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

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 (Vt = 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
  • 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
MAX7312: Block Diagram
MAX7312: Block Diagram
Applications/Uses
  • Instrumentation and Test Measurement Networking
  • Medical Equipment
  • RAID Systems
  • Servers/Blades
DataSheet
titleDownload file
MAX7312 Data SheetMAX7312.pdf
Parametrics
Part NumberInterfaceI/OInterr.OutOver Voltage Protection
(V)
Drive Current
(mA)
VSUPPLY
(V)
VSUPPLY
(V)
Package/PinsBudgetary
Price
minmaxSee Notes
MAX7312Serial 2-Wire 400kbit16Yes5.54025.5SOIC(W)/24
SSOP/24
TQFN/24
TSSOP/24
$2.36 @1k
Design kits & evaluation modules
Quality and Environmental Data
Related Products
  • MAX7318:2-Wire-Interfaced, 16-Bit, I/O Port Expander with Interrupt and Hot-Insertion Protection
  • MAX7317:10-Port SPI-Interfaced I/O Expander with Overvoltage and Hot-Insertion Protection
  • MAX6964:17-Output LED Driver/GPO with Intensity Control and Hot-Insertion Protection
  • MAX7314:18-Port GPIO with LED Intensity Control, Interrupt, and Hot-Insertion Protection
  • MAX7316:10-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection
  • MAX7315:8-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection
  • MAX7313:16-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection
  • MAX6965:9-Output LED Driver with Intensity Control and Hot-Insertion Protection
  • MAX7311:2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection
  • MAX7310:2-Wire-Interfaced 8-Bit I/O Port Expander with Reset
  • MAX7300:2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander
  • MAX6956:2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander
  • MAX7301:4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port I/O Expander
  • MAX6957:4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port LED Display Driver and I/O Expander
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX7312AAGNo Longer AvailableMAX7312AAG+SSOP,;24 pin;65.8 mm²-40°C to +125°CNo
MAX7312AAG+ActiveSSOP,;24 pin;65.8 mm²-40°C to +125°CLead Free
MAX7312AAG+TActiveSSOP,;24 pin;65.8 mm²-40°C to +125°CLead Free
MAX7312AAG-TNo Longer AvailableMAX7312AAG+TSSOP;24 pin-40°C to +125°CSee data sheet
MAX7312ATGNo Longer AvailableMAX7312ATG+TQFN,;24 pin;16.8 mm²-40°C to +125°CNo
MAX7312ATG+ActiveTQFN,;24 pin;16.8 mm²-40°C to +125°CLead Free
MAX7312ATG+TActiveTQFN,;24 pin;16.8 mm²-40°C to +125°CLead Free
MAX7312ATG-TNo Longer AvailableMAX7312ATG+TQFN;24 pin-40°C to +125°CSee data sheet
MAX7312AUGNo Longer AvailableMAX7312AUG+TSSOP,;24 pin;52.4 mm²-40°C to +125°CNo
MAX7312AUG+ActiveTSSOP,;24 pin;52.4 mm²-40°C to +125°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX7312AUG+TActiveTSSOP,;24 pin;52.4 mm²-40°C to +125°CLead Free
MAX7312AUG-TNo Longer AvailableMAX7312AUG+TTSSOP;24 pin-40°C to +125°CSee data sheet
MAX7312AWGNo Longer AvailableMAX7312AWG+SOIC(W),;24 pin;166.1 mm²-40°C to +125°CNo
MAX7312AWG+ActiveSOIC(W),;24 pin;166.1 mm²-40°C to +125°CLead Free
MAX7312AWG+TActiveSOIC(W),;24 pin;166.1 mm²-40°C to +125°CLead Free
MAX7312AWG-TNo Longer AvailableMAX7312AWG+TW.SO;24 pin-40°C to +125°CSee data sheet
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