OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

MAX6956ATL+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
General Description
The MAX6956 compact, serial-interfaced LED display
driver/I/O expander provide microprocessors with up to
28 ports. Each port is individually user configurable to
either a logic input, logic output, or common-anode
(CA) LED constant-current segment driver. Each port
configured as an LED segment driver behaves as a
digitally controlled constant-current sink, with 16 equal
current steps from 1.5mA to 24mA. The LED drivers are
suitable for both discrete LEDs and CA numeric and
alphanumeric LED digits.
Each port configured as a general-purpose I/O (GPIO)
can be either a push-pull logic output capable of sink-
ing 10mA and sourcing 4.5mA, or a Schmitt logic input
with optional internal pullup. Seven ports feature config-
urable transition detection logic, which generates an
interrupt upon change of port logic level. The MAX6956
is controlled through an I
2
C-compatible 2-wire serial
interface, and uses four-level logic to allow 16 I
2
C
addresses from only 2 select pins.
The MAX6956AAX and MAX6956ATL have 28 ports
and are available in 36-pin SSOP and 40-pin thin QFN
packages, respectively. The MAX6956AAI and
MAX6956ANI have 20 ports and are available in 28-pin
SSOP and 28-pin DIP packages, respectively.
For an SPI-interfaced version, refer to the MAX6957
data sheet. For a lower cost pin-compatible port
expander without the constant-current LED drive capa-
bility, refer to the MAX7300 data sheet.
Applications
Set-Top Boxes Bar Graph Displays
Panel Meters Industrial Controllers
White Goods System Monitoring
Automotive
Features
o 400kbps I
2
C-Compatible Serial Interface
o 2.5V to 5.5V Operation
o -40°C to +125°C Temperature Range
o 20 or 28 I/O Ports, Each Configurable as
Constant-Current LED Driver
Push-Pull Logic Output
Schmitt Logic Input
Schmitt Logic Input with Internal Pullup
o 11µA (max) Shutdown Current
o 16-Step Individually Programmable Current
Control for Each LED
o Logic Transition Detection for Seven I/O Ports
MAX6956
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port LED Display Driver and I/O Expander
________________________________________________________________
Maxim Integrated Products
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V+
AD1
SCL
SDA
P31
P30
P22
P29
P28
P27
P26
P25
P24
P23
P21
P20
P19
P18
P17
P16
P15
P14
P13
P12
AD0
GND
GND
ISET
SSOP/DIP
TOP VIEW
MAX6956
Pin Configurations
19-2414; Rev 4; 6/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Typical Operating Circuit appears at end of data sheet.
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX6956ANI+ -40°C to +125°C 28 DIP
MAX6956AAI+ -40°C to +125°C 28 SSOP
MAX6956AAX+ -40°C to +125°C 36 SSOP
MAX6956ATL+ -40°C to +125°C 40 Thin QFN-EP*
MAX6956AAX/V -40°C to +125°C 36 SSOP
MAX6956AAX/V+T -40°C to +125°C 36 SSOP
Pin Configurations continued at end of data sheet.
/V denotes an automotive qualified part.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*
EP = Exposed pad.
EVALUATION KIT
AVAILABLE
MAX6956
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port LED Display Driver and I/O Expander
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage (with Respect to GND)
V+ .............................................................................-0.3V to +6V
SCL, SDA, AD0, AD1................................................-0.3V to +6V
All Other Pins................................................-0.3V to (V+ + 0.3V)
P4–P31 Current ................................................................±30mA
GND Current .....................................................................800mA
Continuous Power Dissipation
28-Pin PDIP (derate 14.3mW/°C above T
A
= +70°C) 1143mW
28-Pin SSOP (derate 9.1mW/°C above T
A
= +70°C)...727mW
36-Pin SSOP (derate 11.8mW/°C above T
A
= +70°C) ...941mW
40-Pin TQFN (derate 26.3mW/°C above T
A
= +70°C) 2105mW
Operating Temperature Range
(T
MIN
to T
MAX
) ...............................................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Soldering Temperature (reflow)
Lead(Pb)-free packages...............................................+260°C
Packages containing lead(Pb)......................................+240°C
ELECTRICAL CHARACTERISTICS
(
Typical Operating Circuit
, V+ = 2.5V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage V+ 2.5 5.5 V
T
A
= +25°C 5.5 8
T
A
= -40°C to +85°C 10
Shutdown Supply Current I
SHDN
All digital inputs at V+
or GND
T
A
= T
MIN
to T
MAX
11
µA
T
A
= +25°C 180 230
T
A
= -40°C to +85°C 250
Operating Supply Current I
GPOH
All ports programmed
as outputs high, no
load, all other inputs at
V+ or GND
T
A
= T
MIN
to T
MAX
270
µA
T
A
= +25°C 170 210
T
A
= -40°C to +85°C 230
Operating Supply Current I
GPOL
All ports programmed
as outputs low, no
load, all other inputs at
V+ or GND
T
A
= T
MIN
to T
MAX
240
µA
T
A
= +25°C 110 135
T
A
= -40°C to +85°C 140
Operating Supply Current I
LED
Al l p or ts p r og r am m ed
as LE D outp uts, al l LE D s
off, no l oad , al l other
i np uts at V + or GN D T
A
= T
MIN
to T
MAX
145
µA
INPUTS AND OUTPUTS
Logic-High Input Voltage
Port Inputs
V
IH
0.7
✕
V+
V
Logic-Low Input Voltage
Port Inputs
V
IL
0.3
✕
V+
V
Input Leakage Current I
IH
, I
IL
GPIO inputs without pullup,
V
PORT
= V+ to GND
-100 ±1 +100 nA
V+ = 2.5V 12 19 30
GPIO Input Internal Pullup to V+ I
PU
V+ = 5.5V 80 120 180
µA
Hysteresis Voltage GPIO Inputs ∆V
I
0.3 V
GPIO outputs, I
SOURCE
= 2mA, T
A
= -40°C to
+85°C
V+ -
0.7
Output High Voltage V
OH
GPIO outputs, I
SOURCE
= 1mA, T
A
= T
MIN
to
T
MAX
(Note 2)
V+ -
0.7
V
Port Sink Current I
OL
V
PORT
= 0.6V 2 10 18 mA
Output Short-Circuit Current I
OLSC
Port configured output low, shorted to V+ 2.75 11 20 mA
MAX6956
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port LED Display Driver and I/O Expander
_______________________________________________________________________________________ 3
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.
ELECTRICAL CHARACTERISTICS (continued)
(
Typical Operating Circuit
, V+ = 2.5V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V+ = 2.5V, V
LED
= 2.3V at maximum LED
current
9.5 13.5 18
V+ = 3.3V, V
LED
= 2.4V at maximum LED
current (Note 2)
18.5 24 27.5
Port Drive LED Sink Current,
Port Configured as LED Driver
I
DIGIT
V+ = 5.5V, V
LED
= 2.4V at maximum LED
current
19 25 30
mA
V+ = 2.5V, V
OUT
= 0.6V at maximum sink
current
18.5 23 28
Port Drive Logic Sink Current,
Port Configured as LED Driver
I
DIGIT_SC
V+ = 5.5V, V
OUT
= 0.6V at maximum sink
current
19 24 28
mA
Input High-Voltage SDA, SCL,
AD0, AD1
V
IH
0.7
✕
V+
V
Input Low-Voltage SDA, SCL,
AD0, AD1
V
IL
0.3
✕
V+
V
Input Leakage Current SDA, SCL I
IH
, I
IL
-50 50 nA
Input Capacitance (Note 2) 10 pF
Output Low-Voltage SDA V
OL
I
SINK
= 6mA 0.4 V
TIMING CHARACTERISTICS (Figure 2)
(V+ = 2.5V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Serial Clock Frequency f
SCL
400 kHz
Bus Free Time Between a STOP
and a START Condition
t
BUF
1.3 µs
Hold Time (Repeated) START
Condition
t
HD
,
STA
0.6 µs
Repeated START Condition
Setup Time
t
SU
,
STA
0.6 µs
STOP Condition Setup Time t
SU
,
STO
0.6 µs
Data Hold Time t
HD
,
DAT
(Note 3) 15 900 ns
Data Setup Time t
SU
,
DAT
100 ns
SCL Clock Low Period t
LOW
1.3 µs
SCL Clock High Period t
HIGH
0.7 µs
Rise Time of Both SDA and SCL
Signals, Receiving
t
R
(Notes 2, 4)
20 +
0.1C
b
300 ns
Fall Time of Both SDA and SCL
Signals, Receiving
t
F
(Notes 2, 4)
20 +
0.1C
b
300 ns
Fall Time of SDA Transmitting t
F,TX
(Notes 2, 5)
20 +
0.1C
b
250 ns
Pulse Width of Spike Suppressed t
SP
(Notes 2, 6) 0 50 ns
Capacitive Load for Each Bus
Line
C
b
(Note 2) 400 pF
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

MAX6956ATL+T

Mfr. #:
Buy MAX6956ATL+T
Manufacturer:
Maxim Integrated
Description:
LED Display Drivers 2.5-5.5V 20/28Port LED Display Driver
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet