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Microchip Technology AT27C512R-70JU
- Part No.:
- AT27C512R-70JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-70JU.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:7,108
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Product details
Overview
AT27C512R-70JU from Microchip Technology (formerly Atmel) is a 64K × 8-bit one-time programmable EPROM with 45ns read access time, 5V ±10% supply, and JEDEC-standard 32-lead PLCC packaging. It serves as nonvolatile firmware storage in microprocessor systems, enabling direct byte-access without wait states in industrial control and embedded boot applications.
For engineers reviewing the AT27C512R-70JU datasheet, AT27C512R-70JU pinout, AT27C512R-70JU application, or AT27C512R-70JU equivalent, key selection criteria include read timing (tACC = 70ns), standby current (ISB1 ≤ 100µA), industrial temperature range (–40°C to +85°C), and dual-mode OE/VPP pin functionality for programming and output enable.
Technical Context
The AT27C512R-70JU implements a CMOS-based OTP EPROM architecture with two-line control (CE and OE/VPP) to prevent bus contention during read cycles. Its address decoding supports full 16-bit A0–A15 mapping, and outputs O0–O7 are TTL/CMOS-compatible with VOH ≥ 2.4V at –400µA and VOL ≤ 0.4V at 2.1mA.
During rapid programming, the device uses a 100µs CE pulse width with VCC = 6.5V and OE/VPP = 13.0V to achieve typical 100µs/byte write speed. 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-bit (524,288-bit) OTP EPROM - supports full firmware image storage for 8-bit microcontrollers |
| Read access time | 70ns max (tACC) - ensures compatibility with 12MHz Z80 or 8MHz 8086 bus timing without wait states |
| Supply voltage | 5V ±10% - operates directly from standard logic rail without regulation overhead |
| Standby current | ≤100µA (ISB1, CMOS CE) - enables low-power retention in battery-backed systems |
| Active current | ≤20mA at 5MHz - compatible with legacy microprocessor bus loading requirements |
| ESD protection | 2,000V HBM - meets industrial handling robustness standards per ANSI/ESDA/JEDEC JS-001 |
| Operating temp | –40°C to +85°C - qualified for industrial-grade embedded environments |
Pinout & Package
AT27C512R-70JU is supplied in a 32-lead plastic J-leaded chip carrier (PLCC) package conforming to JEDEC MS-016, variation AE. Dimensions: 12.47mm × 14.96mm × 3.35mm (max height), lead coplanarity ≤ 0.10mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address inputs | 16-bit address bus interface; fully decoded to select one of 65,536 bytes |
| O0–O7 | Data outputs | 8-bit bidirectional data bus outputs; TTL/CMOS-compatible drive strength |
| CE | Chip enable | Active-low global enable; controls device activation and power state transitions |
| OE/VPP | Output enable / Program supply | Dual-function pin: low during read (output enable), 13.0V during programming (VPP source) |
| VCC | Power supply | 5V ±10% main supply; must be applied simultaneously with or before OE/VPP |
| GND | Ground reference | Signal and power return path; requires local 0.1µF ceramic decoupling |
| NC | No connect | Pins 1 and 17 in PLCC package - left unconnected per datasheet specification |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 100µs/byte typical - reduces firmware update time by >90% vs. conventional EPROMs |
| Integrated product ID code | Manufacturer ID 0x1E + Device ID 0x0D - enables auto-detection and algorithm selection in universal programmers |
| Two-line control architecture | Separate CE and OE/VPP pins - eliminates bus contention during partial memory access |
| High-reliability CMOS process | 200mA latchup immunity - prevents destructive current paths under transient overvoltage conditions |
| Green packaging option | Pb/halide-free PLCC - complies with RoHS Directive 2011/65/EU without derating |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing ladder logic firmware in programmable logic controllers requiring field-upgradable nonvolatile memory with long data retention. IC Role / Device Role / Timing Role: Primary boot-time instruction store accessed via 8-bit parallel bus during cold start and firmware reload. Use Value: 70ns tACC enables direct execution from EPROM on 12MHz 8051 derivatives without wait-state insertion. | Use Scenario: Providing immutable boot code for 8-bit microcontrollers in medical diagnostic instruments where firmware integrity is safety-critical. IC Role / Device Role / Timing Role: One-time programmable ROM holding initialization routines and hardware self-test sequences. Use Value: OTP architecture prevents accidental overwrite during service operations, ensuring regulatory compliance with IEC 62304 Class B software requirements. |
| Automotive ECU Calibration Data | Avionics System Configuration Memory |
Use Scenario: Storing engine calibration maps in automotive electronic control units operating across extended temperature ranges. IC Role / Device Role / Timing Role: Read-only storage for lookup tables accessed by real-time control loops during engine operation. Use Value: Industrial temperature rating (–40°C to +85°C) and 2,000V ESD protection ensure reliability in under-hood environments. | Use Scenario: Holding flight-critical configuration parameters in airborne communication transceivers requiring traceable, tamper-resistant memory. IC Role / Device Role / Timing Role: Secure nonvolatile storage for radio channel settings and cryptographic keys loaded during factory programming. Use Value: Integrated product ID code allows automated verification of correct part population during avionics BOM assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-70JU | No integrated product ID code; lacks rapid programming support; identical timing and pinout | Requires manual algorithm selection in programmers; not suitable for automated high-volume programming lines | Select AT27C512R-70JU when using modern gang programmers with auto-ID detection |
| MX27C512PC-12 | 120ns read access; 5V only (no ±10% tolerance); PDIP-only packaging; no VPP pin multiplexing | Limited to slower 8MHz bus systems; incompatible with PLCC footprint; requires separate VPP supply circuitry | Choose MX27C512PC-12 only for cost-sensitive, low-speed replacements where layout change is acceptable |
Compared with AT27C512-70JU and MX27C512PC-12, the AT27C512R-70JU delivers faster programming, guaranteed ID code support, and tighter read timing - making it optimal for automated production and industrial bus-critical designs.
Availability
AT27C512R-70JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and automotive ECU calibration data applications requiring stable component supply and long-term obsolescence management.
Supply support for AT27C512R-70JU 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 microcontrollers and memory solutions for industrial and automotive markets.
The AT27C512R product line was designed to provide high-reliability, one-time programmable nonvolatile memory for legacy and long-lifecycle embedded systems where firmware immutability and electrical robustness are mandatory.
FAQ
What is the maximum read access time specified for the AT27C512R-70JU?
The AT27C512R-70JU has a maximum address-to-output delay (tACC) of 70ns under industrial temperature and voltage conditions. This value is measured with CE and OE/VPP both asserted low, CL = 100pF, and applies specifically to the -70 speed grade. The AT27C512R-70JU meets this specification across its full operating range of –40°C to +85°C and 5V ±10% supply.
Does the AT27C512R-70JU support in-system programming?
No, the AT27C512R-70JU does not support in-system programming. It is a one-time programmable EPROM requiring UV-erasure prevention and external high-voltage (13.0V) programming via the OE/VPP pin in a dedicated programmer. Programming must occur before soldering, as the AT27C512R-70JU lacks internal charge pumps or ISP circuitry.
What is the function of the OE/VPP pin on the AT27C512R-70JU?
The OE/VPP pin on the AT27C512R-70JU serves two distinct functions: during normal read operation, it acts as output enable (active-low); during programming, it supplies the 13.0V VPP programming voltage. The AT27C512R-70JU uses this dual-role pin to reduce package count while maintaining compatibility with standard EPROM programmers that generate VPP externally.
Can the AT27C512R-70JU operate with a 3.3V supply?
No, the AT27C512R-70JU requires a 5V ±10% supply and is not rated for 3.3V operation. Its input thresholds (VIH ≥ 2.0V, VIL ≤ 0.8V), output drive strength (VOH ≥ 2.4V at –400µA), and internal logic are designed exclusively for 5V TTL/CMOS systems. Using 3.3V will result in undefined behavior, failed reads, and potential damage during programming due to insufficient VPP headroom.
Is the AT27C512R-70JU RoHS compliant?
Yes, the AT27C512R-70JU is RoHS compliant as a green (Pb/halide-free) packaged device. The "JU" suffix explicitly denotes the 32-lead PLCC package with matte tin lead finish meeting Directive 2011/65/EU. This compliance is documented in Atmel's ordering information table and verified through Microchip's material declarations for the AT27C512R-70JU.
AT27C512R-70JU 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:
- 70 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-70JU FAQ
1.How can I place an order for AT27C512R-70JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-70JU 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-70JU reliable?
The price and inventory of AT27C512R-70JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-70JU is usually 5 days.
3.What payment methods are accepted for AT27C512R-70JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-70JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-70JU?
AT27C512R-70JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-70JU 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-70JU?
For technical support, including AT27C512R-70JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-70JU requirements.
6.How does Aetrix verify that AT27C512R-70JU is sourced from the original manufacturer or authorized distributors?
All AT27C512R-70JU 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-70JU meets industry standards.
7.What is the process for return or replacement of AT27C512R-70JU?
All AT27C512R-70JU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-70JU, 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-70JU part is unused and in its original packaging.
Return procedure for AT27C512R-70JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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