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Microchip Technology AT27C512R-12PC
- Part No.:
- AT27C512R-12PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C512R-12PC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,024
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Product details
Overview
AT27C512R-12PC from Microchip Technology (formerly Atmel) is a 64K × 8-bit one-time programmable EPROM used for non-volatile firmware storage in microprocessor systems. It delivers 45 ns read access time, operates on a single 5V ±10% supply, supports commercial temperature range (0°C to 70°C), and features CMOS/TTL-compatible I/O with 2,000V ESD protection - enabling reliable boot code retention in embedded controllers and industrial PLCs.
For engineers reviewing the AT27C512R-12PC datasheet, AT27C512R-12PC pinout, AT27C512R-12PC application, or AT27C512R-12PC equivalent, key selection criteria include verified 45 ns tACC timing, JEDEC-standard 28-lead PDIP package compatibility, OTP programming integrity under 13.0V VPP, and system-level bus contention avoidance via dual-line CE/OE control.
Technical Context
The AT27C512R-12PC implements a standard OTP EPROM architecture with address decoding for A0–A15 and 8-bit bidirectional data outputs O0–O7. Its two-line enable scheme (CE and OE/VPP) allows independent control of chip select and output gating, supporting high-speed read cycles without WAIT states in 8/16-bit bus systems.
Programming uses the Rapid™ algorithm with 100 µs/byte CE pulses at VCC = 6.5V and OE/VPP = 13.0V, while product identification is enabled via A9 voltage sensing (12.0V ±0.5V) and A0 toggling to retrieve manufacturer (0x1E) and device code (0x0D) bytes - ensuring compatibility with industry-standard programmers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64K × 8-bit (524,288 bits), sufficient for full boot ROM or configuration tables in legacy MCU designs |
| Read Access Time | 45 ns max - eliminates WAIT states on 5 MHz Z80, 8086, or 68000-based systems |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead |
| Active Current | 20 mA max at 5 MHz - enables low-power operation in battery-backed or energy-constrained systems |
| Standby Current | 100 µA max - reduces quiescent power in always-on controller modules |
| ESD Protection | 2,000V HBM - meets industrial handling requirements without external protection circuitry |
| Latchup Immunity | 200 mA - prevents destructive latchup during transient overvoltage events on VCC or I/O lines |
Pinout & Package
AT27C512R-12PC is packaged in a 28-lead, 0.600-inch wide plastic dual in-line package (PDIP), per JEDEC MS-011 AB standard. Pin 1 is index-marked; pins are numbered counter-clockwise from top-left corner when viewed from top with notch or dot oriented left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; fully decoded to select one of 65,536 memory locations |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; high-impedance when CE or OE is inactive |
| CE | Chip Enable | Active-low global enable; must be asserted before OE/VPP to avoid bus contention |
| OE/VPP | Output Enable / Programming Voltage | Active-low output gate in read mode; supplies 13.0V programming voltage during OTP write |
| 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 to low-impedance ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time ensures fast firmware updates during manufacturing test |
| Integrated Product Identification Code | Electronic ID (0x1E/0x0D) enables automatic algorithm selection in universal programmers |
| Dual-Line Control (CE + OE) | Prevents bus contention in multi-device systems by allowing independent chip and output enable |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2,000V ESD rating support operation in harsh industrial environments |
| JEDEC-Standard Packaging | 28P6 PDIP footprint ensures drop-in replacement for legacy 27C512 variants and compatibility with existing sockets |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic execution firmware in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 45 ns instruction fetch timing to ensure real-time scan cycle consistency. Use Value: Eliminates reliance on volatile RAM + battery backup; retains program across power loss with zero runtime overhead. | Use Scenario: Hosting startup code and interrupt vectors for Z80 or 8086-based embedded controllers in test equipment. IC Role / Device Role / Timing Role: Primary read-only instruction store accessed directly by CPU address/data bus during reset sequence. Use Value: Guarantees sub-50 ns instruction fetch latency, removing need for WAIT state generators in high-speed bus designs. |
| Automotive Instrument Cluster Calibration Data | Medical Device Configuration Memory |
Use Scenario: Holding calibrated sensor offsets and display mapping tables in automotive dashboards operating across -40°C to +125°C. IC Role / Device Role / Timing Role: OTP storage for immutable calibration parameters, accessed only during power-up initialization. Use Value: Automotive-grade temperature range (-40°C to +125°C option available) ensures data integrity under thermal cycling stress. | Use Scenario: Storing FDA-approved device configuration profiles (e.g., infusion pump delivery algorithms) requiring tamper-proof persistence. IC Role / Device Role / Timing Role: Secure, one-time-programmable memory preventing field modification of safety-critical operational parameters. Use Value: OTP architecture provides inherent write-protection - no risk of accidental overwrite during device operation or service. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-12PC | No integrated product ID code; lacks Rapid™ programming algorithm; 200 µs/byte typical programming time | Same pinout and timing, but requires manual algorithm selection in programmers; lower production throughput | Select AT27C512R-12PC when automated programming and ID verification are required in high-volume manufacturing. |
| MX27C512PC-12 | Same 64K×8 OTP structure and 45 ns access, but rated for 10,000 program/erase cycles (not OTP); uses different VPP timing | Not truly OTP - supports limited reprogramming, introducing potential for unintended field updates | Choose AT27C512R-12PC where absolute firmware immutability and certified one-time programming are mandatory. |
Compared with AT27C512-12PC and MX27C512PC-12, the AT27C512R-12PC uniquely combines guaranteed 45 ns read timing, integrated electronic ID, and Rapid™ programming - making it optimal for high-reliability, high-throughput firmware programming in industrial and automotive contexts.
Availability
AT27C512R-12PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and automotive instrument cluster calibration data requiring stable component supply and long-term obsolescence management.
Supply support for AT27C512R-12PC 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 the AT27C512R series.
The AT27C512R belongs to Atmel's OTP EPROM product line, designed specifically for cost-sensitive, high-reliability firmware storage in industrial control, automotive, and medical systems where data immutability and JEDEC-standard compatibility are essential.
FAQ
What is the maximum operating temperature range for AT27C512R-12PC?
The AT27C512R-12PC is specified for commercial operation from 0°C to +70°C. While the base AT27C512R family offers industrial (-40°C to +85°C) and automotive (-40°C to +125°C) variants, the -12PC suffix explicitly denotes the commercial temperature grade. This is confirmed in the Ordering Information table on page 10 of the datasheet, where AT27C512R-12PC maps to "Commercial (0°C to 70°C)" and package 28P6.
Does AT27C512R-12PC support in-system programming?
No, AT27C512R-12PC does not support in-system programming. It requires dedicated EPROM programmers that apply 13.0V to the OE/VPP pin and 6.5V to VCC during programming. The device lacks serial interfaces, JTAG, or ISP circuitry; programming must occur in a socketed fixture prior to PCB assembly, as defined in the Rapid Programming Algorithm section (page 8).
What decoupling capacitance is required for stable operation of AT27C512R-12PC?
Each AT27C512R-12PC requires a minimum 0.1 µF high-frequency ceramic capacitor connected between VCC and GND, placed as close to the device pins as possible. For boards with multiple EPROMs, a bulk 4.7 µF electrolytic capacitor should also be added near the main power entry point - both values are specified in the "System Considerations" section (page 2) to suppress switching transients and maintain VCC stability during CE transitions.
Is AT27C512R-12PC pin-compatible with older AT27C512 versions?
Yes, AT27C512R-12PC is pin-compatible with earlier AT27C512 variants in the same 28-lead PDIP package (28P6). Pin functions (A0–A15, O0–O7, CE, OE/VPP, VCC, GND) match identically, and DC/AC timing parameters are backward-compatible. However, the "R" suffix adds integrated product ID and Rapid™ programming - features transparent to pin-level connectivity but requiring updated programmer firmware.
What is the purpose of the OE/VPP pin on AT27C512R-12PC?
The OE/VPP pin on AT27C512R-12PC serves a dual function: during normal read operation, it acts as Output Enable (active-low), controlling data bus drivers; during programming, it accepts 13.0V ±0.25V as the programming voltage (VPP) to alter the floating-gate cells. This shared pin design reduces package count while maintaining JEDEC compatibility - confirmed in the Pin Configurations (page 1) and Operating Modes table (page 3).
AT27C512R-12PC 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:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-PDIP
AT27C512R-12PC FAQ
1.How can I place an order for AT27C512R-12PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-12PC 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-12PC reliable?
The price and inventory of AT27C512R-12PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-12PC is usually 5 days.
3.What payment methods are accepted for AT27C512R-12PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-12PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-12PC?
AT27C512R-12PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-12PC 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-12PC?
For technical support, including AT27C512R-12PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-12PC requirements.
6.How does Aetrix verify that AT27C512R-12PC is sourced from the original manufacturer or authorized distributors?
All AT27C512R-12PC 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-12PC meets industry standards.
7.What is the process for return or replacement of AT27C512R-12PC?
All AT27C512R-12PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-12PC, 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-12PC part is unused and in its original packaging.
Return procedure for AT27C512R-12PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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