MAXIM MAX7322 Technical data
General Description
The MAX7322 2-wire serial-interfaced peripheral features
four push-pull outputs and four input ports with selectable
internal pullups. Input ports are overvoltage protected to
+6V and feature transition detection with interrupt output.
The four input ports are continuously monitored for state
changes (transition detection). The interrupt is latched,
allowing detection of transient changes. Any combination
of inputs can be selected using the interrupt mask to
assert the open-drain INT output. When the MAX7322 is
subsequently accessed through the serial interface, any
pending interrupt is cleared.
The four push-pull outputs are rated to sink 20mA, and
are capable of driving LEDs.
The RST input clears the serial interface, terminating any
I
2
C communication to or from the MAX7322.
The MAX7322 uses two address inputs with four-level
logic to allow 16 I
2
C slave addresses. The slave address
also sets the power-up default logic state for the four output ports, and enables or disables internal 40kΩ pullups
for the input ports.
The MAX7322 is one device in a family of pin-compatible
port expanders with a choice of input ports, open-drain
I/O ports, and push-pull output ports (see Table 1).
The MAX7322 is available in 16-pin QSOP and TQFN
packages, and is specified over the -40°C to +125°C
automotive temperature range.
Applications
Features
♦ 400kHz I2C Serial Interface
♦ +1.71V to +5.5V Operation Voltage
♦ 4 Push-Pull Output Ports Rated at 20mA Sink
Current
♦ 4 Input Ports with Maskable, Latching Transition
Detection
♦ Input Ports are Overvoltage Protected to +6V
♦ Transient Changes are Latched, Allowing
Detection Between Read Operations
♦ INT Output Alerts Change on Any Selection of
Inputs
♦ AD0 and AD2 Inputs Select from 16 Slave
Addresses
♦ Low 0.6µA (typ) Standby Current
♦ -40°C to +125°C Operating Temperature Range
MAX7322
I2C Port Expander with
4 Push-Pull Outputs and 4 Inputs
________________________________________________________________ Maxim Integrated Products 1
19-3787; Rev 1; 9/06
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
Ordering Information
Typical Application Circuit and Functional Diagram appear
at end of data sheet.
Cell Phones
SAN/NAS
Servers
Notebooks
Satellite Radio
Automotive
Selector Guide
+Denotes lead-free package.
*EP = Exposed paddle.
Pin Configurations
Pin Configurations continued at end of data sheet.
TOP VIEW
SDA
AD0
RST
SCL
12 10 9
13
14
15
*EP
16
+
13V+4
AD2
(3mm x 3mm)
11
MAX7322
2
O0 INT
TQFN
O7
O6
I5
8
I4
7
GND
6
I3
5
I2
O1
PART
MAX7322AEE+
MAX7322ATE+
TEMP
RANGE
-40°C to
+125°C
-40°C to
+125°C
PINPACKAGE
16 QSOP — E16-4
16 TQFN-EP*
(3mm x 3mm)
TOP
MARK
ADD T1633-4
PKG
CODE
PART INPUTS
MAX7319 8 Yes — —
MAX7320 — — — 8
MAX7321 Up to 8 — Up to 8 —
MAX7322 4 Yes — 4
MAX7323 Up to 4 — Up to 4 4
MAX7328 Up to 8 — Up to 8 —
MAX7329 Up to 8 — Up to 8 —
INTERRUPT
MASK
OPENDRAIN
OUTPUTS
PUSH-PULL
OUTPUTS
MAX7322
I2C Port Expander with
4 Push-Pull Outputs and 4 Inputs
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.
(All voltages referenced to GND.)
Supply Voltage V+....................................................-0.3V to +6V
SCL, SDA, AD0, AD2, RST, INT, I2–I5......................-0.3V to +6V
O0, O1, O6, O7 .................................................-0.3 to V+ + 0.3V
O0, O1, O6, O7 Output Current........................................±25mA
SDA Sink Current ............................................................... 10mA
INT Sink Current..................................................................10mA
Total V+ Current..................................................................50mA
Total GND Current ...........................................................100mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW
16-Pin TQFN (derate 15.6mW/°C above +70°C) .......1250mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
DC ELECTRICAL CHARACTERISTICS
(V+ = +1.71V to +5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Supply Voltage V+ 1.71 5.50 V
Power-On Reset Voltage V
Standby Current
(Interface Idle)
Supply Current
(Interface Running)
Input High Voltage
SDA, SCL, AD0, AD2, RST, I2–I5
Input Low Voltage
SDA, SCL, AD0, AD2, RST, I2–I5
Input Leakage Current
SDA, SCL, AD0, AD2, RST, I2–I5
Input Capacitance
SDA, SCL, AD0, AD2, RST, I2–I5
Output Low Voltage
O0, O1, O6, O7
Output High Voltage
O0, O1, O6, O7
Output Low Voltage SDA V
Output Low Voltage INT V
Port Input Pullup Resistor R
I
POR
I
STB
I
V
V
IH
V
OL
V
OH
OLSDAISINK
OLINTISINK
PU
V+ falling 1.6 V
SCL and SDA and other digital inputs at
V+
f
+
IH
IL
, I
IL
= 400kHz; other digital inputs at V+ 23 55 µA
SCL
V+ < 1.8V 0.8 x V+
V+ ≥ 1.8V 0.7 x V+
V+ < 1.8V 0.2 x V+
V+ ≥ 1.8V 0.3 x V+
SDA, SCL, AD0, AD2, RST, at V+ or
GND, internal pullup disabled
V+ = +1.71V, I
V+ = +2.5V, I
V+ = +3.3V, I
V+ = +5V, I
V+ = +1.71V, I
V+ = +2.5V, I
V+ = +3.3V, I
V+ = +5V, I
= 6mA 250 mV
= 5mA 130 250 mV
= 5mA 90 180
SINK
= 10mA 110 210
SINK
= 15mA 130 230
SINK
= 20mA 140 250
SINK
= 2mA V+ - 250 V+ - 30
SOURCE
= 5mA V+ - 360 V+ - 70
SOURCE
= 5mA V+ - 260 V+ - 100
SOURCE
= 10mA V+ - 360 V+ - 120
SOURCE
0.6 1.5 µA
-0.2 +0.2 µA
10 pF
25 40 55 kΩ
V
V
mV
mV
MAX7322
I2C Port Expander with
4 Push-Pull Outputs and 4 Inputs
_______________________________________________________________________________________ 3
PORT AND INTERRUPT INT TIMING CHARACTERISTICS
(V+ = +1.71V to +5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, TA= +25°C.) (Note 1)
TIMING CHARACTERISTICS
(V+ = +1.71V to +5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, TA= +25°C.) (Note 1)
Note 1: All parameters are tested at TA= +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) in order 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. tRand tFmeasured between 0.3 x V+ and 0.7 x V+ with I
SINK
≤ 6mA.
Note 5: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Port Output Data Valid t
Port Input Setup Time t
Port Input Hold Time t
INT Input Data Valid Time t
INT Reset Delay Time from STOP t
INT Reset Delay Time from
Acknowledge
PPV
PSU
PH
t
CL ≤ 100pF 4 µs
CL ≤ 100pF 0 µs
CL ≤ 100pF 4 µs
CL ≤ 100pF 4 µs
IV
CL ≤ 100pF 4 µs
IP
CL ≤ 100pF 4 µs
IR
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Serial Clock Frequency f
Bus Free Time Between a STOP
and a START Condition
Hold Time (Repeated) START
Condition
Repeated START Condition
Setup Time
STOP Condition Setup Time t
Data Hold Time t
Data Setup Time t
SCL Clock Low Period t
SCL Clock High Period t
Rise Time of Both SDA and SCL
Signals, Receiving
Fall Time of Both SDA and SCL
Signals, Receiving
Fall Time of SDA, Transmitting t
Pulse Width of Spike Suppressed t
Capacitive Load for Each Bus
Line
RST Pulse Width t
RST Rising to START Condition
Setup Time
t
HD, STA
t
SU, STA
SU, STO
HD, DAT
SU, DAT
SCL
t
BUF
LOW
HIGH
t
R
t
F
F,TX
SP
C
b
W
t
RST
1.3 µs
0.6 µs
0.6 µs
0.6 µs
(Note 2) 0.9 µs
100 ns
1.3 µs
0.7 µs
(Notes 3, 4)
(Notes 3, 4)
(Notes 3, 4)
(Note 5) 50 ns
(Note 3) 400 pF
500 ns
20 +
0.1C
20 +
0.1C
20 +
0.1C
1µs
400 kHz
300 ns
b
300 ns
b
250 ns
b
MAX7322
I2C Port Expander with
4 Push-Pull Outputs and 4 Inputs
4 _______________________________________________________________________________________
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
0
0.4
0.2
1.0
0.8
0.6
1.2
1.4
1.8
1.6
2.0
-40 -10 5-25 203550658095110125
STANDBY CURRENT vs. TEMPERATURE
MAX7322 toc01
TEMPERATURE (°C)
STANDBY CURRENT (μA)
V+ = +3.3V
V+ = +2.5V
V+ = +5.0V
V+ = +1.71V
f
SCL
= 0kHz
0
20
10
40
30
50
60
-40 -10 5 20-25 3550658095110125
SUPPLY CURRENT vs. TEMPERATURE
MAX7322 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
V+ = +3.3V
V+ = +5.0V
V+ = +1.71V
V+ = +2.5V
f
SCL
= 400kHz
OUTPUT VOLTAGE LOW
vs. TEMPERATURE
TEMPERATURE (°C)
OUTPUT VOLTAGE LOW (V)
MAX7322 toc03
-40 -25 -10 5 20 35 50 65 80 95 110 125
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
V+ = +3.3V
I
SINK
= 15mA
V+ = +5.0V
I
SINK
= 20mA
V+ = +2.5V
I
SINK
= 10mA
V+ = +1.71V
I
SINK
= 5mA
OUTPUT VOLTAGE HIGH
vs. TEMPERATURE
TEMPERATURE (°C)
OUTPUT VOLTAGE HIGH (V)
MAX7322 toc04
-40 -25 -10 5 20 35 50 65 80 95 110 125
0
1
2
3
4
5
6
V+ = +3.3V
I
SOURCE
= 5mA
V+ = +5.0V
I
SOURCE
= 10mA
V+ = +2.5V
I
SOURCE
= 5mA
V+ = +1.71V
I
SOURCE
= 2mA
Pin Description
PIN
QSOP TQFN
1, 3 15, 1 AD0, AD2
216 RST Reset Input. Active Low. Drive RST low to clear the 2-wire interface.
4, 5, 11, 12, 2, 3, 9, 10 O0, O1, O6, O7 Push-Pull Output Ports
6, 7, 9, 10 4, 5, 7, 8 I2–I5 Input Ports. I2 to I5 are CMOS-logic inputs protected to +6V.
8 6 GND Ground
13 11 INT Interrupt Output, Active Low. INT is an open-drain output.
14 12 SCL I2C-Compatible Serial Clock Input
15 13 SDA I2C-Compatible Serial Data I/O
16 14 V+ P osi ti ve S up p l y V ol tag e. Byp ass V + to G N D w i th a cer am i c cap aci tor of at l east 0.047µF.
— EP EP Exposed Paddle. Connect exposed pad to GND.
NAME FUNCTION
Address Inputs. Select device slave address with AD0 and AD2. Connect AD0 and
AD2 to either GND, V+, SCL, or SDA to give four logic combinations (see Table 2).
Detailed Description
MAX7319–MAX7329 Family Comparison
The MAX7319–MAX7323 family consists of five pincompatible, eight-port expanders. Each version is optimized for different applications. The MAX7328 and
MAX7329 are industry-standard parts.
The MAX7324–MAX7327 family consists of four pincompatible, 16-port expanders that integrate the functions of the MAX7320 and one of either MAX7319,
MAX7321, MAX7322, or MAX7323.
Functional Overview
The MAX7322 is a general-purpose port expander
operating from +1.71V to +5.5V supply that provides
four push-pull output ports with 20mA sink, 10mA
source drive capability, and four input ports that are
overvoltage protected to +6V independent of supply voltage. The MAX7322 is rated to sink a total of 100mA and
source a total of 50mA from all four combined outputs.
The MAX7322 is set to one of 16 I
2
C slave addresses
(0x60 to 0x6F) using address inputs AD2 and AD0, and
is accessed over an I
2
C serial interface up to 400kHz.
The RST input clears the serial interface in case of a
bus lockup, terminating any serial transaction to or from
the MAX7322.
MAX7322
I2C Port Expander with
4 Push-Pull Outputs and 4 Inputs
_______________________________________________________________________________________ 5
Table 1. MAX7319–MAX7329 Family Comparison
2
C
I
PART
8-PORT EXPANDERS
MAX7319 110xxxx 8 Yes — —
MAX7320 101xxxx — — — 8
SLAVE
ADDRESS
INPUTS
INPUT
INTERRUPT
MASK
OPENDRAIN
OUTPUTS
PUSH-
PULL
OUTPUTS
2
C DATA
I
WRITE
<I7–I0
interrupt
mask>
<O7–O0
port
outputs>
I2C DATA
READ
<I7–I0 port
inputs>
<I7–I0
transition
flags>
<O7-O0
port
inputs>
APPLICATION
Input-only versions:
8 input ports with
programmable latching
transition detection interrupt
and selectable pullups.
Offers maximum versatility
for automatic input
monitoring. An interrupt
mask selects which inputs
cause an interrupt on
transitions, and transition
flags identify which inputs
have changed (even
momentarily) since the
ports were last read.
Output-only versions:
8 push-pull outputs with
selectable power-up default
levels.
Push-pull outputs offer
faster rise time than opendrain outputs, and require
no pullup resistors.
MAX7322
I2C Port Expander with
4 Push-Pull Outputs and 4 Inputs
6 _______________________________________________________________________________________
Table 1. MAX7319–MAX7329 Family Comparison (continued)
2
PART
C
I
SLAVE
ADDRESS
INPUTS
INPUT
INTERRUPT
MASK
OPENDRAIN
OUTPUTS
PUSH-
PULL
OUTPUTS
2
C DATA
I
WRITE
I2C DATA
READ
APPLICATION
I/O versions:
8 open-drain I/O ports with
latching transition detection
interrupt and selectable
pullups.
MAX7321 110xxxx Up to 8 — Up to 8 —
MAX7322 110xxxx 4 Yes — 4
MAX7323 110xxxx Up to 4 — Up to 4 4
MAX7328
MAX7329
0100xxx
0111xxx
Up to 8 — Up to 8 —
<P7–P0
port
outputs>
<O7, O6
outputs,
I5–I2
interrupt
mask, O1,
O0
outputs>
<port
outputs>
<P7–P0
port
outputs>
<P7–P0
port
inputs>
<P7–P0
transition
flags>
<O7, O6,
I5–I2, O1,
O0 port
inputs>
<0, 0, I5–I2
transition
flags, 0, 0>
<O7, O6,
P5–P2, O1,
O0 port
inputs>
<0, 0,
P5–P2
transition
flags, 0, 0>
<P7–P0
port
inputs>
Open-drain outputs can
level shift the logic-high
state to a higher or lower
voltage than V+ using
external pullup resistors.
Any port can be used as an
input by setting the opendrain output to logic-high.
Transition flags identify
which inputs have changed
(even momentarily) since
the ports were last read.
4 input-only, 4 output-only
versions:
4 input ports with
programmable latching
transition detection interrupt
and selectable pullups;
4 push-pull outputs with
selectable power-up default
levels.
4 I/O, 4 output-only
versions:
4 open-drain I/O ports with
latching transition detection
interrupt and selectable
pullups.
4 push-pull outputs with
selectable power-up default
levels.
8 open-drain I/O ports with
nonlatching transition
detection interrupt and
pullups on all ports.
All ports power up as inputs
(or logic-high outputs).
Any port can be used as an
input by setting the opendrain output to logic-high.
Loading...