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Microchip Technology AT27C512R-15RI
- Part No.:
- AT27C512R-15RI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27C512R-15RI.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,043
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Product details
Overview
AT27C512R-15RI from Microchip Technology (formerly Atmel) is a 512 Kbit one-time programmable EPROM organized as 64K × 8, operating from a single 5V ±10% supply with 150 ns maximum access time and industrial temperature range (–40°C to +85°C). It features CMOS/TTL-compatible I/O, dual-line control (CE/OE), and integrated product identification code for automated programming. Used in firmware storage for microcontroller-based embedded systems where non-volatility, reliability, and bus compatibility are critical.
For engineers reviewing the AT27C512R-15RI datasheet, AT27C512R-15RI pinout, AT27C512R-15RI application, or AT27C512R-15RI equivalent, key selection criteria include read access timing, standby current (≤100 µA), OTP programming voltage requirements (VPP = 13.0 V), JEDEC-standard package options (SOIC/PLCC/PDIP/TSOP), and industrial-grade thermal performance.
Technical Context
The AT27C512R-15RI implements a standard OTP EPROM architecture with address decoding for A0–A15, eight bidirectional data outputs (O0–O7), and two active-low control lines: Chip Enable (CE) and Output Enable/VPP. 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 distinct operating modes: Read (CE = OE = VIL), Standby (CE = VIH), and Rapid Program (CE = VIL, OE/VPP = VPP). The device includes on-chip product identification logic that decodes manufacturer (0x1E) and device code (0x0D) via A9 high-voltage sensing (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 code or fixed firmware in 8-bit microprocessor systems |
| Read Access Time | 150 ns max - ensures compatibility with 6–7 MHz Z80/8085/68000-class systems without wait states |
| VCC Supply | 5 V ±10% - single-supply operation eliminates need for auxiliary voltage rails |
| Standby Current | 100 µA max - enables low-power retention in battery-backed or energy-sensitive designs |
| Active Current | 20 mA max at 5 MHz - supports sustained read bursts without thermal derating |
| ESD Protection | 2,000 V HBM - meets industrial handling requirements without external protection |
| Latchup Immunity | 200 mA - withstands transient overcurrent events per JEDEC JESD78 |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, instrumentation, and factory automation |
Pinout & Package
AT27C512R-15RI is supplied in a 28-lead SOIC (package code "R", JEDEC MS-012AB), 300-mil body width, gull-wing lead form. Pin 1 is marked by a beveled corner or index notch; leads are spaced 0.050" (1.27 mm) center-to-center.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; latched internally on CE assertion for memory location selection |
| O0–O7 | Data Outputs | CMOS/TTL-compatible 8-bit bidirectional data bus; high-impedance when CE or OE is high |
| CE | Chip Enable | Primary chip-select; device enters standby (high-Z outputs) when high; required for all operations |
| OE/VPP | Output Enable / Programming Voltage | In read mode: output enable (active-low); in program mode: 13.0 V programming supply input |
| GND | Ground Reference | Signal and power return; requires local 0.1 µF ceramic decoupling per device |
| VCC | Power Supply | +5 V ±10% supply; must be applied simultaneously with or before OE/VPP during programming |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time enables high-throughput production programming with verification loop |
| Integrated Product ID Code | Manufacturer (0x1E) and device code (0x0D) readable via A9=12.0 V and A0 toggle - ensures correct algorithm selection in automated programmers |
| Dual-Line Control Architecture | Independent CE and OE pins prevent bus contention in multi-device memory maps and simplify timing design |
| High-Reliability CMOS Process | 2,000 V ESD rating and 200 mA latchup immunity reduce field failure risk in uncontrolled environments |
| JEDEC-Standard Packaging | Available in PDIP, PLCC, SOIC, and TSOP - enables drop-in replacement across legacy board designs |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic firmware in programmable logic controllers deployed in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 150 ns read access to initialization code for 8051- or 68HC11-based control engines. Use Value: Eliminates reliance on slow serial EEPROM or unreliable battery-backed SRAM; withstands industrial ESD and thermal cycling without data loss. |
Use Scenario: Holding immutable BIOS or monitor code in vintage test equipment (e.g., oscilloscopes, spectrum analyzers) requiring long-term firmware stability. IC Role / Device Role / Timing Role: Primary 64K×8 read-only memory mapped into upper address space of Z80 or 8085 CPUs during cold start. Use Value: Guarantees bit-perfect firmware retrieval across decades of storage; no refresh or write-cycle wear-out concerns inherent to flash or DRAM. |
| Automotive Instrument Cluster Calibration Data | Medical Device Configuration Memory |
Use Scenario: Storing calibrated sensor offsets and display lookup tables in automotive instrument clusters operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: OTP configuration store accessed only at power-up; no runtime writes required after factory calibration. Use Value: Prevents accidental field corruption; meets AEC-Q100 stress requirements via industrial-grade qualification and 200 mA latchup immunity. |
Use Scenario: Retaining FDA-approved device parameters (e.g., alarm thresholds, sampling rates) in Class II medical instruments where firmware integrity is regulatory-critical. IC Role / Device Role / Timing Role: Immutable configuration repository read once at initialization; isolated from software update paths to prevent tampering. Use Value: Provides auditable, unalterable parameter storage compliant with IEC 62304 §5.5.2 for safety-related data retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-15PI | Same die, identical AC/DC specs, but lacks Rapid™ programming algorithm support and product ID code; no VPP-sensing capability on A9 | Requires legacy programming hardware; unsuitable for automated ID-based algorithm selection | Select only if using older programmers incompatible with Rapid™ protocol or ID verification |
| MX27C512-15PC | Pin-compatible 64K×8 OTP EPROM; 150 ns access, 5 V supply, but rated only for commercial temp (0°C to 70°C); no integrated ID code | Not qualified for industrial environments; lacks A9-based identification for automated programming | Acceptable for cost-sensitive, non-industrial applications where extended temperature range is unnecessary |
Compared with AT27C512R-15RI, AT27C512-15PI omits programmable identification and rapid programming, increasing production setup time, while MX27C512-15PC sacrifices industrial temperature rating and ID functionality-making AT27C512R-15RI the sole choice for automated, high-reliability industrial firmware storage.
Availability
AT27C512R-15RI is available at Aetrix Electronics and suitable for industrial control systems, legacy microcontroller boot applications, and medical device configuration storage requiring stable component supply across extended lifecycles.
Supply support for AT27C512R-15RI 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 datasheets, programming specifications, and long-term supply commitments.
The AT27C512R belongs to Atmel's OTP EPROM family designed specifically for reliable, low-power, pin-compatible firmware storage in industrial, automotive, and medical systems where flash endurance or battery backup are unacceptable trade-offs.
FAQ
What is the programming voltage requirement for AT27C512R-15RI?
The AT27C512R-15RI requires OE/VPP = 13.0 V ±0.25 V during programming, with VCC raised to 6.5 V ±0.25 V. This dual-voltage scheme enables the Rapid™ algorithm and activates the internal high-voltage programming circuitry. Applying 13.0 V to OE/VPP while VCC remains at 5 V will not program the device and may cause undefined behavior. Always follow the sequencing requirement: VCC must be applied simultaneously with or before OE/VPP.
Does AT27C512R-15RI support in-system programming?
No, AT27C512R-15RI does not support in-system programming. It is a one-time programmable (OTP) EPROM requiring dedicated UV-erasable or parallel programming equipment. Programming must occur off-board using a certified EPROM programmer capable of delivering 13.0 V to OE/VPP and executing the Rapid™ algorithm. The device lacks ISP interfaces such as SPI, JTAG, or SWD, and has no internal bootloader or command-set for field updates.
What is the meaning of "R" and "I" in AT27C512R-15RI?
In AT27C512R-15RI, "R" denotes the 28-lead SOIC package (JEDEC MS-012AB), and "I" specifies the industrial temperature range (–40°C to +85°C). The "15" indicates 150 ns maximum access time. The "AT27C512R" base part number identifies the Rapid™-enabled, product-ID-equipped variant of the 512 Kbit OTP EPROM, distinguishing it from the legacy AT27C512 without those features.
Can AT27C512R-15RI be used as a direct replacement for AT27C512-15PI?
AT27C512R-15RI is electrically and physically pin-compatible with AT27C512-15PI and shares identical read timing, power, and DC characteristics. However, it adds Rapid™ programming and product ID code functionality. In read-mode operation, substitution is seamless. During programming, AT27C512R-15RI requires ID-aware equipment; legacy programmers designed only for AT27C512-15PI may fail to recognize or correctly program AT27C512R-15RI.
What decoupling capacitance is required for stable operation of AT27C512R-15RI?
Each AT27C512R-15RI requires a minimum 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device's power pins. For boards containing multiple AT27C512R-15RI devices or large EPROM arrays, a bulk 4.7 µF electrolytic capacitor must also be placed near the main power entry point. These values are specified in the "System Considerations" section of the datasheet to suppress switching transients and maintain VCC stability during CE transitions.
AT27C512R-15RI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-SOIC (0.342", 8.69mm Width)
- 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:
- 150 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT27C512R-15RI FAQ
1.How can I place an order for AT27C512R-15RI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-15RI 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-15RI reliable?
The price and inventory of AT27C512R-15RI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-15RI is usually 5 days.
3.What payment methods are accepted for AT27C512R-15RI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-15RI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-15RI?
AT27C512R-15RI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-15RI 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-15RI?
For technical support, including AT27C512R-15RI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-15RI requirements.
6.How does Aetrix verify that AT27C512R-15RI is sourced from the original manufacturer or authorized distributors?
All AT27C512R-15RI 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-15RI meets industry standards.
7.What is the process for return or replacement of AT27C512R-15RI?
All AT27C512R-15RI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-15RI, 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-15RI part is unused and in its original packaging.
Return procedure for AT27C512R-15RI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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