MAXIM MAX7319 User Manual

19-3809; Rev 1; 10/05

EVALUATION KIT

AVAILABLE

I2C Port Expander with Eight Inputs and

Maskable Transition Detection

General Description

The MAX7319 2-wire serial-interfaced peripheral features 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 interrupt is cleared.

The +5.5V tolerant RST input clears the serial interface, terminating any I MAX7319.

The MAX7319 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 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 (-40°C to +125°C).

C†communication to or from the

Features

♦ 400kHz, +5.5V-Tolerant I2C Serial Interface

♦ +1.71V to +5.5V Operating Voltage

♦ 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 (typ) Standby Current

♦ -40°C to +125°C Operating Temperature Range

Ordering Information

PART PIN-PACKAGE TOP MARK PKG CODE

MAX7319AEE+ 16 QSOP — E16-4

MAX7319ATE+ 16 TQFN-EP* ADA T1633-4

Note: All devices specified over -40°C to +125°C operating range. +Denotes lead-free package. *EP = Exposed pad.

MAX7319

Cell Phones SAN/NAS Servers

Applications

Notebooks Satellite Radio Automotive

Pin Configurations, 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* — —

MAX7329**

*Second source to PCF8574. **Second source to PCF8574A.

†

l S.

________________________________________________________________ Maxim Integrated Products 1

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.

Up to 8

—

Up to 8

—

MAX7319

I2C 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, I0–I7......................-0.3V to +6V

SDA Input Current.............................................................. 10mA

INT Input Current ................................................................10mA

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

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

Continuous Power Dissipation (T

= +70°C)

16-Pin QSOP (derate 8.3mW/°C over +70°C)..............667mW

16-Pin TQFN (derate 15.6mW/°C over +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 SYMBOL CONDITIONS MIN TYP MAX UNITS

Operating Supply Voltage V+

Power-On Reset Voltage V

Standby Current (Interface Idle) I

Supply Current (Interface Running)

Input High Voltage SDA, SCL, AD0, AD2, RST, I0–I7

Input Low Voltage SDA, SCL, AD0, AD2, RST, I0–I7

Input Leakage Current SDA, SCL, AD0, AD2, RST, I0–I7

Input Capacitance SDA, SCL, AD0, AD2, RST, I0–I7

Output Low Voltage SDA

Output Low Voltage

INT

Port Input Pullup Resistor R

POR

STB

I+ f

OLSDAISINK

OLINTISINK

SCL and SDA and other digital inputs at V+ 0.6 1.5 µA

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

SCL

V+ < 1.8V 0.8 x V+

V+ ≥ 1.8V 0.7 x V+

V+ < 1.8V 0.2 x V+

V+ ≥ 1.8V 0.3 x V+ SDA, SCL, AD0, AD2, RST, I0–I7 at V+ or

, I

GND

= 6mA 250 mV

= 5mA 100 250 mV

1.71

-0.2 +0.2 µA

25 40 55 kΩ

5.50 V

1.6 V

10 pF

MAX7319

I2C Port Expander with Eight Inputs and

Maskable Transition Detection

_______________________________________________________________________________________ 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)

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)

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.

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Port Input Setup Time t

Port Input Hold Time t

INT Input Data Valid Time t INT Reset Delay Time from STOP t

INT Reset Delay Time from

Acknowledge

PSU

CL ≤ 100pF 0 µs

CL ≤ 100pF 4 µs

Serial Clock Frequency f

Bus Free Time Between a STOP and a START Condition

Hold Time (Repeated) START Condition

Repeated START Condition Setup Time

STOP Condition Setup Time t

Data Hold Time t

Data Setup Time t

SCL Clock Low Period t

SCL Clock High Period t

Rise Time of Both SDA and SCL Signals, Receiving

Fall Time of Both SDA and SCL Signals, Receiving

Fall Time of SDA, Transmitting t

Pulse Width of Spike Suppressed t

Capacitive Load for Each Bus Line

RST Pulse Width t

RST Rising to START Condition

Setup Time

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

SCL

BUF

HD, STA

SU, STA

SU, STO

HD, DAT

SU, DAT

LOW

HIGH

F,TX

RST

1.3 µs

0.6 µs

(Note 2) 0.9 µs

100 ns

1.3 µs

0.7 µs

(Notes 3, 4)

(Note 5) 50 ns

(Note 3) 400 pF

500 ns

20 +

0.1C

20 +

0.1C

20 +

0.1C

1µs

400 kHz

300 ns

250 ns

MAX7319

I2C Port Expander with Eight Inputs and Maskable Transition Detection

4 _______________________________________________________________________________________

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

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

SUPPLY CURRENT vs. TEMPERATURE

MAX7319 toc02

TEMPERATURE (°C)

SUPPLY CURRENT (μA)

V+ = +3.3V

V+ = +5.0V

V+ = +1.71V

V+ = +2.5V

SCL

= 400kHz

Pin Description

STANDBY CURRENT vs. TEMPERATURE

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

STANDBY CURRENT (μA)

0.4

0.2

V+ = +2.5V

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

V+ = +3.3V

TEMPERATURE (°C)

= 0kHz

SCL

V+ = +5.0V

V+ = +1.71V

MAX7319 toc01

QSOP TQFN

1, 3 15, 1 AD0, AD2

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

4–7, 9–12 2–5, 7–10 I0–I7 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 I2C-Compatible Serial Clock Input

15 13 SDA 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.

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

NAME FUNCTION

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).

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 second sources to the PCF8574 and PCF8574A.

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 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 I2C slave addresses (0x60 to 0x6F) using the address-select inputs AD2 and AD0, and is accessed over an I

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 functionality. All input ports are continuously monitored for

MAX7319

I2C Port Expander with Eight Inputs and

Maskable Transition Detection

_______________________________________________________________________________________ 5

Table 1. MAX7319–MAX7329 Family Comparison

PART

8-PORT EXPANDERS

MAX7319 110xxxx 8 Yes — —

MAX7320 101xxxx — — — 8

MAX7321 110xxxx Up to 8 — Up to 8 —

MAX7322 110xxxx 4 Yes — 4

SLAVE

ADDRESS

INPUTS

INPUT

INTERRUPT

MASK

OPENDRAIN

OUTPUTS

PUSH-

PULL

OUTPUTS

APPLICATION

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. Output-only versions: Eight push-pull outputs with selectable power-up default levels. Push-pull outputs offer faster rise time than opendrain outputs, and require no pullup resistors. 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. 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.

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