MAXIM AMX7326 User Manual

General Description

The MAX7326 2-wire serial-interfaced peripheral features 16 I/O ports. The ports are divided into 12 pushpull 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, +6V-tolerant INT output. When the MAX7326 is subsequently accessed through the serial interface, any pending interrupt is cleared. The 12 push-pull outputs are rated to sink 20mA and are capable of driving LEDs. The RST input clears the serial interace, terminating any I

C communi-

cation to or from the MAX7326.

The MAX7326 uses two address inputs with four-level logic to allow 16 I2C slave addresses. The slave address also sets the power-up default state for the 12 output ports and enables or disables internal 40kΩ pullups in groups of two input ports.

The MAX7326 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 MAX7326 is available in 24-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 Operating Voltage

♦ 12 Push-Pull Outputs Rated at 20mA Sink Current

♦ 4 Input Ports with Matchable 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

MAX7326

I2C Port Expander with 12 Push-Pull Outputs

and 4 Inputs

________________________________________________________________ Maxim Integrated Products 1

19-3804; 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.

EVALUATION KIT

AVAILABLE

Ordering Information

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

Selector Guide

Cell Phones SAN/NAS Servers

Notebooks Satellite Radio Automotive

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

Pin Configurations

Pin Configurations continued at end of data sheet.

PART TEMP RANGE

MAX7326AEG+ -40°C to +125°C 24 QSOP E24-1

MAX7326ATG+ -40°C to +125°C

PINPACKAGE

24 TQFN-EP* (4mm x 4mm)

PKG

CODE

T-2444-3

TOP VIEW

18 17 16 15 14 13

SCL

SDA

V+

INT

RST

AD2

12 3456

TQFN (4mm x 4mm)

AD0

O15

MAX7326

EXPOSED PADDLE

O14

O13

O12

O11

O10

GND

PART INPUTS

MAX7324 8 Yes — 8

MAX7325 Up to 8 — Up to 8 8

MAX7326 4 Yes — 12

MAX7327 Up to 4 — Up to 4 12

INTERRUPT

MASK

OPENDRAIN

OUTPUTS

PUSH-PULL

OUTPUTS

MAX7326

I2C Port Expander with 12 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–O15 .............................................-0.3V to V+ + 0.3V

O0, O1, O6–O15 Output Current......................................±25mA

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

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

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

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

Continuous Power Dissipation (T

= +70°C)

24-Pin QSOP (derate 9.5mW/°C over +70°C)............761.9mW

24-Pin TQFN (derate 20.8mW/°C over +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

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 1.71

Power-On Reset Voltage V

POR

V+ falling 1.6 V

Standby Current (Interface Idle) I

STB

0.6 1.9 µA

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, I2–I5

V+ ≥ 1.8V 0.7 x V+

V+ < 1.8V

Input Low Voltage SDA, SCL, AD0, AD2, RST, I2–I5

V+ ≥ 1.8V

Input Leakage Current SDA, SCL, AD0, AD2, RST, I2–I5

, I

SDA, SCL, AD0, AD2, RST, I2–I5 at V+ or GND

-0.2

µA

Input Capacitance SDA, SCL, AD0, AD2, RST, I2–I5

10 pF

QSOP 90

V+ = +1.71V, I

SINK

= 5mA

TQFN 90

QSOP

V+ = +2.5V, I

SINK

= 10mA

TQFN

QSOP

V+ = +3.3V, I

SINK

= 15mA

TQFN

QSOP

Output Low Voltage O0, O1, O6–O15

V+ = +5V, I

SINK

= 20mA

TQFN

V+ = +1.71V, I

SOURCE

= 2mA

V+ = +2.5V, I

SOURCE

= 5mA

V+ = +3.3V, I

SOURCE

= 5mA

Output High Voltage O0, O1, O6–O15

V+ = +5V, I

SOURCE

= 10mA

Output Low Voltage SDA

SINK

= 6mA

Output Low Voltage INT

SINK

= 5mA

Port Input Pullup Resistor R

25 40 55 kΩ

SCL and SDA and other digital inputs at V+

Supply Current (Interface Running)

5.50

OLSDA

OLINT

110 210

110 260

130 230

130 280

V+ - 250 V+ - 30

V+ - 360 V+ - 30

V+ - 260 V+ - 30

V+ - 360 V+ - 30

140 250

140 300

130 250

0.2 x V+

0.3 x V+

+0.2

180

230

250

MAX7326

I2C Port Expander with 12 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)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

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. I

SINK

≤ 6mA. tRand tFmeasured 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.

HD,STA

SU,STO

HD,DAT

SU,DAT

0.1C

MAX7326

I2C Port Expander with 12 Push-Pull Outputs and 4 Inputs

4 _______________________________________________________________________________________

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

Pin Description

QSOP

TQFN

NAME FUNCTION

122 INT Interrupt Output, Active Low. INT is an open-drain output. 223 RST Reset Input, Active Low. 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, 5, 10,

11, 13–20

1, 2, 7, 8,

10–17

O0, O1,

O6–O15

Output Ports. These push-pull outputs are rated at 20mA.

6–9 3–6 I2–I5 Input Ports. I2 and I5 are CMOS-logic inputs protected to +6V.

12 9 GND Ground 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 0.047µF ceramic capacitor. — EP EP Exposed Paddle. Connect exposed paddle to GND.

STANDBY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

STANDBY CURRENT (µA)

MAX7326 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)

MAX7326 toc02

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

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)

MAX7326 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

V+ = +1.62V I

SINK

= 4mA

OUTPUT-VOLTAGE HIGH

vs. TEMPERATURE

TEMPERATURE (°C)

OUTPUT-VOLTAGE HIGH (V)

MAX7326 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

24, 18

Detailed Description

MAX7319–MAX7329 Family Comparison

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 MAX7326 is a general-purpose port expander operating from a +1.71V to +5.5V supply that provides 12 push-pull output ports with 20mA sink, 10mA source drive capability, and four CMOS input ports that are overvoltage protected to +6V. The MAX7326 is rated to

sink a total of 100mA and source a total of 50mA from all 12 combined outputs.

The MAX7326 is set to two of 32 I

C slave addresses (see Tables 2 and 3) using address inputs AD0 and AD2, and is accessed over an I2C serial interface up to 400kHz. Eight outputs use a different slave address from the other four outputs and four inputs. Eight pushpull outputs, O8–O15, use the 101xxxx addresses while the four outputs O0, O1, O6, and O7 and inputs I2–I5 use addresses with 110xxxx. The RST input clears the serial interface in case of a bus lockup, terminating any serial transaction to or from the MAX7326.

MAX7326

I2C Port Expander with 12 Push-Pull Outputs

and 4 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

101xxxx

110xxxx

Up to 8

OUTPUTS

MAX7326

I2C Port Expander with 12 Push-Pull Outputs and 4 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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