MAX7323 Maxim, MAX7323 Datasheet - Page 5

• Manufacturer Part Number: MAX7323
• Description: The MAX7323 2-wire serial-interfaced peripheral features eight I/O ports
• Manufacturer: Maxim

The MAX7319–MAX7323 family consists of five pin-
compatible, eight-port expanders. Each version is opti-
mized 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 func-
tions of the MAX7320 and one of either the MAX7319,
MAX7321, MAX7322, or MAX7323.
Table 1. MAX7319–MAX7329 Family Comparison
8-PORT EXPANDERS
MAX7319
MAX7320
MAX7321
MAX7322
PART
MAX7319–MAX7329 Family Comparison
I
ADDRESS
2
110xxxx
101xxxx
110xxxx
110xxxx
SLAVE
C Port Expander with 4 Push-Pull Outputs
I
2
C
_______________________________________________________________________________________
Detailed Description
INPUTS
Up to 8
—
8
4
INTERRUPT
INPUT
MASK
Yes
Yes
—
—
OUTPUTS
Up to 8
OPEN-
DRAIN
—
—
—
OUTPUTS
PUSH-
The MAX7323 is a general-purpose port expander, oper-
ating 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 overvoltage
protected to +6V independent of supply voltage.
The MAX7323 is set to one of 16 I
(0x60 to 0x6F) using the address select inputs AD0 and
AD2, and is accessed over an I
400kHz. The RST input clears the serial interface in
case of a bus lockup, terminating any serial transaction
to or from the MAX7323.
PULL
—
—
8
4
and 4 Open-Drain I/Os
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.
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.
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.
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.
APPLICATION
Functional Overview
2
C serial interface up to
2
C slave addresses
5