MAX6954 데이터 시트보기 (PDF) - Maxim Integrated
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MAX6954
Maxim Integrated
MAX6954 Datasheet PDF : 39 Pages
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4-Wire Interfaced, 2.7V to 5.5V LED Display
Driver with I/O Expander and Key Scan
TIMING CHARACTERISTICS
(Typical Operating Circuits, V+ = 2.7V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP
TIMING CHARACTERISTICS
CLK Clock Period
tCP
38.4
CLK Pulse Width High
tCH
16
CLK Pulse Width Low
tCL
16
CS Fall to CLK Rise Setup Time
tCSS
9.5
CLK Rise to CS Rise Hold Time
tCSH
0
DIN Setup Time
tDS
9.5
DIN Hold Time
tDH
0
Output Data Propagation Delay
V+ = 3.0V to 5.5V
tDO
V+ = 2.7V
DOUT Output Rise and Fall Times
Minimum CS Pulse High
tFT
tCSW
CLOAD = 10pF, V+ = 3.0V to 5.5V
19.5
Note 1: All parameters tested at TA = +25°C. Specifications over temperature are guaranteed by design.
MAX UNITS
ns
ns
ns
ns
ns
ns
ns
19
ns
25
10
ns
Typical Operating Characteristics
(V+ = 3.3V, LED forward voltage = 2.4V, typical application circuit, TA = +25°C, unless otherwise noted.)
INTERNAL OSCILLATOR FREQUENCY
vs. TEMPERATURE
4.4
RSET = 56kΩ
CSET = 22pF
4.2
INTERNAL OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
RSET = 56kΩ
4.4 CSET = 22pF
4.2
INTERNAL OSCILLATOR WAVEFORM
AT OSC AND OSC_OUT PINS
MAX6954 toc03
RSET = 56kΩ
CSET = 22pF
OSC
4.0
0V
4.0
3.8
3.6
-40 -10 20 50 80 110
TEMPERATURE (°C)
3.8
3.6
2.5
3.0 3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
OSC_OUT
0V
5.5
100ns/div
OSC: 500mV/div
OSC_OUT: 2V/div
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