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Microchip Technology AT27C512R-70JU-T
- Part No.:
- AT27C512R-70JU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-70JU-T.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT27C512R-70JU-T 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 package. It serves as nonvolatile firmware storage in microprocessor systems, eliminating WAIT states and enabling direct execution from memory in industrial control and legacy embedded applications.
For engineers reviewing the AT27C512R-70JU-T datasheet, AT27C512R-70JU-T pinout, AT27C512R-70JU-T application, or AT27C512R-70JU-T equivalent, this page delivers verified timing specs, validated PLCC pin mapping, industrial temperature support (–40°C to +85°C), rapid programming characteristics (100µs/byte), and CMOS/TTL-compatible I/O behavior critical for legacy system upgrades and long-lifecycle designs.
Technical Context
The AT27C512R-70JU-T implements a two-line control architecture using CE (chip enable) and OE/VPP (output enable/programming voltage), supporting both read and rapid programming modes without external address latches. Its internal logic decodes 16 address lines (A0–A15) to access 65,536 bytes, with outputs O0–O7 driven in TTL/CMOS-compatible levels (VOH ≥ 2.4V, VOL ≤ 0.4V).
Programming requires VCC = 6.5V and OE/VPP = 13.0V, with a 95–105µs CE pulse width and integrated product identification code accessible via A9 = 12.0V and A0 toggling - enabling automated programmer recognition of manufacturer (0x1E) and device code (0x0D). The device features 2,000V ESD protection and 200mA latchup immunity for robust operation in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 64K × 8-bit (524,288 bits), supports full firmware image storage for 8-bit microcontrollers without external paging logic |
| Read access time | 70ns max (tACC), enables direct interface with 10–14 MHz Z80, 8085, or 68000-based systems without wait-state insertion |
| Supply voltage | 5V ±10%, compatible with standard TTL/CMOS logic rails and eliminates need for auxiliary voltage regulators |
| Standby current | 100µA max (ISB1), reduces quiescent power in battery-backed or low-power hold modes |
| Active current | 20mA max at 5MHz, supports sustained burst reads in real-time control loops without thermal derating |
| Programming speed | 100µs/byte typical, cuts firmware update time by >90% vs. conventional EPROM algorithms |
| Operating temperature | –40°C to +85°C, qualified for industrial-grade deployment in PLCs, motor drives, and instrumentation |
Pinout & Package
AT27C512R-70JU-T is supplied in a 32-lead plastic J-leaded chip carrier (PLCC) per JEDEC MS-016 variation AE, with 11.5mm × 14.9mm body, 1.27mm lead pitch, and matte tin lead finish. Pin 1 identifier located at top-left corner; pins 1 and 17 are no-connect (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address inputs | 16-bit address bus interface; fully decoded internally to select one of 65,536 bytes without external demultiplexing |
| O0–O7 | Data outputs | 8-bit bidirectional data bus outputs during read; high-impedance when CE or OE/VPP inactive |
| CE | Chip enable | Active-low global enable; controls device power state and output driver activation; used for memory banking |
| OE/VPP | Output enable / Programming supply | Dual-function pin: low during read (enables outputs); 13.0V during programming (supplies programming voltage) |
| VCC | Power supply | +5V ±10% main supply; must be applied simultaneously with or before OE/VPP to prevent latchup |
| GND | Ground reference | Common return path for all signals and power; requires local 0.1µF ceramic decoupling per device |
| NC (pins 1, 17) | No connect | Unbonded die pads; must remain unconnected on PCB to avoid parasitic coupling or ESD paths |
Key Features
| Feature | Design Value |
|---|---|
| Rapid programming algorithm | 100µs/byte typical programming time with auto-verify loop ensures field firmware updates complete in under 7 seconds for full 64K array |
| Integrated product ID code | Manufacturer (0x1E) and device code (0x0D) readable via A9=12V and A0 toggle - enables automatic algorithm selection in universal programmers |
| Two-line control (CE/OE) | Eliminates bus contention in multi-device systems; allows clean memory-mapped I/O sharing with peripherals without glue logic |
| CMOS/TTL-compatible I/O | Input thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V) and output drive (2.4V/0.4V) ensure interoperability with legacy 5V microcontrollers and FPGAs |
| High-reliability process | 2,000V HBM ESD rating and 200mA latchup immunity meet industrial surge immunity requirements per IEC 61000-4-2/4 |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing ladder logic interpreter and I/O configuration tables in DIN-rail mounted programmable logic controllers operating continuously in factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot-time firmware repository accessed at power-up; provides deterministic 70ns read latency for real-time scan cycle execution. Use Value: Enables zero-wait-state execution of control code on 8051- or Z80-based PLC CPUs, reducing cycle jitter and improving deterministic response under 10ms scan intervals. | Use Scenario: Holding BIOS and peripheral initialization routines in vintage test equipment such as digital oscilloscopes and spectrum analyzers with 8-bit CPU subsystems. IC Role / Device Role / Timing Role: Primary boot ROM mapped to fixed address space; selected via dedicated CE line tied to reset circuitry and address decoder. Use Value: Guarantees reliable firmware load after cold start or brownout recovery, with 100µA standby current preserving backup SRAM contents during extended idle periods. |
| Motor Drive Parameter Tables | Avionics Maintenance Terminal Memory |
Use Scenario: Storing torque lookup tables, PID coefficients, and safety interlock parameters in brushless DC motor drives deployed in HVAC and conveyor systems. IC Role / Device Role / Timing Role: Read-only parameter store accessed during runtime via DMA or polled reads; isolated from volatile RAM by separate CE gating. Use Value: Prevents accidental corruption of calibrated operational constants during power cycling or electromagnetic transients common in motor switching environments. | Use Scenario: Hosting diagnostic firmware and aircraft-specific configuration data in portable maintenance terminals used for Line Replaceable Unit (LRU) troubleshooting on regional jets. IC Role / Device Role / Timing Role: Field-programmable calibration and versioning memory; programmed once during depot refurbishment using 13V OE/VPP signal. Use Value: Supports traceable firmware revision control across airframe fleets via integrated ID code, satisfying DO-178B software configuration management requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-70PU | Same core spec but in 28-lead PDIP (28P6); lacks PLCC mechanical robustness and thermal performance | Suitable only for through-hole prototyping or low-vibration lab equipment; not recommended for production vibration-prone industrial mounts | Select AT27C512R-70JU-T for surface-mount reliability and higher I/O density in compact PCB layouts |
| MX29F512TC-70 | Flash-based (not OTP), supports 100k erase/write cycles; 5V-only supply; no VPP pin required | Enables field firmware updates; incompatible with rapid programming workflow and ID code verification used in legacy EPROM programmers | Choose MX29F512TC-70 only if reprogrammability is mandatory; otherwise retain AT27C512R-70JU-T for drop-in replacement in existing EPROM-based designs |
Compared with AT27C512-70PU, AT27C512R-70JU-T offers superior thermal dissipation and board-level shock resistance in PLCC packaging, while MX29F512TC-70 trades OTP permanence for field-upgradability - making AT27C512R-70JU-T optimal for fixed-function, long-lifecycle deployments where firmware immutability and programmer compatibility are design-critical.
Availability
AT27C512R-70JU-T is available at Aetrix Electronics and suitable for industrial PLCs, legacy test equipment, motor drive parameter storage, and avionics maintenance terminals requiring stable component supply across 10+ year production lifecycles.
Supply support for AT27C512R-70JU-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 support for legacy Atmel EPROM products, including datasheet documentation, programming specifications, and long-term supply commitments.
The AT27C512R series was designed specifically for industrial and automotive firmware storage where data integrity, programming simplicity, and 5V system compatibility outweigh reprogrammability - targeting applications with infrequent firmware updates and stringent qualification requirements.
FAQ
What is the maximum operating temperature range for the AT27C512R-70JU-T?
The AT27C512R-70JU-T 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 -70 speed grade and applies to continuous operation under bias. The device is not qualified for automotive-grade (–40°C to +125°C) use, despite mention of automotive ranges in general family descriptions - that rating applies only to specific variants like AT27C512R-70JU-125, not the AT27C512R-70JU-T.
Can the AT27C512R-70JU-T be programmed in-circuit?
No, the AT27C512R-70JU-T cannot be reliably programmed in-circuit. Programming requires OE/VPP = 13.0V ±0.25V and VCC = 6.5V ±0.25V - voltages incompatible with standard 5V system rails. Additionally, the datasheet mandates simultaneous application/removal of VCC and OE/VPP, and specifies strict AC timing (e.g., tPW = 95–105µs) only achievable with dedicated EPROM programmers. Attempting in-circuit programming risks latchup, data corruption, or permanent damage.
Does the AT27C512R-70JU-T support read-modify-write operations?
No, the AT27C512R-70JU-T does not support read-modify-write operations. As a one-time programmable (OTP) EPROM, its memory cells are permanently programmed during initial programming and cannot be erased or rewritten. Any modification requires physical replacement of the AT27C512R-70JU-T device. The "rapid programming algorithm" applies only to initial write; no erase mechanism exists - unlike flash or EEPROM technologies.
What decoupling capacitors are required for stable operation of the AT27C512R-70JU-T?
The AT27C512R-70JU-T requires two decoupling capacitors: a 0.1µF high-frequency ceramic capacitor placed between VCC and GND as close as possible to the device's pins, and a 4.7µF bulk electrolytic capacitor positioned near the power supply entry point to the EPROM array. These values are specified in the "System considerations" section to suppress transient voltage excursions during CE switching and stabilize VCC under dynamic load, preventing nonconformance to datasheet timing limits.
How is the integrated product identification code accessed on the AT27C512R-70JU-T?
The integrated product identification code on the AT27C512R-70JU-T is accessed by setting A9 = 12.0V ±0.5V (VID), holding A1–A15 = VIL, and toggling A0 between VIL (to read manufacturer ID 0x1E) and VIH (to read device code 0x0D). This mode is distinct from normal read or programming and requires precise voltage control on A9 - supported only by EPROM programmers compliant with Atmel's ID code protocol, not generic memory testers.
AT27C512R-70JU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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 (11.43x13.97)
AT27C512R-70JU-T FAQ
1.How can I place an order for AT27C512R-70JU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-70JU-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-70JU-T reliable?
The price and inventory of AT27C512R-70JU-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-70JU-T is usually 5 days.
3.What payment methods are accepted for AT27C512R-70JU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-70JU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-70JU-T?
AT27C512R-70JU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-70JU-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-70JU-T?
For technical support, including AT27C512R-70JU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-70JU-T requirements.
6.How does Aetrix verify that AT27C512R-70JU-T is sourced from the original manufacturer or authorized distributors?
All AT27C512R-70JU-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-70JU-T meets industry standards.
7.What is the process for return or replacement of AT27C512R-70JU-T?
All AT27C512R-70JU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-70JU-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-70JU-T part is unused and in its original packaging.
Return procedure for AT27C512R-70JU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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