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.
* 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:
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MAX7327
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TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
MAX7327AEG
Active
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.