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Microchip Technology AT27C512R-90RC
- Part No.:
- AT27C512R-90RC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT27C512R-90RC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,473
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Product details
Overview
AT27C512R-90RC from Microchip Technology (formerly Atmel) is a 64K × 8-bit one-time programmable EPROM used for nonvolatile firmware storage in microprocessor systems. It delivers 45 ns read access time, operates from a single 5V ±10% supply, and supports industrial temperature range (–40°C to +85°C) in a 28-lead SOIC package.
For engineers reviewing the AT27C512R-90RC datasheet, AT27C512R-90RC pinout, AT27C512R-90RC application, or AT27C512R-90RC equivalent, key selection criteria include verified 90 ns tACC timing grade, CMOS/TTL compatibility, Rapid™ programming at 100 µs/byte, and JEDEC-standard SOIC packaging with dual-line control (CE/OE).
Technical Context
The AT27C512R-90RC implements a standard OTP EPROM architecture with address decoding for A0–A15 and 8-bit bidirectional data outputs O0–O7. Its two-line control interface (CE and OE/VPP) enables bus contention avoidance in shared-memory systems.
It uses scaled CMOS technology for low power: 100 µA max standby current and 20 mA max active current at 5 MHz. Programming requires VCC = 6.5 V and OE/VPP = 13.0 V, with a 100 µs CE pulse width per byte under the Rapid™ algorithm.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288-bit (64K × 8) OTP EPROM - fixed firmware storage without re-erasure capability |
| Read Access Time (tACC) | 90 ns maximum - ensures compatibility with 11 MHz microprocessor buses without wait states |
| Supply Voltage | 5V ±10% - single-rail operation eliminates need for auxiliary voltage regulators |
| Standby Current | 100 µA max - enables low-power hold mode during system sleep or idle cycles |
| Active Current | 20 mA max at 5 MHz - supports sustained read throughput in embedded controllers |
| ESD Protection | 2,000V HBM - meets industrial handling requirements without external protection circuitry |
| Latchup Immunity | 200 mA - prevents destructive latchup under transient overvoltage conditions |
Pinout & Package
AT27C512R-90RC is packaged in a 28-lead SOIC (package code "28R"), 0.330" wide, JEDEC MS-012 compliant. Pin 1 is index-marked; pins are gull-wing surface-mount terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; selects one of 65,536 memory locations |
| O0–O7 | Data Outputs | 8-bit parallel data bus; tri-stated when CE or OE is high |
| CE | Chip Enable | Active-low chip select; disables outputs and reduces current draw when high |
| OE/VPP | Output Enable / Programming Voltage | Active-low output enable in read mode; supplies 13.0 V programming voltage during write |
| GND | Ground | Reference return path for all signals and power rails |
| VCC | Power Supply | +5V ±10% supply input; must be applied before/with OE/VPP during programming |
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 Identification Code | Manufacturer ID (0x1E) and Device Code (0x0D) readable via A9/A0 toggling - enables automated programmer validation and BOM traceability |
| Two-Line Control Architecture | Dedicated CE and OE/VPP pins - allows independent control of chip selection and output gating to prevent bus conflicts |
| CMOS/TTL Compatibility | VIL ≤ 0.8 V, VIH ≥ 2.0 V, VOL ≤ 0.4 V, VOH ≥ 2.4 V - interoperates directly with both logic families without level-shifting |
| Industrial Temperature Range | –40°C to +85°C operation - qualified for use in motor control, PLC, and factory automation environments |
Applications
| Industrial PLC Firmware Storage | Automotive ECU Boot Code |
|---|---|
Use Scenario: Storing immutable boot firmware and configuration tables in programmable logic controllers deployed in manufacturing lines. IC Role / Device Role / Timing Role: Nonvolatile program memory providing deterministic 90 ns read access to instruction fetch paths of 8/16-bit MCUs. Use Value: Eliminates reliance on slower serial EEPROM or flash; avoids WAIT-state insertion in real-time scan cycles. | Use Scenario: Holding calibrated sensor lookup tables and safety-critical startup routines in engine control units. IC Role / Device Role / Timing Role: OTP EPROM serving as tamper-resistant, radiation-tolerant boot ROM with guaranteed data retention over 20 years. Use Value: Meets AEC-Q100 Grade 2 requirements via industrial temp rating and 200 mA latchup immunity. |
| Medical Device Calibration Data | Legacy Industrial Instrumentation |
Use Scenario: Archiving factory-calibrated ADC/DAC coefficients and safety interlock parameters in Class II medical analyzers. IC Role / Device Role / Timing Role: Secure, unalterable memory element storing regulatory-compliant calibration constants accessed at power-up. Use Value: Prevents field modification of certified calibration data; supports ISO 13485 traceability via integrated ID code. | Use Scenario: Replacing obsolete 27C512 variants in aging test equipment and CNC motion controllers. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement for legacy EPROMs requiring no PCB redesign or timing recalibration. Use Value: Maintains system uptime during component obsolescence; leverages identical SOIC footprint and AC timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512-90RC | No integrated product identification code; lacks Rapid™ programming support; 100 µs/byte programming not guaranteed | Same memory size and SOIC package but lacks ID code verification and optimized programming flow | Select AT27C512R-90RC when automated programming validation or production line traceability is required. |
| MX27C512PC-90 | 90 ns tACC, 5V-only operation, but no OE/VPP dual-function pin; separate VPP pin required for programming | Requires external 12.5 V programming supply and modified socket layout; no integrated ID code | Choose AT27C512R-90RC for simplified programming infrastructure and reduced board-level complexity. |
Compared with AT27C512-90RC and MX27C512PC-90, the AT27C512R-90RC uniquely combines integrated ID coding, Rapid™ programming, and dual-function OE/VPP in a drop-in SOIC package-enabling faster production programming, stronger BOM traceability, and lower system integration overhead.
Availability
AT27C512R-90RC is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, medical calibration modules, and legacy instrumentation requiring stable component supply across extended lifecycles.
Supply support for AT27C512R-90RC 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 product support, qualification, and manufacturing continuity for the AT27C512R family.
The AT27C512R belongs to Atmel's legacy OTP EPROM product line, designed specifically for reliable, low-cost, nonvolatile firmware and calibration data storage in cost-sensitive industrial and automotive systems.
FAQ
What is the maximum read access time specified for AT27C512R-90RC?
The AT27C512R-90RC has a maximum address-to-output delay (tACC) of 90 ns under standard read conditions (CE = OE = VIL, VCC = 5V ±10%, TA = –40°C to +85°C). This value is guaranteed across the full industrial temperature range and defines the device's speed grade - distinct from faster variants like the -45RC (45 ns) or slower -120RC (120 ns).
Does AT27C512R-90RC support in-system programming?
No, AT27C512R-90RC does not support in-system programming. It is a one-time programmable (OTP) EPROM requiring UV-erasable or dedicated EPROM programmers with 13.0 V OE/VPP and 6.5 V VCC during programming. The device lacks internal charge pumps or ISP interfaces, and programming must occur in a socketed or dedicated programmer environment prior to system integration.
What is the function of the OE/VPP pin on AT27C512R-90RC?
The OE/VPP pin on AT27C512R-90RC serves a dual role: during normal read operation, it functions as Output Enable (active-low); during programming, it accepts 13.0 V ±0.25 V as the VPP programming voltage. This dual functionality eliminates the need for a separate VPP pin, simplifying PCB layout and socket design while maintaining full JEDEC-compatibility for OTP EPROM programmers.
Can AT27C512R-90RC operate reliably at 5.5 V supply?
Yes, AT27C512R-90RC is rated for 5V ±10%, meaning it supports operation from 4.5 V to 5.5 V. All DC and AC specifications - including 90 ns tACC, 100 µA standby current, and TTL/CMOS compatibility - are guaranteed across this full voltage range at industrial temperatures. Operation above 5.5 V violates Absolute Maximum Ratings and may cause permanent damage.
How is the Integrated Product Identification Code accessed on AT27C512R-90RC?
The Integrated Product Identification Code on AT27C512R-90RC is accessed by holding A1–A15 low, setting A9 to 12.0 V ±0.5 V (VID), and toggling A0: low reads the Manufacturer ID (0x1E), high reads the Device Code (0x0D). This two-byte code is electrically readable by industry-standard programmers and provides automated device verification without requiring external labeling or manual BOM cross-checks.
AT27C512R-90RC 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:
- 90 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-90RC FAQ
1.How can I place an order for AT27C512R-90RC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-90RC 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-90RC reliable?
The price and inventory of AT27C512R-90RC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-90RC is usually 5 days.
3.What payment methods are accepted for AT27C512R-90RC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-90RC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-90RC?
AT27C512R-90RC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-90RC 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-90RC?
For technical support, including AT27C512R-90RC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-90RC requirements.
6.How does Aetrix verify that AT27C512R-90RC is sourced from the original manufacturer or authorized distributors?
All AT27C512R-90RC 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-90RC meets industry standards.
7.What is the process for return or replacement of AT27C512R-90RC?
All AT27C512R-90RC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-90RC, 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-90RC part is unused and in its original packaging.
Return procedure for AT27C512R-90RC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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