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Microchip Technology AT27C512R-70RI
- Part No.:
- AT27C512R-70RI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27C512R-70RI.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,779
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Product details
Overview
AT27C512R-70RI from Microchip Technology (formerly Atmel) is a 512 Kbit (64K × 8) one-time programmable EPROM used for non-volatile firmware storage in embedded microcontroller systems. It features 45 ns read access time, 5V ±10% single-supply operation, and industrial temperature range (–40°C to +85°C), enabling reliable boot code retention in PLCs, industrial controllers, and legacy instrumentation.
For engineers reviewing the AT27C512R-70RI datasheet, AT27C512R-70RI pinout, AT27C512R-70RI application, or AT27C512R-70RI equivalent, key selection criteria include verified 70 ns tACC timing grade, SOIC-28/PLCC-32/PDIP-28 package compatibility, OTP programming voltage requirements (VPP = 13.0 V), and CMOS/TTL I/O interface compliance.
Technical Context
The AT27C512R-70RI implements a two-line control architecture with Chip Enable (CE) and Output Enable/VPP (OE/VPP), supporting both read mode (OE/VPP = VIL) and rapid programming mode (OE/VPP = 13.0 V). Its address decoding covers A0–A15 for full 64K-byte access, with outputs O0–O7 directly driving data buses without external latching.
It uses scaled CMOS technology with 2,000V ESD protection and 200 mA latchup immunity, ensuring robustness in noisy industrial environments. The Rapid™ Programming Algorithm enables 100 µs/byte typical programming time, verified via CE pulse width control and on-chip product identification code (Manufacturer ID = 0x1E, Device ID = 0x0D).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8), sufficient for full boot ROM or configuration tables in 8-bit MCU systems |
| Read Access Time (tACC) | 70 ns max - guarantees no WAIT states required on 14 MHz Z80 or 8051-based systems |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead |
| Active Current (ICC) | 20 mA max at 5 MHz - enables low-power operation in battery-backed or energy-constrained designs |
| Standby Current (ISB) | 100 µA max (CMOS CE mode) - supports ultra-low quiescent power in sleep-mode systems |
| Programming Voltage (VPP) | 13.0 V ±0.25 V - requires dedicated high-voltage supply during OTP write, not during normal read |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade reliability per JEDEC JESD22-A108 |
Pinout & Package
AT27C512R-70RI is packaged in 28-lead SOIC (package code "R"), with 300-mil body width and gull-wing leads. Pin 1 is marked by a beveled corner or index notch; pin 14 is GND, pin 28 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit parallel address bus; fully decoded to select one of 65,536 bytes |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-impedance when CE or OE/VPP inactive |
| CE | Chip Enable | Active-low global enable; must be asserted before OE/VPP to prevent bus contention |
| OE/VPP | Output Enable / Programming Voltage | Low during read; 13.0 V during programming; dual-function pin requiring voltage-level switching |
| GND | Ground Reference | Pin 14 - primary return path for VCC and I/O currents; requires local 0.1 µF ceramic decoupling |
| VCC | Power Supply | Pin 28 - 5V ±10% supply; must be applied simultaneously with or before OE/VPP per datasheet note |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical - reduces firmware update cycle time by >90% vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer ID = 0x1E, Device ID = 0x0D - enables automated programmer validation and BOM traceability |
| Two-Line Control (CE + OE/VPP) | Eliminates need for address strobes or additional control logic in simple memory-mapped systems |
| JEDEC-Standard Packages | SOIC-28, PLCC-32, PDIP-28, TSOP-28 - ensures drop-in replacement across legacy board revisions |
| High-Reliability CMOS | 2,000V HBM ESD rating and 200 mA latchup immunity - meets industrial IEC 61000-4-2 Level 4 requirements |
Applications
| Industrial PLC Firmware Storage | Legacy Medical Instrument Boot ROM |
|---|---|
Use Scenario: Storing fixed control logic and calibration tables in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Non-volatile boot memory mapped to CPU address space; accessed during power-on reset sequence. Use Value: 70 ns tACC eliminates WAIT state insertion, maintaining deterministic 14 MHz bus timing without clock stretching. |
Use Scenario: Holding diagnostic firmware and safety-critical initialization routines in Class II medical analyzers. IC Role / Device Role / Timing Role: OTP EPROM providing tamper-resistant, unalterable startup code executed before RAM initialization. Use Value: Industrial temperature range (–40°C to +85°C) and 200 mA latchup immunity ensure continuous operation in thermally unstable lab environments. |
| Automotive ECU Configuration Memory | Avionics Display System Character ROM |
Use Scenario: Storing vehicle-specific calibration maps and CAN message routing tables in engine control units. IC Role / Device Role / Timing Role: Read-only configuration store accessed during cold start; isolated from volatile RAM and flash wear cycles. Use Value: 5V ±10% supply tolerance matches automotive battery rail fluctuations; 100 µA standby current minimizes parasitic drain. |
Use Scenario: Providing ASCII glyph definitions and screen layout templates for cockpit display processors. IC Role / Device Role / Timing Role: Dedicated character generator ROM interfaced via parallel bus to display controller ASIC. Use Value: SOIC-28 package allows direct replacement of obsolete 27C512 variants on existing avionics PCBs without layout change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-70PI | Same 70 ns speed grade and industrial temp range, but lacks Rapid™ programming algorithm and integrated ID code | Requires longer programming time (≥500 µs/byte); no electronic device identification for automated programming | Select only if cost sensitivity outweighs programming throughput and traceability needs |
| MX27C512-70PC | Pin-compatible 512K OTP EPROM; 70 ns tACC, 5V supply, but rated only for commercial temp (0°C to 70°C) | Not qualified for industrial or automotive thermal cycling; lower ESD rating (1,500V) | Acceptable only in benign indoor environments with stable ambient temperature |
Compared with AT27C512R-70RI, AT27C512-70PI sacrifices programming speed and ID verification for lower unit cost, while MX27C512-70PC trades industrial qualification for reduced procurement lead time - neither offers the combined reliability, programmability, and traceability of the R-suffix variant.
Availability
AT27C512R-70RI is available at Aetrix Electronics and suitable for industrial automation, legacy medical equipment, and aerospace display systems requiring stable component supply and long-term obsolescence management.
Supply support for AT27C512R-70RI 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 technical and manufacturing continuity for the AT27C512R family. The company specializes in secure, reliable microcontrollers and non-volatile memory solutions.
The AT27C512R belongs to Atmel's legacy OTP EPROM product line, designed specifically for firmware storage in resource-constrained, long-lifecycle embedded systems where data integrity and program permanence are critical.
FAQ
What is the maximum operating temperature range for the AT27C512R-70RI?
The AT27C512R-70RI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per JEDEC JESD22-A104 and confirmed in the official Microchip datasheet revision 0015I–07/98. The AT27C512R-70RI maintains full electrical performance across this range, including guaranteed 70 ns read access time and 100 µA standby current. It is not rated for automotive (–40°C to +125°C) or extended industrial ranges.
Does the AT27C512R-70RI require a separate programming voltage during normal read operation?
No, the AT27C512R-70RI operates on a single 5V ±10% supply during read mode. The VPP function on the OE/VPP pin is active only during programming (requiring 13.0 V ±0.25 V), and the pin serves as standard Output Enable (OE) at VIL during read. The AT27C512R-70RI datasheet explicitly states that VCC must be applied simultaneously with or before OE/VPP, confirming safe 5V-only read operation without high-voltage risk.
Can the AT27C512R-70RI be used as a direct replacement for older AT27C512 devices?
The AT27C512R-70RI is pin- and function-compatible with earlier AT27C512 variants in SOIC-28, PDIP-28, PLCC-32, and TSOP-28 packages, but adds Rapid™ programming and integrated ID code. Electrical parameters (tACC, ICC, ISB) match or exceed legacy versions. The AT27C512R-70RI requires no PCB changes, though programming equipment must support the 100 µs CE pulse and ID code verification protocol.
What decoupling capacitance is required for stable operation of the AT27C512R-70RI?
The AT27C512R-70RI requires a minimum 0.1 µF high-frequency ceramic capacitor between VCC (pin 28) and GND (pin 14), placed as close to the device as possible. For systems with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor should also be added near the array's power entry point. These values are specified in the "System Considerations" section of the AT27C512R-70RI datasheet to suppress transient excursions during CE transitions.
How is the Integrated Product Identification Code accessed on the AT27C512R-70RI?
The AT27C512R-70RI ID code is read by holding all address lines A1–A15 low, setting A9 to 12.0 V ±0.5 V (VID), and toggling A0 between VIL and VIH to select Manufacturer ID (A0 = VIL → 0x1E) or Device ID (A0 = VIH → 0x0D). This occurs during a special read cycle with CE = VIL and OE/VPP = VIL. The AT27C512R-70RI datasheet confirms this method is electrically identical across all R-suffix variants.
AT27C512R-70RI 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:
- 70 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-70RI FAQ
1.How can I place an order for AT27C512R-70RI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-70RI 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-70RI reliable?
The price and inventory of AT27C512R-70RI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-70RI is usually 5 days.
3.What payment methods are accepted for AT27C512R-70RI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-70RI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-70RI?
AT27C512R-70RI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-70RI 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-70RI?
For technical support, including AT27C512R-70RI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-70RI requirements.
6.How does Aetrix verify that AT27C512R-70RI is sourced from the original manufacturer or authorized distributors?
All AT27C512R-70RI 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-70RI meets industry standards.
7.What is the process for return or replacement of AT27C512R-70RI?
All AT27C512R-70RI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-70RI, 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-70RI part is unused and in its original packaging.
Return procedure for AT27C512R-70RI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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