NS7520B-1-C55

Overview

The NS7520B-1-C55 is a 32-bit system-on-a-chip ASIC from Digi International, based on the NET+ARM architecture. It integrates an ARM7TDMI processor core operating at a maximum frequency of 55 MHz with a 32-bit internal bus. The device features a 10/100 Mbps Ethernet MAC, two independent serial ports (UART/SPI), and a 13-channel DMA controller. It supports external memory interfaces for Flash, SDRAM, SRAM, and EEPROM via five chip selects. Power requirements include 3.3 V for I/O and 1.5 V for the core, housed in a 177-pin LFBGA package.

Feature Summary

• ARM7TDMI 32-bit RISC processor core with 32-bit internal bus
• Integrated 10/100 BaseT Ethernet MAC with MII interface
• Two independent serial ports supporting UART or SPI modes
• 13-channel DMA controller with dedicated channels for Ethernet and serial data

Applications

• Intelligent networked devices
• Internet appliances
• Embedded networking hardware

Procurement Notes

Verify the specific suffix 'C55' against the manufacturer's datasheet to confirm the 55 MHz operating grade and commercial temperature range specifications. Ensure design compatibility with the required 3.3 V I/O and 1.5 V core power supplies. Confirm that the 177-pin LFBGA packaging aligns with PCB layout capabilities.

Selection Notes

Select this component when a high-integration solution combining an ARM7TDMI CPU with native Ethernet and serial connectivity is required. Consider the 55 MHz maximum clock speed and the availability of five chip select lines for flexible external memory configurations. Evaluate the 16 GPIO pins and programmable timers for peripheral control needs.

Part Context

This part belongs to the NS7520 family within the NET+ARM™ series. Variants such as NS7520B-1-I46 and NS7520B-1-C36 offer different operating frequencies (46 MHz and 36 MHz) or industrial temperature ranges. The NS7520 serves as the hardware foundation for the NET+Works™ software development platform.

Replacement Considerations

Direct pin-compatible replacements are not explicitly documented in the provided source material. Alternative selections within the same NET+ARM family may require firmware adaptation due to differences in clock grades or temperature ratings.