BQ4015LYMA-70N

Memory IC Overview

The BQ4015LYMA-70N is a nonvolatile SRAM IC manufactured by Texas Instruments, organized as 524,288 words by 8 bits (4 Mbit). It operates at a maximum access time of 70 ns with a supply voltage range of 3.0 V to 3.6 V. The device utilizes a 32-pin DIP module package and supports an operating temperature range from -40°C to 85°C.

Memory IC Feature Summary

• Integrates internal lithium coin cell for data retention exceeding 10 years without external power
• Automatically write-protects memory during power-down and power-up cycles
• Switches to internal backup supply when main supply falls below threshold
• Compatible with standard industry 4-Mb SRAM pinout

Memory IC Applications

• Industrial systems requiring reliable data preservation
• Data communications equipment
• High-speed microprocessor applications
• FPGA configuration storage
• ASIC data logging

Memory IC Procurement Notes

Verify component authenticity through authorized distributors or TI directly. Confirm the specific suffix 'N' matches design requirements. Check current production status as obsolete parts may require lifecycle management strategies. Ensure environmental compliance documentation aligns with project specifications.

Memory IC Selection Notes

Select this variant specifically for 3.3-V system designs requiring extended industrial temperature ranges. Verify that the 70-ns speed meets timing constraints. Consider the 32-DIP module form factor for through-hole mounting needs. Evaluate total system cost including potential lifetime-buy periods due to obsolescence.

Memory IC Part Context

This part belongs to the bq4015/Y/LY family of nonvolatile SRAMs. It shares architectural similarities with the 5-V variants but is optimized for lower voltage operation. The LY designation indicates 3.3-V compatibility, while the MA suffix denotes the 32-pin DIP module package type used in legacy industrial designs.

Memory IC Replacement Considerations

DS1250AB-70+ Analog Devices Inc./Maxim Integrated

Memory IC FAQ

How does the device handle power failures?

The control circuitry monitors VCC and automatically switches to the internal lithium backup supply when voltage drops below the power-fail-detect threshold, preserving data.

What is the data retention period?

The integral lithium cells provide data retention for more than 10 years in the absence of system power at 25°C.

Is external circuitry required for nonvolatility?

No, the bq4015LYMA-70N requires no external circuitry as it integrates the control logic and energy source within the module.