MAXIM MAX7323 User Manual

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General Description

The MAX7323 2-wire serial-interfaced peripheral fea­tures eight I/O ports. Four ports are push-pull outputs
and the other four are open-drain I/O ports, indepen­dent of supply voltage.

The four 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 MAX7323 is subse­quently accessed through the serial interface, any
pending interrupt is cleared.

The four push-pull and four open-drain outputs are
rated to sink 20mA and are capable of driving LEDs.

The RST input clears the serial interface, terminating
any I2C communication to or from the MAX7323.

The MAX7323 uses two address inputs with four-level
logic to allow 16 I2C slave addresses. The slave
address also determines the power-up logic state for
the I/O ports, and enables or disables internal 40kΩ
pullups for the input ports in groups of two ports.

The MAX7323 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 MAX7323 is available in 16-pin QSOP and 16-pin
TQFN packages, and is specified over the automotive
temperature range (-40°C to +125°C).

Features

♦ 400kHz I2C Serial Interface

♦ +1.71V to +5.5V Operating Voltage

♦ 4 Push-Pull Output Ports Rated at 20mA Sink

Current

♦ 4 Open-Drain I/O Ports Rated to 20mA Sink Current

♦ 4 I/O Ports Are Overvoltage Protected to +6V

♦ 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 Range

MAX7323

I2C Port Expander with 4 Push-Pull Outputs

and 4 Open-Drain I/Os

________________________________________________________________ Maxim Integrated Products 1

19-3806; Rev 1; 7/07

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.

Ordering Information

PART

TEMP

PIN­PACKAGE

TOP

PKG

CODE

MAX7323AEE+

-40°C to
16 QSOP —

E16-4

MAX7323ATE+

-40°C to
3mm x 3mm

T1633-4

Pin Configurations and Functional Diagram appear at end
of data sheet.

Selector Guide

PART

INPUTS

INTERRUPT

MASK

OPEN­DRAIN

PUSH-PULL

OUTPUTS

MAX7319

8 Yes — —

MAX7320

—— — 8

MAX7321

—

—

MAX7322

4 Yes — 4

MAX7323

—

4

MAX7328

—

—

MAX7329

—

—

+Denotes a lead-free package.
*EP = Exposed paddle.

Cell Phones

SAN/NAS

Servers

Notebooks

RAID

Automotive

Applications

MAX7323

P2

O7
O6

P5
P4

V+

0.047μF

μC

SCL

SDA

SCL

AD0

O1
O0

SDA

P3

AD2

INT

OUTPUT
OUTPUT

RST

INT

RST

I/O

I/O

I/O

I/O

OUTPUT
OUTPUT

3.3V

GND

Typical Application Circuit

RANGE

+125°C

16 TQFN-EP*

+125°C

MARK

ADE

OUTPUTS

Up to 8

Up to 4

Up to 8

Up to 8

Up to 8

Up to 4

Up to 8

Up to 8

MAX7323

I2C Port Expander with 4 Push-Pull Outputs
and 4 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, P2–P5 ...................-0.3V to +6V

O0, O1, O6, O7...............................................-0.3 to (V+ + 0.3V)

O0, O1, O6, O7 Output Current........................................±25mA

P2–P5 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, TA= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, TA= +25°C.) (Note 1)

PARAMETER

CONDITIONS

UNITS

Operating Supply Voltage V+

V

Power-On Reset Voltage V

POR

V+ falling 1.6 V

Standby Current
(Interface Idle)

I

STB

1.5 µA

Supply Current
(Interface Running)

I+ f

SCL

= 400kHz; other digital inputs at V+

55 µA

V+ ≤ 1.8V

Input High Voltage

SDA, SCL, AD0, AD2, RST, P2–P5

V

IH

V+ ≥ 1.8

V

V+ ≤ 1.8V

Input Low Voltage

SDA, SCL, AD0, AD2, RST, P2–P5

V

IL

V+ ≥ 1.8V

V

Input Leakage Current

SDA, SCL, AD0, AD2, RST, P2–P5

IIH, I

IL

SDA, SCL, AD0, AD2, RST, P2–P5 at V+ or
GND, internal pullup disabled

-0.2

µA

Input Capacitance

SDA, SCL, AD0, AD2, RST, P2–P5

pF

V+ = +1.71V, I

SINK

= 5mA

180

V+ = +2.5V, I

SINK

= 10mA

240

V+ = +3.3V, I

SINK

= 15mA

290

Output Low Voltage
O0, O1, O6, O7, P2–P5

V

OL

V+ = +5V, I

SINK

= 20mA

310

mV

V+ = +1.71V, I

SOURCE

= 2mA

V+ = +2.5V, I

SOURCE

= 5mA

V+ = +3.3V, I

SOURCE

= 5mA

Output High Voltage
O0, O1, O6, O7

V

OH

V+ = +5V, I

SOURCE

= 10mA

mV

Output Low Voltage
SDA

I

SINK

= 6mA 250 mV

Output Low Voltage

INT

I

SINK

= 5mA

250 mV

Port Input Pullup Resistor R

PU

25

55 kΩ

SYMBOL

SCL and SDA and other digital inputs at V+ 0.6

MIN TYP MAX

1.71 5.50

23

0.8 x V+

0.7 x V+

V

OLSDA

V

OLINT

V+ - 250 V + - 30

V+ - 360 V + - 70

V+ - 260 V + - 100

V+ - 350 V + - 120

10

105

131

154

160

130

40

0.2 x V+

0.3 x V+

+0.2

MAX7323

I2C Port Expander with 4 Push-Pull Outputs

and 4 Open-Drain I/Os

_______________________________________________________________________________________ 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)

PARAMETER

CONDITIONS

UNITS

Port Output Data Valid t

PPV

CL ≤ 100pF 4 µs

Port Input Setup Time t

PSU

CL ≤ 100pF 0 µs

Port Input Hold Time t

PH

CL ≤ 100pF 4 µs

INT Input Data Valid Time t

IV

CL ≤ 100pF 4 µs

INT Reset Delay Time from STOP

t

IP

CL ≤ 100pF 4 µs

INT Reset Delay Time from
Acknowledge

t

IR

CL ≤ 100pF 4 µs

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)

PARAMETER

CONDITIONS MIN

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

0.6 µs

Repeated START Condition
Setup Time

0.6 µs

STOP Condition Setup Time

0.6 µs

Data Hold Time

(Note 2) 0.9 µs

Data Setup Time

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 +

300 ns

Fall Time of Both SDA and SCL
Signals, Receiving

t

F

(Notes 3, 4)

20 +

300 ns

Fall Time of SDA, Transmitting t

F,TX

(Notes 3, 4)

20 +

250 ns

Pulse Width of Spike Suppressed

t

SP

(Note 5)

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 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.

SYMBOL

SYMBOL

t

HD, STA

MIN TYP MAX

TYP MAX

t

SU, STA

t

SU, STO

t

HD, DAT

t

SU, DAT

0.1C

0.1C

0.1C

50

b

b

b

MAX7323

I2C Port Expander with 4 Push-Pull Outputs
and 4 Open-Drain I/Os

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

MAX7323 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 35 50 65 80 95 110 125

SUPPLY CURRENT vs. TEMPERATURE

MAX7323 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)

MAX7323 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+ = +5.0V
I

SINK

= 20mA

V+ = +2.5V
I

SINK

= 10mA

V+ = +1.71V
I

SINK

= 5mA

V+ = +3.3V
I

SINK

= 15mA

OUTPUT VOLTAGE HIGH

vs. TEMPERATURE

TEMPERATURE (°C)

OUTPUT VOLTAGE HIGH (V)

MAX7323 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

= 15mA

V+ = +5.0V
I

SOURCE

= 20mA

V+ = +2.5V
I

SOURCE

= 5mA

V+ = +1.71V
I

SOURCE

= 2mA

Pin Description

PIN

QSOP TQFN

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).

216RST Reset Input, Active Low. Drive RST low to clear the 2-wire interface.

4, 5, 11, 12 2, 3, 9, 10

O0, O1,

Output Ports. O0, O1, O6, and O7 are push-pull outputs.

6, 7, 9, 10 4, 5, 7, 8

I/O Ports. P2 to P5 are open-drain I/Os rated to +6V, 20mA.

86

Ground

13 11 INT Interrupt Output. INT is an open-drain output.

14 12 SCL I2C-Compatible Serial Clock Input

15 13

I2C-Compatible Serial Data I/O

16 14 V+

Positive Supply Voltage. Bypass V+ to GND with a ceramic capacitor of at least

0.047µF as close to the device as possible.

— EP EP Exposed Pad. Connect exposed pad to GND.

NAME

O6, O7

P2–P5

GND

SDA

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 the MAX7319,
MAX7321, MAX7322, or MAX7323.

Functional Overview

The MAX7323 is a general-purpose port expander, oper­ating from a +1.71V to +5.5V supply, that provides four
push-pull output ports with 20mA sink, 10mA source drive
capability, and four open-drain I/O ports with a 20mA sink
capability. The four open-drain outputs are overvoltage
protected to +6V independent of supply voltage.

The MAX7323 is set to one of 16 I2C slave addresses
(0x60 to 0x6F) using the address select inputs AD0 and
AD2, and is accessed over an I2C 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 MAX7323.

MAX7323

I2C Port Expander with 4 Push-Pull Outputs

and 4 Open-Drain I/Os

_______________________________________________________________________________________ 5

PART

I2C

SLAVE

INPUTS

INPUT

INTERRUPT

MASK

OPEN­DRAIN

PUSH-

PULL

APPLICATION

8-PORT EXPANDERS

8 Yes — —

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.

—— — 8

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.

— Up to 8 —

I/O versions:
8 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.

4 Yes — 4

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.

Table 1. MAX7319–MAX7329 Family Comparison

MAX7319 110xxxx

MAX7320 101xxxx

MAX7321 110xxxx Up to 8

MAX7322 110xxxx

ADDRESS

OUTPUTS

OUTPUTS

MAX7323

Any of the four open-drain ports can be configured as a
logic input by setting the port output logic-high (logic­high for an open-drain output is high impedance).
When the MAX7323 is read through the serial interface,
the actual logic levels at the ports are read back.

The four ports offer latching transition detection func­tionality. All input ports are continuously monitored for
changes. An input change sets 1 of 4 flag bits that
identify changed input(s). All flags are cleared upon a
subsequent read or write transaction to the MAX7323.

A latching interrupt output, INT, automatically flags data
changes on any of the I/O ports used as inputs. The
interrupt output INT, and all transition flags are
deasserted when the MAX7323 is next accessed
through the serial interface.

Internal pullup resistors to V+ are selected by the
address select inputs, AD0 and AD2. Pullups are
enabled on the input ports in groups of two (see Table 3).

Use the slave address selection to ensure that I/O ports
used as inputs are logic-high on power-up. I/O ports with
internal pullups enabled default to a logic-high output
state. I/O ports with internal pullups disabled default to
a logic-low output state. Output port power-up logic
states are selected by the address select inputs AD0
and AD2. Ports default to logic-high or logic-low on
power-up in groups of two (see Table 3).

Initial Power-Up

On power-up, the transition detection logic is reset, and
INT is deasserted. The interrupt mask register is set to
0x3C, enabling the interrupt output for transitions on all
four input ports. The transition flags are cleared to indi­cate no data changes. The power-up default state of the
four push-pull outputs is set according to the I2C slave
address selection inputs, AD0 and AD2 (see Table 3).

Power-On Reset

The MAX7323 contains an integral power-on-reset
(POR) circuit that ensures all registers are reset to a
known state on power-up. When V+ rises above V

POR

(1.6V max), the POR circuit releases the registers and
2-wire interface for normal operation. When V+ drops to
less than V

POR

, the MAX7323 resets all ports to the

POR defaults (see Table 3).

RST

Input

The active-low RST input operates as a reset that voids
any current I2C transaction involving the MAX7323,
forcing the MAX7323 into the I2C STOP condition. The
reset action does not clear the interrupt output (INT).

Standby Mode

When the serial interface is idle, the MAX7323 automat­ically enters standby mode, drawing minimal supply
current.

I2C Port Expander with 4 Push-Pull Outputs
and 4 Open-Drain I/Os

6 _______________________________________________________________________________________

PART

I2C

SLAVE

INPUTS

INPUT

INTERRUPT

MASK

OPEN­DRAIN

PUSH-

PULL

APPLICATION

MAX7323

— Up to 4 4

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.

MAX7328

MAX7329

— Up to 8 —

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
open-drain output to logic-high.

16-PORT EXPANDERS

MAX7324

8 Yes — 8

Software equivalent to a MAX7320 plus a MAX7319.

MAX7325

— Up to 8 8

Software equivalent to a MAX7320 plus a MAX7321.

MAX7326

4 Yes — 12

Software equivalent to a MAX7320 plus a MAX7322.

MAX7327

and

— Up to 4 12

Software equivalent to a MAX7320 plus a MAX7323.

Table 1. MAX7319–MAX7329 Family Comparison (continued)

ADDRESS

110xxxx Up to 4

0100xxx
0111xxx

101xxxx

110xxxx

Up to 8

Up to 8

Up to 4

OUTPUTS

OUTPUTS