Datasheet

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 industry-standard parts.
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 MAX7323 is a general-purpose port expander,
operating from a +1.71V to +5.5V supply, that provides
four push-pull output ports with 20mA sink, 10mA source
drive capability, and four open-drain I/O ports with a 20mA
sink capability. The four open-drain outputs are overvolt-
age protected to +6V independent of supply voltage.
The MAX7323 is set to one of 16 I
2
C slave addresses
(0x60 to 0x6F) using the address select inputs AD0 and
AD2, and is accessed over an I
2
C serial interface up to
400kHz. The RST input clears the serial interface in case
of a bus lockup, terminating any serial transaction to or
from the MAX7323.
Table 1. MAX7319–MAX7329 Family Comparison
PART
I
2
C
SLAVE
ADDRESS
INPUTS
INPUT
INTERRUPT
MASK
OPEN-
DRAIN
OUTPUTS
PUSH-
PULL
OUTPUTS
APPLICATION
8-PORT EXPANDERS
MAX7319 110xxxx 8 Yes — —
Input-only versions:
8 input ports with programmable latching transition
detection interrupt and selectable pullups.
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 — — — 8
Output-only versions:
8 push-pull outputs with selectable power-up default
levels.
Push-pull outputs offer faster rise time than open-
drain outputs, and require no pullup resistors.
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.
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.
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.
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Maxim Integrated │ 5
MAX7323 I
2
C Port Expander with 4 Push-Pull
Outputs and 4 Open-Drain I/Os