MAX7318 2-Wire-Interfaced, 16-Bit, I/O Port Expander with Interrupt and Hot-Insertion Protection

Description

The MAX7318 2-wire-interfaced expander provides 16-bit parallel input/output (I/O) port expansion for SMBus™ and I²C applications. The MAX7318 consists of input port registers, output port registers, polarity inversion registers, configuration registers, and an I²C-compatible serial interface logic compatible with SMBus. The system master can invert the MAX7318 input data by writing to the active-high polarity inversion register.

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

The MAX7318 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+ = 0V) with up to 6V asserted upon them.

The MAX7318 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 an SMBus timeout function, refer to the MAX7311 data sheet.

Key Features

Applications/Uses

400kbps I²C-Compatible Serial Interface
2V to 5.5V Operation
5.5V Overvoltage-Tolerant I/Os
Supports Hot Insertion
16 I/O Pins that Default to Inputs on Power-Up
100kΩ Pullup on Each I/O
Open-Drain Interrupt Output (Active-Low INT)
Noise Filter on SCL/SDA Inputs
64 Slave ID Addresses Available
Low Standby Current (5.4µA typ)
Polarity Inversion
4mm x 4mm, 0.8mm Thin QFN Package
-40°C to +125°C Operation

	Industrial Control
	Instrumentation and Test Measurement
	Medical Equipment
	PLCs
	RAID Systems
	Servers

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^**

MAX7318

•	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: 1-14 of 14

MAX7318

Free
Sample

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Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX7318AWG

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

MAX7318AWG-T

Land Pattern: Not Available

-40°C to +125°C

See data sheet

MAX7318AAG+

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

MAX7318AAG+T

Land Pattern: Not Available

-40°C to +125°C

See data sheet

MAX7318AAG

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

MAX7318AAG-T

Land Pattern: Not Available

-40°C to +125°C

See data sheet

MAX7318ATG-T

Land Pattern: Not Available

-40°C to +125°C

See data sheet

MAX7318ATG

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

MAX7318ATG+

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

MAX7318ATG+T

Land Pattern: Not Available

-40°C to +125°C

See data sheet

MAX7318AUG

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

MAX7318AUG-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

MAX7318AUG+

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

MAX7318AUG+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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