General Description
The MAX7319 2-wire serial-interfaced peripheral fea-
tures eight input ports with selectable internal pullups,
overvoltage protection to +6V, and transition detection
with interrupt output.
All input ports are continuously monitored for state
changes (transition detection). Transitions are latched,
allowing detection of transient changes. Any combination
of inputs can be selected using the interrupt mask to
assert the INT output. When the MAX7319 is subsequently
accessed through the serial interface, any pending inter-
rupt is cleared.
The +5.5V tolerant RST input clears the serial interface,
terminating any I
2
C communication to or from the
MAX7319.
The MAX7319 uses two address inputs with four-level
logic to allow 16 I
2
C slave addresses. The slave
address also enables or disables internal 40k
pullups
in groups of four ports.
The MAX7319 supports hot insertion. All eight input
ports, the serial interface SDA, SCL, AD0, AD2, INT,
and RST remain high impedance in power-down (V+ =
0) with up to +6V asserted on them.
The MAX7319 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 MAX7319 is available in 16-pin QSOP and 16-pin
TQFN packages, and is specified over the automotive
temperature range (-40C to +125C).
Applications
Features
o 400kHz, +5.5V-Tolerant I
2
C Serial Interface
o +1.71V to +5.5V Operating Voltage
o Eight Input Ports with Maskable, Latching
Transition Detection
o Input Ports are Overvoltage Protected to +6V
o Transient Changes are Latched, Allowing
Detection Between Read Operations
o INT Output Alerts Change on Any Selection of
Inputs
o AD0 and AD2 Inputs Select from 16 Slave
Addresses
o Low 0.6A (typ) Standby Current
o -40C to +125C Operating Temperature Range
MAX7319
I
2
C Port Expander with Eight Inputs and
Maskable Transition Detection
________________________________________________________________ Maxim Integrated Products
1
19-3809; Rev 1; 10/05
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
PIN-PACKAGE
TOP MARK
PKG CODE
MAX7319AEE+
16 QSOP
--
E16-4
MAX7319ATE+
16 TQFN-EP*
ADA
T1633-4
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*
--
--
MAX7329**
Up to 8
--
Up to 8
--
*Second source to PCF8574.
**Second source to PCF8574A.
Purchase of I
2
C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a
license under the Philips I
2
C Patent Rights to use these components in an I
2
C system, provided that the system conforms to the I
2
C
Standard Specification as defined by Philips.
Cell Phones
SAN/NAS
Servers
Notebooks
Satellite Radio
Automotive
Note: All devices specified over -40C to +85C operating range.
+Denotes lead-free package.
*EP = Exposed pad.
Pin Configurations, Typical Application Circuit, and
Functional Diagram appear at end of data sheet.
MAX7319
I
2
C Port Expander with Eight Inputs and
Maskable Transition Detection
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, I0I7......................-0.3V to +6V
SDA Input Current.............................................................. 10mA
INT Input Current ................................................................10mA
Total V+ Current..................................................................50mA
Total GND Current ...........................................................100mA
Continuous Power Dissipation (T
A
= +70C)
16-Pin QSOP (derate 8.3mW/C over +70C)..............667mW
16-Pin TQFN (derate 15.6mW/C over +70C) ..........1250mW
Operating Temperature Range .........................-40C to +125C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) .................................+300C
ELECTRICAL CHARACTERISTICS
(V+ = +1.71V to +5.5V, T
A
= -40C to +125C, unless otherwise noted. Typical values are at V+ = +3.3V, T
A
= +25C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Operating Supply Voltage
V+
1.71
5.50
V
Power-On Reset Voltage
V
POR
1.6
V
Standby Current (Interface Idle)
I
STB
SCL and SDA and other digital inputs at V+
0.6
1.5
A
Supply Current
(Interface Running)
I+
f
SCL
= 400kHz; other digital inputs at V+
23
55
A
V
+
< 1.8V
0.8 x V+
Input High Voltage
SDA, SCL, AD0, AD2, RST, I0I7
V
IH
V
+
1.8V
0.7 x V+
V
V
+
< 1.8V
0.2 x V+
Input Low Voltage
SDA, SCL, AD0, AD2, RST, I0I7
V
IL
V
+
1.8V
0.3 x V+
V
Input Leakage Current
SDA, SCL, AD0, AD2, RST, I0I7
I
IH
, I
IL
SDA, SCL, AD0, AD2, RST, I0I7 at V+ or
GND
-0.2
+0.2
A
Input Capacitance
SDA, SCL, AD0, AD2, RST, I0I7
10
pF
Output Low Voltage
SDA
V
OLSDA
I
SINK
= 6mA
250
mV
Output Low Voltage
INT
V
OLINT
I
SINK
= 5mA
100
250
mV
Port Input Pullup Resistor
R
PU
25
40
55
k
MAX7319
I
2
C Port Expander with Eight Inputs and
Maskable Transition Detection
_______________________________________________________________________________________
3
PORT AND INTERRUPT INT TIMING CHARACTERISTICS
(V+ = +1.71V to +5.5V, T
A
= -40C to +125C, unless otherwise noted. Typical values are at V+ = +3.3V, T
A
= +25C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Port Input Setup Time
t
PSU
C
L
100pF
0
s
Port Input Hold Time
t
PH
C
L
100pF
4
s
INT Input Data Valid Time
t
IV
C
L
100pF
4
s
INT Reset Delay Time from STOP
t
IP
C
L
100pF
4
s
INT Reset Delay Time from
Acknowledge
t
IR
C
L
100pF
4
s
TIMING CHARACTERISTICS
(V+ = +1.71V to +5.5V, T
A
= -40C to +125C, unless otherwise noted. Typical values are at V+ = +3.3V, T
A
= +25C.) (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
s
Hold Time (Repeated) START
Condition
t
HD, STA
0.6
s
Repeated START Condition
Setup Time
t
SU, STA
0.6
s
STOP Condition Setup Time
t
SU, STO
0.6
s
Data Hold Time
t
HD, DAT
(Note 2)
0.9
s
Data Setup Time
t
SU, DAT
100
ns
SCL Clock Low Period
t
LOW
1.3
s
SCL Clock High Period
t
HIGH
0.7
s
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
1
s
Note 1: All parameters are tested at T
A
= +25C. 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+ and 0.7 x V+, I
SINK
6mA.
Note 5: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.
MAX7319
I
2
C Port Expander with Eight Inputs and
Maskable Transition Detection
4
_______________________________________________________________________________________
Typical Operating Characteristics
(T
A
= +25C, unless otherwise noted.)
0
20
10
40
30
50
60
-40
-10 5
20
-25
35 50 65 80 95 110 125
SUPPLY CURRENT vs. TEMPERATURE
MAX7319 toc02
TEMPERATURE (
C)
SUPPLY CURRENT (
A)
V+ = +3.3V
V+ = +5.0V
V+ = +1.71V
V+ = +2.5V
f
SCL
= 400kHz
Pin Description
PIN
QSOP
TQFN
NAME
FUNCTION
1, 3
15, 1
AD0, AD2
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 3).
2
16
RST
Reset Input, Active Low. Drive RST low to clear the 2-wire interface.
47, 912
25, 710
I0I7
Input Ports. I0 to I7 are CMOS logic inputs protected to +6V.
8
6
GND
Ground
13
11
INT
Interrupt Output, Active Low. INT is an open-drain output rated at +6V.
14
12
SCL
I
2
C-Compatible Serial Clock Input
15
13
SDA
I
2
C-Compatible Serial Data I/O
16
14
V+
Positive Supply Voltage. Bypass V+ to GND with a ceramic capacitor of at least 0.047F.
--
EP
EP
Exposed Pad. Connect exposed pad to GND.
0
0.4
0.2
1.0
0.8
0.6
1.2
1.4
1.8
1.6
-40
-10 5
-25
20 35 50 65 80 95 110 125
STANDBY CURRENT vs. TEMPERATURE
MAX7319 toc01
TEMPERATURE (
C)
STANDBY CURRENT (
A)
V+ = +3.3V
V+ = +2.5V
V+ = +5.0V
V+ = +1.71V
f
SCL
= 0kHz
2.0
Detailed Description
MAX7319MAX7329 Family Comparison
The MAX7319MAX7323 family consists of five pin-
compatible, eight-port expanders. Each version is opti-
mized for different applications. The MAX7328 and
MAX7329 are second sources to the PCF8574 and
PCF8574A.
The MAX7324MAX7327 family consists of four pin-
compatible, 16-port expanders that integrate the func-
tions of the MAX7320 and one of either the MAX7319,
MAX7321, MAX7322, or MAX7323.
Functional Overview
The MAX7319 is a general-purpose port expander,
operating from a +1.71V to +5.5V supply that provides
eight CMOS input ports that are overvoltage protected
to +6V independent of supply voltage.
The MAX7319 is set to one of 16 I
2
C slave addresses
(0x60 to 0x6F) using the address-select inputs AD2
and AD0, and is accessed over an I
2
C serial interface.
The RST input clears the serial interface in case of a
hung bus, terminating any serial transaction to or from
the MAX7319.
The input ports offer latching transition detection func-
tionality. All input ports are continuously monitored for
MAX7319
I
2
C Port Expander with Eight Inputs and
Maskable Transition Detection
_______________________________________________________________________________________
5
PART
I
2
C
SLAVE
ADDRESS
INPUTS
INPUT
INTERRUPT
MASK
OPEN-
DRAIN
OUTPUTS
PUSH-
PULL
OUTPUTS
APPLICATION
8-PORT EXPANDERS
MAX7319
110xxxx
8
Yes
--
--
Input-only versions:
Eight 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.
MAX7320
101xxxx
--
--
--
8
Output-only versions:
Eight push-pull outputs with selectable power-up
default levels.
Push-pull outputs offer faster rise time than open-
drain outputs, and require no pullup resistors.
MAX7321
110xxxx
Up to 8
--
Up to 8
--
I/O versions:
Eight open-drain I/O ports with latching transition
detection interrupt and selectable pullups.
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 open-drain output to logic-high.
Transition flags identify which inputs have changed
(even momentarily) since the ports were last read.
MAX7322
110xxxx
4
Yes
--
4
Four input-only, four output-only versions:
Four input ports with programmable latching
transition detection interrupt and selectable pullups.
Four push-pull outputs with selectable power-up
default levels.
Table 1. MAX7319MAX7329 Family Comparison
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