MAX6947 Maxim Integrated Products, MAX6947 Datasheet - Page 4

• Manufacturer Part Number: MAX6947
• Description: Constant-Current LED Drivers and I/O Expanders
• Manufacturer: Maxim Integrated Products

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10-Port, Constant-Current LED Drivers and
I/O Expanders with PWM Intensity Control
TIMING CHARACTERISTICS (Figure 8)
(V
4
Note 1: All parameters are tested at T
Note 2: Guaranteed by design.
Note 3: Port current is factory trimmed to meet a median sink current of 20mA and 10mA over all ports. The ∆I
Note 4: A master device must provide a hold time of at least 300ns for the SDA signal (referred to V
Note 5: C
Note 6: I
Note 7: Guaranteed by design. Input filters on the SDA and SCL inputs suppress noise spikes of less than 50ns.
Internal PWM Clock Frequency
External PWM Clock Frequency
Serial-Clock Frequency
Bus Free Time Between a STOP and
a START Condition
Hold Time, (Repeated) START
Condition
Repeated START Condition Setup
Time
STOP Condition Setup Time
Data Hold Time
Data Setup Time
SCL Clock Low Period
SCL Clock High Period
Rise Time of Both SDA and SCL
Signals, Receiving
Fall Time of Both SDA and SCL
Signals, Receiving
Fall Time of SDA Transmitting
Pulse Width of Spike Supressed
Capacitive Load for Each Bus Line
RST Pulse Width
RST Rising Edge to
MAX6946/MAX6947 ACK to Cancel
Reset Run
RST Rising Edge to
MAX6946/MAX6947 ACK to Ensure
Reset Run
DD
_______________________________________________________________________________________
= 2.25V to 3.6V, T
guarantees current matching between parts.
bridge the undefined region of SCL’s falling edge.
SINK
b
= total capacitance of one bus line in picoFarads; t R and t F are measured between 0.3 x V
PARAMETER
≤ 6mA.
A
= T
MIN
to T
MAX
A
= +25°C. Specifications over temperature are guaranteed by design.
, unless otherwise noted. Typical values are at V
SYMBOL
t
t
t
t
t
t
t
HD, STA
SU, STO
HD, DAT
SU, DAT
RSTRUN
RSTRUN
SU, STA
t
t
t
f
t
t
HIGH
f
LOW
F, TX
OSC
SCL
BUF
t
C
INT
t
t
t
SP
W
R
F
b
(Note 4)
(Notes 2, 5)
(Notes 2, 5)
(Notes 2, 6)
(Note 7)
(Note 2)
Reset Run enabled, internal oscillator
enabled
Reset Run enabled, internal oscillator
enabled
CONDITIONS
DD
= 3.3V, T
MIN
180
1.3
0.6
0.6
0.6
1.3
0.7
0.1
5.6
23
IL
A
of the SCL signal) in order to
DD
= +25°C.) (Note 1)
+ 0.1C
+ 0.1C
+ 0.1C
and 0.7 x V
TYP
32
20
20
20
50
OUT
b
b
b
specification
MAX
DD
100
400
300
300
250
400
0.9
3.0
42
.
UNITS
kHz
kHz
kHz
ms
ms
pF
µs
µs
µs
µs
µs
ns
µs
µs
ns
ns
ns
ns
µs