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Microchip Technology AT27C512R-90RA
- Part No.:
- AT27C512R-90RA
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-90RA.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,509
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Product details
Overview
AT27C512R-90RA from Atmel is a 64K × 8-bit one-time programmable EPROM (OTP EPROM) with 90 ns maximum access time, 5V ±10% supply, and automotive-grade operation (-40°C to +125°C). It features CMOS/TTL-compatible I/O, dual-line control (CE/OE), and integrated product identification code for automated programming. Used in engine control units and industrial firmware storage where non-volatile, pin-stable boot code retention is required.
For engineers reviewing the AT27C512R-90RA datasheet, AT27C512R-90RA pinout, AT27C512R-90RA application, or AT27C512R-90RA equivalent, key selection criteria include read access timing, standby current (<100 µA), VPP programming voltage (12.0 V ±0.5 V), and JEDEC-standard SOIC-28 packaging compatibility with legacy 27C512 designs.
Technical Context
The AT27C512R-90RA implements a standard OTP EPROM architecture with address decoding for A0–A15, 8-bit bidirectional data outputs (O0–O7), and dual-control logic using CE (chip enable) and OE/VPP (output enable/programming voltage). Its Rapid™ programming algorithm uses 100 µs CE pulses at VCC = 6.5 V and OE/VPP = 13.0 V for byte-level programming.
It supports three operating modes: Read (CE=VIL, OE=VIL), Standby (CE=VIH), and Rapid Program (CE=VIL, OE/VPP=VPP). Product identification is accessed by holding A1–A15 low, setting A9 to 12.0 V, and toggling A0 to select manufacturer (0x1E) or device code (0x0D) bytes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64K × 8 bits (524,288-bit OTP EPROM) |
| Access Time | 90 ns max - ensures no WAIT states needed on 11 MHz microprocessor buses |
| VCC Supply | 5 V ±10% - compatible with standard TTL/CMOS logic rails without regulation |
| Standby Current | 100 µA max - enables low-power firmware storage in always-on automotive modules |
| Programming Voltage | VPP = 12.0 V ±0.5 V on OE/VPP pin - requires dedicated high-voltage programming circuitry |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive ECUs and industrial controllers |
| ESD Protection | 2,000 V HBM - withstands handling in uncontrolled manufacturing environments |
Pinout & Package
AT27C512R-90RA is supplied in a 28-lead, 0.330" wide plastic gull-wing small outline (SOIC) package per JEDEC MS-012AB, with 1.27 mm pitch and surface-mount compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; latched internally during read or program cycles |
| O0–O7 | Data Outputs | Tri-state CMOS/TTL-compatible outputs; high-impedance when CE or OE inactive |
| CE | Chip Enable | Active-low global enable; controls device selection and power state transition |
| OE/VPP | Output Enable / Programming Voltage | Dual-function pin: VIL/VIH for read mode; 12 V for programming; must be sequenced with VCC |
| VCC | Power Supply | 5 V ±10% main supply; must be applied simultaneously with or before OE/VPP |
| GND | Ground Reference | Signal and power return; requires local 0.1 µF ceramic decoupling per device |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming | 100 µs/byte typical - reduces production programming time vs. legacy 27C512 parts |
| Integrated ID Code | Manufacturer ID (0x1E) and Device ID (0x0D) - enables auto-algorithm selection in universal programmers |
| Two-Line Control | Independent CE and OE/VPP - eliminates bus contention in multi-device memory maps |
| Automotive Qualification | -40°C to +125°C operation - meets AEC-Q100 stress test requirements for ECU firmware storage |
| JEDEC Standard Packages | SOIC-28 footprint - direct drop-in replacement for existing 27C512-based PCBs |
Applications
| Engine Control Unit (ECU) | Industrial PLC Firmware Storage |
|---|---|
Use Scenario: Stores calibrated fuel injection and ignition timing maps in gasoline/diesel powertrain control modules. IC Role / Device Role / Timing Role: Non-volatile boot ROM providing deterministic startup execution and runtime lookup tables. Use Value: 90 ns access time enables real-time sensor-to-actuator response within 10 µs interrupt latency budgets. | Use Scenario: Holds ladder logic firmware and I/O configuration data in modular programmable logic controllers. IC Role / Device Role / Timing Role: OTP EPROM used as immutable firmware image storage, immune to accidental overwrite. Use Value: Automotive temperature range ensures reliable operation in unconditioned factory cabinets with ambient swings up to 85°C. |
| Avionics Bootloader Memory | Medical Diagnostic Equipment BIOS |
Use Scenario: Stores certified bootloader code for flight-critical avionics processors requiring DO-254 compliance. IC Role / Device Role / Timing Role: One-time programmable ROM ensuring firmware integrity and traceability across aircraft service life. Use Value: Integrated product ID code provides verifiable chain-of-custody for configuration management audits. | Use Scenario: Retains system initialization routines and calibration constants in portable ultrasound and MRI subsystems. IC Role / Device Role / Timing Role: Power-fail-safe firmware repository that retains data without battery backup. Use Value: 100 µA max standby current extends battery runtime during transport or standby modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-90RA | No "R" revision suffix; lacks Rapid™ programming algorithm and integrated ID code | Requires longer programming time (200+ µs/byte); no auto-identification in programming tools | Select AT27C512R-90RA when production throughput or programmer compatibility is critical. |
| MX27C512PC-90 | Same 64K×8 OTP EPROM function but Macronix; 90 ns access, 5V supply, PDIP-28 only | Not qualified for automotive temperature range; no SOIC-28 or PLCC variants available | Choose AT27C512R-90RA for surface-mount automotive designs requiring SOIC-28 and -40°C to +125°C rating. |
Compared with AT27C512-90RA, the AT27C512R-90RA delivers faster programming and built-in identification-critical for high-volume manufacturing-while MX27C512PC-90 offers cost parity but lacks automotive qualification and SOIC packaging, limiting board-level flexibility.
Availability
AT27C512R-90RA is available at Aetrix Electronics and suitable for engine control units, industrial PLCs, avionics bootloaders, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT27C512R-90RA 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 was a U.S.-based semiconductor designer specializing in microcontrollers, non-volatile memory, and secure authentication ICs before its acquisition by Microchip Technology in 2016.
The AT27C512R series belongs to Atmel's OTP EPROM product line, engineered for firmware storage in automotive, industrial, and aerospace systems where data immutability, temperature resilience, and programming efficiency are essential.
FAQ
What is the programming voltage requirement for AT27C512R-90RA?
The AT27C512R-90RA requires VPP = 12.0 V ±0.5 V applied to the OE/VPP pin during programming, with VCC simultaneously held at 6.5 V ±0.25 V. This high-voltage condition must be strictly sequenced: VCC must be applied before or simultaneously with OE/VPP, and removed after or simultaneously with it. Failure to observe this sequencing risks device damage or incomplete programming.
Does AT27C512R-90RA support automatic device identification in programming tools?
Yes, the AT27C512R-90RA includes an integrated product identification code accessible via A0 and A9 pins. With A1–A15 held low, applying 12.0 V to A9 and toggling A0 selects either the Manufacturer ID (0x1E) or Device ID (0x0D). This allows industry-standard programmers to auto-detect the part and load correct algorithms and voltage profiles without manual setup.
Can AT27C512R-90RA be used as a direct replacement for older AT27C512 parts?
AT27C512R-90RA is pin- and function-compatible with legacy AT27C512 variants in SOIC-28, PDIP-28, PLCC-32, and TSOP-28 packages. However, it adds Rapid™ programming and ID code features not present in pre-R versions. Electrical timing and DC specs match, making it a drop-in hardware replacement-but firmware programming workflows must be updated to leverage the enhanced capabilities of AT27C512R-90RA.
What decoupling capacitance is required for stable operation of AT27C512R-90RA?
Each AT27C512R-90RA requires a minimum 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 bulk 4.7 µF electrolytic capacitor should also be placed near the power entry point to stabilize the array's shared VCC rail. These values are specified in the "System Considerations" section of the AT27C512R-90RA datasheet to prevent transient-induced non-conformance.
Is AT27C512R-90RA qualified for automotive applications?
Yes, the "RA" suffix in AT27C512R-90RA denotes automotive qualification per the ordering table, specifying operation from -40°C to +125°C and compliance with AEC-Q100 stress testing requirements. It is intended for use in engine control units, transmission control modules, and other under-hood automotive electronics where extended temperature resilience and long-term data retention are mandatory.
AT27C512R-90RA 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 ~ 125°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27C512R-90RA FAQ
1.How can I place an order for AT27C512R-90RA through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-90RA 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-90RA reliable?
The price and inventory of AT27C512R-90RA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-90RA is usually 5 days.
3.What payment methods are accepted for AT27C512R-90RA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-90RA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-90RA?
AT27C512R-90RA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-90RA 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-90RA?
For technical support, including AT27C512R-90RA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-90RA requirements.
6.How does Aetrix verify that AT27C512R-90RA is sourced from the original manufacturer or authorized distributors?
All AT27C512R-90RA 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-90RA meets industry standards.
7.What is the process for return or replacement of AT27C512R-90RA?
All AT27C512R-90RA units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-90RA, 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-90RA part is unused and in its original packaging.
Return procedure for AT27C512R-90RA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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