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Microchip Technology AT27C512R-70JI
- Part No.:
- AT27C512R-70JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-70JI.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,423
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Product details
Overview
AT27C512R-70JI from Microchip Technology (formerly Atmel) is a 64K × 8-bit one-time programmable EPROM used for non-volatile 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. Its dual-line control (CE/OE) prevents bus contention in memory-mapped designs.
For engineers reviewing the AT27C512R-70JI datasheet, AT27C512R-70JI pinout, AT27C512R-70JI application, or AT27C512R-70JI equivalent, key selection criteria include verified 70 ns tACC timing grade, industrial-grade reliability (200 mA latchup immunity, 2,000V ESD), Rapid™ programming at 100 µs/byte, and JEDEC-standard SOIC packaging compatibility with legacy 27C512 footprints.
Technical Context
The AT27C512R-70JI implements a CMOS-based OTP EPROM architecture with address decoding for A0–A15 and bidirectional data I/O via O0–O7. Its two-control-line interface (CE and OE/VPP) enables flexible bus arbitration and eliminates WAIT states in high-speed 8-bit microprocessor systems.
It uses Atmel's scaled CMOS process to achieve low active current (20 mA max at 5 MHz) and ultra-low standby current (100 µA max), while supporting both TTL- and CMOS-compatible logic levels. The integrated product identification code (Manufacturer ID = 0x1E, Device ID = 0x0D) allows automated programming equipment recognition.
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 MCU systems |
| Read Access Time (tACC) | 70 ns max - guarantees deterministic timing for Z80, 8051, and 68K-family systems without wait-state insertion |
| VCC Supply | 5V ±10% - compatible with standard logic rails; no auxiliary voltage required for read operation |
| Active Current (ICC) | 20 mA max at 5 MHz - enables low-power system design without thermal derating in compact enclosures |
| Standby Current (ISB) | 100 µA max - supports battery-backed or energy-sensitive applications during idle cycles |
| Programming Speed | 100 µs/byte typical (Rapid™ Algorithm) - reduces production programming time vs. legacy 27C512 parts |
| ESD/Latchup | 2,000V HBM ESD protection and 200 mA latchup immunity - ensures robustness in manufacturing and field environments |
Pinout & Package
AT27C512R-70JI is supplied in a 28-lead SOIC (package code "R", JEDEC MS-012) with 0.330" body width and gull-wing leads. Pin 1 is marked by a beveled corner or index notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; latched on CE/OE transitions to select one of 64K bytes |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; high-impedance when CE or OE is high to prevent bus contention |
| CE | Chip Enable | Primary device select; must be low for read or program access; controls power state transition |
| OE/VPP | Output Enable / Programming Voltage | Low = output enable (read); 12–13 V = VPP for programming; dual-function pin reduces PCB routing complexity |
| VCC | Power Supply | +5V supply input; requires local 0.1 µF ceramic decoupling per device per datasheet Section 3 |
| GND | Ground Reference | Signal and power ground return; must be connected to low-impedance plane to maintain noise margin |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time - cuts production burn-in duration by >5× vs. conventional EPROM algorithms |
| Integrated Product ID Code | Manufacturer ID = 0x1E, Device ID = 0x0D - enables auto-detection and algorithm selection in universal programmers |
| Two-Line Control Interface | Independent CE and OE/VPP pins - permits full bus arbitration and eliminates need for external gating logic |
| Industrial Temperature Range | –40°C to +85°C operation - validated for use in factory automation, motor drives, and telecom line cards |
| JEDEC-Standard SOIC Packaging | 28-lead, 0.330" wide SOIC (package code R) - drop-in replacement for legacy 27C512 SOIC variants without layout change |
Applications
| Industrial PLC Firmware Storage | Legacy 8-bit Microcontroller Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic and I/O mapping tables in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 70 ns read access to initialize CPU and peripherals at power-up. Use Value: Eliminates reliance on external EEPROM or flash; avoids firmware corruption risks from power loss during writes. |
Use Scenario: Hosting startup code and interrupt vectors for Z80- or 8051-based instrumentation front-ends. IC Role / Device Role / Timing Role: Read-only instruction/data memory mapped into upper address space with no wait states required. Use Value: Guarantees sub-100 ns instruction fetch latency critical for real-time analog sampling control loops. |
| Telecom Line Card Configuration | Automated Test Equipment (ATE) Pattern Memory |
|
Use Scenario: Holding calibration constants and protocol stack parameters in T1/E1 framing modules. IC Role / Device Role / Timing Role: Static configuration store accessed during initialization; not modified in field operation. Use Value: Provides tamper-proof, radiation-tolerant storage immune to bit flips - unlike SRAM or flash under EMI stress. |
Use Scenario: Storing fixed digital test patterns for semiconductor wafer probing systems. IC Role / Device Role / Timing Role: High-reliability pattern buffer delivering synchronized 8-bit parallel data at 10+ MHz clock rates. Use Value: Enables deterministic pattern replay with zero read latency variation - essential for nanosecond-level timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-70JC | Same die, commercial temp range (0°C to 70°C); PDIP package; no industrial qualification testing | Restricted to lab, benchtop, or non-temperature-critical consumer systems | Select only if ambient operating temperature remains within 0–70°C and through-hole assembly is preferred. |
| MX27C512PC-70 | Macronix second-source; identical 64K×8 organization, 70 ns speed grade, and SOIC-28 footprint but lacks Integrated Product ID Code | Requires manual programmer setup; no auto-ID support; lower ESD rating (1,500V HBM) | Use where cost sensitivity outweighs programming automation needs and ESD robustness is secondary. |
Compared with AT27C512R-70JI, AT27C512-70JC sacrifices industrial temperature capability and surface-mount compatibility, while MX27C512PC-70 trades off programmability convenience and ESD resilience for lower unit cost - making AT27C512R-70JI the optimal choice for ruggedized, automated-production embedded systems.
Availability
AT27C512R-70JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy 8-bit microcontroller boot ROM, and telecom line card configuration requiring stable component supply across extended lifecycle programs.
Supply support for AT27C512R-70JI 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 the legacy AT27C series. The company specializes in microcontrollers, memory, and analog semiconductors for industrial, automotive, and communications markets.
The AT27C512R product line was designed to provide pin- and function-compatible OTP EPROM replacements for aging 27C512-based systems, emphasizing reliability, JEDEC packaging compliance, and rapid programming in industrial environments.
FAQ
What is the maximum operating temperature range for the AT27C512R-70JI?
The AT27C512R-70JI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per the ordering information table on page 9 of the official datasheet, where the suffix "I" explicitly denotes the industrial grade. Operation outside this range may result in parametric non-conformance or accelerated wear-out.
Does the AT27C512R-70JI require a programming voltage during normal read operation?
No, the AT27C512R-70JI requires only a single 5V ±10% supply for read mode. The OE/VPP pin functions solely as Output Enable (low) during reads; programming voltage (12–13 V) is applied only during the programming cycle and is not present in standard system operation. This simplifies power design and eliminates risk of accidental reprogramming.
Is the AT27C512R-70JI pin-compatible with earlier AT27C512 variants in SOIC packages?
Yes, the AT27C512R-70JI uses the same 28-lead SOIC package (package code "R") and identical pinout as AT27C512-70RC and AT27C512R-70RC. All signal names (A0–A15, O0–O7, CE, OE/VPP, VCC, GND) and physical pin locations match exactly - enabling direct replacement without PCB modification.
What is the purpose of the Integrated Product Identification Code in the AT27C512R-70JI?
The AT27C512R-70JI embeds a Manufacturer ID (0x1E) and Device ID (0x0D) accessible via A9 and A0 during special read mode. This code allows industry-standard programmers to auto-detect the part and load correct programming algorithms and voltage profiles - reducing setup errors and improving first-pass yield in high-volume manufacturing.
Can the AT27C512R-70JI be used in place of a UV-erasable 27C512 EPROM?
Yes, the AT27C512R-70JI is a one-time programmable (OTP) replacement for UV-erasable 27C512 EPROMs. It shares identical organization (64K × 8), pinout, timing, and interface logic - but eliminates the quartz window and UV erasure step. Programming is electrical only, and data retention exceeds 10 years per datasheet specification.
AT27C512R-70JI 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 ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27C512R-70JI FAQ
1.How can I place an order for AT27C512R-70JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-70JI 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-70JI reliable?
The price and inventory of AT27C512R-70JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-70JI is usually 5 days.
3.What payment methods are accepted for AT27C512R-70JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-70JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-70JI?
AT27C512R-70JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-70JI 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-70JI?
For technical support, including AT27C512R-70JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-70JI requirements.
6.How does Aetrix verify that AT27C512R-70JI is sourced from the original manufacturer or authorized distributors?
All AT27C512R-70JI 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-70JI meets industry standards.
7.What is the process for return or replacement of AT27C512R-70JI?
All AT27C512R-70JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-70JI, 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-70JI part is unused and in its original packaging.
Return procedure for AT27C512R-70JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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