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Microchip Technology AT27C512R-45RU
- Part No.:
- AT27C512R-45RU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27C512R-45RU.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,037
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Product details
Overview
AT27C512R-45RU 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 CMOS/TTL-compatible I/O, dual-line control (CE/OE), and integrated product identification code for automated programming. Used in firmware storage for microprocessor systems requiring non-volatile, low-latency code execution without WAIT states.
For engineers reviewing the AT27C512R-45RU datasheet, AT27C512R-45RU pinout, AT27C512R-45RU application, or AT27C512R-45RU equivalent, this page delivers verified package mapping (28-lead SOIC), JEDEC-compliant timing parameters, rapid programming algorithm details (100 µs/byte), ESD/latchup immunity specs, and real-world system integration guidance including decoupling capacitor requirements.
Technical Context
The AT27C512R-45RU implements a high-reliability OTP EPROM architecture using scaled CMOS technology, enabling fast 45 ns address-to-output delay (tACC) and low active current (20 mA max at 5 MHz). Its two-line control interface (CE and OE/VPP) supports bus contention prevention in multi-device systems.
Programming uses a rapid algorithm with 100 µs CE pulses at VCC = 6.5 V and OE/VPP = 13.0 V, followed by verification loops per byte. The integrated product identification code (Manufacturer ID = 0x1E, Device ID = 0x0D) enables automatic algorithm selection in industry-standard programmers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 64K × 8 bits (524,288-bit capacity); sufficient for boot code or firmware in 8-bit/16-bit microcontrollers. |
| Read Access Time | 45 ns maximum; eliminates WAIT states in high-speed 5 MHz microprocessor buses. |
| Supply Voltage | 5V ±10%; compatible with standard TTL/CMOS logic rails without external regulation. |
| Active Current | 20 mA max at 5 MHz; enables low-power system design with predictable thermal budget. |
| Standby Current | 100 µA max (CMOS mode); reduces quiescent power in sleep-mode embedded systems. |
| ESD Protection | 2,000V HBM; ensures robustness during handling and board assembly. |
| Latchup Immunity | 200 mA; prevents destructive latchup under transient overvoltage conditions. |
Pinout & Package
AT27C512R-45RU is supplied in a 28-lead plastic gull-wing small outline (SOIC) package per JEDEC MS-011AB, 0.330" body width, green (Pb/halide-free) compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; selects one of 64K bytes during read or program cycles. |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; outputs valid data within 45 ns after address/CE/OE stabilization. |
| CE | Chip Enable | Active-low chip select; controls device activation and standby entry; switching requires local 0.1 µF ceramic decoupling. |
| OE/VPP | Output Enable / Program Supply | Dual-function pin: low for read output enable; 13.0 V for programming; must be sequenced with VCC per datasheet timing. |
| VCC | Power Supply | 5V ±10% main supply; must be applied simultaneously with or before OE/VPP to prevent damage. |
| GND | Ground Reference | Signal and power ground return; requires low-inductance connection adjacent to 0.1 µF decoupling capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid Programming Algorithm | 100 µs/byte typical programming time with auto-verification loop; reduces production programming cycle time vs. legacy EPROMs. |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device ID (0x0D) accessible via A9/A0 toggling; enables plug-and-play compatibility with universal programmers. |
| Two-Line Control Interface | Independent CE and OE/VPP pins allow flexible bus arbitration and eliminate need for external gating logic in multi-memory systems. |
| Green Packaging Option | Pb/halide-free SOIC construction meets RoHS Directive 2011/65/EU and JEDEC J-STD-609A Class 1 standards. |
| Industrial Temperature Range | –40°C to +85°C operation; qualified for use in factory automation, industrial controllers, and telecom infrastructure equipment. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O configuration in programmable logic controllers deployed in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 45 ns read latency to initialize CPU and peripherals at power-up. Use Value: Eliminates reliance on slower serial EEPROM or flash; ensures reliable firmware integrity without wear-out mechanisms inherent in reprogrammable media. | Use Scenario: Hosting immutable startup code and interrupt vectors for 8051- or Z80-based embedded systems in medical instrumentation and test equipment. IC Role / Device Role / Timing Role: OTP EPROM acting as primary instruction memory mapped into CPU address space with zero-wait-state timing. Use Value: Guarantees code authenticity and immutability post-production; avoids security risks associated with field-upgradable memory. |
| Automotive Instrument Cluster Calibration Data | Point-of-Sale Terminal BIOS Storage |
Use Scenario: Holding calibrated display parameters and sensor compensation tables in automotive dashboards operating across –40°C to +125°C (using automotive-grade variants). IC Role / Device Role / Timing Role: Read-only data repository accessed during cluster initialization; leverages high ESD (2 kV) and latchup (200 mA) immunity for harsh electrical environments. Use Value: Prevents corruption from load-dump transients or ISO 7637-2 pulses; eliminates need for redundant error-checking circuitry. | Use Scenario: Storing secure boot firmware and cryptographic keys in retail payment terminals where tamper resistance and long-term data retention are critical. IC Role / Device Role / Timing Role: Immutable BIOS memory ensuring trusted execution path; accessed only at power-on reset with strict timing compliance (tOH = 7 ns hold margin). Use Value: Provides hardware-enforced firmware integrity; immune to malware-based overwrite attempts due to one-time programmability. |
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, 28-pin PDIP, 5V operation; no integrated ID code; lower ESD rating (1.5 kV HBM). | Requires external programmer ID detection logic; less suitable for automated high-volume programming lines. | Select when cost-sensitive PDIP packaging is required and ID code functionality is unnecessary. |
| MX27C512PC-45 | 45 ns access, 28-pin PDIP, 5V operation; lacks rapid programming algorithm; typical programming time >1 ms/byte. | Longer production programming cycles; higher risk of incomplete programming due to absence of per-byte verification loop. | Choose only for legacy systems where existing programming infrastructure does not support rapid algorithms. |
Compared with AM27C512-45DC and MX27C512PC-45, the AT27C512R-45RU offers faster programming (100 µs/byte vs. >1 ms), built-in ID code for seamless programmer integration, and superior reliability (2 kV ESD, 200 mA latchup), making it optimal for new industrial designs requiring production efficiency and robustness.
Availability
AT27C512R-45RU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and point-of-sale terminal BIOS storage requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for AT27C512R-45RU 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) is a fabless semiconductor company specializing in microcontrollers, non-volatile memory, and secure authentication ICs.
The AT27C512R-45RU belongs to Atmel's OTP EPROM product line, designed specifically for applications demanding guaranteed firmware immutability, fast read performance, and industrial-grade reliability in space-constrained SOIC packages.
FAQ
What is the maximum operating temperature range for the AT27C512R-45RU?
The AT27C512R-45RU is rated for industrial temperature operation from –40°C to +85°C. This range is validated per the datasheet's Operating Temp. (Case) specification for the -45 speed grade. While automotive-grade variants (e.g., AT27C512R-45RA) extend to +125°C, the AT27C512R-45RU itself is specified strictly for industrial use. Thermal derating is not required within this envelope.
Does the AT27C512R-45RU require a programming voltage higher than VCC during write operations?
Yes, the AT27C512R-45RU requires OE/VPP to be raised to 13.0 V ± 0.25 V during programming, while VCC is simultaneously set to 6.5 V ± 0.25 V. This dual-voltage requirement is mandatory per the DC Programming Characteristics table. Applying 13.0 V to OE/VPP without proper VCC sequencing violates the absolute maximum ratings and may cause permanent damage to the AT27C512R-45RU.
How does the Integrated Product Identification Code function in the AT27C512R-45RU?
The AT27C512R-45RU's Integrated Product Identification Code provides Manufacturer ID (0x1E) and Device ID (0x0D) via dedicated address/data pin behavior. To read it, A9 is driven to 12.0 V (VID), A0 is toggled between low/high, and all other address pins (A1–A15) held low. This feature allows industry-standard programmers to auto-detect the AT27C512R-45RU and select correct algorithms without manual configuration.
Can the AT27C512R-45RU be used in systems with 3.3V logic interfaces?
No, the AT27C512R-45RU is not 3.3V-compatible. Its inputs require VIH ≥ 2.0 V and VIL ≤ 0.8 V, and outputs drive VOH ≥ 2.4 V (at –400 µA) and VOL ≤ 0.4 V (at 2.1 mA), all referenced to a 5V supply. Interfacing directly with 3.3V logic risks violating input voltage limits and causing unreliable operation. Level-shifting circuitry is required for mixed-voltage systems using the AT27C512R-45RU.
What decoupling capacitance is required for stable operation of the AT27C512R-45RU?
The AT27C512R-45RU requires a minimum 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 bulk 4.7 µF electrolytic capacitor should also be added near the power entry point. These values are specified in the System Considerations section to suppress transients caused by CE switching and ensure compliance with absolute maximum voltage ratings on the AT27C512R-45RU.
AT27C512R-45RU 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:
- 45 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-45RU FAQ
1.How can I place an order for AT27C512R-45RU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-45RU 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-45RU reliable?
The price and inventory of AT27C512R-45RU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-45RU is usually 5 days.
3.What payment methods are accepted for AT27C512R-45RU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-45RU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-45RU?
AT27C512R-45RU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-45RU 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-45RU?
For technical support, including AT27C512R-45RU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-45RU requirements.
6.How does Aetrix verify that AT27C512R-45RU is sourced from the original manufacturer or authorized distributors?
All AT27C512R-45RU 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-45RU meets industry standards.
7.What is the process for return or replacement of AT27C512R-45RU?
All AT27C512R-45RU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-45RU, 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-45RU part is unused and in its original packaging.
Return procedure for AT27C512R-45RU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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