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Microchip Technology AT27C512R-45PC
- Part No.:
- AT27C512R-45PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C512R-45PC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,345
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Product details
Overview
AT27C512R-45PC from Atmel is a 64K × 8-bit one-time programmable EPROM (OTP EPROM) with 45 ns read access time, 5V ±10% supply operation, and JEDEC-standard 28-lead PDIP packaging. It delivers low-power CMOS performance (≤100 µA standby, ≤20 mA active at 5 MHz) for firmware storage in microprocessor-based embedded control systems.
For engineers reviewing the AT27C512R-45PC datasheet, AT27C512R-45PC pinout, AT27C512R-45PC application, or AT27C512R-45PC equivalent, key selection criteria include verified 45 ns tACC timing, VPP-enabled programming compatibility, dual-line CE/OE control architecture, and industrial temperature range support (-40°C to +85°C).
Technical Context
The AT27C512R-45PC implements a standard OTP EPROM architecture with address decoding for A0–A15, eight bidirectional data outputs (O0–O7), and dual-control logic using Chip Enable (CE) and Output Enable/VPP (OE/VPP). Its Rapid™ Programming Algorithm enables 100 µs/byte typical programming at 13.0 V VPP and 6.5 V VCC.
It features integrated product identification (Manufacturer ID = 0x1E, Device ID = 0x0D) accessed via A9 high-voltage mode and supports CMOS/TTL-compatible I/O levels (VIL ≤ 0.8 V, VIH ≥ 2.0 V, VOL ≤ 0.4 V, VOH ≥ 2.4 V) across commercial and industrial temperature grades.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288-bit (64K × 8) OTP EPROM - fixed firmware storage without re-erasure capability |
| Read Access Time | 45 ns max (tACC) - eliminates WAIT states in 5 MHz Z80, 8051, and 68K-based systems |
| Supply Voltage | 5V ±10% - single-rail operation compatible with legacy 5V logic families |
| Standby Current | ≤100 µA - enables low-power retention in battery-backed or intermittent-use applications |
| Active Current | ≤20 mA at 5 MHz - supports sustained read throughput without thermal derating |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires dedicated programmer with high-voltage OE/VPP control |
| ESD Protection | 2,000 V HBM - ensures robust handling during board assembly and field service |
Pinout & Package
AT27C512R-45PC is supplied in a 28-lead, 0.600-inch wide plastic dual-inline package (PDIP), per JEDEC MS-011 AB standard. Pin 1 is index-marked; pins are numbered counter-clockwise from top-left corner when viewed from top with notch or dot oriented left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; latched on CE falling edge for memory location selection |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; high-impedance when CE or OE/VPP is high |
| CE | Chip Enable | Active-low chip select; controls device activation and power state transitions |
| OE/VPP | Output Enable / Programming Voltage | Active-low output enable in read mode; supplies 13 V programming voltage during Rapid™ algorithm execution |
| GND | Ground | Reference return path for all signals and power domains |
| VCC | Power Supply | +5 V ±10% supply input; must be applied simultaneously with or before OE/VPP |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify-and-reprogram loop up to 10 pulses per byte |
| Integrated Product Identification Code | Electronically readable Manufacturer ID (0x1E) and Device ID (0x0D) via A9 high-voltage mode for automated programming validation |
| Dual-Line Control Architecture | Independent CE and OE/VPP inputs prevent bus contention and enable flexible memory-mapped or I/O-mapped system integration |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2,000 V ESD protection ensure stable operation in industrial environments |
| Temperature Range Support | Industrial grade (-40°C to +85°C) operation confirmed for AT27C512R-45PI/PC variants - suitable for factory automation and motor control |
Applications
| Firmware Boot Storage | Industrial PLC Memory |
|---|---|
Use Scenario: Storing boot code for 8-bit microcontrollers (e.g., 8051, PIC16) in embedded systems where firmware updates are infrequent and security against accidental overwrite is required. IC Role / Device Role / Timing Role: Non-volatile program memory providing deterministic 45 ns read latency to meet tight instruction fetch deadlines. Use Value: Eliminates need for external WAIT-state generation, enabling full-speed CPU operation without clock stretching. | Use Scenario: Holding ladder logic and configuration data in programmable logic controllers deployed in factory-floor environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Industrial-grade OTP EPROM delivering reliable data retention over 10+ years under continuous operation at -40°C to +85°C. Use Value: Avoids EEPROM wear-out limitations while maintaining guaranteed data integrity without refresh cycles. |
| Legacy System ROM Replacement | Test Equipment Firmware |
Use Scenario: Direct drop-in replacement for obsolete 27C512 variants in aging test instrumentation and medical devices requiring long-lifecycle component sourcing. IC Role / Device Role / Timing Role: Pin-compatible 28-pin PDIP EPROM supporting identical address/data/control signaling as original 27C512 designs. Use Value: Enables repair and continuity of production without PCB redesign or firmware revalidation. | Use Scenario: Storing calibration constants, self-test routines, and instrument control firmware in benchtop oscilloscopes and signal generators. IC Role / Device Role / Timing Role: High-reliability OTP memory with 2,000 V ESD rating to withstand repeated handling during calibration lab maintenance. Use Value: Prevents corruption from electrostatic discharge events common in technician-accessible equipment bays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-45PC | No Rapid™ programming algorithm; 500 µs/byte typical programming time; lacks integrated ID code | Requires longer programming cycles and manual algorithm selection in production; no electronic device verification | Select only if legacy tooling does not support Rapid™ voltage sequencing or ID code interrogation |
| MX27C512PC-45 | Same 64K×8 organization and 45 ns access; 12 V VPP requirement; no integrated ID code; lower ESD rating (1,500 V) | Compatible in read-mode timing but requires different programming voltage setup and lacks automated ID validation | Choose for cost-sensitive volume production where Rapid™ speed and ID code are non-critical |
Compared with AT27C512-45PC and MX27C512PC-45, the AT27C512R-45PC provides faster programming, built-in identification, and higher ESD robustness-making it optimal for high-yield manufacturing and field-serviceable equipment.
Availability
AT27C512R-45PC is available at Aetrix Electronics and suitable for industrial control, legacy system repair, and test equipment firmware storage requiring stable component supply across extended product lifecycles.
Supply support for AT27C512R-45PC 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 for industrial, automotive, and consumer applications.
The AT27C512R belongs to Atmel's OTP EPROM product line, designed specifically for high-reliability, low-power firmware storage in systems where code immutability, long-term data retention, and industrial temperature resilience are mandatory.
FAQ
What is the maximum operating temperature range supported by the AT27C512R-45PC?
The AT27C512R-45PC is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the Ordering Information table (page 9) for the "-45PI" and "-45PC" suffixes, where "I" denotes industrial grade. The device meets all DC and AC electrical characteristics across this full range, including 45 ns access time and ≤100 µA standby current.
Does the AT27C512R-45PC require a separate programming voltage supply?
Yes, the AT27C512R-45PC requires a dedicated 13.0 V ±0.25 V programming voltage applied to the OE/VPP pin during Rapid™ programming. This is distinct from the 5V ±10% VCC supply used for read operations. The datasheet specifies that VCC must be applied simultaneously with or before OE/VPP, and removed simultaneously or after OE/VPP, to prevent latchup or data corruption.
Can the AT27C512R-45PC be used as a direct replacement for older AT27C512 variants?
The AT27C512R-45PC is pin- and function-compatible with earlier AT27C512 versions in read mode, supporting identical address/data/control signaling. However, its Rapid™ programming algorithm and integrated ID code require updated programming equipment. For pure read-only replacement in legacy systems, it functions identically; for programming, tooling must support 13 V OE/VPP and ID code verification.
What decoupling capacitors are recommended for stable operation of the AT27C512R-45PC?
The AT27C512R-45PC requires a 0.1 µF 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 should also be added near the power entry point to stabilize the supply rail. These values are specified in the "System Considerations" section (page 2) to suppress transient excursions during CE switching.
How is the Integrated Product Identification Code accessed on the AT27C512R-45PC?
The Integrated Product Identification Code on the AT27C512R-45PC is accessed by setting A9 to 12.0 V ±0.5 V (VID), holding A1–A15 low, and toggling A0: low (VIL) selects the Manufacturer ID (0x1E), high (VIH) selects the Device ID (0x0D). This mode is detailed in the "Product Identification" operating mode table (page 3) and block diagram notes (page 4).
AT27C512R-45PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-PDIP
AT27C512R-45PC FAQ
1.How can I place an order for AT27C512R-45PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-45PC 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-45PC reliable?
The price and inventory of AT27C512R-45PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-45PC is usually 5 days.
3.What payment methods are accepted for AT27C512R-45PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-45PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-45PC?
AT27C512R-45PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-45PC 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-45PC?
For technical support, including AT27C512R-45PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-45PC requirements.
6.How does Aetrix verify that AT27C512R-45PC is sourced from the original manufacturer or authorized distributors?
All AT27C512R-45PC 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-45PC meets industry standards.
7.What is the process for return or replacement of AT27C512R-45PC?
All AT27C512R-45PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-45PC, 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-45PC part is unused and in its original packaging.
Return procedure for AT27C512R-45PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27C512R-45PC Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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