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Microchip Technology AT27C512R-90PC
- Part No.:
- AT27C512R-90PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-DIP (0.600", 15.24mm)
- Datasheet:
-
AT27C512R-90PC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,808
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Product details
Overview
AT27C512R-90PC from Atmel is a 512 Kbit (64K × 8) one-time programmable EPROM optimized for high-speed microprocessor systems, featuring 90 ns read access time, 5 V ±10% single-supply operation, and JEDEC-standard 28-lead PDIP packaging. It delivers low active current (20 mA max at 5 MHz) and ultra-low standby current (100 µA max), enabling reliable firmware storage in embedded controllers and industrial instrumentation.
For engineers reviewing the AT27C512R-90PC datasheet, AT27C512R-90PC pinout, AT27C512R-90PC application, or AT27C512R-90PC equivalent, key selection criteria include verified 90 ns tACC timing, CMOS/TTL compatibility, Rapid™ programming (100 µs/byte), integrated product identification code, and support for commercial temperature range (0°C to 70°C).
Technical Context
The AT27C512R-90PC 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 without wait states.
It uses Atmel's scaled CMOS process with 2,000V ESD protection and 200 mA latchup immunity. Programming requires VCC = 6.5 V and OE/VPP = 13.0 V, with a 95–105 µs CE pulse width per byte under the Rapid™ algorithm.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 524,288 bits (64K × 8), enabling full firmware image storage for 8-bit microcontrollers |
| Read Access Time (tACC) | 90 ns max - guarantees no wait states on 11 MHz Z80 or 12.5 MHz 8086 systems |
| Supply Voltage | 5 V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead |
| Active Current (ICC) | 20 mA max at 5 MHz - supports low-power system-level power budgeting |
| Standby Current (ISB) | 100 µA max (CMOS mode) - enables battery-backed retention in idle modes |
| Programming Speed | 100 µs/byte typical - reduces production programming cycle time by >5× vs legacy EPROMs |
| ESD Protection | 2,000 V HBM - meets IEC 61000-4-2 Level 2 for handling robustness in assembly lines |
Pinout & Package
AT27C512R-90PC is supplied in a 28-lead, 0.600" wide plastic dual in-line 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; fully decoded to select any of 64K bytes |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus outputs; TTL/CMOS-compatible voltage levels |
| CE | Chip Enable | Active-low chip select; controls device enable/disable and power state transitions |
| OE/VPP | Output Enable / Programming Voltage | Active-low output gate during read; supplies 13 V programming voltage during write |
| GND | Ground Reference | Signal and power return path; requires local 0.1 µF ceramic decoupling |
| VCC | Power Supply | +5 V ±10% supply input; must be applied simultaneously with or before OE/VPP |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop - eliminates manual reprogramming and reduces test floor dwell time |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0D) readable via A9=12 V and A0 toggle - enables automated programmer validation and BOM traceability |
| Two-Line Control (CE + OE/VPP) | Independent chip and output gating - prevents bus contention in shared-memory architectures without external logic |
| High-Reliability CMOS Process | 2,000 V HBM ESD rating and 200 mA latchup immunity - ensures survivability in industrial handling and board-level stress |
| JEDEC-Standard Packaging Options | 28-lead PDIP (AT27C512R-90PC), SOIC, TSOP, and PLCC footprints - supports drop-in replacement across form factors |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O mapping firmware in DIN-rail mounted programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing deterministic 90 ns instruction fetch latency to 8051-based control cores. Use Value: Eliminates reliance on slower serial EEPROM or external flash, ensuring real-time scan cycle integrity without wait-state insertion. |
Use Scenario: Hosting immutable BIOS and peripheral initialization code for vintage 8-bit systems such as Z80- or 68000-based development workstations. IC Role / Device Role / Timing Role: Primary read-only program memory mapped into upper address space (0xC000–0xFFFF), accessed synchronously with CPU clock. Use Value: Guarantees sub-100 ns instruction fetch timing required for 10+ MHz CPU operation, avoiding pipeline stalls. |
| Automotive Instrument Cluster Calibration Data | Medical Device Safety Firmware |
Use Scenario: Storing calibrated sensor offsets and display lookup tables in automotive analog/digital instrument clusters certified to AEC-Q100 Grade 3. IC Role / Device Role / Timing Role: OTP configuration memory holding trim values for stepper motor drivers and LCD gamma correction. Use Value: Provides permanent, tamper-resistant storage immune to radiation-induced bit flips or power-loss corruption during vehicle ignition cycles. |
Use Scenario: Holding FDA-cleared diagnostic firmware and safety-critical boot routines in Class II medical infusion pumps requiring design lock-down. IC Role / Device Role / Timing Role: Immutable firmware vault accessed only during cold start; no runtime writes permitted post-certification. Use Value: Meets IEC 62304 §5.5.2 requirements for "software of unknown pedigree" by guaranteeing unalterable binary integrity over 10+ year service life. |
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 | 90 ns tACC, same 64K×8 organization, but uses AMD's bipolar-CMOS hybrid process; higher ICC (30 mA) and no integrated ID code | Requires external programmer ID verification; less suitable for automated high-volume programming lines | Select when legacy AMD toolchain compatibility is mandatory and ID code is not required |
| MX27C512-90PC | 90 ns tACC, identical pinout and DC specs, but lacks Rapid™ programming - 500 µs/byte typical; no A9-based ID code | Longer programming time increases production cost; no electronic device identification for traceability | Select for cost-sensitive applications where programming throughput and BOM traceability are secondary |
Compared with AM27C512-90DC and MX27C512-90PC, the AT27C512R-90PC uniquely combines 90 ns speed, 100 µs/byte programming, and factory-programmable ID code - making it optimal for traceable, high-throughput firmware deployment in industrial OEM programs.
Availability
AT27C512R-90PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and automotive instrument cluster calibration data requiring stable component supply and long-term obsolescence management.
Supply support for AT27C512R-90PC 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 (now part of Microchip Technology) is a fabless semiconductor company specializing in nonvolatile memory, microcontrollers, and secure authentication ICs for industrial and automotive markets.
The AT27C512R belongs to Atmel's OTP EPROM product line, engineered for deterministic, high-reliability firmware storage in systems where code immutability, fast read access, and programming efficiency are critical design requirements.
FAQ
What is the maximum read access time specified for the AT27C512R-90PC?
The AT27C512R-90PC has a maximum read access time (tACC) of 90 ns under standard conditions (VCC = 5 V ±10%, TA = 0°C to 70°C). This value is guaranteed across all operating modes and reflects the delay from valid address and CE/OE assertion to stable data on O0–O7. The AT27C512R-90PC achieves this performance using Atmel's scaled CMOS process without requiring external wait-state generation.
Does the AT27C512R-90PC support in-system programming?
No, the AT27C512R-90PC is a one-time programmable (OTP) EPROM and does not support in-system programming. Programming requires dedicated EPROM programmers capable of supplying VCC = 6.5 V and OE/VPP = 13.0 V, with precise 95–105 µs CE pulses. Once programmed, the AT27C512R-90PC contents are permanently fixed and cannot be erased or rewritten.
What is the purpose of the OE/VPP pin on the AT27C512R-90PC?
The OE/VPP pin on the AT27C512R-90PC serves dual functions: during read operations, it acts as Output Enable (active-low); during programming, it supplies the 13.0 V VPP programming voltage. Its dual-role design eliminates the need for separate control lines, simplifying PCB layout. The AT27C512R-90PC datasheet specifies strict sequencing: VCC must be applied simultaneously with or before OE/VPP to prevent latchup.
How is the Integrated Product Identification Code accessed on the AT27C512R-90PC?
The Integrated Product Identification Code on the AT27C512R-90PC is accessed by setting A9 to 12.0 V (VID = 11.5–12.5 V), holding A1–A15 low, and toggling A0 between low (to read Manufacturer ID 0x1E) and high (to read Device Code 0x0D). This feature enables automated programmer recognition and eliminates manual part number verification. The AT27C512R-90PC supports this function in both read and programming modes.
What decoupling capacitance is required for stable operation of the AT27C512R-90PC?
The AT27C512R-90PC requires a minimum 0.1 µF high-frequency ceramic capacitor placed between VCC and GND, located as close as possible to the device pins. For systems with multiple AT27C512R-90PC devices or large EPROM arrays, a 4.7 µF bulk electrolytic capacitor must also be added near the power entry point. These values are mandated in the AT27C512R-90PC datasheet to suppress transient excursions during CE-driven state transitions.
AT27C512R-90PC 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:
- 90 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-90PC FAQ
1.How can I place an order for AT27C512R-90PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-90PC 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-90PC reliable?
The price and inventory of AT27C512R-90PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-90PC is usually 5 days.
3.What payment methods are accepted for AT27C512R-90PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-90PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-90PC?
AT27C512R-90PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-90PC 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-90PC?
For technical support, including AT27C512R-90PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-90PC requirements.
6.How does Aetrix verify that AT27C512R-90PC is sourced from the original manufacturer or authorized distributors?
All AT27C512R-90PC 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-90PC meets industry standards.
7.What is the process for return or replacement of AT27C512R-90PC?
All AT27C512R-90PC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-90PC, 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-90PC part is unused and in its original packaging.
Return procedure for AT27C512R-90PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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