AT27C256R-70RC

Memory IC Overview

The AT27C256R-70RC is a low-power, high-performance 262,144-bit one-time programmable read-only memory (OTP EPROM) organized as 32K by 8 bits. It features a fast access time of 70 ns and operates on a single 5V ± 10% supply in normal read mode. The device utilizes scaled CMOS technology to provide low active power consumption of 20 mA at 5 MHz and standby current of 100 µA maximum. It includes an integrated product identification code and supports the Rapid™ programming algorithm with a typical programming time of 100 µs per byte.

Memory IC Feature Summary

• Low-power CMOS operation with minimal standby and active current consumption
• Integrated product identification code for automated programming equipment compatibility
• Rapid™ programming algorithm ensuring reliable data writing
• Two-line control (CE, OE) to prevent bus contention

Memory IC Applications

• Firmware storage in microprocessor systems
• Industrial temperature range applications (-40°C to 85°C)
• Automotive temperature range applications (-40°C to 125°C)

Memory IC Procurement Notes

Verify that the ordering suffix 'RC' corresponds to the 28-Lead Plastic Gull Wing Small Outline (SOIC) package and the Commercial temperature range (0°C to 70°C). Confirm the specific speed grade matches the required system timing constraints. Ensure the OTP nature of the device aligns with the production programming workflow, as data cannot be erased once written.

Memory IC Selection Notes

Select this component when a 32K x 8 bit non-volatile storage solution is required with a 70 ns access time. The SOIC package is suitable for surface mount assembly. Consider the commercial temperature range limits. Verify that the system design accommodates the 5V supply requirement and the specific VPP voltage needed during the programming phase.

Memory IC Part Context

This part belongs to the AT27C256R series of 256K-bit OTP EPROMs manufactured by Microchip Technology (formerly Atmel). The series offers various speed grades and package options, including PLCC, PDIP, SOIC, and TSOP. The device is designed for high-reliability applications requiring robust ESD protection and latchup immunity.

Memory IC Replacement Considerations

Compatible substitutes include other AT27C256R variants with different speed grades or packages, such as AT27C256R-45RC or AT27C256R-90RC. Cross-brand replacements require verification of pinout compatibility, voltage levels, and timing parameters.