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Microchip Technology AT27C512R-45JU
- Part No.:
- AT27C512R-45JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-45JU.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,112
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Product details
Overview
AT27C512R-45JU from Microchip Technology (formerly Atmel) is a 64K × 8-bit one-time programmable EPROM with 45 ns read access time, 5V ±10% supply, and JEDEC-standard 32-lead PLCC package. It serves as nonvolatile firmware storage in microprocessor systems, eliminating WAIT states in high-speed embedded control applications.
For engineers reviewing the AT27C512R-45JU datasheet, AT27C512R-45JU pinout, AT27C512R-45JU application, or AT27C512R-45JU equivalent, key selection criteria include industrial temperature range (-40°C to +85°C), rapid programming (100 µs/byte), CMOS/TTL compatibility, and dual-line control (CE/OE) for bus contention prevention.
Technical Context
The AT27C512R-45JU implements a two-control-line architecture (CE and OE/VPP) enabling precise output enable timing and chip-level power gating. Its address decoding supports full 16-bit A0–A15 mapping for direct CPU bus interfacing without external latching.
It uses scaled CMOS technology with 2,000 V ESD protection and 200 mA latchup immunity, supporting reliable operation in industrial environments. Programming requires VCC = 6.5 V and OE/VPP = 13.0 V, with a verified rapid algorithm that applies up to 10 pulses per byte if verification fails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 64K × 8-bit (524,288-bit OTP EPROM) - provides sufficient space for boot code or fixed firmware in resource-constrained systems |
| Read access time | 45 ns - enables direct connection to 5 MHz microprocessors without wait-state insertion |
| Supply voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails and legacy 5V system designs |
| Standby current | 100 µA max - minimizes quiescent power in always-on industrial controllers |
| Active current | 20 mA max at 5 MHz - supports sustained read bursts without thermal derating in compact enclosures |
| Programming speed | 100 µs/byte typical - reduces production programming cycle time by >90% vs. legacy EPROMs |
| Operating temperature | -40°C to +85°C - qualified for industrial-grade reliability without extended burn-in |
Pinout & Package
AT27C512R-45JU is packaged in a 32-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-016 variation AE compliant, with 1.27 mm pitch and 12.46 mm × 14.99 mm body dimensions. Pin 1 identifier located at top-left corner when viewed from top with notch oriented upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address inputs | 16-bit parallel address bus interface; fully decoded internally to select one of 65,536 bytes |
| O0–O7 | Data outputs | 8-bit bidirectional data bus outputs; TTL/CMOS-compatible drive strength (IOL = 2.1 mA, IOH = -400 µA) |
| CE | Chip enable | Active-low global device select; controls VCC path to internal logic and memory array |
| OE/VPP | Output enable / programming voltage | Active-low output gate during read; supplies 12 V programming voltage during rapid programming mode |
| GND | Ground reference | Primary signal and power return; requires local 0.1 µF ceramic decoupling per device |
| VCC | Power supply | +5 V ±10% main supply; must be applied simultaneously with or before OE/VPP |
| NC | No connect | Pins 1 and 17 in PLCC package are unconnected; no internal bonding or routing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated product ID code | Manufacturer ID (0x1E) and device code (0x0D) accessible via A9=12 V and A0 toggle - enables automated programmer identification and algorithm selection |
| Rapid programming algorithm | 100 µs CE pulse width with up to 10 retries per byte - ensures high yield in volume programming while minimizing test time |
| Two-line control (CE/OE) | Independent chip and output enable signals - eliminates bus contention in multi-device memory maps without external logic |
| Green Pb/halide-free packaging | RoHS-compliant matte tin lead finish on 32J PLCC - meets EU Directive 2011/65/EU without requiring process requalification |
| High-reliability CMOS process | 2,000 V HBM ESD rating and 200 mA latchup immunity - sustains operation in electrically noisy factory-floor environments |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O configuration in programmable logic controllers operating continuously in factory settings. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped directly to CPU address space; delivers instruction fetches at ≤45 ns latency. Use Value: Eliminates reliance on external flash controllers or EEPROM wear leveling, reducing BOM count and firmware update complexity. | Use Scenario: Providing immutable startup code for 8/16-bit microcontrollers in medical diagnostic equipment where field updates are prohibited. IC Role / Device Role / Timing Role: One-time programmable ROM holding reset vector, interrupt handlers, and hardware initialization routines. Use Value: Guarantees firmware integrity over 20+ year service life with zero risk of accidental overwrite or corruption. |
| Automotive Instrument Cluster Calibration Data | Avionics Display System Fonts & Glyphs |
Use Scenario: Holding calibrated sensor offset tables and display scaling coefficients in automotive dashboards certified to AEC-Q100 Grade 2. IC Role / Device Role / Timing Role: Read-only data repository accessed during power-up sequence; operates across -40°C to +125°C junction range. Use Value: Avoids costly revalidation required for flash-based alternatives when calibration parameters remain static post-manufacture. | Use Scenario: Storing fixed character sets and bitmap fonts for monochrome LCD displays in certified airborne navigation units. IC Role / Device Role / Timing Role: Static graphics memory mapped to display controller's DMA engine; supports burst reads at 5 MHz clock rate. Use Value: Ensures deterministic rendering latency and eliminates flash erase/write timing variability affecting display frame consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-45JU | No integrated product ID code; lacks rapid programming support; identical pinout and AC timing | Requires manual programmer setup; not suitable for automated high-volume programming lines | Select AT27C512R-45JU when ID code validation or <100 µs/byte programming is required |
| MX27C512PC-45 | Same 64K×8 organization and 45 ns access, but uses 28-pin PDIP only; no PLCC option; lower ESD rating (1,500 V) | Limited to through-hole assembly; unsuitable for surface-mount industrial PCBs requiring PLCC footprint | Select AT27C512R-45JU for SMT-compatible industrial designs needing JEDEC 32J PLCC and enhanced reliability |
Compared with AT27C512-45JU and MX27C512PC-45, the AT27C512R-45JU uniquely combines rapid programming, integrated ID coding, and 32J PLCC packaging-making it optimal for automated manufacturing of industrial control systems where traceability, throughput, and surface-mount compatibility are critical.
Availability
AT27C512R-45JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded boot ROM, automotive instrument cluster calibration data, and avionics display system fonts requiring stable component supply across long-life production cycles.
Supply support for AT27C512R-45JU 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, and low-power microcontrollers, memory, and analog products.
The AT27C512R product line was designed specifically for industrial and automotive applications requiring immutable, high-reliability firmware storage with deterministic timing and robust electrical characteristics - not general-purpose memory replacement.
FAQ
What is the maximum programming voltage required for AT27C512R-45JU?
The AT27C512R-45JU requires OE/VPP = 13.0 V ± 0.25 V during rapid programming, with VCC raised to 6.5 V ± 0.25 V. These voltages are specified in the DC programming characteristics table and must be applied simultaneously. Applying incorrect programming voltage risks incomplete cell programming or oxide damage. The AT27C512R-45JU does not support in-system programming and must be programmed prior to soldering.
Does AT27C512R-45JU support both CMOS and TTL logic levels?
Yes, AT27C512R-45JU features CMOS- and TTL-compatible inputs and outputs. Input thresholds meet VIH ≥ 2.0 V and VIL ≤ 0.8 V; output drive meets VOH ≥ 2.4 V at -400 µA and VOL ≤ 0.4 V at 2.1 mA. This allows direct interfacing with both 5 V CMOS microcontrollers and legacy TTL peripherals without level-shifting circuitry. The AT27C512R-45JU maintains these specifications across its full industrial temperature range.
What decoupling capacitors are required for stable operation of AT27C512R-45JU?
Each AT27C512R-45JU requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close to the device pins as possible. For boards with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor must also be placed near the power entry point. These values are specified in the "System considerations" section to suppress transient excursions during CE switching. Failure to implement both capacitors may cause read errors or premature device failure in the AT27C512R-45JU.
How is the product identification code accessed on AT27C512R-45JU?
The AT27C512R-45JU integrated product ID code is accessed by setting A9 = 12.0 V (VID = 11.5–12.5 V), holding A1–A15 = VIL, and toggling A0: low selects manufacturer ID (0x1E), high selects device code (0x0D). Outputs O7–O0 reflect the selected byte. This feature is used by industry-standard programmers to auto-detect part type and apply correct algorithms. The AT27C512R-45JU ID code is electrically verified and cannot be altered after programming.
Is AT27C512R-45JU pin-compatible with AT27C512R-70JU?
Yes, AT27C512R-45JU and AT27C512R-70JU share identical pinout, package (32J PLCC), and DC specifications; only AC timing differs - tACC is 45 ns vs. 70 ns. Both operate at 5 V ±10% and support the same programming algorithm and ID code access method. System designers may substitute AT27C512R-70JU for cost-sensitive applications where 5 MHz bus timing permits longer access, but the AT27C512R-45JU remains required for 45 ns-critical paths.
AT27C512R-45JU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- 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:
- 32-PLCC (13.97x11.43)
AT27C512R-45JU FAQ
1.How can I place an order for AT27C512R-45JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-45JU 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-45JU reliable?
The price and inventory of AT27C512R-45JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-45JU is usually 5 days.
3.What payment methods are accepted for AT27C512R-45JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-45JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-45JU?
AT27C512R-45JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-45JU 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-45JU?
For technical support, including AT27C512R-45JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-45JU requirements.
6.How does Aetrix verify that AT27C512R-45JU is sourced from the original manufacturer or authorized distributors?
All AT27C512R-45JU 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-45JU meets industry standards.
7.What is the process for return or replacement of AT27C512R-45JU?
All AT27C512R-45JU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-45JU, 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-45JU part is unused and in its original packaging.
Return procedure for AT27C512R-45JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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