AT27LV256A-55JU

Memory IC Overview

The AT27LV256A-55JU is a 262,144-bit (32K x 8) one-time programmable read-only memory (OTP EPROM) manufactured by Microchip Technology. It features a fast 55 ns access time and supports dual voltage operation: 3.0V to 3.6V or standard 5V ± 10%. The device operates in an industrial temperature range of -40°C to +85°C and is housed in a 32-lead Plastic J-leaded Chip Carrier (PLCC) package.

Memory IC Feature Summary

• Dual voltage range operation for compatibility with both low-voltage and standard 5V systems
• Low-power CMOS technology providing high standby efficiency
• Integrated product identification code for automated programming verification
• Rapid programming algorithm ensuring reliable data writing

Memory IC Applications

• Portable battery-powered systems requiring low power consumption
• Industrial control applications within specified temperature ranges
• Systems requiring pin-compatible upgrades from standard 5V OTP EPROMs

Memory IC Procurement Notes

Verify the specific ordering suffix 'JU' corresponds to the Green (Pb/Halide-free) packaging option as defined in the official datasheet. Confirm that the selected package type matches the required PCB footprint, specifically the 32-lead PLCC configuration. Ensure programming equipment supports the integrated product identification codes for proper algorithm selection.

Memory IC Selection Notes

Select this component when a non-volatile storage solution with rapid access speeds is required for portable or industrial designs. The dual voltage capability allows flexibility in system architecture, supporting both 3.3V and 5V logic levels. Consider the 32-lead PLCC package constraints during layout planning and ensure the design accommodates the necessary decoupling capacitors for stable operation.

Memory IC Part Context

This part belongs to the AT27LV256A series of low-voltage OTP EPROMs. It serves as a direct pin-compatible replacement for the JEDEC standard AT27C256R, facilitating easier migration to lower voltage environments without redesigning the host board. The series emphasizes high reliability through robust ESD protection and latchup immunity.

Memory IC Replacement Considerations

The AT27LV256A-55JI is a functional equivalent offering identical electrical characteristics but utilizes standard leaded packaging instead of the halide-free 'JU' variant. Both parts share the same pinout and operational parameters, allowing for interchangeability based on environmental compliance requirements.

Memory IC FAQ

How does the AT27LV256A handle bus contention?

The device utilizes two-line control via the Chip Enable (CE) and Output Enable (OE) pins, providing designers with the flexibility to prevent bus contention effectively.

What are the supply voltage requirements for programming?

Programming modes require VCC = 6.5V and VPP = 13.0V, which differs from the normal read mode voltages of 3.0V-3.6V or 5V.