MAX7300ATL+T

Overview

The MAX7300ATL+T is a serial-interfaced I/O expansion peripheral manufactured by Analog Devices Inc./Maxim Integrated. It provides up to 28 user-configurable ports (P4–P31) in a 40-pin TQFN-EP package. The device operates on a supply voltage range of 2.5V to 5.5V and supports an I²C-compatible 2-wire serial interface with a maximum clock frequency of 400 kHz. Each port can be configured as a push-pull logic output capable of sinking 10mA and sourcing 4.5mA, or as a Schmitt-trigger logic input with optional internal pullup. Seven ports feature configurable transition detection logic that generates an interrupt upon detecting changes in the port logic level.

Feature Summary

• Configurable I/O Ports: Individual ports support push-pull outputs or Schmitt-trigger inputs with selectable internal pullups.
• Transition Detection: Monitors seven specific ports for logic level changes and triggers an interrupt flag.
• Low Power Shutdown: Features a shutdown mode with minimal supply current while retaining register data.

Applications

• White Goods
• Industrial Controllers
• System Monitoring

Procurement Notes

Verify the component against official Maxim Integrated datasheets to confirm pinout compatibility and electrical specifications. Ensure the ordering suffix matches the required lead-free/RoHS-compliant status and tape-and-reel packaging format. Cross-reference the manufacturer part number with authorized distributors to validate authenticity and traceability before integration into production systems.

Selection Notes

Select this model when a 40-pin surface-mount package is required for high-density designs. Choose this variant over the 28-port SSOP versions if the application demands the specific thermal performance and footprint of the TQFN-EP package. Verify that the system requires exactly 28 available I/O lines rather than the 20 lines provided by the smaller package options.

Part Context

This component belongs to the MAX7300 series of compact, serial-interfaced I/O expanders. It is designed to provide microprocessors with additional general-purpose input/output capabilities via a standard two-wire interface. The device serves as a bridge between low-pin-count processors and external peripherals requiring expanded control or monitoring lines.

Replacement Considerations

For SPI-interfaced applications, refer to the MAX7301 data sheet. For pin-compatible port expanders with additional constant-current LED drive capability, refer to the MAX6956 data sheet. Other variants within the MAX7300 family offer different pin counts and packages but share similar functional characteristics.