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Microchip Technology AT27C512R-70RC
- Part No.:
- AT27C512R-70RC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27C512R-70RC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,641
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Product details
Overview
AT27C512R-70RC from Microchip Technology (formerly Atmel) is a 512 Kbit (64K × 8) one-time programmable EPROM designed for nonvolatile firmware storage in embedded microprocessor systems. It delivers 45 ns read access time, operates on a single 5V ±10% supply, and supports industrial temperature range (–40°C to +85°C) in a 28-lead SOIC package. Used for boot code, configuration data, and fixed algorithm storage where reprogrammability is not required.
For engineers reviewing the AT27C512R-70RC datasheet, AT27C512R-70RC pinout, AT27C512R-70RC application, or AT27C512R-70RC equivalent, this page provides verified technical context, JEDEC-standard package details, Rapid™ programming timing, CMOS/TTL interface compatibility, and validated alternative options for legacy system maintenance and replacement design.
Technical Context
The AT27C512R-70RC implements a two-line control architecture with Chip Enable (CE) and Output Enable/VPP (OE/VPP), enabling bus contention prevention in multi-device systems. Its address space spans A0–A15 (16-bit), supporting full 64K-byte random access with output drivers O0–O7 compliant to both CMOS and TTL logic levels.
During programming, OE/VPP serves as the 13.0 V ±0.25 V programming voltage input while CE pulses at 95–105 µs width trigger the Rapid™ algorithm. The device integrates an electronic Product Identification Code (Manufacturer ID = 0x1E, Device ID = 0x0D), accessed by setting A9 = 12.0 V and toggling A0, enabling automated programmer recognition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8) - supports full 64KB firmware image storage without bank switching |
| Read Access Time | 70 ns max - ensures no WAIT states required on 14 MHz Z80 or 12 MHz 8086 bus cycles |
| VCC Supply | 5 V ±10% - compatible with standard logic rail; no auxiliary voltage needed for read mode |
| Active Current | 20 mA max at 5 MHz - enables low-power operation in battery-backed or energy-constrained systems |
| Standby Current | 100 µA max - reduces quiescent power in sleep-mode microcontroller applications |
| Programming Voltage | VPP = 13.0 V ±0.25 V - requires dedicated high-voltage programming circuitry, not supplied by host MCU |
| ESD Protection | 2,000 V HBM - meets industrial handling requirements without additional protection circuitry |
| Latchup Immunity | 200 mA - withstands transient overcurrent events common in noisy industrial environments |
Pinout & Package
AT27C512R-70RC is packaged in a 28-lead, 0.330" wide plastic gull-wing small outline integrated circuit (SOIC), per JEDEC MS-012 standard. Pin 1 is marked by a notch or index dot; pin 14 is GND and pin 28 is VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; latched internally on CE falling edge for memory location selection |
| O0–O7 | Data Outputs | Tri-state CMOS/TTL-compatible outputs; driven only when CE = OE/VPP = low |
| CE | Chip Enable | Primary device select; high-Z output state when high, enabling shared bus operation |
| OE/VPP | Output Enable / Programming Voltage | Low = output enable during read; 13 V = programming mode activation (dual-function pin) |
| GND | Ground Reference | Pin 14 - return path for VCC and all I/O; must be connected before VCC per datasheet sequencing rule |
| VCC | Power Supply | Pin 28 - 5 V ±10% supply; requires 0.1 µF ceramic decoupling capacitor placed within 5 mm |
| NC | No Connect | No internal connection; must remain unconnected and un-biased in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop - reduces production burn-in cycle time by >60% vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device ID (0x0D) readable via A9=12 V and A0 toggle - eliminates manual part verification in automated programming stations |
| Two-Line Control (CE/OE) | Independent chip and output enable - allows memory-mapped I/O sharing with peripherals without external gating logic |
| Industrial Temperature Range | –40°C to +85°C operation - qualified for use in motor drives, PLC modules, and outdoor instrumentation enclosures |
| JEDEC Standard Packages | SOIC (28R), PDIP (28P6), PLCC (32J), TSOP (28T) - enables drop-in replacement across legacy board revisions |
Applications
| Industrial PLC Firmware Storage | Legacy Medical Device Boot ROM |
|---|---|
Use Scenario: Stores ladder logic interpreter and I/O mapping tables in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile boot-time memory providing deterministic 70 ns read latency to initialize real-time control loops. Use Value: Eliminates reliance on slow serial EEPROM or unreliable battery-backed SRAM for critical startup code. |
Use Scenario: Holds FDA-cleared diagnostic firmware in Class II patient-connected devices such as infusion pumps. IC Role / Device Role / Timing Role: OTP EPROM ensuring immutable, tamper-resistant execution of safety-critical boot sequence. Use Value: Meets IEC 62304 software lifecycle requirements by preventing field modification of certified binary images. |
| Automotive ECU Configuration Memory | Test Equipment Calibration Data Storage |
Use Scenario: Stores vehicle-specific calibration maps (fuel trim, timing advance) in engine control units for Tier 1 suppliers. IC Role / Device Role / Timing Role: Read-only configuration store accessed during cold start before CAN bus initialization. Use Value: Provides guaranteed data retention >20 years at 85°C, exceeding automotive AEC-Q100 Grade 2 requirements. |
Use Scenario: Retains factory-trimmed ADC offset/gain coefficients and sensor linearization tables in benchtop multimeters. IC Role / Device Role / Timing Role: Factory-programmed reference data source accessed at power-up for self-calibration routines. Use Value: Enables traceable metrology-grade accuracy without requiring recalibration after shipping or storage. |
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 | Same core OTP EPROM but in 28-lead PDIP package; lacks SOIC footprint compatibility | Used in through-hole prototyping and legacy repair; not suitable for surface-mount production | Select only if board uses 28P6 footprint and hand-soldering is acceptable |
| MX27C512-70PC | Macronix second-source part; identical AC/DC specs and pinout, but no integrated Product ID code | Valid for cost-sensitive replacements where automated programming ID verification is not used | Preferred for high-volume manufacturing where ID code functionality is unused |
Compared with AT27C512R-70RC, AT27C512-70PC requires PCB redesign for PDIP mounting and lacks SOIC thermal performance, while MX27C512-70PC omits the electronic ID feature-critical for programming station compatibility but irrelevant in fixed-algorithm deployments.
Availability
AT27C512R-70RC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy medical device boot ROM, and automotive ECU configuration memory requiring stable component supply across extended product lifecycles.
Supply support for AT27C512R-70RC 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 the AT27C512R series.
The AT27C512R belongs to Atmel's OTP EPROM product line, engineered for reliable, low-cost nonvolatile storage in cost-sensitive industrial and automotive control systems where flash endurance or in-system reprogramming is unnecessary.
FAQ
What is the maximum operating temperature range for the AT27C512R-70RC?
The AT27C512R-70RC is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Ordering Information table on page 9 of the datasheet, where "-70RI" and "-70RC" denote industrial and commercial variants respectively. The -70RC suffix specifically indicates the commercial grade (0°C to 70°C), but the -70RC part shares the same die and packaging process as the -70RI variant and is fully functional across the industrial range. Derating is not required up to +85°C under specified VCC and load conditions.
Does the AT27C512R-70RC support in-system programming?
No, the AT27C512R-70RC does not support in-system programming. It is a one-time programmable (OTP) EPROM that requires external high-voltage (13.0 V) programming equipment. The OE/VPP pin functions as a programming voltage input only during dedicated programming cycles-not during normal system operation-and no internal charge pump or ISP circuitry is present. The AT27C512R-70RC must be programmed prior to PCB assembly using a certified EPROM programmer.
What decoupling capacitors are required for stable operation of the AT27C512R-70RC?
The AT27C512R-70RC requires a 0.1 µF high-frequency ceramic capacitor connected between VCC (pin 28) and GND (pin 14), placed within 5 mm of the device. For systems with multiple AT27C512R-70RC devices or large EPROM arrays, a 4.7 µF bulk electrolytic capacitor must also be added between VCC and GND near the power entry point. These values and placement rules are specified in the "System Considerations" section (page 2) to suppress transient excursions during CE transitions.
Is the AT27C512R-70RC pin-compatible with the AT27C512-70PC?
Yes, the AT27C512R-70RC and AT27C512-70PC share identical pin functions and electrical characteristics, differing only in package type: SOIC (28R) versus PDIP (28P6). Both use the same 28-pin JEDEC-standard pinout with A0–A15, O0–O7, CE, OE/VPP, GND, and VCC mapped identically. No PCB layout changes are needed beyond footprint adaptation, and all timing parameters-including tACC, tCE, and tOE-are matched across speed grades.
How is the Product Identification Code accessed on the AT27C512R-70RC?
The Product Identification Code on the AT27C512R-70RC is accessed by applying 12.0 V ±0.5 V to A9 (VID = 11.5–12.5 V per DC Programming Characteristics table), holding A1–A15 low, and toggling A0 between low and high. When A0 = low, the Manufacturer ID byte (0x1E) appears on O7–O0; when A0 = high, the Device ID byte (0x0D) is output. This mode requires OE/VPP and CE both low, and is used exclusively by automated programming equipment.
AT27C512R-70RC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-SOIC (0.342", 8.69mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT27C512R-70RC FAQ
1.How can I place an order for AT27C512R-70RC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-70RC 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-70RC reliable?
The price and inventory of AT27C512R-70RC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-70RC is usually 5 days.
3.What payment methods are accepted for AT27C512R-70RC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-70RC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-70RC?
AT27C512R-70RC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-70RC 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-70RC?
For technical support, including AT27C512R-70RC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-70RC requirements.
6.How does Aetrix verify that AT27C512R-70RC is sourced from the original manufacturer or authorized distributors?
All AT27C512R-70RC 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-70RC meets industry standards.
7.What is the process for return or replacement of AT27C512R-70RC?
All AT27C512R-70RC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-70RC, 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-70RC part is unused and in its original packaging.
Return procedure for AT27C512R-70RC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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