2-Wire Interfaced, 3V to 5.5V, 4-Digit,
9-Segment LED Display Drivers with Keyscan
MAX6958/MAX6959
Typical Operating Characteristics
(V+ = 5V, LED forward voltage = 2.4V, T
A
= +25擄C, unless otherwise noted.)
SCAN RATE (f
SCAN
)
vs. TEMPERATURE
MAX6958/59 toc01
KEYSCAN DEBOUNCE TIME (t
DEBOUNCE
)
vs. TEMPERATURE
MAX6958/59 toc02
SCAN RATE (f
SCAN
)
vs. SUPPLY VOLTAGE
MAX6958/59 toc03
800
795
790
SCAN RATE (Hz)
785
780
775
770
765
760
755
-40
-20
0
20
40
60
80
100 120
TEMPERATURE (擄C)
3V
4.5V
5V
5.5V
42.5
3V
KEYSCAN DEBOUNCE TIME (ms)
42.0
4.5V
41.5
5V
5.5V
41.0
790
785
SCAN RATE (Hz)
780
775
770
765
760
40.5
40.0
-40
-20
0
20
40
60
80
100 120
TEMPERATURE (擄C)
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
KEYSCAN DEBOUNCE TIME (t
DEBOUNCE
)
vs. SUPPLY VOLTAGE
MAX6958/59 toc04
SEGMENT SOURCE CURRENT
vs. SUPPLY VOLTAGE
MAX6958/59 toc05
SEGMENT SOURCE CURRENT
vs. SUPPLY VOLTAGE
MAX6958/59 toc06
42.2
42.0
KEYSCAN DEBOUNCE TIME (ms)
41.8
41.6
41.4
41.2
41.0
40.8
40.6
40.4
3.0
3.5
4.0
4.5
5.0
25
SEGMENT SOURCE CURRENT (mA)
25
SEGMENT SOURCE CURRENT (mA)
20
20
15
15
10
10
5
V
LED
= 2.4V
4.50
4.75
5.00
5.25
5.50
5
V
LED
= 2V
3.0
3.5
4.0
4.5
5.0
5.5
0
5.5
SUPPLY VOLTAGE (V)
0
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
WAVEFORM AT DIG0/SEG0,
FULL INTENSITY
MAX6958/59 toc07
INPUT PULLUP CURRENT
vs. TEMPERATURE
40
INPUT PULLUP CURRENT (碌A(chǔ))
35
30
25
20
15
10
5
0
3V
5.5V
5V
4.5V
MAX6958/59 toc08
45
V
DIG0
/
SEG0
1V/div
200碌s/div
-40
-20
0
20
40
60
80
100 120
TEMPERATURE (擄C)
4
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