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MAX7319

I2C Port Expander with Eight Inputs and Maskable Transition Detection

Maxim Integrated 

MAX7319

I2C Port Expander with Eight Inputs

and Maskable Transition Detection

Detailed Description

MAX7319–MAX7329 Family Comparison

The MAX7319–MAX7323 family consists of five

pin-compatible, 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

pin-compatible, 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 I2C 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

Table 1. MAX7319–MAX7329 Family Comparison

PART

I2C

INPUT

SLAVE INPUTS INTERRUPT

ADDRESS

MASK

8-PORT EXPANDERS

OPEN-

DRAIN

OUTPUTS

PUSH-

PULL

OUTPUTS

APPLICATION

Input-only versions:

Eight input ports with programmable latching

transition detection interrupt and selectable pullups.

MAX7319 110xxxx

8

Yes

—

—

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

—

—

MAX7321 110xxxx Up to 8

—

MAX7322 110xxxx

4

Yes

—

Up to 8

—

Output-only versions:

Eight push-pull outputs with selectable power-up

8

default levels

Push-pull outputs offer faster rise time than open-

drain 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

4

transition detection interrupt and selectable pullups.

Four push-pull outputs with selectable power-up

default levels.

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