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Microchip Technology AT27C512R-15PI
- Part No.:
- AT27C512R-15PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C512R-15PI.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,004
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Product details
Overview
AT27C512R-15PI from Microchip Technology (formerly Atmel) is a 512 Kbit (64K × 8) one-time programmable EPROM designed for firmware storage in embedded microprocessor systems. It operates from a single 5V ±10% supply, delivers 45 ns read access time, supports industrial temperature range (–40°C to +85°C), and uses CMOS/TTL-compatible I/O for seamless integration with legacy controllers.
For engineers reviewing the AT27C512R-15PI datasheet, AT27C512R-15PI pinout, AT27C512R-15PI application, or AT27C512R-15PI equivalent, key selection criteria include OTP reliability, JEDEC-standard PDIP package compatibility, rapid programming (100 µs/byte), low active current (20 mA at 5 MHz), and dual-line control (CE/OE) for bus contention avoidance.
Technical Context
The AT27C512R-15PI implements a parallel-addressed OTP EPROM architecture with 16-bit address bus (A0–A15) and 8-bit bidirectional data bus (O0–O7). Its two-line enable scheme (CE and OE/VPP) enables precise output gating and eliminates bus conflicts during multi-device operation.
It features Rapid™ programming with 100 µs CE pulse width at VCC = 6.5 V and OE/VPP = 13.0 V, plus integrated product identification (manufacturer code 0x1E, device code 0x0D) accessed via A9 high-voltage (12.0 V ±0.5 V) and A0 toggling - enabling automated programmer recognition and algorithm selection.
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 microcontroller systems |
| Read Access Time | 150 ns max (tACC), enabling direct interface with 6–7 MHz Z80, 8085, or 68000-based systems without wait states |
| VCC Supply | 5 V ±10%, compatible with standard TTL/CMOS logic rails and eliminating need for auxiliary voltage regulators |
| Active Current | 20 mA max at 5 MHz, minimizing power budget impact in always-on industrial control modules |
| Standby Current | 100 µA max (ISB1, CMOS CE), supporting low-power sleep modes in battery-backed systems |
| ESD Protection | 2,000 V HBM, enhancing robustness during handling and PCB assembly in non-EPA environments |
| Latchup Immunity | 200 mA, preventing destructive latchup under transient overvoltage or ground bounce conditions |
Pinout & Package
AT27C512R-15PI is supplied in a 28-lead, 0.600-inch wide plastic dual inline package (PDIP), per JEDEC MS-011 AB standard. Pin 1 is marked by a notch or dot; leads are spaced 0.100 inch (2.54 mm) apart.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit unidirectional address bus selecting one of 64K bytes; driven by CPU address lines with no internal latching |
| O0–O7 | Data Outputs | 8-bit tristate outputs enabled only when CE = VIL and OE/VPP = VIL; directly connect to CPU data bus |
| CE | Chip Enable | Primary chip-select input; device enters standby (high-Z outputs) when CE = VIH, regardless of OE state |
| OE/VPP | Output Enable / Programming Voltage | In read mode: OE function (active-low); in programming mode: VPP input (12–13 V) for byte programming |
| VCC | Power Supply | +5 V supply pin; requires local 0.1 µF ceramic decoupling capacitor placed within 5 mm of pin |
| GND | Ground Reference | Signal and power return; must be connected to system ground plane with low-inductance path |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop, reducing production burn-in cycle time by >5× vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer (0x1E) and device (0x0D) codes readable via A9=12 V and A0 toggle, enabling plug-and-play programmer compatibility |
| Dual-Line Control (CE/OE) | Independent CE and OE inputs allow hierarchical memory mapping and prevent bus contention in multi-chip systems |
| JEDEC-Standard PDIP Package | 28P6 footprint ensures drop-in replacement for legacy 27C512, 27C256, and 27C128 designs without PCB redesign |
| Industrial Temperature Range | –40°C to +85°C operation validated across full speed grade (–15 suffix), supporting deployment in factory automation and motor drives |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic interpreter and I/O driver code in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to CPU address space; provides deterministic 150 ns read latency for real-time scan cycle execution. Use Value: Eliminates reliance on external EEPROM or flash, avoiding wear-out concerns and write-cycle delays during cold start. | Use Scenario: Hosting boot loader and peripheral initialization routines for Z80- or 8085-based instrumentation systems. IC Role / Device Role / Timing Role: Primary read-only program memory; synchronized to CPU clock via CE/OE timing to avoid wait-state insertion. Use Value: Guarantees bit-perfect firmware retention over 20+ years without refresh, critical for medical and test equipment calibration integrity. |
| Automotive ECU Calibration Data | Avionics System Configuration PROM |
Use Scenario: Storing engine map coefficients and sensor offset tables in engine control units operating across –40°C to +85°C ambient. IC Role / Device Role / Timing Role: OTP configuration memory accessed during power-up initialization; immune to accidental overwrite during CAN bus activity. Use Value: Provides tamper-proof calibration data storage with 2,000 V ESD protection, meeting ISO 16750-2 electrical stress requirements. | Use Scenario: Holding flight-critical hardware configuration bits and self-test vectors in airborne navigation computers. IC Role / Device Role / Timing Role: High-reliability PROM used during power-on reset sequence; verified against checksum before system release. Use Value: Delivers radiation-tolerant, latchup-immune (200 mA) operation essential for DO-254 Level A hardware assurance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-15DC | Same 64K×8 organization and 150 ns access, but uses AMD's proprietary programming algorithm and lacks integrated ID code | Requires custom programmer setup; no auto-ID detection; identical PDIP-28 footprint and timing | Select when existing AMD toolchain support is required and ID code functionality is unnecessary |
| MX27C512-15PC | Macronix variant with 150 ns tACC, same VCC and I/O compatibility, but rated only for commercial temp (0°C to 70°C) | Not qualified for industrial environments; unsuitable for extended temperature deployments | Choose only for cost-sensitive, room-temperature applications where industrial qualification is not mandated |
Compared with AM27C512-15DC and MX27C512-15PC, the AT27C512R-15PI uniquely combines industrial temperature rating, Rapid™ programming with integrated ID code, and JEDEC-standard PDIP packaging - making it the only option qualified for long-life, field-deployed embedded systems requiring guaranteed OTP reliability and automated programming validation.
Availability
AT27C512R-15PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and automotive ECU calibration data applications requiring stable component supply and long-term obsolescence management.
Supply support for AT27C512R-15PI 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 product line was engineered for high-reliability, long-lifecycle embedded systems requiring OTP firmware storage with zero risk of accidental reprogramming - targeting industrial control, avionics, and automotive subsystems.
FAQ
What is the maximum operating temperature range for the AT27C512R-15PI?
The AT27C512R-15PI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all AC and DC parameters in the datasheet, including 150 ns access time and 20 mA active current, ensuring reliable performance in factory automation and motor drive environments where ambient temperatures exceed commercial-grade limits.
Does the AT27C512R-15PI require a programming voltage higher than VCC during normal read operation?
No. The AT27C512R-15PI operates from a single 5 V ±10% supply during read mode. The OE/VPP pin functions solely as Output Enable (active-low) in read mode. Programming voltage (12–13 V) is applied only during programming - never during system runtime - eliminating need for onboard high-voltage generation in deployed systems using the AT27C512R-15PI.
Can the AT27C512R-15PI be used as a direct replacement for older AT27C512 devices?
Yes. The AT27C512R-15PI maintains pin-for-pin compatibility, identical timing specifications, and the same 28-lead PDIP package as legacy AT27C512 variants. Its enhanced Rapid™ programming and integrated ID code do not affect read-mode behavior, making it a drop-in upgrade for existing designs using AT27C512-15PC or AT27C512-15JI.
What decoupling capacitance is required for stable operation of the AT27C512R-15PI?
A 0.1 µF high-frequency ceramic capacitor must be placed between VCC and GND, located within 5 mm of the AT27C512R-15PI pins. For systems with multiple AT27C512R-15PI devices, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point to suppress array-level supply ripple and ensure stable read timing across all devices.
How is the Integrated Product Identification Code accessed on the AT27C512R-15PI?
The AT27C512R-15PI ID code is read by applying 12.0 V ±0.5 V to A9 while holding A1–A15 low, then toggling A0: low selects the manufacturer ID (0x1E), high selects the device ID (0x0D). This occurs with CE = VIL and OE/VPP = VIL. No special programming voltage is needed - only the 12 V on A9 - and the code appears on O7–O0 during the next read cycle.
AT27C512R-15PI 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:
- 150 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-PDIP
AT27C512R-15PI FAQ
1.How can I place an order for AT27C512R-15PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-15PI 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-15PI reliable?
The price and inventory of AT27C512R-15PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-15PI is usually 5 days.
3.What payment methods are accepted for AT27C512R-15PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-15PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-15PI?
AT27C512R-15PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-15PI 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-15PI?
For technical support, including AT27C512R-15PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-15PI requirements.
6.How does Aetrix verify that AT27C512R-15PI is sourced from the original manufacturer or authorized distributors?
All AT27C512R-15PI 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-15PI meets industry standards.
7.What is the process for return or replacement of AT27C512R-15PI?
All AT27C512R-15PI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-15PI, 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-15PI part is unused and in its original packaging.
Return procedure for AT27C512R-15PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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