Datasheet

(V+ = 3.3V, LED forward voltage = 2.4V, typical application circuit, T
A
= +25°C, unless otherwise noted.)
Note 1: All parameters tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
(Typical Operating Circuits, V+ = 2.7V 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
16 ns
CLK Pulse Width Low t
CL
16 ns
CS Fall to CLK 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
V+ = 3.0V to 5.5V 19
ns
V+ = 2.7V 25
DOUT Output Rise and Fall Times t
FT
C
LOAD
= 10pF, V+ = 3.0V to 5.5V 10 ns
Minimum CS Pulse High
t
CSW
19.5 ns
100ns/div
OSC: 500mV/div
OSC_OUT: 2V/div
MAX6954 toc03
OSC
0V
0V
OSC_OUT
INTERNAL OSCILLATOR WAVEFORM
AT OSC AND OSC_OUT PINS
R
SET
= 56kΩ
C
SET
= 22pF
INTERNAL OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
MAX6954 toc02
SUPPLY VOLTAGE (V)
OSCILLATOR FREQUENCY (MHz)
5.04.54.03.53.0
3.8
4.2
4.4
3.6
2.5 5.5
R
SET
= 56kΩ
C
SET
= 22pF
4.0
INTERNAL OSCILLATOR FREQUENCY
vs. TEMPERATURE
MAX6954 toc01
TEMPERATURE (°C)
OSCILLATOR FREQUENCY (MHz)
110805020-10
3.8
4.0
4.2
4.4
3.6
-40
R
SET
= 56kΩ
C
SET
= 22pF
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Maxim Integrated │ 4
MAX6954 4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
Typical Operating Characteristics
Timing Characteristics