Datasheet

Note 1: All parameters tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Note 2: Guaranteed by design.
3(V+ = 2.5V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
(Typical Operating Circuit, V+ = 2.5V 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
38.4 ns
CLK Pulse Width High t
CH
19 ns
CLK Pulse Width Low t
CL
19 ns
CS Fall to SCLK Rise Setup Time t
CSS
9.5 ns
CLK Rise to CS Rise Hold Time t
CSH
0 ns
DIN Setup Time t
DS
9.5 ns
DIN Hold Time t
DH
0 ns
Output Data Propagation Delay t
DO
C
LOAD
= 25pF 21 ns
Minimum CS Pulse High t
CSW
19 ns
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Port Sink Current I
OL
V
PORT
= 0.6V 2 10 18 mA
Output Short-Circuit Current I
OLSC
Port congured output low, shorted to V+ 2.75 11 20 mA
Port Drive LED Sink Current,
Port Congured as LED Driver
I
PORT
V+ = 2.5V, V
LED
= 2.3V at maximum LED
current
9.5 13.5 18
mA
V+ = 3.3V, V
LED
= 2.4V at maximum LED
current (Note 2)
18.5 24 27.5
V+ = 5.5V, V
LED
= 2.4V at maximum LED
current
19 25 30
Port Drive Logic Sink Current,
Port Congured as LED Driver
I
PORT_SC
V+ = 2.5V, V
OUT
= 0.6V at maximum LED
current
18.5 23 28.0
mA
V+ = 5.5V, V
OUT
= 0.6V at maximum LED
current
19 24 28
Port LED Sink Current Matching ∆I
PORT
6 %
Input High-Voltage SCLK, DIN,
CS
V
IH
V+ ≤ 3.3V 1.6
V
V+ > 3.3V 2
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
www.maximintegrated.com
Maxim Integrated
3
MAX6957 4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and
28-Port LED Display Driver and I/O Expander
Timing Characteristics (Figure 3)
Electrical Characteristics (continued)