2
I C Port Expander with 12 Push-Pull Outputs
and 4 Open-Drain I/Os
2
The MAX7327 is set to two of 32 I C slave addresses
Detailed Description
(see Tables 2 and 3) using address inputs AD2 and
2
MAX7319–MAX7329 Family Comparison
The MAX7324–MAX7327 family consists of four pin-
compatible, 16-port expanders that integrate the func-
tions of the MAX7320 and one of either the MAX7319,
MAX7321, MAX7322, or MAX7323.
AD0, and is accessed over an I C serial interface up to
400kHz. Eight push-pull outputs use a different slave
address from the other four push-pull outputs and the
open-drain I/Os. The eight push-pull outputs, O8–O15,
use the 101xxxx addresses while the four outputs O0,
O1, O6, and O7 and the open-drain I/Os P2–P5 use
addresses with 110xxxx. The RST input clears the serial
interface in case of a bus lockup, terminating any serial
transaction to or from the MAX7327.
Functional Overview
The MAX7327 is a general-purpose port expander
operating from a +1.71V to +5.5V supply that provides
12 push-pull output ports with a 20mA sink, 10mA
source drive capability, and four open-drain I/O ports
with a 20mA sink capability. The four open-drain out-
puts are overvoltage protected to +6V.
Any of the four open-drain ports can be configured as a
logic input by setting the port output logic-high (logic-
high for an open-drain output is high impedance).
When the MAX7327 is read through the serial interface,
the actual logic levels at the ports are read back.
Table 1. MAX7319–MAX7329 Family Comparison
2
I C
INPUT
INTERRUPT
MASK
OPEN-
DRAIN
OUTPUTS OUTPUTS
PUSH-
PULL
SLAVE
ADDRESS
PART
INPUTS
CONFIGURATION
16-PORT EXPANDERS
8 inputs and 8 push-pull outputs version:
8 input ports with programmable latching transition
detection interrupt and selectable pullups.
8 push-pull outputs with selectable default logic
levels.
MAX7324
8
Yes
—
8
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.
8 I/O and 8 push-pull outputs version:
101xxxx
and
110xxxx
8 open-drain I/O ports with latching transition
detection interrupt and selectable pullups.
8 push-pull outputs with selectable default logic
levels.
MAX7325
Up to 8
—
Up to 8
8
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.
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