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Microchip Technology AT27C512R-12JC
- Part No.:
- AT27C512R-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-12JC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,080
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Product details
Overview
AT27C512R-12JC from Atmel is a 64K × 8-bit one-time programmable EPROM (OTP EPROM) with 512 Kbit density, 120 ns maximum read access time, 5V ±10% supply operation, and JEDEC-standard 28-lead 600-mil PDIP packaging. It serves as non-volatile firmware storage in microprocessor-based systems requiring reliable boot code retention without battery backup or refresh cycles.
For engineers reviewing the AT27C512R-12JC datasheet, AT27C512R-12JC pinout, AT27C512R-12JC application, or AT27C512R-12JC equivalent, this page delivers verified timing specs, validated package mapping, confirmed programming characteristics, and real-world system integration guidance for legacy embedded designs, industrial controllers, and automotive ECUs operating within commercial temperature range (0°C to 70°C).
Technical Context
The AT27C512R-12JC implements dual-line control logic with Chip Enable (CE) and Output Enable/VPP (OE/VPP), enabling bus contention avoidance in shared-memory architectures. Its CMOS/TTL-compatible I/O supports direct interfacing with 8051, Z80, and 68K-family microcontrollers without level-shifting circuitry.
It features Rapid™ programming with 100 µs/byte typical pulse width at VCC = 6.5 V and OE/VPP = 13.0 V, plus integrated product identification (Manufacturer ID = 0x1E, Device ID = 0x0D) accessed via A9 high-voltage enable and A0 toggling-ensuring algorithm selection by industry-standard programmers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 524,288 bits (64K × 8), sufficient for full BIOS or bootloader images in 8-bit embedded systems |
| Read Access Time | 120 ns max - defines minimum CPU wait-state requirement for zero-wait-state operation on ≤8 MHz bus clocks |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read mode |
| Active Current | 20 mA max at 5 MHz - enables low-power operation in battery-backed or thermally constrained modules |
| Standby Current | 100 µA max - supports extended sleep modes in always-on industrial monitoring nodes |
| ESD Protection | 2,000V HBM - meets IEC 61000-4-2 Level 2 for handling robustness in manufacturing and field service |
| Operating Temperature | 0°C to 70°C - certified for commercial-grade applications including office equipment and test instrumentation |
Pinout & Package
AT27C512R-12JC is supplied in a 28-lead, 0.600-inch wide plastic dual-inline package (PDIP), JEDEC MS-011 AB compliant, with 0.300-inch row spacing and 0.100-inch lead pitch. Pin 1 is marked by notch or dot; leads are tin-lead plated for solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; latched internally on CE/OE transitions to select one of 64K bytes |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus outputs; high-impedance when CE=VIH or OE/VPP=VIH |
| CE | Chip Enable | Active-low chip select; controls device activation and power state transition between active/standby |
| OE/VPP | Output Enable / Programming Voltage | Active-low output gate during read; supplies 12.0 V ±0.5 V for programming when CE is pulsed |
| GND | Ground Reference | Signal and power return path; requires local 0.1 µF ceramic decoupling per device |
| VCC | Power Supply | +5V ±10% main supply; must be applied simultaneously with or before OE/VPP during programming |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical pulse width enables <1 second full-device programming - critical for high-throughput production programming lines |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device ID (0x0D) accessible via A9=12V and A0 toggle - ensures correct algorithm selection by universal programmers |
| Two-Line Control Architecture | Independent CE and OE/VPP pins allow flexible memory mapping and elimination of bus contention in multi-peripheral systems |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2,000V ESD protection support stable operation in electrically noisy industrial environments |
| JEDEC-Standard Packaging Options | 28-lead PDIP (AT27C512R-12JC) shares footprint compatibility with legacy 27C512 variants - simplifies drop-in replacement in existing PCBs |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS ROM |
|---|---|
Use Scenario: Fixed-function programmable logic controller storing ladder logic and I/O configuration in factory automation cabinets. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic startup sequence and runtime firmware execution without DRAM refresh overhead. Use Value: 120 ns access time eliminates WAIT states on 80C31-based controllers running at 6 MHz, ensuring sub-100 µs instruction fetch latency. |
Use Scenario: Motherboard BIOS ROM in early x86 systems where firmware integrity and cold-boot reliability are mandatory. IC Role / Device Role / Timing Role: Primary boot vector source mapped to 0xFFFF0h; provides reset vector and POST initialization code. Use Value: OTP architecture prevents accidental overwrite during system operation - critical for unattended kiosk and medical diagnostic equipment. |
| Automotive Engine Control Unit Bootloader | Test Equipment Microcode Repository |
Use Scenario: Embedded bootloader in engine management systems that loads calibrated fuel maps from external flash after power-up. IC Role / Device Role / Timing Role: Secure, tamper-resistant first-stage loader executing before CAN communication initialization. Use Value: Commercial-grade AT27C512R-12JC variant meets AEC-Q200 Class 2 thermal cycling requirements when mounted with conformal coating. |
Use Scenario: Calibration microcode storage in automated test equipment (ATE) used for semiconductor wafer probing. IC Role / Device Role / Timing Role: Read-only instruction store for FPGA-based pattern generators controlling DUT stimulus sequences. Use Value: 5V CMOS/TTL compatibility allows direct connection to Xilinx XC9500 CPLDs without level translators - reducing BOM count and signal integrity risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-12JC | No integrated product ID code; lacks Rapid™ programming algorithm; 120 ns access time identical | Requires manual algorithm selection in programming tools; unsuitable for automated high-volume programming lines | Select AT27C512R-12JC when using modern gang programmers with auto-ID detection or when production yield optimization is required |
| MX27C512PC-12 | Same 64K×8 organization and 120 ns speed grade; 2,000V ESD but only 100 mA latchup rating | Valid for commercial-temperature board-level replacements but not recommended for high-noise engine bay environments | Choose MX27C512PC-12 only for cost-sensitive, low-volume repair scenarios where Atmel part availability is constrained |
Compared with AT27C512-12JC and MX27C512PC-12, the AT27C512R-12JC uniquely combines rapid programming verification, electronic ID coding, and enhanced latchup immunity - making it the preferred choice for new designs requiring production scalability and field reliability in mixed-signal industrial systems.
Availability
AT27C512R-12JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS replacement, and automotive ECU bootloader applications requiring stable component supply across extended product lifecycles.
Supply support for AT27C512R-12JC 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 fabless semiconductor company specializing in microcontrollers, non-volatile memory, and secure authentication ICs for embedded systems.
The AT27C512R product line was designed to deliver high-reliability, low-power OTP EPROM solutions for firmware storage in cost-sensitive, long-lifecycle industrial and computing applications - emphasizing programming speed, electrical robustness, and JEDEC footprint compatibility.
FAQ
What is the maximum programming voltage required for AT27C512R-12JC?
The AT27C512R-12JC requires OE/VPP = 12.0 V ± 0.5 V during programming, with VID on A9 specified at 11.5 V to 12.5 V for product identification access. This voltage must be applied concurrently with VCC = 6.5 V ± 0.25 V; exceeding 14.0 V on A9 or OE/VPP risks permanent damage per absolute maximum ratings.
Does AT27C512R-12JC support read operations at 5 MHz bus frequency?
Yes, AT27C512R-12JC supports active-mode read operations at up to 5 MHz with ICC ≤ 20 mA, as confirmed in DC operating characteristics. Its 120 ns tACC ensures compatibility with 80C31, Z80, and 68000 derivatives operating at ≤8.3 MHz without wait states.
Can AT27C512R-12JC be used as a direct replacement for AT27C512-12JC on an existing PCB?
Yes, AT27C512R-12JC is pin-compatible and functionally backward-compatible with AT27C512-12JC in read mode. However, programming requires updated algorithms to leverage the integrated ID code and Rapid™ pulse timing - legacy programmers may need firmware updates to recognize AT27C512R-12JC correctly.
What decoupling capacitance is required for stable operation of AT27C512R-12JC?
Each AT27C512R-12JC 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 EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the array's power entry point to suppress supply rail droop during simultaneous output transitions.
Is AT27C512R-12JC qualified for automotive applications?
No, AT27C512R-12JC is rated for commercial temperature range (0°C to 70°C) only. For automotive use, Atmel specifies AT27C512R-12JA (–40°C to +125°C), which shares identical electrical specs but undergoes additional qualification testing per AEC-Q100 stress requirements - AT27C512R-12JC must not be deployed in under-hood or safety-critical vehicle subsystems.
AT27C512R-12JC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27C512R-12JC FAQ
1.How can I place an order for AT27C512R-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-12JC 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-12JC reliable?
The price and inventory of AT27C512R-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-12JC is usually 5 days.
3.What payment methods are accepted for AT27C512R-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-12JC?
AT27C512R-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-12JC 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-12JC?
For technical support, including AT27C512R-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-12JC requirements.
6.How does Aetrix verify that AT27C512R-12JC is sourced from the original manufacturer or authorized distributors?
All AT27C512R-12JC 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-12JC meets industry standards.
7.What is the process for return or replacement of AT27C512R-12JC?
All AT27C512R-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-12JC, 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-12JC part is unused and in its original packaging.
Return procedure for AT27C512R-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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