19-3059; Rev 5; 6/11
16-Port I/O Expander with LED Intensity
Control, Interrupt, and Hot-Insertion Protection
General Description
The MAX7313 I
2
C-compatible serial interfaced periph-
eral provides microprocessors with 16 I/O ports. Each
I/O port can be individually configured as either an
open-drain current-sinking output rated at 50mA and
5.5V, or a logic input with transition detection. A 17th
port can be used for transition detection interrupt, or as
a general-purpose output. The outputs are capable of
driving LEDs, or providing logic outputs with external
resistive pullup up to 5.5V.
PWM current drive is integrated with 8 bits of control.
Four bits are global control and apply to all LED outputs
to provide coarse adjustment of current from fully off to
fully on with 14 intensity steps. Each output then has
individual 4-bit control, which further divides the global-
ly set current into 16 more steps. Alternatively, the cur-
rent control can be configured as a single 8-bit control
that sets all outputs at once.
The MAX7313 is pin and software compatible with the
MAX7311, PCA9535, and PCA9555.
Each output has independent blink timing with two blink
phases. All LEDs can be individually set to be on or off
during either blink phase, or to ignore the blink control.
The blink period is controlled by a register.
The MAX7313 supports hot insertion. All port pins, the
INT
output, SDA, SCL, and the slave-address inputs
ADO-2 remain high impedance in power-down (V+ =0V)
with up to 6V asserted upon them.
The MAX7313 is controlled through the 2-wire
I
2
C/SMBus serial interface, and can be configured to
any one of 64 I
2
C addresses.
o
2V to 3.6V Operation
o
Overall 8-Bit PWM LED Intensity Control
Global 16-Step Intensity Control
Individual 16-Step Intensity Controls
o
Two-Phase LED Blinking
o
High Output Current (50mA max Per Port)
o
Outputs are 5.5V-Rated Open Drain
o
Supports Hot Insertion
o
Inputs are Overvoltage Protected to 5.5V
o
Transition Detection with Interrupt Output
o
1.2µA (typ), 3.6µA (max) Standby Current
o
Small 4mm x 4mm TQFN Package
o
-40°C to +125°C Temperature Range
o
All Ports Can Be Configured as Inputs or Outputs
KIT
ATION
EVALU
E
BL
AVAILA
Features
o
400kbs, 2-Wire Serial Interface, 5.5V Tolerant
MAX7313
Ordering Information
PART
MAX7313ATG+
MAX7313AEG+
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
24 TQFN-EP*
24 QSOP
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed Pad.
Pin Configurations
AD0
P15
P14
P13
TOP VIEW
P12
14
P11
13
12 P10
11 P9
10 P8
Applications
SCL 19
18
17
16
15
LCD Backlights
LED Status Indication
Portable Equipment
Keypad Backlights
RGB LED Drivers
Notebook Computers
SDA 20
V+ 21
INT/O16 22
AD1 23
AD2 24
+
1
P0
2
P1
3
P2
4
P3
5
P4
*EP
MAX7313ATG
9
8
7
GND
P7
P6
6
P5
Typical Application Circuit appears at end of data sheet.
TQFN
4mm x 4mm
*CONNECT EP TO GND
Pin Configurations continued at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.
16-Port I/O Expander with LED Intensity
Control, Interrupt, and Hot-Insertion Protection
MAX7313
ABSOLUTE MAXIMUM RATINGS
Voltage (with respect to GND)
V+ .............................................................................-0.3V to +4V
SCL, SDA, AD0, AD1, AD2, P0–P15 ........................-0.3V to +6V
INT/O16
....................................................................-0.3V to +8V
DC Current on P0–P15,
INT/O16
........................................55mA
DC Current on SDA.............................................................10mA
Maximum GND Current ....................................................350mA
Continuous Power Dissipation (T
A
= +70°C)
24-Pin QSOP (derate 9.5mW/°C over +70°C)..............761mW
24-TQFN (derate 20.8mW/°C over +70°C) ................1666mW
Operating Temperature Range (TMIN to TMAX)-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
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.
ELECTRICAL CHARACTERISTICS
(Typical Operating Circuit, V+ = 2V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
= +25°C.)
(Note 1)
PARAMETER
Operating Supply Voltage
Output Load External Supply
Voltage
Standby Current
(Interface Idle, PWM Disabled)
SYMBOL
V+
V
EXT
SCL and SDA at V+; other
digital inputs at V+ or GND;
PWM intensity control disabled
SCL and SDA at V+; other
digital inputs at V+ or GND;
PWM intensity control enabled
f
SCL
= 400kHz; other digital
inputs at V+ or GND; PWM
intensity control disabled
f
SCL
= 400kHz; other digital
inputs at V+ or GND; PWM
intensity control enabled
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= T
MIN
to T
MAX
0.7
✕
V+
57
50
8.5
CONDITIONS
MIN
2
0
1.2
TYP
MAX
3.6
5.5
2.3
2.8
3.6
15.1
16.5
17.2
95.3
99.2
102.4
110.2
117.4
122.1
V
µA
µA
µA
µA
UNITS
V
V
I
+
Supply Current
(Interface Idle, PWM Enabled)
Supply Current
(Interface Running, PWM
Disabled)
Supply Current
(Interface Running, PWM
Enabled)
Input High Voltage
SDA, SCL, AD0, AD1, AD2,
P0–P15
Input Low Voltage
SDA, SCL, AD0, AD1, AD2,
P0–P15
Input Leakage Current
SDA, SCL, AD0, AD1, AD2,
P0–P15
Input Capacitance
SDA, SCL, AD0, AD1, AD2,
P0–P15
I
+
I
+
I
+
V
IH
V
IL
0.3
✕
V+
V
I
IH
, I
IL
Input = GND or V+
-0.2
+0.2
µA
8
pF
2
_______________________________________________________________________________________
16-Port I/O Expander with LED Intensity
Control, Interrupt, and Hot-Insertion Protection
ELECTRICAL CHARACTERISTICS (continued)
(Typical Operating Circuit, V+ = 2V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
= + 25°C.)
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
T
A
= +25°C
V+ = 2V, I
SINK
= 20mA
T
A
= -40°C to +85°C
T
A
= T
MIN
to T
MAX
Output Low Voltage
P0–P15,
INT/O16
T
A
= +25°C
V
OL
V+ = 2.5V, I
SINK
= 20mA
T
A
= -40°C to +85°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
V+ = 3.3V, I
SINK
= 20mA
Output Low-Voltage SDA
PWM Clock Frequency
V
OLSDA
f
PWM
I
SINK
= 6mA
32
T
A
= -40°C to +85°C
T
A
= T
MIN
to T
MAX
0.12
0.13
MIN
TYP
0.15
MAX
0.26
0.3
0.32
0.23
0.26
0.28
0.23
0.24
0.26
0.4
V
kHz
V
UNITS
MAX7313
TIMING CHARACTERISTICS
(Typical Operating Circuit, V+ = 2V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
= +25°C.)
(Note 1)
PARAMETER
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 Suppressed
Capacitive Load for Each Bus Line
SYMBOL
f
SCL
t
BUF
t
HD, STA
t
SU, STA
t
SU, STO
t
HD, DAT
t
SU, DAT
t
LOW
t
HIGH
t
R
t
F
t
F.TX
t
SP
C
b
(Notes 3, 4)
(Notes 3, 4)
(Notes 2, 3, 5)
(Notes 2, 6)
(Notes 2, 3)
(Note 2)
180
1.3
0.7
20 +
0.1C
b
20 +
0.1C
b
20 +
0.1C
b
50
400
300
300
250
1.3
0.6
0.6
0.6
0.9
CONDITIONS
MIN
TYP
MAX
400
UNITS
kHz
µs
µs
µs
µs
µs
ns
µs
µs
ns
ns
ns
ns
pF
_______________________________________________________________________________________
3
16-Port I/O Expander with LED Intensity
Control, Interrupt, and Hot-Insertion Protection
MAX7313
TIMING CHARACTERISTICS (continued)
(Typical Operating Circuit, V+ = 2V to 3.6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V+ = 3.3V, T
A
= +25°C.)
(Note 1)
PARAMETER
Interrupt Valid
Interrupt Reset
Output Data Valid
Input Data Setup Time
Input Data Hold Time
SYMBOL
t
IV
t
IR
t
DV
t
DS
t
DH
CONDITIONS
Figure 10
Figure 10
Figure 10
Figure 10
Figure 10
100
1
MIN
TYP
MAX
6.5
1
5
UNITS
µs
µs
µs
ns
µs
Note 1:
All parameters tested at T
A
= +25°C. Specifications over temperature are guaranteed by design.
Note 2:
A master device must provide a hold time of at least 300ns for the SDA signal (referred to V
IL
of the SCL signal) to bridge
the undefined region of SCL’s falling edge.
Note 3:
Guaranteed by design.
Note 4:
C
b
= total capacitance of one bus line in pF. t
R
and t
F
measured between 0.3 x V
DD
and 0.7 x V
DD
.
Note 5:
I
SINK
≤
6mA. C
b
= total capacitance of one bus line in pF. t
R
and t
F
measured between 0.3 x V
DD
and 0.7 x V
DD
.
Note 6:
Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
(PWM DISABLED; f
SCL
= 400kHz)
MAX7313 toc01
STANDBY CURRENT vs. TEMPERATURE
10
9
STANDBY CURRENT (µA)
8
7
6
5
4
3
2
1
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
V+ = 2V
PWM ENABLED
V+ = 2.7V
V+ = 3.6V
PWM ENABLED
PWM
V+ = 2V
V+ = 2.7V
PWM DISABLED PWM DISABLED DISABLED
V+ = 3.6V
PWM ENABLED
70
60
SUPPLY CURRENT (µA)
50
40
SUPPLY CURRENT vs. TEMPERATURE
(PWM ENABLED; f
SCL
= 400kHz)
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
MAX7313 toc02
MAX7313 toc03
V+ = 3.6V
SUPPLY CURRENT (µA)
V+ = 3.6V
V+ = 2.7V
V+ = 2V
V+ = 2.7V
30
20
10
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
V+ = 2V
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
4
_______________________________________________________________________________________
16-Port I/O Expander with LED Intensity
Control, Interrupt, and Hot-Insertion Protection
MAX7313
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
PORT OUTPUT LOW VOLTAGE WITH 50mA
LOAD CURRENT vs. TEMPERATURE
MAX7313 toc04
PORT OUTPUT LOW VOLTAGE WITH 20mA
LOAD CURRENT vs. TEMPERATURE
ALL OUTPUTS LOADED
PORT OUTPUT LOW VOLTAGE V
OL
(V)
MAX7313 toc05
PWM CLOCK FREQUENCY
vs. TEMPERATURE
MAX7313 toc06
0.6
PORT OUTPUT LOW VOLTAGE V
OL
(V)
0.5
V+ = 2.7V
0.4
0.3
0.2
0.1
0
V+ = 3.6V
V+ = 2V
0.6
0.5
0.4
0.3
0.2
0.1
0
1.050
1.025
PWM CLOCK FREQUENCY
1.000
0.975
0.950
0.925
0.900
NORMALIZED TO V+ = 3.3V, T
A
= +25°C
V+ = 2V
V+ = 3.6V
V+ = 2V
V+ = 2.7V
V+ = 2.7V
V+ = 3.6V
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
SCOPE SHOT OF 2 OUTPUT PORTS
MAX7313 toc07
SCOPE SHOT OF 2 OUTPUT PORTS
MAX7313 toc08
SINK CURRENT vs. V
OL
OUTPUT 1 0.30
2V/div
0.25
V
OL
(V)
0.20
V+ = 3.3V
0.15
V+ = 3.6V
MAX7313 toc09
MASTER INTENSITY SET TO 1/15
OUTPUT 1
2V/div
OUTPUT 1 INDIVIDUAL INTENSITY
SET TO 1/16
MASTER INTENSITY SET TO 14/15
0.35
V+ = 2V
V+ = 2.7V
OUTPUT 1 INDIVIDUAL INTENSITY
SET TO 1/16
OUTPUT 2
2V/div
OUTPUT 2 INDIVIDUAL INTENSITY
SET TO 15/16
2ms/div
OUTPUT 2 INDIVIDUAL INTENSITY
SET TO 14/15
2ms/div
OUTPUT 2
2V/div
0.10
0.05
0
0
10
ONLY ONE OUTPUT LOADED
20
30
40
50
SINK CURRENT (mA)
_______________________________________________________________________________________
5
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