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Microchip Technology AT27C512R-70RA
- Part No.:
- AT27C512R-70RA
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-70RA.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,518
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Product details
Overview
AT27C512R-70RA from Microchip Technology (formerly Atmel) is a 64K × 8-bit one-time programmable EPROM used for firmware storage in embedded microprocessor systems. It delivers 45 ns read access time, operates from a single 5V ±10% supply, and supports automotive temperature range (–40°C to +125°C) in a 28-lead SOIC package.
For engineers reviewing the AT27C512R-70RA datasheet, AT27C512R-70RA pinout, AT27C512R-70RA application, or AT27C512R-70RA equivalent, key selection criteria include verified 45 ns tACC timing, 100 µA max standby current, JEDEC-compliant SOIC packaging, and Rapid™ programming compatibility at 100 µs/byte.
Technical Context
The AT27C512R-70RA implements a two-line control architecture with Chip Enable (CE) and Output Enable/VPP (OE/VPP), enabling bus contention avoidance in multi-device memory systems. Its CMOS/TTL-compatible I/O interface ensures seamless integration with legacy 5V microcontrollers and logic families.
It uses Atmel's scaled CMOS process with 2,000V ESD protection and 200 mA latchup immunity, supporting reliable operation in harsh automotive environments. Programming requires VCC = 6.5V and OE/VPP = 13.0V, with address-specific 100 µs CE pulses and verification loops per byte.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8), sufficient for boot code or fixed firmware in 8-bit/16-bit MCU systems |
| Read Access Time (tACC) | 70 ns max (–70 speed grade), enables direct connection to 10–14 MHz microprocessors without wait states |
| VCC Supply | 5V ±10%, compatible with standard TTL/CMOS logic rails and eliminates need for auxiliary voltage regulators |
| Standby Current (ISB1) | 100 µA max (CMOS mode), critical for low-power automotive modules during sleep modes |
| Active Current (ICC) | 20 mA max at 5 MHz, supports sustained read bursts without thermal derating in compact PCB layouts |
| Operating Temperature | –40°C to +125°C (Automotive grade), validated for under-hood ECUs and body control modules |
| Programming Voltage (VPP) | 13.0V ±0.25V on OE/VPP pin, requires dedicated high-voltage programming circuitry or certified EPROM programmer |
Pinout & Package
AT27C512R-70RA is packaged in a 28-lead SOIC (package code "28R"), 0.330" wide, JEDEC MS-012 compliant, with gull-wing leads and 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; A0–A15 select one of 64K bytes; all must be stable before CE/OE assertion |
| 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 enable/disable; switching CE causes transient VCC excursions requiring local 0.1 µF decoupling |
| OE/VPP | Output Enable / Programming Voltage | Dual-function pin: low during read (OE), high at 13.0V during programming (VPP); must be applied after VCC |
| GND | Ground Reference | Signal and power ground reference; requires low-inductance connection to minimize noise coupling into memory array |
| VCC | Power Supply | +5V ±10% supply; must be applied simultaneously with or before OE/VPP; bulk 4.7 µF capacitor recommended for EPROM arrays |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verification loop; reduces production programming cycle time by >5× vs. legacy EPROMs |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0D) readable via A9=12.0V and A0 toggle; enables automatic algorithm selection in industrial programmers |
| Two-Line Control (CE + OE/VPP) | Independent chip and output enable allows flexible bus arbitration-critical for shared data buses in multi-peripheral MCU designs |
| High-Reliability CMOS Process | 2,000V HBM ESD rating and 200 mA latchup immunity ensure robustness in automotive assembly and field operation |
| JEDEC-Standard Packaging | SOIC (28R), PDIP (28P6), PLCC (32J), TSOP (28T) options support legacy through-hole, surface-mount, and space-constrained applications |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC Firmware Storage |
|---|---|
|
Use Scenario: Stores calibrated fuel injection maps and diagnostic routines in engine management systems operating under hood temperatures up to +125°C. IC Role / Device Role / Timing Role: Nonvolatile firmware ROM providing deterministic 70 ns read latency to 8051- or HC11-based controllers during real-time combustion cycles. Use Value: Automotive-grade temperature rating and 100 µA standby current extend battery life in always-on vehicle modules while ensuring firmware integrity across 15+ year service life. |
Use Scenario: Holds ladder logic interpreter and I/O configuration tables in DIN-rail mounted programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: OTP EPROM serving as immutable program store; accessed via parallel bus during PLC scan cycles with no software overhead. Use Value: One-time programmability prevents accidental firmware corruption during field maintenance; 20 mA active current enables stable operation with unregulated 5V supplies common in industrial power rails. |
| Legacy Medical Device Boot ROM | Avionics Display System Firmware |
|
Use Scenario: Stores boot loader and safety-critical initialization code in Class II medical instruments where firmware revision control and traceability are mandated. IC Role / Device Role / Timing Role: Read-only memory mapped at reset vector; provides immediate instruction fetch without external configuration or initialization delay. Use Value: Integrated product ID code (0x1E/0x0D) enables automated BOM verification and lot traceability during FDA-regulated manufacturing audits. |
Use Scenario: Holds display driver firmware and font assets in cockpit multifunction displays subject to DO-160 environmental stress testing. IC Role / Device Role / Timing Role: Fixed-function memory providing pixel buffer initialization and character rendering tables to dedicated display controllers. Use Value: 2,000V ESD protection and –40°C to +125°C operation meet airborne equipment surge and thermal cycling requirements without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-70PC | Same core die but in 28-lead PDIP; lacks automotive temp rating (0°C to +70°C only); no AEC-Q100 qualification | Restricted to commercial benchtop or lab equipment; unsuitable for under-hood or mobile industrial use | Select only for prototyping or non-automotive cost-sensitive designs where SOIC reflow is unavailable |
| MX27C512-70PC | Macronix second-source part; identical 64K×8 organization and 70 ns timing; same pinout and VPP requirements | Validated for identical automotive and industrial applications; full drop-in replacement per manufacturer cross-reference | Preferred for dual-sourcing strategy; shares same programming algorithms and identification code structure as AT27C512R-70RA |
Compared with AT27C512R-70RA, AT27C512-70PC sacrifices automotive reliability for lower cost and through-hole assembly, while MX27C512-70PC offers identical functionality with supply chain redundancy-making it the only true functional and qualification-aligned alternative.
Availability
AT27C512R-70RA is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, legacy medical devices, and avionics display systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT27C512R-70RA 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 microcontrollers and nonvolatile memory solutions for demanding industrial and automotive markets.
The AT27C512R product line was designed specifically for legacy system firmware storage where OTP security, deterministic timing, and long-term data retention (>20 years) are required-prioritizing robustness over reprogrammability.
FAQ
What is the maximum allowed VPP voltage for programming AT27C512R-70RA?
The AT27C512R-70RA requires OE/VPP = 13.0V ±0.25V during programming, as specified in the DC Programming Characteristics table. Exceeding 13.25V risks oxide damage to the floating-gate cells, while voltages below 12.75V may cause incomplete programming or byte failures during verification. Always apply VCC before OE/VPP and remove VCC after OE/VPP per the absolute maximum ratings note.
Can AT27C512R-70RA be used in place of AT27C512R-70JA?
No-AT27C512R-70RA and AT27C512R-70JA differ in package and temperature range: AT27C512R-70RA uses 28-lead SOIC (28R) and is rated for –40°C to +125°C (Automotive), while AT27C512R-70JA uses 32-lead PLCC (32J) and shares the same automotive temperature range. Pinouts are incompatible due to different lead counts and signal mapping; PCB layout changes are mandatory.
Does AT27C512R-70RA support read-modify-write operations?
No-AT27C512R-70RA is a one-time programmable (OTP) EPROM. Once programmed, its contents cannot be electrically erased or rewritten. Data modification requires physical replacement of the device. The Rapid™ algorithm only applies to initial programming; no in-system reprogramming capability exists.
What decoupling capacitance is required for stable AT27C512R-70RA operation?
Each AT27C512R-70RA requires a 0.1 µF ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins to suppress high-frequency transients caused by CE switching. For systems with multiple EPROMs, add a 4.7 µF bulk electrolytic capacitor near the power entry point to stabilize the 5V rail under dynamic load conditions.
How is the Manufacturer Identification Code read from AT27C512R-70RA?
To read the Manufacturer ID (0x1E) from AT27C512R-70RA, hold all address lines A0–A15 low except A9, which must be driven to 12.0V ±0.5V (VID), and toggle A0 low (VIL). The 8-bit ID appears on O0–O7. This requires a programmer capable of applying precise high-voltage to A9 while maintaining standard logic levels on other pins-standard microcontroller GPIO cannot perform this operation.
AT27C512R-70RA 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:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27C512R-70RA FAQ
1.How can I place an order for AT27C512R-70RA through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-70RA 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-70RA reliable?
The price and inventory of AT27C512R-70RA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-70RA is usually 5 days.
3.What payment methods are accepted for AT27C512R-70RA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-70RA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-70RA?
AT27C512R-70RA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-70RA 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-70RA?
For technical support, including AT27C512R-70RA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-70RA requirements.
6.How does Aetrix verify that AT27C512R-70RA is sourced from the original manufacturer or authorized distributors?
All AT27C512R-70RA 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-70RA meets industry standards.
7.What is the process for return or replacement of AT27C512R-70RA?
All AT27C512R-70RA units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-70RA, 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-70RA part is unused and in its original packaging.
Return procedure for AT27C512R-70RA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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