CAT93C56LI-G

Memory IC Overview

The CAT93C56LI-G is a 2-kb Microwire serial CMOS EEPROM manufactured by onsemi, housed in an 8-pin PDIP package. It supports a supply voltage range of 1.8 V to 5.5 V and operates within an industrial temperature range of -40°C to +85°C. The device offers high-speed operation up to 2 MHz and features selectable memory organization as either 256 x 8 or 128 x 16 bits via the ORG pin. Key electrical characteristics include a maximum access time of 250 ns, write endurance of 1,000,000 cycles, and data retention of 100 years.

Memory IC Feature Summary

• Supports sequential read operations with automatic address incrementing for efficient data retrieval.
• Includes on-chip Power-On Reset circuitry to prevent incorrect logic states during power-up.
• Features software-based write protection and power-up inadvertent write protection mechanisms.

Memory IC Applications

• Non-volatile data storage in microprocessor systems
• Configuration parameter storage in embedded controllers
• Calibration data retention in industrial instrumentation

Memory IC Procurement Notes

Verify that the specific ordering suffix 'L' corresponds to the Industrial temperature grade (-40°C to +85°C) and the 'PDIP-8' package type required for your design. Confirm lead finish specifications, which are typically NiPdAu for this suffix combination. Ensure compatibility with existing PCB footprints for through-hole mounting before finalizing procurement.

Memory IC Selection Notes

Select this component when a robust, low-power serial EEPROM with Microwire interface is needed for industrial environments. The CAT93C56 variant provides 8-bit word width, suitable for applications requiring 256 addressable locations. Consider the CAT93C57 if 16-bit word width is preferred, noting it is not recommended for new designs.

Memory IC Part Context

This part belongs to the CAT93C56/57 family of 2-Kb Microwire Serial CMOS EEPROMs from onsemi. The family is designed for use with industry-standard microprocessors, offering flexible memory organization and self-timed internal write cycles. The CAT93C56 specifically targets applications requiring 8-bit data words, distinguishing it from the 16-bit CAT93C57.

Memory IC Replacement Considerations

The datasheet explicitly states that the CAT93C57 is not recommended for new designs and should be replaced with the CAT93C56. No other direct substitute part numbers are provided in the documentation for the CAT93C56LI-G.

Memory IC FAQ

How is the memory organization selected?

Memory organization is selected by connecting the ORG pin to VCC for 128 x 16 configuration or to GND for 256 x 8 configuration. If left unconnected, an internal pullup selects the x16 organization.

What is the function of the EWEN and EWDS instructions?

The EWEN (Erase/Write Enable) instruction enables write and erase operations, while the EWDS (Erase/Write Disable) instruction disables them to prevent accidental writing. The device powers up in the write disable state.