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Microchip Technology AT27C512R-12JI
- Part No.:
- AT27C512R-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-12JI.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,989
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Product details
Overview
AT27C512R-12JI 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 45 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 SOIC package. Used in boot code storage for legacy controllers where reprogrammability is unnecessary but reliability and timing predictability are critical.
For engineers reviewing the AT27C512R-12JI datasheet, AT27C512R-12JI pinout, AT27C512R-12JI application, or AT27C512R-12JI equivalent, key selection considerations include verified 45 ns tACC performance at industrial temperature, CMOS/TTL-compatible I/O levels, Rapid™ programming algorithm (100 µs/byte), integrated product identification code, and JEDEC-standard SOIC packaging with two-line control (CE/OE).
Technical Context
The AT27C512R-12JI implements a parallel-addressed OTP EPROM architecture with full 16-bit address bus (A0–A15) and 8-bit bidirectional data bus (O0–O7). Its dual-control interface uses CE (Chip Enable) and OE/VPP (Output Enable / Programming Voltage) pins to manage bus contention and mode selection-read, standby, rapid program, or product ID read.
It employs scaled CMOS process technology enabling 100 µA max standby current and 20 mA max active current at 5 MHz, with 2,000V ESD protection and 200 mA latchup immunity. The device requires VPP = 12.0 V ±0.5 V during programming and supports manufacturer/device ID readout via A9 high-voltage (11.5–12.5 V) and A0 toggling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8); sufficient for boot ROM or fixed firmware in 8-bit/16-bit microcontroller systems. |
| Read Access Time (tACC) | 45 ns max; enables direct connection to high-speed CPUs without wait-state insertion. |
| Supply Voltage | 5 V ±10%; compatible with standard TTL/CMOS logic rails and eliminates need for auxiliary voltage regulators. |
| Operating Temperature | –40°C to +85°C; qualified for industrial-grade embedded applications including motor controls and instrumentation. |
| Standby Current | 100 µA max; minimizes power draw in low-power sleep modes of host systems. |
| Programming Speed | 100 µs/byte typical (Rapid™ Algorithm); reduces production programming cycle time versus conventional EPROMs. |
| ESD Protection | 2,000 V HBM; enhances robustness during handling and PCB assembly in manufacturing environments. |
Pinout & Package
AT27C512R-12JI is supplied in a 28-lead, 0.330" wide plastic gull-wing small outline integrated circuit (SOIC) package 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; selects one of 65,536 memory locations for read or program operations. |
| O0–O7 | Data Outputs | 8-bit tristate data bus; driven only when CE = VIL and OE/VPP = VIL; high-impedance otherwise. |
| CE | Chip Enable | Primary chip-select input; disables outputs and reduces current to standby level when high. |
| OE/VPP | Output Enable / Programming Voltage | In read mode: output enable control; in program mode: 12 V programming supply input (VPP). |
| VCC | Power Supply | +5 V ±10% main supply; must be applied simultaneously with or before OE/VPP during programming. |
| GND | Ground | Reference return path for all signals and power; requires local 0.1 µF ceramic decoupling per device. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify-reprogram loop; improves production throughput and yield. |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0D) readable via A9 = 12 V and A0 toggle; enables automated programmer validation. |
| Two-Line Control Interface | Separate CE and OE/VPP pins allow independent bus arbitration and eliminate contention during multi-device memory mapping. |
| CMOS/TTL-Compatible I/O | VIL ≤ 0.8 V, VIH ≥ 2.0 V, VOL ≤ 0.4 V, VOH ≥ 2.4 V; ensures interoperability with both logic families without level-shifting. |
| High-Reliability Process | 2,000 V HBM ESD rating and 200 mA latchup immunity; meets industrial handling and system-level surge requirements. |
Applications
| Industrial PLC Firmware Storage | Legacy Automotive Engine Control Modules |
|---|---|
Use Scenario: Storing immutable boot code and calibration tables in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Nonvolatile parallel memory providing deterministic 45 ns read latency to 8051- or Z80-based CPU subsystems during cold start and watchdog recovery. Use Value: Eliminates reliance on slower serial EEPROM or external flash, ensuring sub-microsecond instruction fetch timing critical for real-time I/O scanning cycles. |
Use Scenario: Holding engine map data and initialization routines in pre-OBD-II automotive ECUs operating in under-hood environments. IC Role / Device Role / Timing Role: OTP EPROM serving as primary firmware repository with guaranteed data retention >20 years at 85°C ambient. Use Value: Industrial temperature qualification (–40°C to +85°C) and 2,000 V ESD protection ensure functional integrity across thermal cycling and service bay ESD events. |
| Medical Diagnostic Equipment Boot ROM | Avionics Subsystem Configuration Memory |
Use Scenario: Storing BIOS-equivalent startup firmware in portable ultrasound or patient monitor mainboards requiring regulatory-certified component stability. IC Role / Device Role / Timing Role: Fixed-function memory mapped into CPU address space at reset vector; accessed synchronously without clock domain crossing. Use Value: One-time programmability prevents field corruption; 100 µA standby current extends battery-backed operation during maintenance shutdowns. |
Use Scenario: Holding hardware configuration bitstreams and safety-critical initialization parameters in flight control computer peripheral modules. IC Role / Device Role / Timing Role: Read-only memory used during power-on self-test (POST) to validate FPGA configuration and sensor interface settings. Use Value: JEDEC-standard SOIC package enables conformal coating compatibility; Rapid™ programming supports traceable lot-level firmware versioning in DO-254 workflows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-45DC | 45 ns access, 28-pin PDIP only; no SOIC option; 1 mA TTL-mode standby current vs. 100 µA CMOS standby. | Limited to through-hole assembly; higher standby draw unsuitable for battery-buffered systems. | Select if legacy board layout mandates PDIP footprint and power budget allows 10× higher standby current. |
| MX27C512PC-12 | 120 ns access time; same 64K×8 OTP structure; 28-pin SOIC; 200 µA standby; no integrated ID code. | Slower timing restricts use to ≤8 MHz CPU buses; lacks A9-based ID read capability for automated programming verification. | Choose only when 120 ns latency is acceptable and programming equipment does not require electronic device identification. |
Compared with AM27C512-45DC and MX27C512PC-12, the AT27C512R-12JI uniquely combines 45 ns speed, industrial temperature SOIC packaging, ultra-low 100 µA standby, and integrated ID code-enabling compact, low-power, and production-automated firmware storage where timing determinism and long-term data integrity are mandatory.
Availability
AT27C512R-12JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy automotive ECU boot code, medical diagnostic boot ROM, avionics configuration memory, and embedded controller initialization requiring stable component supply over extended production lifecycles.
Supply support for AT27C512R-12JI 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 its legacy OTP EPROM portfolio for industrial and aerospace legacy system support.
The AT27C512R product line was engineered for cost-sensitive, high-reliability embedded systems requiring guaranteed nonvolatile storage without field reprogrammability-targeting applications where firmware immutability and timing predictability outweigh flash flexibility.
FAQ
What is the maximum allowed VPP voltage for programming the AT27C512R-12JI?
The AT27C512R-12JI requires OE/VPP = 12.0 V ±0.5 V during programming, with absolute maximum rating of +14.0 V on A9 and VPP pins. Exceeding 12.5 V risks oxide damage or inconsistent programming; verified operation occurs only within 11.5–12.5 V per DC programming characteristics table. Always apply VCC before VPP and remove VCC after VPP to prevent latchup.
Does the AT27C512R-12JI support in-system programming?
No, the AT27C512R-12JI does not support in-system programming. It requires removal from the target PCB and insertion into a dedicated EPROM programmer capable of delivering 12 V to OE/VPP and applying precise 100 µs CE pulses. Its SOIC package is not designed for socketed hot-plug programming, and system-level VPP routing introduces noise and timing risks incompatible with Rapid™ algorithm timing windows.
Can the AT27C512R-12JI be used as a drop-in replacement for the AT27C512-12JC?
No, the AT27C512R-12JI is not a drop-in replacement for AT27C512-12JC. While both share 45 ns speed and 64K×8 organization, the "R" suffix denotes revised process (lower power, Rapid™ programming, integrated ID code), and the "JI" suffix specifies industrial-temperature SOIC packaging-whereas "JC" indicates commercial-temperature PDIP. Pinout matches, but thermal and power behavior differ significantly.
What decoupling capacitance is required for stable AT27C512R-12JI operation?
The AT27C512R-12JI requires a minimum 0.1 µF ceramic capacitor between VCC and GND, placed as close as possible to the device pins. For systems with multiple EPROMs or high-noise switching supplies, add a 4.7 µF bulk electrolytic capacitor near the array's power entry point. These values are specified in the System Considerations section to suppress transient excursions during CE transitions that could violate absolute maximum ratings.
How is the manufacturer and device identification code read from the AT27C512R-12JI?
The AT27C512R-12JI identification code is read by setting A9 to 11.5–12.5 V (VID), holding A1–A15 low, and toggling A0: low reads Manufacturer ID (0x1E), high reads Device Code (0x0D). This occurs during a standard read cycle with CE = VIL and OE/VPP = VIL. The feature is electrically verified and used by industry-standard programmers like Data I/O PS-3000 to auto-select algorithms.
AT27C512R-12JI 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:
- 120 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-12JI FAQ
1.How can I place an order for AT27C512R-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-12JI 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-12JI reliable?
The price and inventory of AT27C512R-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-12JI is usually 5 days.
3.What payment methods are accepted for AT27C512R-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-12JI?
AT27C512R-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-12JI 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-12JI?
For technical support, including AT27C512R-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-12JI requirements.
6.How does Aetrix verify that AT27C512R-12JI is sourced from the original manufacturer or authorized distributors?
All AT27C512R-12JI 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-12JI meets industry standards.
7.What is the process for return or replacement of AT27C512R-12JI?
All AT27C512R-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-12JI, 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-12JI part is unused and in its original packaging.
Return procedure for AT27C512R-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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