Datasheet
MAX7320
I
2
C Port Expander with Eight Push-Pull Outputs
6 _______________________________________________________________________________________
PART
I
2
C
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
I
2
C SLAVE
ADDRESS
INPUTS
INTERRUPT
MASK
OPEN-
DRAIN
OUTPUTS
PUSH-
PULL
OUTPUTS
I
2
C DATA WRITE I
2
C DATA READ
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