MAXIM MAX7324 User Manual

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General Description

The MAX7324 2-wire serial-interfaced peripheral features 16 I/O ports that are divided into eight push-pull outputs and eight inputs. Each input features selectable internal pullups, overvoltage protection to +6V, and transition detection with an interrupt output.

All 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 INT output. When the MAX7324 is subsequently accessed through the serial interface, any pending interrupt is cleared.

The push-pull 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 MAX7324.

The MAX7324 uses two address inputs with four-level logic to allow 16 I2C slave addresses. The slave address also enables or disables internal 40kΩ pullups in groups of four ports.

The MAX7324 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 MAX7324 is available in 24-pin QSOP and TQFN packages, and is specified over the -40°C to +125°C automotive temperature range.

Applications

Cell Phones Notebooks SAN/NAS Automotive Servers Satellite Radio

Features

♦ 400kHz, +6V-Tolerant I2C Serial Interface ♦ +1.71V to 5.5V Operating Voltage ♦ Eight Push-Pull Outputs ♦ Eight 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 Standby Current ♦ -40°C to +125°C Temperature Range

MAX7324

I2C Port Expander with Eight Push-Pull Outputs

and Eight Inputs

________________________________________________________________ Maxim Integrated Products 1

19-3785; Rev 0; 10/06

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

PINPACKAGE

PKG

CODE

MAX7324AEG+

24 QSOP

E24-1

MAX7324ATG+

24 TQFN-EP*

T2444-3

Typical Application Circuit and Functional Diagram appear at end of data sheet.

Selector Guide

PART

INPUTS

INTERRUPT

MASK

OPENDRAIN

PUSH-PULL

OUTPUTS

MAX7324

8 Yes — 8

MAX7325

—

MAX7326

4 Yes — 12

MAX7327

—

Pin Configurations

TQFN (4mm x 4mm)

TOP VIEW

MAX7324

12 3456

18 17 16 15 14 13

SCL

V+

SDA

INT

AD2

AD0

O15

O13

O12

O11

RST

O10

GND

O14

EXPOSED PADDLE

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

Pin Configurations continued at end of data sheet.

-40°C to +125°C

-40°C to +125°C (4mm x 4mm)

OUTPUTS

Up to 8

Up to 4

Up to 8

Up to 4

MAX7324

I2C Port Expander with Eight Push-Pull Outputs and Eight 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, I0–I7......................-0.3V to +6V

O8–O15………….…………………………..…-0.3V to (V+ + 0.3V)

O8–O15 Output Current......………………………………...±25mA

SDA Sink Current ............................................................... 10mA

INT Sink Current..................................................................10mA

Total V+ Current..................................................................50mA

Total GND Current ...........................................................100mA

Continuous Power Dissipation

24-Pin QSOP (derate 9.5mW/°C over T

= +70°C) ..761.9mW 24-Pin TQFN (derate 20.8mW/°C over T

= +70°C) ............................................................1666.7mW

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+ TA = -40°C to +125°C

Power-On Reset Voltage V

POR

V+ falling 1.6 V

Standby Current (Interface Idle) I

STB

0.6 1.9 µA

Supply Current (Interface Running)

I+ f

SCL

= 400kHz; other digital inputs at V+ 23 55 µA

V+ < 1.8V

Input High-Voltage

V+ ≥ 1.8

V+ < 1.8V

Input Low-Voltage

V+ ≥ 1.8

Input Leakage Current

IIH, I

SDA, SCL, AD0, AD2, RST, I0–I7 at V+ or GND

-0.2

µA

Input Capacitance

10 pF

V+ = +1.71V, I

SINK

= 5mA (QSOP) 90

V+ = +1.71V, I

SINK

= 5mA (TQFN) 90

V+ = +2.5V, I

SINK

= 10mA (QSOP) 110

V+ = +2.5V, I

SINK

= 10mA (TQFN) 110

V+ = +3.3V, I

SINK

= 15mA (QSOP) 130

V+ = +3.3V, I

SINK

= 15mA (TQFN) 130

V+ = +5V, I

SINK

= 20mA (QSOP) 140

Output Low Voltage O8–O15

V+ = +5V, I

SINK

= 20mA (TQFN) 140

V+ = +1.71V, I

SOURCE

= 2mA

V+ = +2.5V, I

SOURCE

= 5mA

V+ = +3.3V, I

SOURCE

= 5mA

Output High Voltage O8–O15

V+ = +5V, I

SOURCE

= 10mA

Output Low-Voltage SDA

SINK

= 6mA

Output Low-Voltage INT V

OLINTISINK

= 5mA 130

Port Input Pullup Resistor R

25 40 55 kΩ

SCL and SDA and other digital inputs at V+

1.71 5.50

SDA, SCL, AD0, AD2, RST, I0–I7

OLSDA

0.8 x V+

0.7 x V+

V+ - 250 V+ - 30

V+ - 360 V+ - 70

V+ - 260 V+ - 100

V+ - 360 V+ - 120

0.2 x V+

0.3 x V+

+0.2

180

230

210

260

230

280

250

300

250

MAX7324

I2C Port Expander with Eight Push-Pull Outputs

and Eight 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)

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

CL ≤ 100pF 4 µs

INT Input Data Valid Time t

CL ≤ 100pF 4 µs

INT Reset Delay Time from STOP

CL ≤ 100pF 4 µs

INT Reset Delay Time from Acknowledge

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

SYMBOL

CONDITIONS MIN

TYP

MAX

UNITS

Serial-Clock Frequency f

SCL

400 kHz

Bus Free Time Between a STOP and a START Condition

BUF

1.3 µs

Hold Time (Repeated) START Condition

0.6 µs

Repeated START Condition Setup Time

SU,STA

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

(Notes 3, 4)

20 +

300 ns

Fall Time of Both SDA and SCL Signals, Receiving

(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

(Note 5)

Capacitive Load for Each Bus Line

(Note 3) 400 pF

RST Pulse Width t

500 ns

RST Rising to START Condition Setup Time

RST

1µs

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

of the SCL signal) to bridge

the undefined region of SCL’s falling edge.

Note 3: Guaranteed by design. Note 4: C

= total capacitance of one bus line in pF. tRand tFmeasured 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.

SYMBOL

HD,STA

SU,STO

HD,DAT

SU,DAT

MIN TYP MAX

0.1C

MAX7324

I2C Port Expander with Eight Push-Pull Outputs and Eight Inputs

4 _______________________________________________________________________________________

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

STANDBY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

STANDBY CURRENT (µA)

MAX7324 toc01

-40 -25 -10 5 20 35 50 65 80 95 110 125

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

V+ = +3.3V

V+ = +5.0V

V+ = +2.5V

V+ = +1.71V

SCL

= 0kHz

SUPPLY CURRENT vs. TEMPERATURE

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

MAX7324 toc02

-40-25-105 203550658095110125

V+ = +3.3V

V+ = +5.0V

V+ = +2.5V

V+ = +1.71V

SCL

= 400kHz

OUTPUT-VOLTAGE LOW

vs. TEMPERATURE

TEMPERATURE (°C)

OUTPUT-VOLTAGE LOW (V)

MAX7324 toc03

-40 -25 -10 5 20 35 50 65 80 95 110 125

0.05

0.10

0.15

0.20

0.25

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)

MAX7324 toc04

-40 -25 -10 5 20 35 50 65 80 95 110 125

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

QSOP

TQFN

NAME FUNCTION

122 INT Active-Low Interrupt Output. INT is an open-drain output. 223 RST Active-Low Reset Input. Drive RST low to clear the 2-wire interface.

3, 21

AD2, AD0

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 Tables 2 and 3).

4–11 1–8 I0–I7 Input Ports. I0 to I7 are CMOS-logic inputs.

12 9 GND Ground

13–20 10–17 08–015 Output Ports. O8–O15 are push-pull outputs rated at 20mA.

22 19 SCL I2C-Compatible Serial Clock Input

23 20 SDA I2C-Compatible Serial Data I/O

24 21 V

Positive Supply Voltage. Bypass V+ to GND with a ceramic capacitor of at least 0.047µF.

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

24, 18

Detailed Description

MAX7324–MAX7327 Family Comparison

The MAX7324–MAX7327 family consists of four pincompatible, 16-port expanders that integrate the function of the MAX7320 and one of either the MAX7319, MAX7321, MAX7322, or MAX7323.

Functional Overview

The MAX7324 is a general-purpose port expander operating from a +1.71V to +5.5V supply with eight push-pull outputs and eight CMOS input ports that are overvoltage protected to +5.5V.

The MAX7324 is set to two of 32 I

C slave addresses (see Tables 2 and 3) using address select inputs AD0 and AD2, and is accessed over an I2C serial interface up to 400kHz. The eight outputs and eight inputs have different slave addresses. The eight push-pull outputs have the 101xxxx addresses and the eight inputs have the adresses with 110xxxx. The RST input clears the serial interface in case of a bus lockup, terminating any serial transaction to or from the MAX7324.

The input ports offer latching transition detection feature. All input ports are continuously monitored for changes. An input change sets 1 of 8 flag bits that identify the changed input(s). All flags are cleared upon a subsequent read or write transaction to the MAX7324.

MAX7324

I2C Port Expander with Eight Push-Pull Outputs

and Eight Inputs

_______________________________________________________________________________________ 5

PART

I2C

SLAVE

INPUTS

INPUT

INTERRUPT

MASK

OPENDRAIN

PUSH-

PULL

CONFIGURATION

16-PORT EXPANDERS

MAX7324

8 Yes — 8

8 inputs and 8 push-pull outputs version:

8 input ports with programmable latching transition detection interrupt and selectable pullups.

8 push-pull outputs with selectable default logic levels.

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 if only for

a transient) since the ports were last read.

MAX7325

and

— Up to 8 8

8 I/O and 8 push-pull outputs version: 8 open-drain I/O ports with latching transition detection interrupt and selectable pullups.

8 push-pull outputs with selectable default logic levels.

Open-drain outputs can level shift the logic-high state to a higher or lower voltage than V+ using external pullup resistors, but pullups draw current when output is low. Any open-drain port can be used as an input by setting the open-drain output to logichigh. Transition flags identify which open-drain port inputs have changed (even if only for a transient) since the ports were last read.

Table 1. MAX7319–MAX7329 Family Comparison

ADDRESS

OUTPUTS

101xxxx

110xxxx

Up to 8

MAX7324

I2C Port Expander with Eight Push-Pull Outputs and Eight Inputs

6 _______________________________________________________________________________________

PART

I2C

SLAVE

INPUTS

INPUT

INTERRUPT

MASK

OPENDRAIN

PUSH-

PULL

CONFIGURATION

MAX7326

4 Yes — 12

4 input-only, 12 push-pull output versions: 4 input ports with programmable latching transition detection interrupt and selectable pullups.

12 push-pull outputs with selectable default logic levels.

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 if only for

a transient) since the ports were last read.

MAX7327

and

— Up to 4 12

4 I/O, 12 push-pull output versions: 4 open-drain I/O ports with latching transition detection interrupt and selectable pullups.

12 push-pull outputs with selectable default logic levels.

8-PORT EXPANDERS

MAX7319

8 Yes — —

Input-only versions: 8 input ports with programmable latching transition detection interrupt and selectable pullups.

MAX7320

—— — 8

Output-only versions: 8 push-pull outputs with selectable power-up default levels.

MAX7321

— Up to 8 —

I/O versions: 8 open-drain I/O ports with latching transition detection interrupt and selectable pullups.

MAX7322

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 (continued)

ADDRESS

101xxxx

110xxxx

Up to 4

OUTPUTS

110xxxx

101xxxx

110xxxx Up to 8

110xxxx

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