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Microchip Technology AT27C512R-70TU
- Part No.:
- AT27C512R-70TU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-70TU.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,695
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Product details
Overview
AT27C512R-70TU from Atmel is a 64K × 8-bit one-time programmable EPROM (OTP EPROM) with 45 ns read access time, 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It features CMOS/TTL-compatible I/O, dual-line control (CE/OE), and integrated product identification code for automated programming. Used in firmware storage for microprocessor systems requiring non-volatile, low-latency code access without wait states.
For engineers reviewing the AT27C512R-70TU datasheet, AT27C512R-70TU pinout, AT27C512R-70TU application, or AT27C512R-70TU equivalent, this page delivers verified package mapping (28-lead TSOP), JEDEC-compliant timing parameters, rapid programming algorithm details (100 µs/byte), ESD/latchup specs, and real-world use context for embedded firmware storage and boot memory design.
Technical Context
The AT27C512R-70TU implements a high-reliability OTP EPROM architecture using scaled CMOS technology, supporting fast random-access reads with tACC = 70 ns and tOE = 30 ns under 5V operation. Its two-line enable scheme (CE and OE/VPP) enables bus contention avoidance in multi-device systems.
Programming uses a rapid 100 µs CE pulse at VCC = 6.5V and OE/VPP = 13.0V, with verification/reprogramming loops per byte. The integrated product ID code (Manufacturer: 0x1E, Device: 0x0D) is accessed via A9 = 12.0V and A0 toggling, enabling automatic algorithm selection in industry-standard programmers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8), sufficient for full firmware images in 8-bit microcontroller boot loaders |
| Read Access Time | 70 ns max - eliminates WAIT states on 14 MHz+ Z80/8051-class systems |
| VCC Supply | 5V ±10% - compatible with legacy TTL/CMOS logic rails without regulation overhead |
| Active Current | 20 mA max at 5 MHz - enables low-power operation in battery-backed or energy-constrained systems |
| Standby Current | 100 µA max - supports long-term retention in always-on embedded controllers |
| ESD Protection | 2,000V HBM - ensures robustness during board handling and in-circuit programming |
| Latchup Immunity | 200 mA - prevents destructive latchup during voltage transients or hot-plug events |
Pinout & Package
AT27C512R-70TU is supplied in a 28-lead Thin Small Outline Package (TSOP, Type 1), JEDEC MO-183 compliant, footprint size 8 mm × 13.4 mm, height ≤1.20 mm - optimized for high-density PCB layouts and automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; selects one of 65,536 bytes for read or program access |
| O0–O7 | Data Outputs | 8-bit bidirectional data path during read; high-impedance when CE or OE inactive |
| CE | Chip Enable | Primary device select; must be low for read or program; controls power state transition |
| OE/VPP | Output Enable / Program Voltage | Read mode: output enable; Program mode: 13.0V programming supply input |
| VCC | Power Supply | 5V ±10% main supply; must be applied before/with OE/VPP and removed after |
| GND | Ground Reference | Common return path; requires local 0.1 µF ceramic decoupling per device |
Key Features
| Feature | Design Value |
|---|---|
| Rapid Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop - reduces production programming cycle time by >5× vs legacy EPROMs |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device ID (0x0D) readable via A9=12V/A0 toggle - enables plug-and-play compatibility with universal programmers |
| Dual-Line Control (CE/OE) | Independent chip and output enables - allows flexible bus arbitration and eliminates external gating logic in multi-memory systems |
| Green (Pb/Halide-free) Packaging | RoHS-compliant TSOP package - meets EU WEEE/RoHS directives and supports lead-free reflow profiles |
| Industrial Temperature Range | –40°C to +85°C operation - qualified for deployment in factory automation, industrial HMIs, and telecom line cards |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing ladder logic interpreter and I/O configuration in compact programmable logic controllers deployed in factory environments. IC Role / Device Role / Timing Role: Non-volatile boot memory providing immediate code execution upon power-up; accessed via 8-bit parallel bus at ≤14 MHz clock rates. Use Value: 70 ns access time ensures zero-wait-state execution of real-time control routines; 100 µA standby current extends uptime in battery-buffered backup modes. | Use Scenario: Holding initialization code and peripheral drivers for Z80, 8051, or 68000-based embedded systems where flash replacement is not feasible. IC Role / Device Role / Timing Role: Primary boot ROM mapped to fixed address space; selected via dedicated CE signal in memory-mapped I/O architecture. Use Value: CMOS/TTL compatibility eliminates level-shifting components; 2,000V ESD protection sustains reliability during field servicing and reprogramming. |
| Automated Test Equipment (ATE) Calibration Data | Medical Device Configuration Memory |
Use Scenario: Storing calibration coefficients and test sequence tables in benchtop ATE platforms requiring traceable, unalterable data sets. IC Role / Device Role / Timing Role: OTP storage for mission-critical constants; programmed once during final test and locked permanently. Use Value: Rapid 100 µs/byte programming enables high-throughput calibration data loading; integrated ID code guarantees correct part verification pre-deployment. | Use Scenario: Retaining FDA-approved device configuration parameters (e.g., alarm thresholds, sensor scaling) in Class II medical instruments with long service life. IC Role / Device Role / Timing Role: Tamper-resistant configuration store; accessed only during power-on self-test (POST) and not modified in field operation. Use Value: 200 mA latchup immunity prevents catastrophic failure during ESD events in clinical environments; green packaging satisfies medical regulatory material restrictions. |
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 OTP EPROM function but in 28-lead SOIC (28R) package; no green/Pb-free designation; not recommended for new designs per Atmel documentation | Larger footprint (18.5 mm × 12.5 mm) and higher profile; incompatible with fine-pitch TSOP land patterns | Select AT27C512R-70TU for new designs requiring RoHS compliance, SMT scalability, and JEDEC MO-183 footprint standardization |
| AM27C512-70DC | AMD-manufactured 64K×8 OTP EPROM; 70 ns access, 5V supply, PDIP/PLCC packages only; lacks integrated product ID and green packaging | No TSOP option; no A9-based ID read capability; requires manual algorithm selection in programmers | Choose AT27C512R-70TU when automated programming, smaller form factor, or environmental compliance are required |
Compared with AT27C512-70PU and AM27C512-70DC, the AT27C512R-70TU delivers superior manufacturability via its green TSOP package, eliminates programming setup overhead with built-in ID codes, and supports modern high-density PCB layouts - making it the preferred choice for new industrial and medical designs.
Availability
AT27C512R-70TU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and medical device configuration memory requiring stable component supply across extended product lifecycles.
Supply support for AT27C512R-70TU 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 was a U.S.-based semiconductor company specializing in microcontrollers, non-volatile memory, and analog products before its acquisition by Microchip Technology in 2016.
The AT27C512R series was designed as a high-reliability, drop-in upgrade to earlier EPROM families, targeting industrial and automotive firmware storage where data integrity, programming speed, and long-term retention are critical.
FAQ
What is the maximum operating temperature range for the AT27C512R-70TU?
The AT27C512R-70TU is rated for industrial temperature operation from –40°C to +85°C. This range is confirmed in the Ordering Information section (19.1) and Operating Modes table, and applies specifically to the TU suffix variant. It does not support the automotive range (–40°C to +125°C), which is designated by the 'A' suffix (e.g., AT27C512R-70RA).
Does the AT27C512R-70TU require a separate programming voltage supply?
Yes - the AT27C512R-70TU requires OE/VPP to be raised to 13.0V ±0.25V during programming, while VCC is set to 6.5V ±0.25V. These voltages are specified in the DC Programming Characteristics table. During normal read operation, only 5V ±10% on VCC is needed; OE/VPP functions as Output Enable at TTL/CMOS logic levels.
How is the Integrated Product Identification Code read from the AT27C512R-70TU?
The AT27C512R-70TU's ID code is read by setting A9 to 12.0V (VID = 11.5–12.5V), holding A1–A15 low, and toggling A0: low selects Manufacturer ID (0x1E), high selects Device ID (0x0D). This method is defined in Section 17 and requires precise voltage control - not achievable with standard 5V logic drivers.
What decoupling capacitors are required for stable operation of the AT27C512R-70TU?
Per Section 3 (System Considerations), each AT27C512R-70TU requires a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND as close to the pins as possible. For arrays, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point - both are mandatory to suppress transients during CE switching and ensure datasheet-compliant operation.
Is the AT27C512R-70TU pin-compatible with the AT27C512R-70PI (PDIP) version?
No - the AT27C512R-70TU (28-lead TSOP) and AT27C512R-70PI (28-lead PDIP) share identical pin functions but differ in physical layout, pitch, and mechanical dimensions. They are functionally equivalent and electrically compatible, but not mechanically interchangeable; PCB redesign is required to switch between TSOP and PDIP packages.
AT27C512R-70TU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- 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:
- 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-70TU FAQ
1.How can I place an order for AT27C512R-70TU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-70TU 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-70TU reliable?
The price and inventory of AT27C512R-70TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-70TU is usually 5 days.
3.What payment methods are accepted for AT27C512R-70TU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-70TU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-70TU?
AT27C512R-70TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-70TU 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-70TU?
For technical support, including AT27C512R-70TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-70TU requirements.
6.How does Aetrix verify that AT27C512R-70TU is sourced from the original manufacturer or authorized distributors?
All AT27C512R-70TU 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-70TU meets industry standards.
7.What is the process for return or replacement of AT27C512R-70TU?
All AT27C512R-70TU units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-70TU, 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-70TU part is unused and in its original packaging.
Return procedure for AT27C512R-70TU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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