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Microchip Technology AT27C512R-70RU
- Part No.:
- AT27C512R-70RU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27C512R-70RU.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,432
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Product details
Overview
AT27C512R-70RU from Atmel is a 64K × 8-bit one-time programmable EPROM (OTP EPROM) with 45 ns read access time, 5V ±10% supply operation, and industrial temperature range (–40°C to +85°C). It features dual-line control (CE/OE), CMOS/TTL-compatible I/O, and rapid programming at 100 µs/byte - enabling firmware storage in microprocessor systems without wait states.
For engineers reviewing the AT27C512R-70RU datasheet, AT27C512R-70RU pinout, AT27C512R-70RU application, or AT27C512R-70RU equivalent, this page delivers verified package mapping (28-lead SOIC), JEDEC-compliant timing parameters, OTP programming voltage requirements (13.0 V on OE/VPP), and real-world system integration guidance for embedded firmware storage.
Technical Context
The AT27C512R-70RU implements a parallel-addressed OTP EPROM architecture with 16 address inputs (A0–A15) and 8 bidirectional data outputs (O0–O7), controlled by CE (chip enable) and OE/VPP (output enable/programming supply). Its two-mode operation-read mode (5V only) and rapid program mode (6.5V VCC + 13.0V OE/VPP)-enables reliable field programming without external high-voltage generators.
It uses scaled CMOS technology delivering 100 µA max standby current and 20 mA max active current at 5 MHz, with integrated product identification code (0x1E manufacturer ID, 0x0D device ID) for automated programmer recognition. ESD protection exceeds 2,000V and latchup immunity reaches 200 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64K × 8 bits (524,288-bit OTP EPROM) |
| Read Access Time | 70 ns max (tACC), enabling direct interface with 14 MHz+ microprocessors |
| Supply Voltage | 5V ±10%; no auxiliary voltages required in read mode |
| Operating Temperature | –40°C to +85°C (industrial grade), validated per JEDEC JESD22-A108 |
| Programming Voltage | OE/VPP = 13.0 V ±0.25 V during programming; VCC = 6.5 V ±0.25 V |
| Standby Current | ≤100 µA (CMOS CE mode), critical for low-power firmware retention |
| Output Drive | VOL ≤0.4 V @ 2.1 mA; VOH ≥2.4 V @ –400 µA - ensures TTL/CMOS bus compatibility |
Pinout & Package
AT27C512R-70RU is supplied in a 28-lead plastic gull-wing small outline (SOIC) package (JEDEC MO-049AA, package code 28R), 0.330" body width, RoHS-compliant and halide-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; A9 used as VID select during product ID read |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; high-impedance when CE or OE high |
| CE | Chip Enable | Active-low chip select; controls device activation and power state transition |
| OE/VPP | Output Enable / Programming Supply | Low = output enable (read); 13 V = programming mode trigger |
| VCC | Power Supply | 5V ±10% for read; 6.5V ±0.25V for programming |
| GND | Ground Reference | Common return path for logic and power; decoupling capacitor required (0.1 µF ceramic) |
Key Features
| Feature | Design Value |
|---|---|
| Rapid Programming Algorithm | 100 µs/byte typical; includes auto-verify loop with up to 10 pulses per byte for guaranteed write integrity |
| Integrated Product ID Code | Manufacturer ID = 0x1E, Device ID = 0x0D; enables automatic algorithm selection in production programmers |
| Dual-Voltage Operation | Single 5V supply for read; no external HV generator needed - OE/VPP doubles as programming voltage input |
| JEDEC-Standard Packaging | 28-lead SOIC (28R) footprint compatible with industry-standard PCB layouts and reflow profiles |
| High-Reliability Process | 2,000V HBM ESD rating and 200 mA latchup immunity support robust industrial deployment |
Applications
| Firmware Boot Storage | Industrial Control Logic |
|---|---|
Use Scenario: Storing boot code for 8/16-bit microcontrollers in factory automation PLCs where firmware must survive power cycles and environmental stress. IC Role / Device Role / Timing Role: Nonvolatile firmware repository accessed at power-up via parallel address/data bus; tACC ≤70 ns eliminates wait-state insertion. Use Value: Eliminates reliance on slower serial EEPROM or external flash, reducing BOM count and boot latency in deterministic real-time systems. | Use Scenario: Holding configuration tables and motion-control algorithms in CNC machine controllers operating continuously in dusty, thermally variable environments. IC Role / Device Role / Timing Role: OTP memory mapped into microcontroller address space; CE/OE dual-control prevents bus contention during multi-device sharing. Use Value: Immune to accidental overwrite; supports long-term reliability without battery backup or wear-leveling management overhead. |
| Automotive Instrument Cluster | Medical Diagnostic Equipment |
Use Scenario: Storing calibrated display fonts and gauge scaling constants in automotive dashboards qualified for –40°C to +125°C operation (via AT27C512R-70RA variant). IC Role / Device Role / Timing Role: Read-only memory accessed during startup sequence; OE/VPP pin repurposed only during factory programming, not runtime. Use Value: Guarantees data integrity across vehicle lifetime; green (Pb/halide-free) packaging meets automotive RoHS compliance requirements. | Use Scenario: Storing FDA-cleared calibration coefficients and safety-critical diagnostic routines in portable ultrasound units requiring traceable, unalterable firmware. IC Role / Device Role / Timing Role: OTP EPROM used as immutable golden reference memory; integrated ID code enables audit-ready programming log verification. Use Value: Meets IEC 62304 software lifecycle requirements for Class B devices by eliminating runtime write capability and ensuring version traceability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-70PU | Same die, same speed grade (70 ns), identical programming specs; differs only in green (Pb/halide-free) packaging and SOIC lead finish | No functional difference; both rated for industrial temp; AT27C512R-70RU uses matte tin, AT27C512-70PU uses SnAgCu | Select AT27C512R-70RU for legacy board compatibility; AT27C512-70PU for newer RoHS-2 compliant assemblies requiring SAC305 solder paste. |
| MX27C512PC-70 | 5V OTP EPROM, 70 ns access, but requires separate VPP pin (not shared with OE); no integrated product ID code | Lacks auto-ID feature - requires manual algorithm selection in programmers; different pinout (VPP ≠ OE) | Use MX27C512PC-70 only if existing tooling lacks OE/VPP voltage switching capability; not drop-in compatible due to pin function mismatch. |
Compared with AT27C512R-70RU, AT27C512-70PU offers identical electrical behavior with updated solderability, while MX27C512PC-70 demands PCB layout changes and manual programming setup - making AT27C512R-70RU the optimal choice for new designs requiring integrated ID and OE/VPP dual-function simplicity.
Availability
AT27C512R-70RU is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and automotive instrument clusters requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AT27C512R-70RU 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
Atmel Corporation (now part of Microchip Technology) designed high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and communications markets before its 2016 acquisition.
The AT27C512R belongs to Atmel's OTP EPROM product line, engineered specifically for firmware storage in resource-constrained embedded systems where data immutability, fast parallel access, and programming simplicity are essential.
FAQ
What is the maximum programming voltage required for AT27C512R-70RU?
The AT27C512R-70RU requires OE/VPP = 13.0 V ±0.25 V during programming, with VCC simultaneously set to 6.5 V ±0.25 V. These voltages must be applied and removed in strict sequence: VCC before OE/VPP during power-up, and OE/VPP before VCC during power-down. This sequencing prevents latchup and ensures reliable byte programming across the full 64K address space.
Does AT27C512R-70RU support read operations at 5V only?
Yes, AT27C512R-70RU operates fully in read mode using only a single 5V ±10% supply - no auxiliary voltages are needed. All DC and AC timing specifications (including tACC ≤70 ns and ICC ≤20 mA at 5 MHz) are guaranteed under this condition. The OE/VPP pin functions solely as output enable (active-low) during read, eliminating complexity in power rail design.
How does the Integrated Product Identification Code work on AT27C512R-70RU?
The AT27C512R-70RU embeds a two-byte ID code: Manufacturer ID = 0x1E and Device ID = 0x0D. To read it, hold A1–A15 low, apply VID = 12.0 V ±0.5 V to A9, and toggle A0 between low (reads manufacturer byte) and high (reads device byte). This feature enables automatic algorithm selection in commercial programmers like BP Microsystems and Xeltek.
Is AT27C512R-70RU pin-compatible with other 28-pin SOIC EPROMs?
AT27C512R-70RU follows JEDEC-standard 28-lead SOIC pinout (package code 28R) and is functionally pin-compatible with industry-standard 64K×8 OTP EPROMs such as the AT27C512-70PU and 27C512 variants - provided OE/VPP handling and programming voltage sequencing are maintained. However, it is not pin-compatible with devices assigning VPP to a dedicated pin (e.g., MX27C512), due to OE/VPP dual-function assignment.
What decoupling capacitance is required for stable operation of AT27C512R-70RU?
Each AT27C512R-70RU requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins. For systems with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor must also be added near the main power entry point. These values are specified in Atmel's System Considerations section to suppress transient excursions during CE-driven standby-to-active transitions.
AT27C512R-70RU 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-70RU FAQ
1.How can I place an order for AT27C512R-70RU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-70RU 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-70RU reliable?
The price and inventory of AT27C512R-70RU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-70RU is usually 5 days.
3.What payment methods are accepted for AT27C512R-70RU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-70RU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-70RU?
AT27C512R-70RU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-70RU 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-70RU?
For technical support, including AT27C512R-70RU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-70RU requirements.
6.How does Aetrix verify that AT27C512R-70RU is sourced from the original manufacturer or authorized distributors?
All AT27C512R-70RU 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-70RU meets industry standards.
7.What is the process for return or replacement of AT27C512R-70RU?
All AT27C512R-70RU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-70RU, 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-70RU part is unused and in its original packaging.
Return procedure for AT27C512R-70RU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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