Datasheet

Typical Operating Characteristics
(Typical application circuit, V+ = 3.3V, LED forward voltage = 2.4V, scan limit set to 4 digits, T
A
= +25°C, unless otherwise noted.)
MAX6953
2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5
✕
7
Matrix LED Display Driver
4 _______________________________________________________________________________________
MAX6953 TIMING CHARACTERISTICS (continued)
(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
Fall Time of SDA Transmitting t
F
(Notes 2, 5)
20 +
0.1C
B
250
ns
Pulse Width of Spike Suppressed
t
SP
(Note 6) 0 50 ns
Capacitive Load for Each
Bus Line
C
B
(Note 2)
400
pF
Note 1: All parameters tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Note 2: Guaranteed by design.
Note 3: A master device must provide a hold time of at least 300ns for the SDA signal (referred to V
IL
of the SCL signal) in order to
bridge the undefined region of SCL’s falling edge.
Note 4: C
B
= total capacitance of one bus line in pF. t
R
and t
F
measured between 0.3V+ and 0.7V+.
Note 5: I
SINK
≤ 6mA. C
B
= total capacitance of one bus line in pF. t
R
and t
F
measured between 0.3V+ and 0.7V+.
Note 6: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
3.80
3.90
4.10
4.00
4.20
4.30
-40 0-20 20
40
60 80
INTERNAL OSCILLATOR
FREQUENCY vs. TEMPERATURE
MAX6953 toc01
TEMPERATURE (
°
C)
OSCILLATOR FREQUENCY (MHz)
V+ = 3.3V
V+ = 2.7V
V+ = 5V
INTERNAL OSCILLATOR FREQUENCY
vs. SUPPLY VOLTAGE
MAX6953 toc02
SUPPLY VOLTAGE (V)
OSCILLATOR FREQUENCY (MHz)
4.53.5
3.7
3.8
3.9
4.0
4.1
4.2
4.3
4.4
3.6
2.5 5.5
0
0.5
1.5
1.0
2.0
2.5
0
400
200
600
800
INTERNAL OSCILLATOR
WAVEFORM AT OSC (PIN 19 OR 21)
MAX6953 toc03
TIMELINE (ns)
VOLTAGE AT OSC (V)