AT27C256R-55JC

Memory IC Overview

The AT27C256R-55JC 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 random access time of 55 ns and operates on a single 5V ± 10% power supply. The device utilizes scaled CMOS technology to achieve low active power consumption of 20 mA at 5 MHz and standby current of 100 µA maximum. It supports JEDEC standard packages, including the 32-Lead Plastic J-Leaded Chip Carrier (PLCC), and provides two-line control for bus contention prevention.

Memory IC Feature Summary

• Low-power CMOS operation with rapid programming algorithm
• High reliability with ESD protection and latchup immunity
• CMOS and TTL compatible inputs and outputs
• Integrated product identification code

Memory IC Applications

• Firmware storage in microprocessor systems
• Industrial control applications
• Automotive electronics
• Commercial embedded systems

Memory IC Procurement Notes

Verify that the component is an OTP EPROM requiring specific programming voltages (VPP = 13.0V). Confirm package integrity for the 32-Lead PLCC variant. Ensure system design accommodates transient voltage excursions during mode switching by utilizing appropriate decoupling capacitors near VCC and GND terminals.

Memory IC Selection Notes

Select this part for designs requiring non-volatile firmware storage without the complexity of erasable EPROMs. The -55 speed grade offers a balance between performance and power consumption. Verify compatibility with existing programming equipment supporting the Rapid™ Programming Algorithm and integrated product identification codes for automated manufacturing processes.

Memory IC Part Context

This component belongs to the AT27C256R series of 256K-bit OTP EPROMs manufactured by Microchip Technology (formerly Atmel). The series includes various speed grades and temperature ranges, all sharing the same 32K x 8 bit organization and 5V supply requirement. The 'JC' suffix specifically denotes the Commercial temperature range and 32-Lead PLCC package.

Memory IC Replacement Considerations

AT27C256R-45JC

Memory IC FAQ

What are the required programming voltages for the AT27C256R?

Programming requires VCC = 6.5V and VPP = 13.0V.

How does the Integrated Product Identification Code function?

It electronically identifies the manufacturer and device type using specific address configurations, allowing standard programmers to select correct algorithms.