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Microchip Technology AT27C512R-55PI
- Part No.:
- AT27C512R-55PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C512R-55PI.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,063
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Product details
Overview
AT27C512R-55PI from Microchip Technology (formerly Atmel) is a 512 Kbit (64K × 8) one-time programmable EPROM designed for nonvolatile firmware storage in embedded microprocessor systems. It delivers 55 ns read access time, operates from a single 5V ±10% supply, and supports industrial temperature range (–40°C to +85°C) in a 28-lead PDIP package. Used for boot code and configuration data in legacy industrial controllers and instrumentation.
For engineers reviewing the AT27C512R-55PI datasheet, AT27C512R-55PI pinout, AT27C512R-55PI application, or AT27C512R-55PI equivalent, key selection criteria include verified 55 ns tACC timing, CMOS/TTL-compatible I/O levels, rapid 100 µs/byte programming, JEDEC-standard PDIP mechanical compatibility, and integrated product identification code for automated programming validation.
Technical Context
The AT27C512R-55PI implements a two-line control architecture using CE (Chip Enable) and OE/VPP (Output Enable / Programming Voltage), enabling bus contention avoidance in shared-memory systems. Its address space spans A0–A15 (16-bit), with bidirectional O0–O7 data outputs and VCC/GND power terminals.
It supports dual-mode operation: standard 5V read mode and 13.0V VPP-assisted programming mode. The Rapid™ Programming Algorithm uses 100 µs CE pulses with verification loops per byte, and the Integrated Product Identification Code (Manufacturer ID = 0x1E, Device ID = 0x0D) enables algorithm auto-selection in compatible programmers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8); sufficient for full boot ROM or firmware image in 8-bit/16-bit MCU systems |
| Read Access Time (tACC) | 55 ns max; eliminates WAIT states on 12–18 MHz Z80, 8086, or 68000-based designs |
| Supply Voltage | 5V ±10%; compatible with standard TTL/CMOS logic rails without regulation overhead |
| Active Current (ICC) | 20 mA max at 5 MHz; enables low-power operation in battery-backed or energy-constrained systems |
| Standby Current (ISB) | 100 µA max (CMOS CE); reduces quiescent draw during processor sleep or idle cycles |
| Programming Voltage (VPP) | 13.0 V ±0.25 V on OE/VPP pin; requires dedicated high-voltage programming circuitry or certified EPROM programmer |
| ESD Protection | 2,000 V HBM; enhances robustness during handling and board-level assembly |
| Operating Temperature | –40°C to +85°C; qualified for industrial-grade embedded applications including PLCs and motor drives |
Pinout & Package
AT27C512R-55PI is packaged in a 28-lead, 0.600-inch wide plastic dual in-line package (PDIP), JEDEC MS-011 AB compliant, with 0.3 inch row spacing and through-hole mounting.
| 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 bus; outputs valid data when CE=OE=low; high-impedance when disabled |
| CE | Chip Enable | Primary device select; must be low for read or program; controls standby current state |
| OE/VPP | Output Enable / Programming Voltage | Low during read; driven to 13.0 V for programming; also used for product ID readback |
| VCC | Power Supply | +5V ±10% main supply; must be applied simultaneously with or before OE/VPP |
| GND | Ground | Reference return path; requires local 0.1 µF ceramic decoupling per device |
| NC | No Connect | Pins not assigned; left unconnected per datasheet; no internal connection or function |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify-reprogram loop, reducing production burn-in cycle time |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device ID (0x0D) readable via A9/A0 toggling; enables programmer auto-detection and algorithm matching |
| Two-Line Control Architecture | Independent CE and OE/VPP pins allow flexible memory mapping and prevent bus conflicts in multi-device systems |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2,000 V ESD protection ensure field reliability in noisy industrial environments |
| JEDEC-Standard Packaging | Available in PDIP, PLCC, SOIC, and TSOP; AT27C512R-55PI uses industry-standard 28P6 PDIP footprint for drop-in replacement |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic firmware and I/O configuration tables in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 55 ns read access to initialization code upon power-up or reset. Use Value: Eliminates reliance on external mass storage; ensures immediate, jitter-free execution without WAIT states on 12 MHz 80C188-based control CPUs. |
Use Scenario: Hosting startup code and hardware initialization routines for 8-bit and 16-bit microcontrollers in medical diagnostic equipment. IC Role / Device Role / Timing Role: OTP EPROM acting as primary code memory mapped into the lower 64K address space of Z80 or 68000 derivatives. Use Value: Guarantees firmware integrity across power cycles; supports CMOS/TTL I/O compatibility with legacy bus interfaces without level-shifting. |
| Automated Test Equipment (ATE) Calibration Data | Avionics System Configuration Memory |
Use Scenario: Storing calibrated sensor offset/gain coefficients and test sequence parameters in benchtop ATE platforms requiring long-term data retention. IC Role / Device Role / Timing Role: Read-only configuration store accessed during self-test initialization; programmed once during final calibration. Use Value: Provides tamper-resistant, nonvolatile storage immune to accidental overwrite; 100 µs/byte programming enables efficient post-calibration data loading. |
Use Scenario: Holding flight-critical configuration maps and hardware revision identifiers in legacy avionics subsystems where reprogrammability is prohibited. IC Role / Device Role / Timing Role: Certified OTP memory used for immutable system identity and operational parameter tables in DO-254-compliant designs. Use Value: Meets industrial temperature range (–40°C to +85°C) and ESD/latchup specs required for airborne electronics; product ID code supports traceable firmware versioning. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512R-55PC | Same die, identical electrical specs, but in commercial temperature grade (0°C to +70°C) and same 28P6 PDIP package | Not rated for industrial ambient conditions; unsuitable for extended-temperature deployments | Select only for cost-sensitive, room-temperature lab or consumer-grade systems |
| AM27C512-55DC | AMD-manufactured 512K OTP EPROM; 55 ns access, 5V supply, but lacks Integrated Product ID Code and Rapid™ programming support | Requires manual algorithm selection in programmers; no electronic device identification capability | Choose only if legacy AMD toolchain compatibility is mandatory and ID code functionality is unused |
Compared with AT27C512R-55PC, the AT27C512R-55PI offers guaranteed operation across –40°C to +85°C, critical for industrial control cabinets. Against AM27C512-55DC, it provides faster, more reliable programming and automated programmer recognition-reducing firmware burn-in errors and setup time.
Availability
AT27C512R-55PI is available at Aetrix Electronics and suitable for industrial PLCs, legacy microcontroller boot systems, and automated test equipment requiring stable component supply, long-lifecycle support, and verified OTP EPROM performance.
Supply support for AT27C512R-55PI 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
Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel memory products. The company specializes in microcontrollers, analog, and nonvolatile memory solutions for industrial, automotive, and aerospace markets.
The AT27C512R-55PI belongs to Atmel's 27C-series OTP EPROM family, engineered for high-reliability, low-power firmware storage in systems where code immutability, fast read access, and industrial temperature resilience are essential design requirements.
FAQ
What is the maximum operating frequency supported by AT27C512R-55PI?
The AT27C512R-55PI does not operate at a clock frequency itself-it is an asynchronous memory device. Its 55 ns access time supports reliable interfacing with microprocessors running up to approximately 12–15 MHz (e.g., Z80, 8086, 68000) without WAIT states. Timing is governed by tACC, tCE, and tOE parameters, not a system clock input.
Can AT27C512R-55PI be reprogrammed after initial programming?
No, AT27C512R-55PI is a one-time programmable (OTP) EPROM. Once programmed, its contents cannot be erased or rewritten. It lacks UV-erasable quartz window or electrically erasable (EEPROM/Flash) circuitry. Programming is permanent and irreversible-intended for final firmware images or calibration data.
What voltage is required on the OE/VPP pin during programming of AT27C512R-55PI?
During programming, the OE/VPP pin of AT27C512R-55PI must be driven to 13.0 V ±0.25 V while CE is pulsed. This high voltage enables the internal floating-gate injection mechanism. Applying 13 V to OE/VPP is mandatory-standard 5 V logic levels will not initiate programming. VCC must also be raised to 6.5 V ±0.25 V during this phase.
Does AT27C512R-55PI support automatic device identification in programming equipment?
Yes, AT27C512R-55PI includes an Integrated Product Identification Code. By holding A9 at 12.0 V and toggling A0, programmers can read Manufacturer ID (0x1E) and Device ID (0x0D). This allows certified programmers like BP Microsystems or Xeltek units to auto-select correct algorithms, voltages, and timing-reducing manual setup errors for AT27C512R-55PI.
Is decoupling capacitance required for stable operation of AT27C512R-55PI?
Yes, the AT27C512R-55PI requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For systems with multiple EPROMs, a bulk 4.7 µF electrolytic capacitor should also be added near the power entry point. These capacitors suppress transient noise during CE transitions and ensure voltage stability within datasheet limits.
AT27C512R-55PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-PDIP
AT27C512R-55PI FAQ
1.How can I place an order for AT27C512R-55PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-55PI 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-55PI reliable?
The price and inventory of AT27C512R-55PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-55PI is usually 5 days.
3.What payment methods are accepted for AT27C512R-55PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-55PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-55PI?
AT27C512R-55PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-55PI 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-55PI?
For technical support, including AT27C512R-55PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-55PI requirements.
6.How does Aetrix verify that AT27C512R-55PI is sourced from the original manufacturer or authorized distributors?
All AT27C512R-55PI 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-55PI meets industry standards.
7.What is the process for return or replacement of AT27C512R-55PI?
All AT27C512R-55PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-55PI, 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-55PI part is unused and in its original packaging.
Return procedure for AT27C512R-55PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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