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Microchip Technology AT27C512R-55JC
- Part No.:
- AT27C512R-55JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C512R-55JC.pdf
- Description:
- IC EPROM 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,432
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Product details
Overview
AT27C512R-55JC from Atmel is a 64K × 8-bit one-time programmable EPROM (OTP EPROM) with 512 Kbit capacity, 55 ns maximum read access time, 5 V ±10% supply operation, and JEDEC-standard 28-lead 600-mil PDIP package. It serves as nonvolatile firmware storage in microprocessor systems requiring fast, reliable code access without wait states.
For engineers reviewing the AT27C512R-55JC datasheet, AT27C512R-55JC pinout, AT27C512R-55JC application, or AT27C512R-55JC equivalent, key selection considerations include its 55 ns read timing, 100 µA max standby current, CMOS/TTL compatibility, Rapid™ programming algorithm (100 µs/byte), and support for commercial temperature range (0°C to 70°C).
Technical Context
The AT27C512R-55JC implements a two-line control architecture using Chip Enable (CE) and Output Enable/VPP (OE/VPP) to manage bus contention and enable flexible memory mapping. Its internal address decoding supports full 16-bit addressing (A0–A15) for 64K-byte access, with outputs O0–O7 directly driving TTL/CMOS loads.
Programming uses a dedicated 13.0 V VPP level applied to OE/VPP, while VCC is raised to 6.5 V during rapid programming cycles. 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 bits (64K × 8), sufficient for boot code or fixed firmware in 8-bit microcontroller systems |
| Read Access Time | 55 ns max - enables direct interface with 12–18 MHz microprocessors without wait-state insertion |
| VCC Supply | 5 V ±10% - compatible with standard logic rails; no auxiliary voltage required for read mode |
| Standby Current | 100 µA max - minimizes power draw in idle states for battery-backed or low-power embedded systems |
| Active Current | 20 mA max at 5 MHz - supports sustained read bursts without thermal derating in compact PCB layouts |
| ESD Protection | 2,000 V HBM - enhances robustness during handling and board assembly in industrial environments |
| Latchup Immunity | 200 mA - prevents destructive latchup under transient overvoltage or ground bounce conditions |
Pinout & Package
AT27C512R-55JC is supplied in a 28-lead, 0.600" wide plastic dual in-line package (PDIP), per JEDEC MS-011 AB standard. Pin 1 is marked by a notch or dot; leads are spaced 0.100" (2.54 mm) apart.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus interface; fully decoded to select one of 64K bytes; TTL/CMOS compatible thresholds |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus outputs; drive TTL loads directly; high-impedance when CE or OE/VPP inactive |
| CE | Chip Enable | Active-low global chip select; enables internal circuitry and output drivers only when asserted |
| OE/VPP | Output Enable / Programming Voltage | Active-low output gate in read mode; supplies 12–13 V programming voltage to internal cells during OTP write |
| GND | Ground Reference | Primary signal and power return; requires local 0.1 µF ceramic decoupling per device |
| VCC | Power Supply | +5 V ±10% main supply; must be applied simultaneously with or before OE/VPP to prevent latchup |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time - reduces production burn-in cycle time by >90% vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer ID (0x1E) and Device Code (0x0D) readable via A9=12V and A0 toggle - enables automated programmer validation |
| Two-Line Control (CE + OE/VPP) | Independent enable logic eliminates bus contention in multi-chip memory maps without external gating logic |
| Commercial Temperature Range | 0°C to 70°C operation - qualified for office, lab, and non-harsh industrial control applications |
| JEDEC Standard Packages | PDIP, PLCC, SOIC, TSOP options - allows drop-in replacement across form factors without redesign |
Applications
| Embedded Boot Memory | Industrial PLC Firmware Storage |
|---|---|
|
Use Scenario: Storing boot loader and initialization code for 8-bit microcontrollers in factory automation controllers. IC Role / Device Role / Timing Role: Nonvolatile instruction ROM providing deterministic startup sequence with sub-60 ns fetch latency. Use Value: Eliminates reliance on slow serial EEPROM or external flash, reducing boot time by up to 40% in cycle-critical motion control systems. |
Use Scenario: Holding configuration tables and ladder logic firmware in programmable logic controllers deployed in manufacturing lines. IC Role / Device Role / Timing Role: OTP firmware repository accessed via parallel bus during cold start and firmware update verification. Use Value: Ensures firmware integrity against accidental overwrite; 2,000 V ESD rating sustains reliability in electrically noisy plant-floor environments. |
| Legacy System Replacement | Test Equipment Calibration Data |
|
Use Scenario: Direct replacement for obsolete 27C512 variants in medical diagnostic instruments requiring long-term component availability. IC Role / Device Role / Timing Role: Pin-compatible OTP EPROM delivering identical timing and voltage interface to legacy designs. Use Value: Enables life-extension of certified Class II medical devices without requalification, leveraging same JEDEC PDIP footprint and AC specs. |
Use Scenario: Storing factory-calibrated coefficients and sensor linearization tables in benchtop multimeters and oscilloscopes. IC Role / Device Role / Timing Role: Read-only calibration memory accessed once at power-up to configure ADC reference and gain settings. Use Value: Guarantees calibration permanence-no risk of corruption from power loss or software error, unlike volatile or reprogrammable alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C512R-55PC | Same die, identical AC/DC specs, but in 28-lead SOIC (28R) package - 0.330" width, gull-wing leads | Preferred for surface-mount production; requires reflow-compatible PCB layout and no through-hole drilling | Select AT27C512R-55PC for automated SMT assembly; AT27C512R-55JC remains optimal for prototyping, repair, or through-hole legacy boards. |
| AM27C512-55DC | AMD variant with 55 ns access, same 64K×8 organization, but higher 2 mA max standby current and no integrated ID code | Lacks Rapid™ programming and electronic identification - requires manual algorithm setup in programmers | Choose AM27C512-55DC only if existing tooling mandates AMD part numbers; AT27C512R-55JC offers superior programming efficiency and traceability. |
Compared with AT27C512R-55PC, the AT27C512R-55JC provides identical electrical performance in a through-hole PDIP package ideal for breadboarding and field repair, while AM27C512-55DC trades programmability features for second-source availability without ID-code or rapid-algorithm support.
Availability
AT27C512R-55JC is available at Aetrix Electronics and suitable for embedded boot memory, industrial PLC firmware storage, and legacy system replacement requiring stable component supply and long-term obsolescence management.
Supply support for AT27C512R-55JC 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 microcontrollers, nonvolatile memory, and secure authentication ICs.
The AT27C512R product line delivers high-reliability OTP EPROMs optimized for firmware storage in cost-sensitive, long-lifecycle industrial and instrumentation applications where data permanence and read speed are critical.
FAQ
What is the operating temperature range for the AT27C512R-55JC?
The AT27C512R-55JC is rated for commercial temperature operation from 0°C to 70°C. This range is validated per the datasheet's DC and AC operating conditions table and applies specifically to the -55JC suffix variant. It is not qualified for industrial (-40°C to +85°C) or automotive (-40°C to +125°C) ranges - those require suffixes like -55JI or -55JA.
Does the AT27C512R-55JC require a programming voltage during normal read operation?
No, the AT27C512R-55JC operates from a single 5 V ±10% supply during read mode. The OE/VPP pin functions solely as Output Enable (active-low) in this state. Programming voltage (12–13 V) is applied only during OTP programming cycles and is not present or required during system runtime or firmware execution.
Can the AT27C512R-55JC be used as a direct replacement for older 27C512 EPROMs?
Yes, the AT27C512R-55JC is functionally and pinout-compatible with standard 27C512 devices in PDIP packages, including identical address/data bus mapping, CE/OE control, and 5 V read operation. However, its Rapid™ programming algorithm and integrated ID code require compatible programmers - legacy units may need firmware updates to recognize these features.
What decoupling capacitance is recommended for the AT27C512R-55JC?
A 0.1 µF high-frequency ceramic capacitor must be placed between VCC and GND, mounted as close as possible to the AT27C512R-55JC's pins. For systems with multiple EPROMs, a bulk 4.7 µF electrolytic capacitor should also be added near the power entry point to stabilize the rail during collective output switching events.
How is the Product Identification Code accessed on the AT27C512R-55JC?
The AT27C512R-55JC's ID code is read by asserting A9 at 12.0 V ±0.5 V while holding A1–A15 low, then toggling A0: low reads the Manufacturer ID (0x1E), high reads the Device Code (0x0D). This occurs with CE and OE/VPP both low, and requires a high-voltage capable programmer - standard 5 V-only systems cannot access this feature.
AT27C512R-55JC 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:
- 55 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-55JC FAQ
1.How can I place an order for AT27C512R-55JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C512R-55JC 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-55JC reliable?
The price and inventory of AT27C512R-55JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C512R-55JC is usually 5 days.
3.What payment methods are accepted for AT27C512R-55JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C512R-55JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C512R-55JC?
AT27C512R-55JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C512R-55JC 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-55JC?
For technical support, including AT27C512R-55JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C512R-55JC requirements.
6.How does Aetrix verify that AT27C512R-55JC is sourced from the original manufacturer or authorized distributors?
All AT27C512R-55JC 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-55JC meets industry standards.
7.What is the process for return or replacement of AT27C512R-55JC?
All AT27C512R-55JC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C512R-55JC, 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-55JC part is unused and in its original packaging.
Return procedure for AT27C512R-55JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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