MAX7319 Maxim, MAX7319 Datasheet - Page 5

• Manufacturer Part Number: MAX7319
• Description: The MAX7319 2-wire serial-interfaced peripheral features eight input ports with selectable internal pullups, overvoltage protection to +6V, and transition detection with interrupt output
• 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 second sources to the PCF8574 and
PCF8574A.
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
ADDRESS
110xxxx
101xxxx
110xxxx
110xxxx
SLAVE
I
2
C
_______________________________________________________________________________________
I
2
Detailed Description
C Port Expander with Eight Inputs and
INPUTS
Up to 8
—
8
4
INTERRUPT
INPUT
MASK
Yes
Yes
—
—
Maskable Transition Detection
OUTPUTS
Up to 8
OPEN-
DRAIN
—
—
—
OUTPUTS
PUSH-
PULL
The MAX7319 is a general-purpose port expander,
operating from a +1.71V to +5.5V supply that provides
eight CMOS input ports that are overvoltage protected
to +6V independent of supply voltage.
The MAX7319 is set to one of 16 I
(0x60 to 0x6F) using the address-select inputs AD2
and AD0, and is accessed over an I
The RST input clears the serial interface in case of a
hung bus, terminating any serial transaction to or from
the MAX7319.
The input ports offer latching transition detection func-
tionality. All input ports are continuously monitored for
—
—
8
4
Input-only versions:
Eight 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:
Eight 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:
Eight 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.
Four input-only, four output-only versions:
Four input ports with programmable latching
transition detection interrupt and selectable pullups.
Four push-pull outputs with selectable power-up
default levels.
APPLICATION
Functional Overview
2
C slave addresses
2
C serial interface.
5