The MAX7327, a 2-wire serial-interfaced peripheral, features 12 push-pull outputs and four configurable open-drain I/O ports with selectable internal pullups and transition detection. Ports are overvoltage protected to +6V, independent of supply voltage.
The four I/O ports configured as inputs are continuously monitored for state changes (transition detection). State changes are indicated by the open-drain, +6V-tolerant active-low INT output. The interrupt is latched, detecting transient changes. When the MAX7327 is subsequently accessed through the serial interface, any pending interrupt is cleared. The 12 push-pull and the four open-drain outputs are rated to sink 20mA, and are capable of driving
LEDs. The active-low RST input clears the serial interface, terminating
any I²C communication to or from the MAX7327.
The MAX7327 uses two address inputs with four-level logic to allow 16 I²C slave addresses. The slave address also determines the power-up logic state for the I/O ports, and enables or disables internal 40k pullups in groups of two ports.
The MAX7327 is one device in a family of pin-compatible port expanders with a choice of input ports, open-drain I/O ports, and push-pull output ports (see Table 1 in the full data sheet).
The MAX7327 is available in the 24-pin QSOP and TQFN packages, and is specified over the -40°C to +125°C automotive temperature range.
Key Features
Applications/Uses
400kHz I²C Serial Interface
+1.71V to +5.5V Operating Voltage
12 Push-Pull Output Ports, Rated at 20mA Sink Current
4 Open-Drain I/O Ports, Rated at 20mA Sink Current
I/O Ports are Overvoltage Protected to +6V
Selectable I/O Port Power-Up Default Logic States
Transient Changes are Latched, Allowing Detection Between Read Operations
Notes: **This pricing is BUDGETARY, for comparing similar parts. Prices are in
U.S. dollars and subject to change. Quantity pricing may vary
substantially and international prices may differ due to local
duties, taxes, fees, and exchange rates. For volume-specific prices
and delivery, please see the price and availability page
or contact an authorized distributor.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices:
1-4
of
4
MAX7327
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
MAX7327AEG
QSOP;24 pin;54 mm²
Outline Drawing: 21-0055 (PDF)
Land Pattern: 90-0172 (PDF)
Use pkgcode/variation: E24-1*
MAX7322 I²C Port Expander with 4 Push-Pull Outputs and 4 Inputs MAX7319 I²C Port Expander with Eight Inputs and Maskable Transition Detection MAX7320 I²C Port Expander with Eight Push-Pull Outputs MAX7321 I²C Port Expander with 8 Open-Drain I/Os MAX7323 I²C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os MAX7328, MAX7329 I²C Port Expanders with Eight I/O Ports
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pullups in groups of two ports.
