310 ns
OE Rising to OUT_ Rising Delay
t
OEH
100 ns
OE Falling to OUT_ Falling Delay
t
OEL
300 ns
LED Output OUT_ Turn-On Fall
Time
t
f
80% to 20% 200 ns
LED Output OUT_ Turn-Off Rise
Time
t
r
20% to 80% 120 ns