DS4550E

Overview

The DS4550E is a nonvolatile I/O expander manufactured by Analog Devices Inc./Maxim Integrated. It features nine bidirectional I/O lines and supports I2C and JTAG interfaces with a maximum clock frequency of 400 kHz. The device operates within a supply voltage range of 2.7 V to 5.5 V and functions across an industrial temperature range from -40°C to +85°C. Packaged in a 20-TSSOP format, it integrates EEPROM for data retention and includes power-on reset (POR) circuitry. Output drivers are configured as open-drain with a sink current capacity of 16 mA.

Feature Summary

• Integrates nonvolatile EEPROM storage directly within the I/O expander architecture
• Supports dual interface protocols including standard I2C and JTAG access
• Includes built-in power-on reset logic to ensure reliable initialization

Applications

• Embedded systems requiring persistent configuration storage alongside general-purpose I/O expansion
• Industrial control modules utilizing JTAG for debugging and programming
• Consumer electronics needing low-pin-count interface solutions with data retention capabilities

Procurement Notes

Verify component authenticity through authorized distribution channels due to potential availability constraints. Confirm package integrity and pin alignment against the 20-TSSOP specification before integration. Ensure supply chain documentation matches the specific manufacturer designation to avoid counterfeit risks during procurement processes.

Selection Notes

Select this component when both I/O expansion and nonvolatile memory storage are required in a single package. Verify that the system design accommodates the open-drain output configuration and 16 mA sink capability. Ensure the host controller supports either I2C or JTAG communication protocols for proper device interaction and data management.

Part Context

This part belongs to the Maxim Integrated I/O expander family designed for space-constrained applications. It combines standard peripheral expansion with embedded storage, reducing board complexity compared to separate I/O and EEPROM components. The device targets applications where data persistence is critical without adding external memory chips.

Replacement Considerations

The DS4550E+ serves as the lead-free compliant replacement for the DS4550E. Verify pin compatibility and electrical specifications remain identical between the legacy and RoHS-compliant versions before substitution.