and 8 Open-Drain I/Os

6

_______________________________________________________________________________________

PART

SLAVE

ADDRESS

INPUTS

INPUT

INTERRUPT

MASK

OPEN-

DRAIN

OUTPUTS

PUSH-

PULL

OUTPUTS

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

101xxxx

and

110xxxx

Up to 4

—

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.

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 logic-

high. Transition flags identify which open-drain port

inputs have changed (even if only for a transient)

since the ports were last read.

8-PORT EXPANDERS

MAX7319

110xxxx

8

Yes

—

—

Input-only versions:

8 input ports with programmable latching transition

detection interrupt and selectable pullups.

MAX7320

101xxxx

——

—

8

Output-only versions:

8 push-pull outputs with selectable power-up default

levels.

MAX7321

110xxxx

Up to 8

—

Up to 8

—

I/O versions:

8 open-drain I/O ports with latching transition

detection interrupt and selectable pullups.

MAX7322

110xxxx

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)