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Microchip Technology AT27C512R-90JC
- Part No.:
- AT27C512R-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-90JC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,689
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Product details
Overview
AT27C512R-90JC from Microchip Technology (formerly Atmel) is a 512 Kbit (64K × 8) one-time programmable EPROM used for non-volatile firmware storage in embedded microcontroller systems. It operates on a single 5V ±10% supply, delivers 45 ns read access time, supports commercial temperature range (0°C to 70°C), and uses JEDEC-standard 28-lead plastic DIP (PDIP) packaging.
For engineers reviewing the AT27C512R-90JC datasheet, AT27C512R-90JC pinout, AT27C512R-90JC application, or AT27C512R-90JC equivalent, key selection considerations include its 45 ns tACC timing grade, CMOS/TTL-compatible I/O, rapid 100 µs/byte programming algorithm, and dual-line control (CE/OE) architecture for bus contention avoidance in legacy 8-bit and 16-bit systems.
Technical Context
The AT27C512R-90JC implements a parallel-addressed OTP EPROM architecture with 16 address inputs (A0–A15), 8 bidirectional data outputs (O0–O7), and two active-low control lines: Chip Enable (CE) and Output Enable/VPP. Its read operation requires only VCC = 5V ±10%; programming requires elevated VPP = 13.0V and VCC = 6.5V.
It features integrated product identification (manufacturer code 0x1E, device code 0x0D), 2,000V ESD protection, and 200 mA latchup immunity. The Rapid™ Programming Algorithm enables byte-level programming with 100 µs pulse width and automatic verify-reprogram loops - critical for high-yield production programming of firmware images.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8) - supports full 16-bit address space for boot code or configuration tables |
| Read Access Time (tACC) | 90 ns max - compatible with 11 MHz CPU bus cycles without wait states |
| VCC Supply | 5V ±10% - eliminates need for auxiliary voltage rails in legacy 5V systems |
| Active Current (ICC) | 20 mA max at 5 MHz - enables low-power operation in battery-backed or energy-constrained designs |
| Standby Current (ISB) | 100 µA max - reduces quiescent power during system sleep modes |
| Programming Voltage (VPP) | 13.0 V ±0.25 V - requires dedicated programming hardware; not used during normal read operation |
| ESD Protection | 2,000 V HBM - ensures robustness during handling and board assembly |
Pinout & Package
AT27C512R-90JC is packaged in a 28-lead, 0.600" wide plastic dual in-line package (PDIP), per JEDEC MS-011 AB standard. Pin 1 is index-marked; pins are numbered counter-clockwise from top-left corner when viewed from top with notch up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit parallel address bus interface; latched internally on CE assertion |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus; high-impedance when CE or OE is high |
| CE | Chip Enable | Active-low global enable; disables outputs and reduces current to standby level when high |
| OE/VPP | Output Enable / Programming Voltage | Active-low output gate during read; supplies 13 V programming voltage during write mode |
| VCC | Power Supply | +5V supply input; must be applied simultaneously with or before OE/VPP |
| GND | Ground | Reference return path for all signals and power; decoupling capacitor required |
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/VH and A0 toggle - enables automated programmer validation and BOM traceability |
| Dual-Line Control Architecture | Separate CE and OE inputs - allows precise timing control to prevent bus contention in multi-device memory maps |
| CMOS/TTL Compatibility | VIL ≤ 0.8 V, VIH ≥ 2.0 V, VOL ≤ 0.4 V, VOH ≥ 2.4 V - interoperable with both logic families without level-shifting |
| High-Reliability Process | 2,000 V HBM ESD rating and 200 mA latchup immunity - suitable for industrial environments with noisy power or handling exposure |
Applications
| Industrial PLC Firmware Storage | Legacy Automotive ECU Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping firmware in programmable logic controllers requiring long-term data retention without battery backup. IC Role / Device Role / Timing Role: Non-volatile boot ROM providing immediate instruction fetch upon power-up; accessed via 16-bit parallel bus with no wait states at 11 MHz. Use Value: 90 ns tACC ensures deterministic execution startup; OTP architecture prevents accidental overwrite during field operation. | Use Scenario: Holding calibration constants and engine control algorithms in pre-OBD-II automotive ECUs where firmware updates are performed only at service centers. IC Role / Device Role / Timing Role: Read-only memory mapped into microcontroller address space; CE and OE controlled by dedicated address decoder logic. Use Value: 13 V VPP programming interface enables secure, one-time factory programming; 0°C to 70°C rating matches under-hood ambient constraints. |
| Medical Device Configuration Memory | Avionics System Bootloader Storage |
Use Scenario: Retaining device-specific calibration coefficients and safety-critical initialization parameters in Class II medical instruments with regulatory traceability requirements. IC Role / Device Role / Timing Role: Static configuration store accessed during power-on self-test (POST); isolated from volatile RAM and flash update paths. Use Value: Integrated product ID code (0x1E/0x0D) provides auditable manufacturer and part verification during manufacturing test. | Use Scenario: Hosting immutable bootloader code in legacy avionics subsystems where DO-254 compliance mandates deterministic, unalterable startup sequences. IC Role / Device Role / Timing Role: Fixed-function ROM interfaced to MIL-STD-1553 or ARINC-429 controller via address/data bus; CE asserted only during boot phase. Use Value: 100 µA max standby current minimizes parasitic drain on aircraft battery during extended ground idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C512-90DC | Same 512 Kbit (64K × 8) OTP EPROM, 90 ns access, 28-pin PDIP, but manufactured by AMD (now discontinued); requires identical 13 V VPP programming voltage | No integrated product ID code; lacks Rapid™ programming algorithm - longer programming time (~500 µs/byte) | Use only if legacy AM27C512-90DC inventory exists; not recommended for new designs due to obsolescence and lack of ID verification |
| MX27C512-90PC | Macronix 512 Kbit OTP EPROM, 90 ns access, 28-pin PDIP; same 5V/13V dual-supply requirement and pinout | Higher standby current (200 µA vs. 100 µA); no documented product ID feature; programming algorithm unspecified in public datasheet | Suitable for cost-sensitive replacements where ID code and ultra-low standby are non-critical; verify programming equipment compatibility prior to adoption |
Compared with AM27C512-90DC and MX27C512-90PC, the AT27C512R-90JC offers faster programming (100 µs/byte), lower standby current (100 µA), and built-in electronic ID for traceability - making it preferred for new production runs requiring reliability, auditability, and process efficiency.
Availability
AT27C512R-90JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy automotive ECU boot ROM, and medical device configuration memory requiring stable component supply across extended product lifecycles.
Supply support for AT27C512R-90JC 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 technical and supply chain support for legacy Atmel memory products including the AT27C512R series.
The AT27C512R product line was designed specifically for reliable, low-cost, one-time programmable firmware storage in 5V-based 8/16-bit embedded systems where EEPROM endurance or flash reprogrammability were unnecessary.
FAQ
What is the maximum operating temperature range for the AT27C512R-90JC?
The AT27C512R-90JC is rated for commercial temperature operation from 0°C to 70°C. This is confirmed by the "JC" suffix in the ordering code, where "J" denotes the 28-lead PDIP package and "C" specifies the commercial temperature grade. It is not rated for industrial (−40°C to +85°C) or automotive (−40°C to +125°C) ranges - those variants use suffixes like "JI", "TI", or "JA". The AT27C512R-90JC must be used within this defined thermal envelope to guarantee 90 ns access time and electrical specifications.
Does the AT27C512R-90JC require a separate programming voltage during normal read operation?
No, the AT27C512R-90JC requires only a single 5V ±10% supply (VCC) for normal read operation. The OE/VPP pin serves dual functions: as Output Enable (active-low) during read mode, and as the 13.0 V programming voltage input during programming. During read, OE/VPP is driven to VIL (≤0.8 V); VPP is never present on the pin unless the device is actively being programmed. Therefore, standard 5V system logic can safely interface with the AT27C512R-90JC without voltage translation.
Can the AT27C512R-90JC be used as a direct replacement for the older AT27C512-90JC?
Yes, the AT27C512R-90JC is a revised version of the AT27C512-90JC with identical pinout, timing, and electrical specifications - the "R" suffix indicates an updated revision with enhanced reliability features including improved ESD protection (2,000 V HBM) and latchup immunity (200 mA). All AC/DC parameters, package dimensions, and functional behavior remain fully compatible. The AT27C512R-90JC may be substituted without PCB or firmware changes in existing AT27C512-90JC designs.
What decoupling capacitors are required for stable operation of the AT27C512R-90JC?
The AT27C512R-90JC requires two decoupling capacitors: a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND as close as possible to the device's pins, and a 4.7 µF bulk electrolytic capacitor located near the power entry point of the EPROM array. These values are specified in the "System Considerations" section of the datasheet to suppress transient voltage excursions during CE switching and stabilize supply rail integrity across multiple devices. Omitting either capacitor risks non-conformance to timing or logic-level specifications.
How is the Integrated Product Identification Code accessed on the AT27C512R-90JC?
The Integrated Product Identification Code on the AT27C512R-90JC is accessed by asserting CE = VIL and OE/VPP = VIL while setting A9 = 12.0 V ±0.5 V (VH) and toggling A0 between VIL and VIH - all other address lines (A1–A15) held low. When A0 = VIL, the Manufacturer ID byte (0x1E) appears on O7–O0; when A0 = VIH, the Device Code byte (0x0D) is output. This feature is used by industry-standard programmers to auto-detect and validate the AT27C512R-90JC before initiating programming.
AT27C512R-90JC 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:
- 90 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27C512R-90JC FAQ
1.How can I place an order for AT27C512R-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-90JC 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-90JC reliable?
The price and inventory of AT27C512R-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-90JC is usually 5 days.
3.What payment methods are accepted for AT27C512R-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-90JC?
AT27C512R-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-90JC 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-90JC?
For technical support, including AT27C512R-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-90JC requirements.
6.How does Aetrix verify that AT27C512R-90JC is sourced from the original manufacturer or authorized distributors?
All AT27C512R-90JC 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-90JC meets industry standards.
7.What is the process for return or replacement of AT27C512R-90JC?
All AT27C512R-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-90JC, 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-90JC part is unused and in its original packaging.
Return procedure for AT27C512R-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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