M
4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and
28-Port LED Display Driver and I/O Expander
_______________________________________________________________________________________
3
Note 1:
All parameters tested at T
A
= +25
°
C. Specifications over temperature are guaranteed by design.
Note 2:
Guaranteed by design.
ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit, V+ = 2.5V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
I
OL
I
OLSC
CONDITIONS
MIN
2
2.75
TYP
10
11
MAX
18
20
UNITS
mA
mA
Port Sink Current
Output Short-Circuit Current
V
PORT
= 0.6V
Port configured output low, shorted to V+
V+ = 2.5V, V
LED
= 2.3V at maximum LED
current
9.5
13.5
18
V+ = 3.3V, V
LED
= 2.4V at maximum LED
current (Note 2)
18.5
24
27.5
Port Drive LED Sink Current,
Port Configured as LED Driver
I
DIGIT
V+ = 5.5V, V
LED
= 2.4V at maximum LED
current
19
25
30
mA
V+ = 2.5V, V
OUT
= 0.6V at maximum LED
current
18.5
23
28.0
Port Drive Logic Sink Current,
Port Configured as LED Driver
I
DIGIT_SC
V+ = 5.5V, V
OUT
= 0.6V at maximum LED
current
19
24
28
mA
V+
≤
3.3V
V+ > 3.3V
1.6
2
Input High-Voltage SCLK, DIN,
CS
V
IH
V
Input Low-Voltage SCLK, DIN,
CS
V
IL
0.6
V
Input Leakage Current SCLK,
DIN,
CS
I
IH
, I
IL
-50
+50
nA
Output High-Voltage DOUT
V
OH
I
SOURCE
= 1.6mA
V+ -
0.5
V
Output Low-Voltage DOUT
V
OL
I
SINK
= 1.6mA
0.4
V
TIMING CHARACTERISTICS (Figure 3)
(V+ = 2.5V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
t
CP
t
CH
t
CL
t
CSS
t
CSH
t
DS
t
DH
t
DO
t
CSW
CONDITIONS
MIN
38.4
19
19
9.5
0
9.5
0
TYP
MAX
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
CLK Clock Period
CLK Pulse Width High
CLK Pulse Width Low
CS
Fall to SCLK Rise Setup Time
CLK Rise to
CS
Rise Hold Time
DIN Setup Time
DIN Hold Time
Output Data Propagation Delay
Minimum
CS
Pulse High
C
LOAD
= 25pF
21
19
