6

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PART

SLAVE

ADDRESS

INPUTS

INPUT

INTERRUPT

MASK

OPEN-

DRAIN

OUTPUTS

PUSH-

PULL

OUTPUTS

APPLICATION

MAX7323

110xxxx

Up to 4

—

Up to 4

4

Four I/O, four output-only versions:

Four open-drain I/O ports with latching transition

detection interrupt and selectable pullups.

Four push-pull outputs with selectable power-up

default levels.

MAX7328

MAX7329

0100xxx

0111xxx

Up to 8

—

Up to 8

—

PCF8574-, PCF8574A-compatible versions:

Eight 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 MAX7321.

MAX7325

Up to 8

—

Up to 8

8

Software equivalent to a MAX7320 plus a MAX7319.

MAX7326

4

Yes

—

12

Software equivalent to a MAX7320 plus a MAX7322.

MAX7327

101xxxx

and

110xxxx

Up to 4

—

Up to 4

12

Software equivalent to a MAX7320 plus a MAX7323.

Table 1. MAX7319–MAX7329 Family Comparison (continued)

PART

ADDRESS

INPUTS

INTERRUPT

MASK

OPEN-

DRAIN

OUTPUTS

PUSH-

PULL

OUTPUTS

MAX7319

110xxxx

8

Yes

—

—

<I7–I0 interrupt

mask>

<I7–I0 port inputs>

<I7–I0 transition flags>

MAX7320

101xxxx

—

—

—

8

<O7–O0 port

outputs>

<O7-O0 port inputs>

MAX7321

110xxxx

Up to 8

—

Up to 8

—

<P7–P0 port

outputs>

<P7–P0 port inputs>

<P7–P0 transition flags>

MAX7322

110xxxx

4

Yes

—

4

<O7, O6 outputs,

I5–I2 interrupt

mask, O1, O0

outputs>

<O7, O6, I5–I2, O1, O0 port

inputs>

<0, 0, I5–I2 transition flags,

0, 0>

MAX7323

110xxxx

Up to 4

—

Up to 4

4

<port outputs>

<O7, O6, P5–P2, O1, O0 port

inputs>

<0, 0, P5-P2 transition flags,

0, 0>

MAX7328

0100xxx

Up to 8

—

Up to 8

—

<P7–P0 port

outputs>

<P7–P0 port inputs>

MAX7329

0111xxx

Up to 8

—

Up to 8

—

<P7–P0 port

outputs>

<P7–P0 port inputs>

Table 2. Read and Write Access to Eight-Port Expander Family