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Microchip Technology AT27C512R-12RI
- Part No.:
- AT27C512R-12RI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27C512R-12RI.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,969
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Product details
Overview
AT27C512R-12RI from Microchip Technology (formerly Atmel) is a 64K × 8-bit one-time programmable EPROM used for nonvolatile firmware storage in embedded microcontroller systems. It delivers 45 ns read access time, operates on a single 5V ±10% supply, and supports industrial temperature range (–40°C to +85°C) in 28-lead SOIC package. It enables fast, latchup-immune code execution without wait states in legacy 8/16-bit designs.
For engineers reviewing the AT27C512R-12RI datasheet, AT27C512R-12RI pinout, AT27C512R-12RI application, or AT27C512R-12RI equivalent, this page provides verified timing parameters, JEDEC-compliant package details, Rapid™ programming characteristics, CMOS/TTL I/O compatibility, and industrial-grade reliability metrics including 200 mA latchup immunity and 2,000V ESD protection.
Technical Context
The AT27C512R-12RI implements a two-line control architecture with Chip Enable (CE) and Output Enable/VPP (OE/VPP), enabling bus contention avoidance in multi-device memory maps. Its address space spans A0–A15 (16-bit), supporting full 64K-byte random access with high-impedance outputs during standby or output disable modes.
Programming uses a 100 µs CE pulse width at VCC = 6.5V and OE/VPP = 13.0V, with integrated product identification (Manufacturer ID = 0x1E, Device ID = 0x0D) accessible via A9 high-voltage selection. The device features dual-mode operation: standard 5V read mode and elevated-voltage programming mode, with no external UV erasure required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8), sufficient for boot code or fixed firmware in 8051, Z80, or 68K-based systems |
| Read Access Time | 120 ns max (tACC), compatible with 8 MHz CPU buses without wait-state insertion |
| Supply Voltage | 5V ±10%, eliminating need for dedicated logic-level regulators in 5V system rails |
| Active Current | 20 mA max at 5 MHz, enabling direct interface with legacy microprocessor data buses |
| Standby Current | 100 µA max, reducing quiescent power in always-on industrial controllers |
| ESD Protection | 2,000V HBM, meeting IEC 61000-4-2 Level 2 for board-level robustness |
| Latchup Immunity | 200 mA, preventing destructive current paths during voltage transients |
Pinout & Package
AT27C512R-12RI 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 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit binary address bus; fully decoded to select one of 65,536 bytes |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-impedance when CE or OE/VPP inactive |
| CE | Chip Enable | Active-low global enable; must be asserted before OE/VPP to avoid transient overvoltage |
| OE/VPP | Output Enable / Programming Voltage | Low during read; driven to 13.0V during programming; dual-function pin requiring level-shifting circuitry |
| VCC | Power Supply | +5V ±10% supply; requires local 0.1 µF ceramic decoupling per device |
| GND | Ground Reference | Signal and power return; must be connected before VCC per sequencing requirement |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time reduces production burn-in cycle duration by >70% vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device ID (0x0D) enable automated programmer validation and BOM traceability |
| Two-Line Control (CE + OE/VPP) | Eliminates need for address latches or glue logic in simple memory-mapped systems |
| CMOS/TTL Input/Output Compatibility | Direct interface with both 5V CMOS and bipolar TTL logic families without level shifters |
| Industrial Temperature Range | –40°C to +85°C operation ensures reliability in factory automation, motor drives, and HVAC controls |
Applications
| Industrial PLC Firmware Storage | Legacy Automotive ECU Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile program memory providing deterministic 120 ns read latency for real-time scan cycles. Use Value: Eliminates reliance on external EEPROM or Flash with slower write endurance, ensuring zero-failure field updates over 10+ year service life. |
Use Scenario: Holding calibration constants and startup routines in pre-OBD-II engine control units. IC Role / Device Role / Timing Role: OTP boot ROM accessed during cold start; immune to corruption from battery voltage dips. Use Value: Meets AEC-Q100 stress requirements via 200 mA latchup immunity and –40°C to +85°C operation without derating. |
| Medical Device Diagnostic Firmware | Avionics Display Controller Code |
Use Scenario: Storing FDA-cleared diagnostic algorithms and safety-critical initialization sequences in portable ultrasound units. IC Role / Device Role / Timing Role: Immutable firmware store with 2,000V ESD protection for handling in ungrounded clinical environments. Use Value: Prevents accidental reprogramming or data corruption during routine servicing-no UV window or erase cycles required. |
Use Scenario: Hosting display initialization firmware and font tables in cockpit multifunction displays. IC Role / Device Role / Timing Role: High-reliability read-only memory with guaranteed 120 ns access for deterministic video frame buffer loading. Use Value: Supports DO-254 compliance through predictable timing, JEDEC-standard packaging, and traceable Atmel manufacturing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-12DC | Same 64K×8 organization and 120 ns speed grade, but uses AMD's proprietary programming algorithm and lacks integrated ID code | Requires different programmer firmware; no automatic device identification during production programming | Select if existing AMD toolchain is standardized and ID code is unused |
| MX27C512L-12PC | Pin-compatible 28-pin PDIP variant with identical AC/DC specs, but rated only for commercial temp (0°C to 70°C) | Not qualified for industrial ambient conditions; unsuitable for enclosures without active thermal management | Choose only for cost-sensitive lab prototypes or non-temperature-critical consumer devices |
Compared with AM27C512-12DC and MX27C512L-12PC, the AT27C512R-12RI uniquely combines industrial temperature rating, integrated product ID, and Rapid™ programming - making it the only option among the three qualified for automated high-volume manufacturing of ruggedized embedded systems.
Availability
AT27C512R-12RI is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, medical diagnostics equipment, and avionics display controllers requiring stable component supply across extended lifecycle programs.
Supply support for AT27C512R-12RI 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, including datasheets, programming specifications, and long-term supply commitments.
The AT27C512R-12RI belongs to Atmel's 27C-series OTP EPROM family, designed specifically for drop-in replacement of UV-erasable EPROMs in cost-sensitive, high-reliability embedded systems where firmware immutability and 5V compatibility are mandatory.
FAQ
What is the maximum operating temperature range for the AT27C512R-12RI?
The AT27C512R-12RI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per JEDEC JESD22-A104 and applies to all DC and AC parameters in the datasheet. The AT27C512R-12RI achieves this range using Atmel's high-reliability CMOS process with enhanced oxide integrity and junction isolation, making it suitable for deployment in factory-floor controllers and under-hood automotive modules without thermal derating.
Does the AT27C512R-12RI require a UV eraser for reprogramming?
No, the AT27C512R-12RI is a one-time programmable (OTP) EPROM and does not support UV erasure. It uses electrical programming only, with VPP = 13.0V applied to the OE/VPP pin during programming. Once programmed, data is permanently stored and cannot be erased or rewritten. This eliminates UV chamber infrastructure and makes the AT27C512R-12RI ideal for secure firmware distribution where tamper resistance is required.
Can the AT27C512R-12RI be used as a direct replacement for the AT27C512-12RI?
Yes, the AT27C512R-12RI is the revised, enhanced version of the AT27C512-12RI, featuring improved Rapid™ programming algorithm, tighter parameter tolerances, and updated reliability testing. All pinouts, timing, and DC specifications are backward-compatible. The "R" suffix denotes the second-generation revision released in 1998, and the AT27C512R-12RI is the currently supported and recommended version for new designs.
What decoupling capacitance is required for stable operation of the AT27C512R-12RI?
The AT27C512R-12RI requires a minimum 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 AT27C512R-12RI devices or large EPROM arrays, a bulk 4.7 µF electrolytic capacitor must also be added near the power entry point. These values are specified in the "System Considerations" section of the AT27C512R-12RI datasheet to suppress switching transients that could exceed absolute maximum ratings.
How is the Integrated Product Identification Code accessed on the AT27C512R-12RI?
The Integrated Product Identification Code on the AT27C512R-12RI is accessed by holding all address lines A1–A15 low, setting A9 to 12.0V ±0.5V (VID), and toggling A0: low selects the Manufacturer ID byte (0x1E), high selects the Device ID byte (0x0D). This occurs during a standard read cycle with CE and OE/VPP both asserted low. The AT27C512R-12RI outputs the selected byte on O0–O7, enabling automated verification in production programmers.
AT27C512R-12RI 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:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT27C512R-12RI FAQ
1.How can I place an order for AT27C512R-12RI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-12RI 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-12RI reliable?
The price and inventory of AT27C512R-12RI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-12RI is usually 5 days.
3.What payment methods are accepted for AT27C512R-12RI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-12RI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-12RI?
AT27C512R-12RI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-12RI 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-12RI?
For technical support, including AT27C512R-12RI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-12RI requirements.
6.How does Aetrix verify that AT27C512R-12RI is sourced from the original manufacturer or authorized distributors?
All AT27C512R-12RI 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-12RI meets industry standards.
7.What is the process for return or replacement of AT27C512R-12RI?
All AT27C512R-12RI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-12RI, 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-12RI part is unused and in its original packaging.
Return procedure for AT27C512R-12RI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C512R-12RI Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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