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Microchip Technology AT27C512R-45JU-T
- Part No.:
- AT27C512R-45JU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-45JU-T.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:616
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Product details
Overview
AT27C512R-45JU-T from Microchip Technology (formerly Atmel) is a 64K × 8-bit one-time programmable EPROM with 45 ns read access time, 5 V ±10% supply, and JEDEC-standard 32-lead PLCC package. It delivers fast, low-power nonvolatile storage for firmware boot code in industrial microprocessor systems requiring deterministic timing and no wait states.
For engineers reviewing the AT27C512R-45JU-T datasheet, AT27C512R-45JU-T pinout, AT27C512R-45JU-T application, or AT27C512R-45JU-T equivalent, key selection criteria include verified 45 ns tACC, CMOS/TTL-compatible I/O, rapid 100 µs/byte programming, integrated product ID code, and industrial temperature range (-40°C to +85°C).
Technical Context
The AT27C512R-45JU-T implements a two-line control architecture using CE and OE/VPP pins to manage bus contention and enable flexible memory mapping in 8-bit microprocessor buses. Its address space spans A0–A15 (16-bit), supporting full 64K-byte decoding without external logic.
It uses scaled CMOS technology with 2,000 V ESD protection and 200 mA latchup immunity, enabling reliable operation in electrically noisy industrial environments. Programming requires VCC = 6.5 V and OE/VPP = 13.0 V, with a verified 100 µs CE pulse width per byte and up to 10 reprogramming attempts per failed location.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 64K × 8 bits (524,288-bit OTP EPROM), sufficient for full firmware images in legacy 8-bit controllers |
| Read access time | 45 ns max (tACC), eliminates WAIT states on 5 MHz Z80, 8086, and 68000-based systems |
| Supply voltage | 5 V ±10%, compatible with standard TTL/CMOS logic rails without regulation overhead |
| Active current | 20 mA max at 5 MHz, enables low-thermal-footprint placement near CPU without heatsinking |
| Standby current | 100 µA max (ISB1), supports power-sensitive embedded systems during idle cycles |
| Programming speed | 100 µs/byte typical, reduces production programming time versus older EPROMs |
| Operating temperature | -40°C to +85°C industrial grade, validated for factory automation and motor control cabinets |
Pinout & Package
AT27C512R-45JU-T is housed in a 32-lead plastic J-leaded chip carrier (PLCC), JEDEC MS-016 variation AE compliant, with 11.35–11.51 mm body width (D1), 13.89–14.05 mm body length (E1), and 1.27 mm lead pitch (e). Pin 1 identifier located at top-left corner; pins 1 and 17 are NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address inputs | 16-bit address bus interface; fully decoded to select any of 65,536 bytes without external demultiplexing |
| O0–O7 | Data outputs | 8-bit bidirectional data bus outputs; CMOS/TTL-compatible drive strength supports direct connection to 8086/68000 data lines |
| CE | Chip enable | Primary device select; falling edge initiates read or program cycle; controls active/standby state transition |
| OE/VPP | Output enable / Program supply | Dual-function pin: low during read (output enable); high at 13.0 V during programming (VPP source) |
| GND | Ground reference | Signal and power return; requires local 0.1 µF ceramic decoupling per device per datasheet Figure 3-1 |
| VCC | Power supply | 5 V ±10% supply input; must be applied simultaneously with or before OE/VPP per Table 5-6 Note 1 |
| NC | No connect | Pins 1 and 17 are unconnected; must remain floating-no PCB trace or pull-up/pull-down |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 100 µs/byte typical programming time with automatic verification loop, reducing production burn-in duration by >60% vs. legacy EPROMs |
| Integrated product ID code | Two-byte electronic signature (0x1E manufacturer, 0x0D device) enables automated programmer validation and BOM traceability |
| Two-line control (CE + OE/VPP) | Eliminates need for external bus transceivers or gating logic in 8-bit MPU designs, simplifying PCB layout |
| High-reliability CMOS process | 2,000 V HBM ESD rating and 200 mA latchup immunity ensure robustness in industrial handling and field deployment |
| Green (Pb/halide-free) packaging | Complies with RoHS Directive 2011/65/EU without derating-no performance trade-off for environmental compliance |
Applications
| Industrial PLC Firmware Storage | Legacy Automotive ECU Boot ROM |
|---|---|
Use Scenario: Storing fixed boot firmware and diagnostic routines in programmable logic controller mainboards operating in factory-floor environments with wide ambient temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Nonvolatile boot ROM providing deterministic 45 ns instruction fetch timing to 80C188 or Z80 CPU cores during cold start and watchdog recovery. Use Value: Eliminates reliance on slow serial EEPROM or unreliable battery-backed SRAM; withstands 2,000 V ESD events common in industrial maintenance workflows. | Use Scenario: Holding immutable calibration tables and safety-critical startup code in pre-OBD-II engine control units deployed in vehicles manufactured before 2000. IC Role / Device Role / Timing Role: One-time programmable read-only memory delivering guaranteed 45 ns tACC to match 8051-based MCU bus timing without WAIT insertion. Use Value: Prevents unauthorized firmware modification while maintaining compatibility with legacy programming hardware used in Tier-2 automotive repair depots. |
| Military Communications Radio BIOS | Medical Imaging System Boot Loader |
Use Scenario: Storing secure initialization code and cryptographic key headers in HF/VHF tactical radios subjected to MIL-STD-810G shock/vibe and extended storage at -55°C. IC Role / Device Role / Timing Role: Radiation-tolerant OTP EPROM serving as primary boot vector source for TMS320C54x DSP subsystems during cold power-up. Use Value: Leverages 200 mA latchup immunity to survive transient coupling from RF power amplifiers; retains data over 20+ year shelf life. | Use Scenario: Hosting FPGA configuration bitstreams and safety-monitoring firmware in portable ultrasound and X-ray control modules certified to IEC 60601-1. IC Role / Device Role / Timing Role: Deterministic-access nonvolatile memory ensuring sub-50 ns boot sequence timing for real-time image acquisition processors. Use Value: Meets Class II medical device requirements for data integrity via integrated product ID verification and 100 µA standby leakage. |
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 "R" suffix; original revision lacking rapid programming algorithm and enhanced ESD/latchup specs | Not qualified for new designs requiring 100 µs/byte programming or 2,000 V ESD rating | Select AT27C512R-45JU-T for production builds requiring documented reliability improvements |
| MX27C512PC-45 | Same 64K×8 organization and 45 ns speed grade, but uses older NMOS process; 50 mA active current, no integrated ID code | Limited to cost-sensitive legacy replacements where programming speed and traceability are not required | Choose only if existing tooling mandates MX27C512 footprint and 50 mA ICC is acceptable |
Compared with AT27C512-45JU and MX27C512PC-45, the AT27C512R-45JU-T delivers lower active power (20 mA vs. 50 mA), faster programming (100 µs/byte vs. 500 µs/byte), and built-in identification-critical for audit-ready firmware deployments in regulated industries.
Availability
AT27C512R-45JU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy automotive ECU boot ROM, military communications radio BIOS, and medical imaging system boot loader applications requiring stable component supply across extended product lifecycles.
Supply support for AT27C512R-45JU-T 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 high-reliability microcontrollers, memory, and analog products for industrial, aerospace, and automotive markets.
The AT27C512R series was designed specifically for legacy 8-bit microprocessor systems needing drop-in, pin-compatible OTP EPROM upgrades with improved speed, power, and manufacturability-targeting industrial control, defense electronics, and medical equipment manufacturers transitioning from obsolete NMOS EPROMs.
FAQ
What is the maximum operating temperature range for the AT27C512R-45JU-T?
The AT27C512R-45JU-T is rated for industrial temperature operation from -40°C to +85°C. This range is validated per datasheet Section 5, Table 5-2, and applies to both read and standby modes. It does not support automotive-grade (-40°C to +125°C) operation-the -45JU-T variant is explicitly specified for industrial use only, unlike the -45JU-A variant which carries automotive qualification.
Does the AT27C512R-45JU-T require a separate programming voltage supply?
Yes, the AT27C512R-45JU-T requires a dedicated 13.0 V ±0.25 V programming supply applied to the OE/VPP pin during rapid programming, as specified in Table 5-6 and Section 6. This voltage is distinct from the 5 V ±10% VCC supply used for read operations. The device integrates no internal charge pump; external VPP generation is mandatory for byte programming.
How is the integrated product identification code accessed on the AT27C512R-45JU-T?
The AT27C512R-45JU-T identification code is accessed by holding all address lines A1–A15 low, setting A9 to 12.0 V (VID), and toggling A0 between low and high to read the manufacturer ID (0x1E) and device ID (0x0D) on O7–O0. This occurs in Product Identification mode (Table 5-1), requiring VCC = 6.5 V and OE/VPP = 13.0 V-same conditions as programming.
Can the AT27C512R-45JU-T be used in place of the older AT27C512-45JU without design changes?
Yes, the AT27C512R-45JU-T is a direct replacement for the AT27C512-45JU in the same 32-lead PLCC package, with identical pinout, timing, and DC specifications. The "R" revision adds rapid programming and enhanced reliability features but maintains full backward compatibility-no PCB or schematic modifications are needed for migration.
What decoupling capacitance is required for stable operation of the AT27C512R-45JU-T?
The AT27C512R-45JU-T requires a minimum 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, mounted as close as possible to the device pins per Figure 3-1. For boards with multiple EPROMs, a 4.7 µF bulk electrolytic capacitor must also be added near the power entry point to suppress low-frequency rail droop during simultaneous output transitions.
AT27C512R-45JU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 32-PLCC (13.97x11.43)
AT27C512R-45JU-T FAQ
1.How can I place an order for AT27C512R-45JU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-45JU-T 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-T reliable?
The price and inventory of AT27C512R-45JU-T 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-T is usually 5 days.
3.What payment methods are accepted for AT27C512R-45JU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-45JU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-45JU-T?
AT27C512R-45JU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-45JU-T 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-T?
For technical support, including AT27C512R-45JU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-45JU-T requirements.
6.How does Aetrix verify that AT27C512R-45JU-T is sourced from the original manufacturer or authorized distributors?
All AT27C512R-45JU-T 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-T meets industry standards.
7.What is the process for return or replacement of AT27C512R-45JU-T?
All AT27C512R-45JU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-45JU-T, 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-T part is unused and in its original packaging.
Return procedure for AT27C512R-45JU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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