Datasheet

MAX6958/MAX6959
2-Wire Interfaced, 3V to 5.5V, 4-Digit,
9-Segment LED Display Drivers with Keyscan
4 _______________________________________________________________________________________
Typical Operating Characteristics
(V+ = 5V, LED forward voltage = 2.4V, T
A
= +25°C, unless otherwise noted.)
SCAN RATE (f
SCAN
)
vs. TEMPERATURE
MAX6958/59 toc01
TEMPERATURE (°C)
SCAN RATE (Hz)
1008040 600 20-20
760
765
770
775
780
785
790
795
800
755
-40 120
5.5V
5V
3V
4.5V
KEYSCAN DEBOUNCE TIME (t
DEBOUNCE
)
vs. TEMPERATURE
MAX6958/59 toc02
TEMPERATURE (
°
C)
KEYSCAN DEBOUNCE TIME (ms)
100806040200-20
40.5
41.0
41.5
42.0
42.5
40.0
-40 120
4.5V
5V
3V
5.5V
SCAN RATE (f
SCAN
)
vs. SUPPLY VOLTAGE
MAX6958/59 toc03
SUPPLY VOLTAGE (V)
SCAN RATE (Hz)
5.04.54.03.5
765
770
775
780
785
790
760
3.0 5.5
KEYSCAN DEBOUNCE TIME (t
DEBOUNCE
)
vs. SUPPLY VOLTAGE
MAX6958/59 toc04
SUPPLY VOLTAGE (V)
KEYSCAN DEBOUNCE TIME (ms)
5.04.54.03.5
40.6
40.8
41.0
41.2
41.4
41.6
41.8
42.0
42.2
40.4
3.0 5.5
SEGMENT SOURCE CURRENT
vs. SUPPLY VOLTAGE
MAX6958/59 toc05
SUPPLY VOLTAGE (V)
SEGMENT SOURCE CURRENT (mA)
5.255.004.75
5
10
15
20
25
0
4.50 5.50
V
LED
= 2.4V
SEGMENT SOURCE CURRENT
vs. SUPPLY VOLTAGE
MAX6958/59 toc06
SUPPLY VOLTAGE (V)
SEGMENT SOURCE CURRENT (mA)
4.54.03.5
5
10
15
20
25
0
3.0 5.0 5.5
V
LED
= 2V
WAVEFORM AT DIG0/SEG0,
FULL INTENSITY
MAX6958/59 toc07
V
DIG0
/
SEG0
1V/div
200µs/div
INPUT PULLUP CURRENT
vs. TEMPERATURE
MAX6958/59 toc08
TEMPERATURE (°C)
INPUT PULLUP CURRENT (µA)
1008040 600 20-20
5
10
15
20
25
30
35
40
45
0
-40 120
5.5V
5V
3V
4.5V