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MAX7321AEE+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
General Description
The MAX7321 2-wire serial-interfaced peripheral fea-
tures eight open-drain I/O ports with selectable internal
pullups and transition detection. Any port may be used
as a logic input or an open-drain output. Ports are over-
voltage protected to +6V independent of supply voltage.
All I/O ports configured as inputs are continuously
monitored for state changes (transition detection).
State changes are indicated by the open-drain INT
output. The interrupt is latched, allowing detection of
transient changes. When the MAX7321 is subsequent-
ly accessed through the serial interface, any pending
interrupt is cleared.
The open-drain 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 MAX7321.
The MAX7321 uses two address inputs with four-level
logic to allow 16 I
2
C slave addresses. The slave
address also determines the power-up logic state for
the I/O ports, and enables or disables internal 40kΩ
pullups in groups of four ports.
The MAX7321 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 MAX7321 is available in 16-pin QSOP and TQFN
packages, and is specified over the automotive temper-
ature range (-40°C to +125°C).
Features
♦ 400kHz I
2
C Serial Interface
♦ +1.71V to +5.5V Operating Voltage
♦ 8 Open-Drain I/O Ports Rated to 20mA Sink Current
♦ I/O Ports Are Overvoltage Protected to +6V
♦ Any Port Can Be a Logic Input or an Open-Drain
Output
♦ Selectable I/O Port Power-Up Default Logic States
♦ Transient Changes Are Latched, Allowing Detection
Between Read Operations
♦ INT Output Alerts Change on Inputs
♦ AD0 and AD2 Inputs Select from 16 Slave
Addresses
♦ Low 0.6µA (typ) Standby Current
♦ -40°C to +125°C Operating Temperature
MAX7321
I
2
C Port Expander with 8 Open-Drain I/Os
________________________________________________________________ Maxim Integrated Products 1
19-3738; Rev 1; 4/06
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.
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
TOP
MARK
PKG
CODE
MAX7321AEE+
-40°C to
+125°C
16 QSOP —
E16-4
MAX7321ATE+
-40°C to
+125°C
16 TQFN-EP** ADC
T1633-4
Pin Configurations are continued at end of data sheet.
Typical Application Circuit and Functional Diagram appear
at end of data sheet.
Selector Guide
PART
INPUTS
INTERRUPT
MASK
OPEN-
DRAIN
OUTPUTS
PUSH-PULL
OUTPUTS
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
—
**EP = Exposed paddle.
+Denotes lead-free package.
Cell Phones
SAN/NAS
Servers
Notebooks
Satellite Radio
Automotive
Applications
Pin Configurations
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
AD0
V+
SDA
SCL
INT
P7
P6
P5
P4
MAX7321
QSOP
RST
AD2
P2
P0
P1
P3
GND
+
+
MAX7321
I
2
C Port Expander with 8 Open-Drain I/Os
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, P0–P7 ...................-0.3V to +6V
P0–P7 Sink 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
ELECTRICAL CHARACTERISTICS
(V+ = +1.71V to +5.5V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, T
A
= +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
POR
V+ falling 1.6 V
Standby Current
(Interface Idle)
I
STB
SCL and SDA and other digital inputs at V+ 0.6 1.5 µA
Supply Current
(Interface Running)
I
+
f
SCL
= 400kHz; other digital inputs at V+ 23 55 µA
V+ < 1.8V 0.8 x V+
Input High Voltage
SDA, SCL, AD0, AD2, RST, P0–P7
V
IH
V+ ≥ 1.8 0.7 x V+
V
V+ < 1.8V 0.2 x V+
Input Low Voltage
SDA, SCL, AD0, AD2, RST, P0–P7
V
IL
V+ ≥ 1.8V 0.3 x V+
V
Input Leakage Current
SDA, SCL, AD0, AD2, RST, P0–P7
I
IH
, I
IL
SDA, SCL, AD0, AD2, RST, P0–P7 at V+ or
GND, internal pullup disabled
-0.2 +0.2 µA
Input Capacitance
SDA, SCL, AD0, AD2, RST, P0–P7
10 pF
V+ = +1.71V, I
SINK
= 5mA 90 180
V+ = +2.5V, I
SINK
= 10mA 110 210
V+ = +3.3V, I
SINK
= 15mA 130 230
Output Low Voltage
P0–P7
V
OL
V+ = +5V, I
SINK
= 20mA 140 250
mV
Output Low Voltage
SDA
V
OLSDA
I
SINK
= 6mA 250 mV
Output Low Voltage
INT
V
OLINT
I
SINK
= 5mA 130 250 mV
Port Input Pullup Resistor R
PU
25 40 55 kΩ
MAX7321
I
2
C Port Expander with 8 Open-Drain I/Os
_______________________________________________________________________________________ 3
PORT AND INTERRUPT INT TIMING CHARACTERISTICS
(V+ = +1.71V to +5.5V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Port Output Data Valid t
PPV
C
L
≤ 100pF 4 µs
Port Input Setup Time t
PSU
C
L
≤ 100pF 0 µs
Port Input Hold Time t
PH
C
L
≤ 100pF 4 µs
INT Input Data Valid Time t
IV
C
L
≤ 100pF 4 µs
INT Reset Delay Time from STOP t
IP
C
L
≤ 100pF 4 µs
INT Reset Delay Time from
Acknowledge
t
IR
C
L
≤ 100pF 4 µs
TIMING CHARACTERISTICS
(V+ = +1.71V to +5.5V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, T
A
= +25°C.) (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 2) 0.9 µs
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 3, 4)
20 +
0.1C
b
300 ns
Fall Time of Both SDA and SCL
Signals, Receiving
t
F
(Notes 3, 4)
20 +
0.1C
b
300 ns
Fall Time of SDA, Transmitting t
F,TX
(Notes 3, 4)
20 +
0.1C
b
250 ns
Pulse Width of Spike Suppressed t
SP
(Note 5) 50 ns
Capacitive Load for Each Bus
Line
C
b
(Note 3) 400 pF
RST Pulse Width t
W
500 ns
RST Rising to START Condition
Setup Time
t
RST
1µs
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) 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. I
SINK
≤ 6mA. t
R
and t
F
measured between 0.3 x V+ and 0.7 x V+.
Note 5: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

MAX7321AEE+

Mfr. #:
Buy MAX7321AEE+
Manufacturer:
Maxim Integrated
Description:
Interface - I/O Expanders I2C Port Expander w/8 Open-Drain I/Os
Lifecycle:
New from this manufacturer.
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