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Microchip Technology AT27C512R-55RC
- Part No.:
- AT27C512R-55RC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27C512R-55RC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,692
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Product details
Overview
AT27C512R-55RC from Atmel is a 512 Kbit (64K × 8) one-time programmable EPROM optimized for fast, low-power read operations in embedded firmware storage applications. It delivers 55 ns access time, operates from a single 5V ±10% supply, supports CMOS/TTL-compatible I/O, and features dual-line control (CE/OE) to prevent bus contention in microprocessor systems.
For engineers reviewing the AT27C512R-55RC datasheet, AT27C512R-55RC pinout, AT27C512R-55RC application, or AT27C512R-55RC equivalent, this device serves as a drop-in replacement for legacy 27C512 variants in industrial control, boot code storage, and FPGA configuration memory where OTP reliability and JEDEC-standard SOIC packaging are required.
Technical Context
The AT27C512R-55RC implements a standard OTP EPROM architecture with address decoding for A0–A15, 8-bit bidirectional data outputs (O0–O7), and dual enable logic (CE active-low, OE/VPP multiplexed for output enable or programming voltage). Its Rapid™ Programming Algorithm enables 100 µs/byte typical write cycles at VCC = 6.5 V and OE/VPP = 13.0 V.
It integrates product identification logic (Manufacturer ID = 0x1E, Device ID = 0x0D) accessed via A9 high-voltage (12.0 V ±0.5 V) and A0 toggling, supporting automated programming equipment recognition. The device guarantees latchup immunity of 200 mA and ESD protection up to 2,000 V per HBM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8); sufficient for full microcontroller boot firmware or FPGA configuration bitstreams. |
| Access Time | 55 ns max; eliminates WAIT states on 12–18 MHz Z80, 8051, or 68K-based systems. |
| VCC Supply | 5 V ±10%; compatible with standard TTL/CMOS logic rails without regulation overhead. |
| Active Current | 20 mA max at 5 MHz; enables low-heat operation in dense PCB layouts with multiple EPROMs. |
| Standby Current | 100 µA max; reduces quiescent power in battery-backed or sleep-mode subsystems. |
| Programming Voltage | VPP = 13.0 V ±0.25 V on OE/VPP pin; requires dedicated programmer support, not system-level generation. |
| Operating Range | Commercial (0°C to +70°C); validated for stable timing and retention in office and lab environments. |
Pinout & Package
AT27C512R-55RC is packaged in a 28-lead, 0.330" wide plastic gull-wing small outline (SOIC), JEDEC MS-012 compliant, with 1.27 mm pitch and surface-mount compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; selects one of 64K bytes during read or program cycles. |
| O0–O7 | Data Outputs | 8-bit bidirectional data path; outputs valid data when CE and OE both low; high-impedance otherwise. |
| CE | Chip Enable | Active-low global chip select; disables outputs and reduces current to standby level when high. |
| OE/VPP | Output Enable / Programming Voltage | Low during read enables data output; driven to 13 V during programming to activate internal fuse-link circuitry. |
| VCC | Power Supply | +5 V ±10% main supply; powers all internal logic and output drivers during read mode. |
| GND | Ground Reference | Signal and power return; requires local 0.1 µF ceramic decoupling per device per datasheet layout guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming | 100 µs/byte typical; cuts firmware update time by >5× vs. legacy 27C512, accelerating production programming throughput. |
| Integrated ID Code | Manufacturer ID (0x1E) and Device ID (0x0D) accessible via A9=12 V and A0 toggle; enables auto-detection in universal programmers. |
| JEDEC Standard Packages | SOIC (28R) footprint matches industry-standard 28-pin EPROM footprints; allows direct PCB reuse from 27C256/27C512 designs. |
| High-Reliability CMOS | 2,000 V HBM ESD rating and 200 mA latchup immunity; ensures robustness in manual handling and noisy industrial environments. |
| Two-Line Control | Independent CE and OE pins allow flexible bus arbitration-OE can be held low while CE toggles to minimize output glitches. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic firmware in programmable logic controllers operating in factory-floor environments with temperature cycling and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 55 ns instruction fetch timing to ensure real-time scan cycle consistency. Use Value: OTP architecture prevents accidental overwrite during field maintenance; SOIC package enables automated reflow assembly and long-term data retention (>10 years). |
Use Scenario: Hosting startup code for 8-bit microcontrollers (e.g., Intel 8051, Zilog Z8) in medical instrumentation where firmware integrity is critical. IC Role / Device Role / Timing Role: Read-only memory mapped into CPU address space; provides zero-wait-state execution at 12 MHz clock rates. Use Value: 5 V single-supply operation simplifies power design; CMOS/TTL compatibility avoids level-shifter components in mixed-logic systems. |
| FPGA Configuration Memory | Embedded System BIOS Storage |
|
Use Scenario: Holding static configuration bitstreams for Xilinx XC4000 or Altera MAX 5000-series FPGAs in test equipment and avionics subsystems. IC Role / Device Role / Timing Role: Parallel-programmable configuration store; loaded at power-on reset before FPGA logic initialization. Use Value: 64K × 8 capacity accommodates full bitstream for mid-complexity FPGAs; 2,000 V ESD rating protects against handling damage during board rework. |
Use Scenario: Storing BIOS/UEFI initialization routines in embedded x86 or PowerPC-based control modules used in telecom base stations. IC Role / Device Role / Timing Role: Primary boot ROM accessed during cold start; supports fast read access to minimize boot latency. Use Value: 55 ns access time meets sub-100 ns timing budgets for early-stage CPU fetch; commercial temp range aligns with controlled indoor deployment conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-55PC | Same core spec but in 28-lead PDIP (28P6); no SOIC footprint; slightly higher 70 ns access time variant available. | Used where through-hole assembly or socket-based prototyping is required; unsuitable for SMT production. | Select AT27C512-55PC only if PDIP mechanical fit or hand-soldering is mandatory; AT27C512R-55RC offers superior thermal performance and density. |
| MX27C512-55PC | Macronix second-source part; identical 55 ns access, 5 V supply, and pinout; differs in programming voltage tolerance (12.5 V ±0.5 V vs. 13.0 V ±0.25 V). | Valid for cost-sensitive industrial OEMs seeking multi-source assurance without redesign. | MX27C512-55PC is functionally interchangeable in read mode; verify programmer compatibility with VPP tolerance before volume deployment. |
Compared with AT27C512-55PC and MX27C512-55PC, the AT27C512R-55RC uniquely combines SOIC packaging, guaranteed 55 ns access, and integrated ID code-making it optimal for automated SMT production of compact, high-reliability embedded systems requiring verified firmware immutability.
Availability
AT27C512R-55RC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, FPGA configuration memory, and embedded system BIOS storage requiring stable component supply across extended production lifecycles.
Supply support for AT27C512R-55RC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Atmel Corporation (now part of Microchip Technology) is a semiconductor innovator specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27C512R product line was designed to deliver high-reliability, low-power OTP EPROM solutions for firmware and configuration storage in resource-constrained embedded systems requiring long-term data retention and immunity to radiation-induced bit flips.
FAQ
What is the maximum operating temperature range for the AT27C512R-55RC?
The AT27C512R-55RC is rated for commercial temperature operation from 0°C to +70°C. This range is validated for timing, retention, and programming yield. For extended-range applications, Atmel offers industrial (-40°C to +85°C) and automotive (-40°C to +125°C) variants under different ordering codes (e.g., AT27C512R-55RI, AT27C512R-55RA), but the RC suffix specifically denotes the commercial-grade SOIC package.
Can the AT27C512R-55RC be programmed in-system?
No, the AT27C512R-55RC cannot be programmed in-system. Programming requires OE/VPP to be driven to 13.0 V ±0.25 V and VCC raised to 6.5 V ±0.25 V-conditions incompatible with standard 5 V system rails. It must be programmed using an external EPROM programmer that supports the Rapid™ algorithm and high-voltage sequencing. Once programmed, it functions as a standard 5 V read-only device.
Does the AT27C512R-55RC support byte-level erasure or reprogramming?
No, the AT27C512R-55RC is a one-time programmable (OTP) EPROM. Each memory cell uses a polysilicon fuse structure that permanently opens upon programming. There is no erase mechanism-neither UV light nor electrical-so data written to the AT27C512R-55RC is immutable after initial programming.
How does the Integrated Product Identification Code work on the AT27C512R-55RC?
The AT27C512R-55RC embeds two identification bytes: Manufacturer ID (0x1E) and Device ID (0x0D). To read them, A9 must be driven to 12.0 V ±0.5 V while all other address lines (A1–A15) are held low; A0 is then toggled between low and high to select which byte appears on O0–O7. This feature enables automatic device detection in programming equipment.
What decoupling capacitance is required for stable operation of the AT27C512R-55RC?
Per Atmel's system considerations, each AT27C512R-55RC requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For boards with multiple AT27C512R-55RC devices, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point to suppress supply rail droop during simultaneous output transitions.
AT27C512R-55RC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-SOIC (0.342", 8.69mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 512Kbit
- Memory Organization:
- 64K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT27C512R-55RC FAQ
1.How can I place an order for AT27C512R-55RC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-55RC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT27C512R-55RC reliable?
The price and inventory of AT27C512R-55RC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-55RC is usually 5 days.
3.What payment methods are accepted for AT27C512R-55RC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-55RC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-55RC?
AT27C512R-55RC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-55RC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT27C512R-55RC?
For technical support, including AT27C512R-55RC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-55RC requirements.
6.How does Aetrix verify that AT27C512R-55RC is sourced from the original manufacturer or authorized distributors?
All AT27C512R-55RC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT27C512R-55RC meets industry standards.
7.What is the process for return or replacement of AT27C512R-55RC?
All AT27C512R-55RC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-55RC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT27C512R-55RC part is unused and in its original packaging.
Return procedure for AT27C512R-55RC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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