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Microchip Technology AT27C512R-45JI
- Part No.:
- AT27C512R-45JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-45JI.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT27C512R-45JI from Microchip Technology (formerly Atmel) is a 512 Kbit (64K × 8) one-time programmable EPROM designed for firmware storage in embedded microprocessor systems. It delivers 45 ns read access time, operates from a single 5V ±10% supply, and supports industrial temperature range (–40°C to +85°C) in a 28-lead SOIC package. Used where non-volatile, pin-compatible ROM replacement is required without battery backup or reprogramming capability.
For engineers reviewing the AT27C512R-45JI datasheet, AT27C512R-45JI pinout, AT27C512R-45JI application, or AT27C512R-45JI equivalent, this page provides verified technical context, JEDEC-standard package mapping, rapid programming timing, CMOS/TTL I/O compatibility, and industrial-grade reliability metrics including 2,000V ESD protection and 200 mA latchup immunity.
Technical Context
The AT27C512R-45JI implements a two-line control architecture using Chip Enable (CE) and Output Enable/VPP pins to manage bus contention and support both read and programming modes. Its Rapid™ Programming Algorithm enables 100 µs/byte typical programming with verification loops and VPP = 13.0 V during write cycles.
It features integrated product identification code accessible via A9 high-voltage (11.5–12.5 V) and A0 toggling, allowing automatic device recognition by industry-standard programmers. The device uses scaled CMOS technology to achieve 8 mA typical active current at 5 MHz and <10 µA standby current, with pin capacitance of 4–6 pF (input) and 8–12 pF (output).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288-bit / 64K × 8 organization - supports full-byte addressing for firmware image storage without bank switching. |
| Read Access Time | 45 ns max - eliminates WAIT states on 5 MHz+ microprocessor buses such as 80C51 or Z80 derivatives. |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read operation. |
| Active Current | 20 mA max at 5 MHz - enables low-power system design with predictable dynamic loading. |
| Standby Current | 100 µA max - reduces quiescent power in always-on industrial controllers during idle periods. |
| ESD Protection | 2,000V HBM - ensures robustness during handling and PCB assembly in uncontrolled environments. |
| Latchup Immunity | 200 mA - prevents destructive latchup under transient overvoltage or ground bounce conditions. |
Pinout & Package
AT27C512R-45JI is supplied in a 28-lead, 0.330" wide plastic gull-wing small outline (SOIC) package per JEDEC MS-012 standard, with 1.27 mm pitch and surface-mount compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; selects one of 65,536 bytes; TTL/CMOS compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V). |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus outputs; drive capability: VOL ≤ 0.4 V @ 2.1 mA, VOH ≥ 2.4 V @ –400 µA. |
| CE | Chip Enable | Active-low chip select; controls device enable/disable; used with OE/VPP to enter Standby (VIH) or Read (VIL). |
| OE/VPP | Output Enable / Programming Voltage | Dual-function pin: VIL enables output buffer during read; 13.0 V applied for programming; requires simultaneous VCC sequencing. |
| VCC | Power Supply | +5V ±10% main supply; must be applied before/with OE/VPP and removed after/with OE/VPP to prevent latchup. |
| GND | Ground Reference | Signal and power return; requires local 0.1 µF ceramic decoupling capacitor placed adjacent to pin. |
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 ID Code | Manufacturer ID (0x1E) and Device Code (0x0D) readable via A9=12V and A0 toggle - enables automated programmer setup without manual part selection. |
| Two-Line Control Architecture | Independent CE and OE/VPP inputs - allows flexible bus arbitration and eliminates need for external gating logic in multi-device systems. |
| Industrial Temperature Range | –40°C to +85°C operation - qualified for use in motor drives, PLC modules, and factory automation equipment without derating. |
| JEDEC-Standard Packaging | 28-lead SOIC (28R), PDIP (28P6), PLCC (32J), TSOP (28T) options - ensures board-level interchangeability across legacy and new designs. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O configuration in DIN-rail mounted programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 45 ns instruction fetch timing to 8051-based CPU cores. Use Value: Eliminates reliance on external EEPROM or Flash with wear-out concerns; maintains firmware integrity across 10+ year deployments without refresh. |
Use Scenario: Hosting immutable startup code and hardware initialization routines for Z80 or 68000-based instrumentation systems deployed in field service equipment. IC Role / Device Role / Timing Role: Primary read-only memory mapped at address 0x0000; accessed synchronously with CPU clock via CE/OE-controlled bus enable. Use Value: Guarantees zero-latency execution of critical boot sequence; avoids timing uncertainty introduced by serial or page-mode memory interfaces. |
| Automotive Body Control Module ROM | Medical Device Calibration Data Storage |
Use Scenario: Holding vehicle-specific configuration tables and CAN message routing logic in body control units certified for automotive (-40°C to +125°C) variants (e.g., AT27C512R-45JA). IC Role / Device Role / Timing Role: OTP firmware repository accessed during cold start; immune to radiation-induced bit flips common in EEPROM. Use Value: Meets AEC-Q100 stress test requirements for data retention over 20 years; no risk of accidental overwrite during ECU reset sequences. |
Use Scenario: Storing factory-calibrated sensor offset/gain coefficients and safety-critical diagnostic lookup tables in Class II medical analyzers requiring regulatory traceability. IC Role / Device Role / Timing Role: Secure, tamper-proof calibration memory mapped into microcontroller address space; accessed only during power-up self-test. Use Value: Provides immutable audit trail for FDA 21 CFR Part 11 compliance; eliminates need for cryptographic signature verification of volatile memory contents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-45DC | 45 ns access, 5V supply, same 64K×8 organization but manufactured by AMD; requires identical 13V VPP for programming. | Identical pinout and timing; validated in same Atmel-programmer toolchains but lacks integrated ID code. | Select when sourcing continuity is prioritized over automated programmer ID detection. |
| MX27C512-45PC | 45 ns access, 5V supply, 64K×8 OTP EPROM from Macronix; supports same JEDEC packages but specifies 12V VPP (±0.5V) instead of 13V. | Requires minor programmer voltage adjustment; otherwise drop-in compatible in read mode and layout. | Select when cost sensitivity outweighs need for Atmel-specific Rapid™ algorithm optimization. |
Compared with AM27C512-45DC and MX27C512-45PC, the AT27C512R-45JI offers faster programming via its proprietary Rapid™ algorithm and built-in ID code for seamless toolchain integration, while maintaining identical read timing, voltage tolerances, and industrial temperature qualification.
Availability
AT27C512R-45JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, automotive body control module ROM, and medical device calibration data storage requiring stable component supply across extended lifecycle programs.
Supply support for AT27C512R-45JI 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 continues to manufacture, qualify, and support the AT27C512R family under its legacy product portfolio.
The AT27C512R series was designed specifically for high-reliability, non-volatile firmware storage in industrial and automotive systems where data integrity, long-term retention, and immunity to accidental reprogramming are mandatory.
FAQ
What is the maximum programming voltage required for AT27C512R-45JI?
The AT27C512R-45JI requires OE/VPP = 13.0 V ± 0.25 V during programming operations, as specified in the DC Programming Characteristics table. This voltage must be applied simultaneously with or after VCC and removed simultaneously with or before VCC to prevent latchup. The AT27C512R-45JI does not support programming at lower voltages; applying less than 12.5 V or more than 13.5 V risks incomplete programming or device damage.
Can AT27C512R-45JI be used as a direct replacement for older AT27C512 versions?
Yes, the AT27C512R-45JI is backward compatible with earlier AT27C512 variants in read mode, sharing identical pinout, timing, and electrical specifications. However, the "R" suffix denotes enhanced reliability features including 2,000V ESD protection and improved latchup immunity. The AT27C512R-45JI retains full functional equivalence while offering higher robustness in electrically noisy environments.
Does AT27C512R-45JI support automatic device identification during programming?
Yes, the AT27C512R-45JI includes an Integrated Product Identification Code that outputs Manufacturer ID (0x1E) and Device Code (0x0D) when A9 is driven to 11.5–12.5 V and A0 is toggled. This feature allows compliant programmers to auto-detect the AT27C512R-45JI and select correct algorithms without manual part selection - a capability not present in pre-R revision devices.
What decoupling capacitors are required for stable operation of AT27C512R-45JI?
The AT27C512R-45JI requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND as close as possible to the device pins, plus a 4.7 µF bulk electrolytic capacitor near the power entry point for arrays. These values are mandated in the System Considerations section to suppress transients caused by CE switching and ensure VCC remains within specification during active-to-standby transitions.
Is AT27C512R-45JI qualified for automotive applications?
No - the AT27C512R-45JI is rated for industrial temperature range (–40°C to +85°C). For automotive use, Microchip offers the AT27C512R-45JA variant, which is qualified to –40°C to +125°C and meets AEC-Q100 stress testing requirements. The AT27C512R-45JI should not be deployed in under-hood or other automotive environments exceeding +85°C ambient.
AT27C512R-45JI 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:
- 45 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27C512R-45JI FAQ
1.How can I place an order for AT27C512R-45JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-45JI 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-45JI reliable?
The price and inventory of AT27C512R-45JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-45JI is usually 5 days.
3.What payment methods are accepted for AT27C512R-45JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-45JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-45JI?
AT27C512R-45JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-45JI 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-45JI?
For technical support, including AT27C512R-45JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-45JI requirements.
6.How does Aetrix verify that AT27C512R-45JI is sourced from the original manufacturer or authorized distributors?
All AT27C512R-45JI 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-45JI meets industry standards.
7.What is the process for return or replacement of AT27C512R-45JI?
All AT27C512R-45JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-45JI, 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-45JI part is unused and in its original packaging.
Return procedure for AT27C512R-45JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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