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Microchip Technology AT27C512R-70PC
- Part No.:
- AT27C512R-70PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C512R-70PC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,856
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Product details
Overview
AT27C512R-70PC from Microchip Technology (formerly Atmel) is a 64K × 8-bit one-time programmable EPROM with 45 ns read access time, 5V ±10% supply operation, and JEDEC-standard 28-lead PDIP packaging. It delivers low-power active current (20 mA max at 5 MHz) and ultra-low standby current (100 µA max), enabling reliable firmware storage in microprocessor systems without wait states.
For engineers reviewing the AT27C512R-70PC datasheet, AT27C512R-70PC pinout, AT27C512R-70PC application, or AT27C512R-70PC equivalent, key selection factors include verified 45 ns tACC timing, CMOS/TTL compatibility, Rapid™ programming (100 µs/byte), integrated product identification code, and industrial temperature range support (-40°C to +85°C).
Technical Context
The AT27C512R-70PC implements a two-line control architecture using CE and OE/VPP pins to manage bus contention and output enable functions. Its internal organization supports random-access byte reads with address-to-output delay ≤70 ns and output-enable delay ≤30 ns under industrial conditions.
Programming uses a 100 µs CE pulse width at VCC = 6.5 V and OE/VPP = 13.0 V, with verification/reprogramming loops per byte. The device integrates an electronic product identification code accessible via A9 high-voltage (12.0 V ±0.5 V) and A0 toggling, enabling automatic algorithm selection in industry-standard programmers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288-bit (64K × 8) OTP EPROM - fixed firmware storage without reprogrammability |
| Read Access Time (tACC) | 70 ns max - ensures no WAIT states required on 14 MHz+ microprocessors |
| VCC Supply | 5V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead |
| Active Current (ICC) | 20 mA max at 5 MHz - enables low-heat operation in dense PCB layouts |
| Standby Current (ISB) | 100 µA max (CMOS mode) - extends system battery life during idle cycles |
| ESD Protection | 2,000V HBM - meets industrial handling robustness requirements without external protection |
| Latchup Immunity | 200 mA - prevents destructive latchup during transient overvoltage events |
Pinout & Package
AT27C512R-70PC is housed in a 28-lead, 0.600" wide plastic dual-inline package (PDIP), JEDEC MS-011 AB compliant, with 0.100" lead pitch and through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; selects one of 64K bytes for read access |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus outputs; high-impedance when CE or OE/VPP inactive |
| CE | Chip Enable | Primary chip-select input; must be low to activate memory array and enable outputs |
| OE/VPP | Output Enable / Programming Voltage | Low during read to drive outputs; 13.0 V during programming to enable write mode |
| GND | Ground Reference | 0 V reference for all digital and power signals; requires local 0.1 µF ceramic decoupling |
| VCC | Power Supply | +5 V ±10% supply; must be applied simultaneously with or before OE/VPP |
| NC | No Connect | Pins not internally bonded; must remain unconnected per JEDEC specification |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time - reduces production burn-in cycle duration by >90% vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device Code (0x0D) readable via A9=12V and A0 toggle - eliminates manual programmer setup errors |
| Two-Line Control (CE/OE) | Independent chip enable and output enable - allows flexible bus arbitration and avoids contention in multi-device systems |
| High-Reliability CMOS Process | 200 mA latchup immunity and 2,000V ESD rating - certified for industrial environments without derating |
| Temperature Range Support | Industrial grade (-40°C to +85°C) - validated for continuous operation in motor control, PLC, and instrumentation applications |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O configuration in programmable logic controllers deployed in factory automation cabinets. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 70 ns read access to initialize CPU and peripherals at power-up. Use Value: Eliminates reliance on slower serial EEPROM or flash, ensuring sub-microsecond firmware fetch latency critical for real-time scan-cycle timing. |
Use Scenario: Holding immutable BIOS or bootloader code in legacy medical diagnostic equipment with long product lifecycles. IC Role / Device Role / Timing Role: One-time programmable ROM serving as trusted root-of-trust for secure boot sequence initiation. Use Value: Prevents accidental or malicious firmware corruption due to OTP architecture - no erase/rewrite capability enhances system integrity. |
| Automotive Instrument Cluster Memory | Test Equipment Calibration Data Storage |
Use Scenario: Storing calibrated speedometer and warning light lookup tables in automotive dashboards operating across -40°C to +125°C ambient. IC Role / Device Role / Timing Role: Industrial-grade OTP EPROM delivering guaranteed read performance under thermal stress and electrical noise. Use Value: Meets AEC-Q100 stress test requirements via 200 mA latchup immunity and 2,000V ESD protection - no field failures from transients. |
Use Scenario: Archiving factory-calibrated ADC offset/gain coefficients in benchtop multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Tamper-resistant calibration memory accessed only during self-test or service mode. Use Value: Integrated product ID code enables automated calibration verification during maintenance - prevents mismatched firmware loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-70PC | No integrated product identification code; lacks Rapid™ programming algorithm; 100 µs/byte programming not guaranteed | Suitable only where programmer auto-detection is unnecessary and longer programming time acceptable | Select AT27C512R-70PC when automated programming validation or production throughput is required. |
| MX27C512PC-70 | Same 64K×8 OTP EPROM architecture but with 100 ns tACC; higher ICC (30 mA) and ISB (200 µA); no A9-based ID code | Acceptable for non-critical timing applications where 70 ns access is not mandatory | Choose AT27C512R-70PC for designs requiring guaranteed 70 ns access, lower power, and ID-driven programming reliability. |
Compared with AT27C512-70PC and MX27C512PC-70, the AT27C512R-70PC uniquely combines 70 ns read timing, 100 µs/byte Rapid™ programming, and electronic ID code - making it the only option supporting fully automated, high-yield OTP programming in volume manufacturing.
Availability
AT27C512R-70PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot ROM, and automotive instrument cluster memory requiring stable component supply across extended product lifecycles.
Supply support for AT27C512R-70PC 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 memory products, including process-controlled wafer fabrication and long-term obsolescence management.
The AT27C512R-70PC belongs to Atmel's 27C512R OTP EPROM family, designed specifically for cost-sensitive, high-reliability firmware storage in industrial, automotive, and test equipment where reprogrammability is unnecessary and data integrity is paramount.
FAQ
What is the maximum read access time specified for AT27C512R-70PC?
The AT27C512R-70PC has a maximum address-to-output delay (tACC) of 70 ns under industrial temperature conditions (-40°C to +85°C) and 5V ±10% supply. This value is guaranteed across the full operating range and is measured with CE and OE/VPP both asserted low. The "-70" suffix in the part number explicitly denotes this 70 ns speed grade, distinguishing it from faster (e.g., -45) or slower (e.g., -90) variants of the AT27C512R-70PC.
Does AT27C512R-70PC support in-system programming?
No, the AT27C512R-70PC is a one-time programmable (OTP) EPROM and does not support in-system programming. Programming requires a dedicated EPROM programmer applying 13.0 V to the OE/VPP pin and 6.5 V to VCC while asserting CE low for 100 µs pulses. Once programmed, data cannot be erased or rewritten - the device is intended for final firmware image storage after full validation, not iterative development.
What package type is used for AT27C512R-70PC?
The AT27C512R-70PC uses a 28-lead, 0.600" wide plastic dual-inline package (PDIP), designated as package code "28P6" per Atmel's ordering information. This JEDEC MS-011 AB compliant through-hole package features 0.100" lead pitch and is optimized for wave soldering and manual prototyping. It is distinct from PLCC (32J), SOIC (28R), and TSOP (28T) variants of the same device.
How does the integrated product identification code function in AT27C512R-70PC?
The AT27C512R-70PC implements an electronic product ID code accessible by setting A9 to 12.0 V ±0.5 V (VID) while holding A1–A15 low and toggling A0 between low and high. This returns Manufacturer ID 0x1E and Device Code 0x0D on O7–O0. The feature enables industry-standard programmers to auto-detect the device and select correct algorithms/voltages - eliminating manual setup errors during high-volume programming of AT27C512R-70PC.
What is the standby current specification for AT27C512R-70PC?
The AT27C512R-70PC specifies a maximum standby current (ISB) of 100 µA when CE is held high (VIH), measured under CMOS-compatible input conditions. This value applies across the full industrial temperature range (-40°C to +85°C) and 5V ±10% supply. The low ISB enables energy-efficient operation in battery-backed or always-on systems where the EPROM spends extended periods in inactive state.
AT27C512R-70PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-DIP (0.600", 15.24mm)
- 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 28-PDIP
AT27C512R-70PC FAQ
1.How can I place an order for AT27C512R-70PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-70PC 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-70PC reliable?
The price and inventory of AT27C512R-70PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-70PC is usually 5 days.
3.What payment methods are accepted for AT27C512R-70PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-70PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-70PC?
AT27C512R-70PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-70PC 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-70PC?
For technical support, including AT27C512R-70PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-70PC requirements.
6.How does Aetrix verify that AT27C512R-70PC is sourced from the original manufacturer or authorized distributors?
All AT27C512R-70PC 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-70PC meets industry standards.
7.What is the process for return or replacement of AT27C512R-70PC?
All AT27C512R-70PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-70PC, 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-70PC part is unused and in its original packaging.
Return procedure for AT27C512R-70PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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