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Microchip Technology AT27C512R-90JI
- Part No.:
- AT27C512R-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-90JI.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,761
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Product details
Overview
AT27C512R-90JI 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 operates from a single 5V ±10% supply, delivers 45 ns read access time, supports industrial temperature range (–40°C to +85°C), and uses CMOS/TTL-compatible I/O for seamless integration with legacy controllers.
For engineers reviewing the AT27C512R-90JI datasheet, AT27C512R-90JI pinout, AT27C512R-90JI application, or AT27C512R-90JI equivalent, this page provides verified package mapping (28-lead SOIC), JEDEC-standard two-line control interface (CE/OE), Rapid™ programming timing (100 µs/byte), ESD/latchup robustness (2000V/200 mA), and industrial-grade reliability data - all critical for legacy system maintenance and replacement design-in.
Technical Context
The AT27C512R-90JI implements a parallel-addressed OTP EPROM architecture with dual active-low control lines (CE and OE/VPP) enabling bus contention avoidance in multi-device systems. Its address space spans A0–A15 (16-bit), outputs O0–O7 (8-bit bidirectional data bus), and includes dedicated VPP programming voltage input on the OE pin during write cycles.
It employs scaled CMOS process technology to achieve low active current (20 mA max at 5 MHz) and ultra-low standby current (100 µA max), while maintaining compatibility with TTL logic thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and supporting rapid byte-level programming via 13.0 V ±0.25 V VPP pulses with 100 µs CE pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8) - supports full 64KB firmware image storage without bank switching |
| Read Access Time | 90 ns max - ensures no WAIT states required for 11 MHz CPU bus timing |
| VCC Supply | 5V ±10% - compatible with standard logic rails; no auxiliary voltage needed for read mode |
| Standby Current | 100 µA max - enables low-power hold state in battery-backed or energy-sensitive systems |
| Programming Voltage | VPP = 13.0 V ±0.25 V on OE pin - requires external high-voltage programmer; not internally generated |
| ESD Protection | 2000 V HBM - meets industrial handling requirements without additional protection circuitry |
| Latchup Immunity | 200 mA - withstands transient overcurrent events per JEDEC JESD78 |
Pinout & Package
AT27C512R-90JI is packaged in a 28-lead SOIC (package code "R", 0.330" wide), per JEDEC MS-012 standard. Pin pitch is 1.27 mm; body width is 7.5 mm; total length is 17.9 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit unidirectional address bus; latched on CE/OE transition for memory location selection |
| O0–O7 | Data Outputs | 8-bit tristate output bus; driven only when CE = VIL and OE = VIL; high-impedance otherwise |
| CE | Chip Enable | Primary device select; must be low to enable read or program mode; controls internal power gating |
| OE/VPP | Output Enable / Programming Voltage | In read mode: active-low output enable; in program mode: accepts 13 V for byte programming |
| VCC | Power Supply | +5 V ±10% main supply; powers core logic and I/O buffers; must be stable before OE/VPP activation |
| GND | Ground Reference | Signal and power return path; requires local 0.1 µF ceramic decoupling per device |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time - reduces production burn-in cycle duration by >5× vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device Code (0x0D) readable via A9/A0 toggle - enables automated programmer validation and BOM traceability |
| Two-Line Control Interface | Separate CE and OE/VPP pins - eliminates bus contention in shared-data-bus architectures without external logic |
| Industrial Temperature Range | –40°C to +85°C operation - qualified for deployment in factory automation, motor drives, and telecom line cards |
| CMOS/TTL I/O Compatibility | VIH = 2.0 V min, VOL = 0.4 V max - interoperates directly with both 5V CMOS and bipolar TTL microcontrollers |
Applications
| Industrial PLC Firmware Storage | Legacy Medical Device Boot ROM |
|---|---|
Use Scenario: Storing fixed boot code and safety-critical control logic in programmable logic controllers deployed in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot ROM providing deterministic 90 ns read access to initialization routines for 8/16-bit MCUs. Use Value: Eliminates reliance on slow serial EEPROM or unreliable battery-backed SRAM; supports long-term data retention (>10 years) without refresh. | Use Scenario: Holding certified diagnostic firmware in Class II medical instruments where reprogramming is prohibited after regulatory approval. IC Role / Device Role / Timing Role: One-time programmable firmware repository ensuring immutable code execution at power-on reset. Use Value: Meets IEC 62304 software lifecycle requirements for locked-down, tamper-resistant storage of validated binaries. |
| Automotive Engine Control Module (ECM) | Avionics Maintenance Data Log |
Use Scenario: Storing calibration maps and fail-safe routines in engine control units operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: OTP EPROM used as primary map ROM; accessed via 8-bit parallel bus synchronized to MCU clock. Use Value: Industrial-grade thermal specification and 2000 V ESD rating ensure reliability in electrically noisy under-hood environments. | Use Scenario: Recording flight-hour counters and maintenance event timestamps in airborne avionics test equipment. IC Role / Device Role / Timing Role: Nonvolatile storage for mission-critical log data; written once during ground maintenance, read during pre-flight checks. Use Value: Immunity to radiation-induced bit flips (no charge-pump cells) and latchup immunity (200 mA) meet DO-160 Section 22 surge requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-90JI | No integrated product ID code; lacks Rapid™ programming algorithm; 100 µs/byte programming not guaranteed | Suitable only for cost-sensitive legacy designs where ID verification and fast programming are unnecessary | Select AT27C512R-90JI when automated programming validation or reduced production cycle time is required |
| MX27C512-90PC | Same 64K×8 organization and 90 ns speed grade but uses PDIP package (28P6); no SOIC variant available | Requires PCB redesign for through-hole mounting; incompatible with surface-mount assembly lines | Choose AT27C512R-90JI for SMT-compatible industrial designs requiring SOIC footprint and JEDEC-compliant pinout |
Compared with AT27C512-90JI and MX27C512-90PC, the AT27C512R-90JI uniquely combines SOIC packaging, integrated ID code, and guaranteed Rapid™ programming - making it the only option supporting automated, traceable, and SMT-optimized OTP firmware deployment in new industrial builds.
Availability
AT27C512R-90JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy medical device boot ROM, and automotive engine control module applications requiring stable component supply, long-lifecycle support, and guaranteed SOIC packaging.
Supply support for AT27C512R-90JI 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 technical and manufacturing continuity for the AT27C512R family. The company specializes in secure, reliable, and long-lifecycle semiconductor solutions for industrial, automotive, and aerospace markets.
The AT27C512R belongs to Atmel's legacy OTP EPROM product line, engineered specifically for firmware storage in systems where code immutability, deterministic timing, and JEDEC-standard parallel interfaces are mandatory - especially in safety-critical and maintenance-constrained environments.
FAQ
What is the maximum read access time specified for the AT27C512R-90JI?
The AT27C512R-90JI has a maximum read access time of 90 ns under industrial temperature conditions (–40°C to +85°C) and 5V ±10% supply. This value is measured from address valid or CE/OE assertion to valid data on O0–O7 outputs, per AC Characteristics Table on page 4 of the datasheet. It guarantees compatibility with 11 MHz microprocessor buses without WAIT-state insertion.
Does the AT27C512R-90JI require a separate programming voltage supply?
Yes, the AT27C512R-90JI requires an external 13.0 V ±0.25 V programming voltage applied to the OE/VPP pin during byte programming. This voltage is not generated internally; it must be supplied by a compliant EPROM programmer. During normal read operation, OE/VPP functions as a standard TTL/CMOS-compatible output enable signal at 5V logic levels.
What package type is used for the AT27C512R-90JI?
The AT27C512R-90JI uses a 28-lead SOIC (Small Outline Integrated Circuit) package, designated "28R" in Atmel's ordering nomenclature. Its dimensions conform to JEDEC MS-012: 7.5 mm body width, 17.9 mm length, and 1.27 mm lead pitch. This surface-mount package supports automated PCB assembly and replaces through-hole PDIP variants in space-constrained designs.
Can the AT27C512R-90JI be reprogrammed multiple times?
No, the AT27C512R-90JI is a one-time programmable (OTP) EPROM. Once programmed, its memory cells cannot be erased or rewritten. Programming permanently alters fusible links within the silicon; no UV erasure window or electrical erase capability exists. It is intended for final firmware images that must remain immutable after production programming.
What is the purpose of the Integrated Product Identification Code in the AT27C512R-90JI?
The Integrated Product Identification Code in the AT27C512R-90JI provides two electronically readable bytes: Manufacturer ID (0x1E) and Device Code (0x0D). Accessed by holding A1–A15 low, setting A9 to 12.0 V, and toggling A0, it enables automated programmers to verify part authenticity and select correct programming algorithms - critical for high-yield, traceable manufacturing of AT27C512R-90JI-based systems.
AT27C512R-90JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- 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:
- 90 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27C512R-90JI FAQ
1.How can I place an order for AT27C512R-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-90JI 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-90JI reliable?
The price and inventory of AT27C512R-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-90JI is usually 5 days.
3.What payment methods are accepted for AT27C512R-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-90JI?
AT27C512R-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-90JI 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-90JI?
For technical support, including AT27C512R-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-90JI requirements.
6.How does Aetrix verify that AT27C512R-90JI is sourced from the original manufacturer or authorized distributors?
All AT27C512R-90JI 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-90JI meets industry standards.
7.What is the process for return or replacement of AT27C512R-90JI?
All AT27C512R-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-90JI, 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-90JI part is unused and in its original packaging.
Return procedure for AT27C512R-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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