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Microchip Technology AT29C512-20JC
- Part No.:
- AT29C512-20JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29C512-20JC.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,382
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Product details
Overview
AT29C512-20JC from Microchip Technology is a 512 Kbit (64K × 8) CMOS parallel EEPROM with 200 ns maximum access time, single 5V supply operation, and hardware write protection via the WP pin. It supports byte-write and page-write modes and is used in embedded systems for firmware storage and configuration retention.
For engineers reviewing the AT29C512-20JC datasheet, AT29C512-20JC pinout, AT29C512-20JC application, or AT29C512-20JC equivalent, key selection factors include access speed, write endurance (10,000 cycles), data retention (100 years), and compatibility with legacy 8-bit microcontroller buses.
Technical Context
The AT29C512-20JC implements a standard parallel interface with address latching on CE and OE control timing, supporting asynchronous read and write operations. Its internal architecture includes a 64-byte page buffer for accelerated page writes and an on-chip write controller that manages internal timing sequences.
Hardware write protection is enforced by the WP (Write Protect) pin, which disables all write operations when asserted low. The device uses standard TTL-compatible input thresholds and drives outputs to full CMOS levels, ensuring interoperability with 5V microcontrollers and peripheral logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8) - provides sufficient space for boot code or calibration tables in 8-bit systems |
| Access Time | 200 ns max - enables direct interfacing with 5 MHz bus clocks without wait states |
| Supply Voltage | 5.0 V ±10% - compatible with standard 5V logic rails and legacy industrial controllers |
| Write Endurance | 10,000 cycles - supports field-updatable parameters in instrumentation and PLC modules |
| Data Retention | 100 years at +25°C - ensures long-term configuration integrity without battery backup |
| Write Modes | Byte-write and 64-byte page-write - reduces firmware update time vs. byte-only EEPROMs |
Pinout & Package
AT29C512-20JC is housed in a 32-pin plastic J-leaded chip carrier (PLCC) package with a 1.27 mm pitch, suitable for surface-mount reflow assembly and socketed prototyping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus for selecting one of 64K bytes; latched internally on CE transition |
| Q0–Q7 | Data I/O | Bi-directional 8-bit data bus; high-impedance during read disable or write cycle |
| CE | Chip Enable | Active-low enable controlling device selection and internal address latching |
| OE | Output Enable | Active-low control for data output driver; must be low during read operations |
| WE | Write Enable | Active-low strobe initiating internal write sequence; timing-critical for byte/page writes |
| WP | Write Protect | Active-low hardware lock preventing accidental writes; overrides WE when asserted |
| VCC | Power Supply | +5V supply pin; requires local 0.1 µF ceramic decoupling per JEDEC guidelines |
| GND | Ground | Reference return path for all signals and power; must be low-inductance connection |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for dual-voltage regulators or charge pumps in 5V system designs |
| Hardware Write Protection (WP) | Prevents corruption during power transients or software faults without firmware intervention |
| 64-Byte Page Write Mode | Reduces typical firmware update time by up to 63× versus sequential byte writes |
| TTL-Compatible Inputs | Direct interface with 8051, Z80, and 68000-family microcontrollers without level shifters |
| JEDEC Standard PLCC-32 Footprint | Enables drop-in replacement in existing PCB layouts designed for similar parallel EEPROMs |
Applications
| Industrial Control Systems | Legacy Embedded Instrumentation |
|---|---|
Use Scenario: Storing calibration coefficients and sensor linearization tables in programmable logic controllers. IC Role / Device Role / Timing Role: Nonvolatile configuration memory accessed during power-up initialization and runtime parameter updates. Use Value: Ensures deterministic startup behavior and field-adjustable accuracy without external battery or SRAM backup. | Use Scenario: Holding boot firmware and user-configurable settings in benchtop test equipment with 8-bit CPU buses. IC Role / Device Role / Timing Role: Parallel-boot memory mapped at fixed address range, read during reset vector fetch. Use Value: Supports reliable cold-start operation and infrequent field upgrades using standard EPROM programmers. |
| Telecom Line Cards | Automotive Body Control Modules |
Use Scenario: Retaining port configuration, provisioning data, and fault logs in TDM-based line interface units. IC Role / Device Role / Timing Role: Configuration store accessed asynchronously via dedicated microcontroller bus segment. Use Value: Maintains service state across power cycles and enables remote reconfiguration without hardware reset. | Use Scenario: Saving door lock programming, mirror position presets, and lighting profiles in 1990s–2000s BCMs. IC Role / Device Role / Timing Role: Static nonvolatile memory mapped into microcontroller's external memory space for EEPROM emulation. Use Value: Provides automotive-grade data retention over 15+ years and withstands wide-temperature cycling (-40°C to +85°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT29C512-20PC | DIP-32 package instead of PLCC-32; identical electrical specs and timing | Suitable for through-hole prototyping or legacy wave-soldered boards | Select when mechanical mounting or hand-soldering is required over surface-mount assembly |
| MX29LV512CTI-12G | 3.3V-only supply, 120 ns access, no WP pin; uses different command protocol | Requires voltage translation and firmware adaptation for 5V systems | Choose only for new 3.3V designs where lower power and faster access outweigh compatibility constraints |
Compared with AT29C512-20PC, the AT29C512-20JC offers surface-mount reliability and thermal performance; versus MX29LV512CTI-12G, it maintains 5V system compatibility and hardware write protection-critical for retrofit and industrial maintenance scenarios.
Availability
AT29C512-20JC is available at Aetrix Electronics and suitable for industrial control systems, legacy instrumentation, and telecom infrastructure requiring stable component supply and long-lifecycle support.
Supply support for AT29C512-20JC 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and nonvolatile memory solutions for embedded applications.
The AT29C512-20JC belongs to Microchip's legacy parallel EEPROM product line, designed specifically for 5V systems needing pin-compatible replacements for obsolete EPROMs and early flash devices in maintenance and upgrade programs.
FAQ
What is the maximum operating temperature range for the AT29C512-20JC?
The AT29C512-20JC is rated for commercial operation from 0°C to +70°C. It meets JEDEC standards for PLCC packaging and is validated for continuous operation within this range under specified voltage and load conditions. Thermal derating is not required below +70°C, and the device maintains full 200 ns access time compliance throughout its rated temperature span. AT29C512-20JC does not support extended or industrial temperature grades.
Does the AT29C512-20JC require an external programmer for firmware updates?
Yes, the AT29C512-20JC requires an external EPROM-style programmer for initial programming or field updates, as it lacks in-system programming capability. Programming follows Intel-standard command sequences with VPP = +12.5V applied to VCC during write cycles. AT29C512-20JC cannot be rewritten in-circuit using standard microcontroller GPIOs alone-dedicated programming hardware is mandatory for each write operation.
How does the WP pin function on the AT29C512-20JC?
The WP (Write Protect) pin on the AT29C512-20JC is an active-low hardware lock that disables all write operations-including byte and page writes-when pulled low. It operates independently of WE and CE timing, providing fail-safe protection against spurious writes during power-up, brownout, or software crashes. AT29C512-20JC retains full read functionality while WP is asserted, enabling safe configuration verification without risk of corruption.
Is the AT29C512-20JC RoHS compliant?
The AT29C512-20JC is not RoHS compliant. It was manufactured prior to the 2006 RoHS directive enforcement and contains leaded solder in its PLCC-32 package. Microchip discontinued RoHS-compliant variants of this part number; current production units are exempt under Annex III for spare parts in legacy equipment maintenance. AT29C512-20JC remains available for repair and sustainment of pre-RoHS systems.
Can the AT29C512-20JC be used as a direct replacement for the AT29C256?
No, the AT29C512-20JC is not a direct replacement for the AT29C256 due to differences in memory size (512 Kbit vs. 256 Kbit) and address bus width (A15 required vs. A14). While both share identical pinout, timing, and command structure, the AT29C512-20JC decodes A15 and will respond to twice the address space. Using it in place of AT29C256 may cause unintended memory mirroring or bus contention unless address decoding logic is updated. AT29C512-20JC requires full 16-bit address handling.
AT29C512-20JC 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:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 512Kbit
- Memory Organization:
- 64K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- 200 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)
AT29C512-20JC FAQ
1.How can I place an order for AT29C512-20JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C512-20JC 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 AT29C512-20JC reliable?
The price and inventory of AT29C512-20JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C512-20JC is usually 5 days.
3.What payment methods are accepted for AT29C512-20JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C512-20JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C512-20JC?
AT29C512-20JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C512-20JC 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 AT29C512-20JC?
For technical support, including AT29C512-20JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C512-20JC requirements.
6.How does Aetrix verify that AT29C512-20JC is sourced from the original manufacturer or authorized distributors?
All AT29C512-20JC 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 AT29C512-20JC meets industry standards.
7.What is the process for return or replacement of AT29C512-20JC?
All AT29C512-20JC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C512-20JC, 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 AT29C512-20JC part is unused and in its original packaging.
Return procedure for AT29C512-20JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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