MAX7312 2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection

Description

The MAX7312 2-wire-interfaced expander provides 16-bit parallel input/output (I/O) port expansion in SMBus™ and I²C applications. The MAX7312 consists of input port registers, output port registers, polarity inversion registers, configuration registers, a bus timeout register, and an I²C-compatible serial interface logic, compatible with SMBus. The system master can invert the MAX7312 input data by writing to the active-high polarity inversion register. The system master can enable or disable bus timeout by writing to the bus timeout register.

Any of the 16 I/O ports can be configured as an input or an output. A power-on reset (POR) initializes the 16 I/Os as inputs. Three address select pins configure the part to one of 64 slave ID addresses.

The MAX7312 supports hot insertion. All port pins, the active-low INT output, SDA, SCL, and the slave address inputs AD0-2 remain high impedance in power-down (V_t = 0V) up to 6V.

The MAX7312 is available in 24-pin SO, SSOP, TSSOP, and thin QFN packages and is specified over the -40°C to +125°C automotive temperature range.

For applications requiring I/Os with integrated 100kΩ pullup resistors, refer to the MAX7311 data sheet.

Key Features

Applications/Uses

400kbps I²C-Compatible Serial Interface
2V to 5.5V Operation
5V Overvoltage Tolerant I/Os
Supports Hot Insertion
16 I/O Pins that Default to Inputs on Power-Up
Open-Drain Interrupt Output (Active-Low INT)
Bus Timeout for Lock-Up-Free Operation
Noise Filter on SCL/SDA Inputs
64 User-Selectable Slave ID Addresses
Low Standby Current (2.9µA typ)
Polarity Inversion
4mm x 4mm, 0.8mm Thin QFN Package
-40°C to +125°C Operation

	Instrumentation and Test Measurement Networking
	Medical Equipment
	RAID Systems
	Servers/Blades

Key Specifications: I/O Port Expanders

Part Number

Features

Interface

Inputs/Outputs

Interrupt Output

Over-Voltage Protection

Drive Current (mA)

Supply Voltage (min) (V)

Supply Voltage (max) (V)

Price^**

MAX7312

•	64 Slave IDs

•	Transition Detection

Serial 2-Wire 400kbit

Yes

5.5V

5.5

$1.52 @ 1k

See All I/O Port Expanders (26)

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.

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
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Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
* 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: 1-16 of 16

MAX7312

Free
Sample

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Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX7312AWG+

SOIC(W);24 pin;166 mm²
Outline Drawing: 21-0042 (PDF)
Land Pattern: 90-0182 (PDF)
Use pkgcode/variation: W24+1*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX7312AWG+T

SOIC(W);24 pin;166 mm²
Outline Drawing: 21-0042 (PDF)
Land Pattern: 90-0182 (PDF)
Use pkgcode/variation: W24+1*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX7312AWG

SOIC(W);24 pin;166 mm²
Outline Drawing: 21-0042 (PDF)
Land Pattern: 90-0182 (PDF)
Use pkgcode/variation: W24-1*

-40°C to +125°C

RoHS/Lead-Free: No
Materials Analysis

MAX7312AWG-T

Land Pattern: Not Available

-40°C to +125°C

See data sheet

MAX7312AAG

SSOP;24 pin;66 mm²
Outline Drawing: 21-0056 (PDF)
Land Pattern: 90-0110 (PDF)
Use pkgcode/variation: A24-2*

-40°C to +125°C

RoHS/Lead-Free: No
Materials Analysis

MAX7312AAG-T

Land Pattern: Not Available

-40°C to +125°C

See data sheet

MAX7312AAG+

SSOP;24 pin;66 mm²
Outline Drawing: 21-0056 (PDF)
Land Pattern: 90-0110 (PDF)
Use pkgcode/variation: A24+2*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX7312AAG+T

SSOP;24 pin;66 mm²
Outline Drawing: 21-0056 (PDF)
Land Pattern: 90-0110 (PDF)
Use pkgcode/variation: A24+2*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX7312ATG

TQFN;24 pin;17 mm²
Outline Drawing: 21-0139 (PDF)
Land Pattern: 90-0022 (PDF)
Use pkgcode/variation: T2444-4*

-40°C to +125°C

RoHS/Lead-Free: No
Materials Analysis

MAX7312ATG-T

TQFN;24 pin;17 mm²
Outline Drawing: 21-0139 (PDF)
Land Pattern: 90-0022 (PDF)
Use pkgcode/variation: T2444-4*

-40°C to +125°C

RoHS/Lead-Free: No
Materials Analysis

MAX7312ATG+

TQFN;24 pin;17 mm²
Outline Drawing: 21-0139 (PDF)
Land Pattern: 90-0022 (PDF)
Use pkgcode/variation: T2444+4*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX7312ATG+T

TQFN;24 pin;17 mm²
Outline Drawing: 21-0139 (PDF)
Land Pattern: 90-0022 (PDF)
Use pkgcode/variation: T2444+4*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX7312AUG+

TSSOP;24 pin;52 mm²
Outline Drawing: 21-0066 (PDF)
Land Pattern: 90-0118 (PDF)
Use pkgcode/variation: U24+1*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX7312AUG

TSSOP;24 pin;52 mm²
Outline Drawing: 21-0066 (PDF)
Land Pattern: 90-0118 (PDF)
Use pkgcode/variation: U24-1*

-40°C to +125°C

RoHS/Lead-Free: No
Materials Analysis

MAX7312AUG-T

TSSOP;24 pin;52 mm²
Outline Drawing: 21-0066 (PDF)
Land Pattern: 90-0118 (PDF)
Use pkgcode/variation: U24-1*

-40°C to +125°C

RoHS/Lead-Free: No
Materials Analysis

MAX7312AUG+T

TSSOP;24 pin;52 mm²
Outline Drawing: 21-0066 (PDF)
Land Pattern: 90-0118 (PDF)
Use pkgcode/variation: U24+1*

-40°C to +125°C

RoHS/Lead-Free: Lead Free
Materials Analysis

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