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Microchip Technology AT29C512-20PC
- Part No.:
- AT29C512-20PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT29C512-20PC.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,684
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Product details
Overview
AT29C512-20PC from Microchip Technology is a 512 Kbit (64K × 8) CMOS parallel EEPROM with 200 ns maximum access time, single 5V supply operation, and hardware-controlled write protection via WP pin. It supports byte-write and page-write (up to 64 bytes) modes and is used in embedded systems for firmware storage and configuration retention.
For engineers reviewing the AT29C512-20PC datasheet, AT29C512-20PC pinout, AT29C512-20PC application, or AT29C512-20PC equivalent, key selection criteria include 5V-only operation, 200 ns access timing, hardware write protect, page-write capability, and PDIP-28 package compatibility with legacy 8-bit microcontroller buses.
Technical Context
The AT29C512-20PC implements a standard parallel memory interface with address latching via CE and OE control, supporting asynchronous read and write cycles. Its internal write controller manages erase-before-write sequencing and built-in write cycle termination at completion.
It features a dedicated Write Protect (WP) pin that disables all write operations when asserted, and includes an internal VPP charge pump for programming-eliminating need for external high-voltage supply. Data retention exceeds 10 years after 10,000 write/erase cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8), directly maps to 64KB address space for 8-bit microcontrollers |
| Access Time | 200 ns max - ensures compatibility with 5 MHz bus timing without wait states |
| Supply Voltage | 5.0 V ±10% - operates from standard logic rail, no auxiliary voltage required |
| Write Cycle Time | 10 ms max per byte or page - enables deterministic firmware update latency |
| Data Retention | 10 years minimum - validated under JEDEC JESD22-A117 conditions |
| Endurance | 10,000 write/erase cycles - sufficient for infrequent configuration updates |
| Write Protection | Hardware-enabled via WP pin - prevents accidental overwrites during power transitions |
Pinout & Package
AT29C512-20PC is housed in a 28-pin plastic dual in-line package (PDIP-28) with 0.600-inch width, compatible with industry-standard socket footprints and wave-solder reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus for full 64K decoding; A15 selects upper/lower half of memory map |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path for read/write; high-impedance during chip disable |
| CE̅ | Chip Enable | Active-low enable controlling device selection; must be low for valid read/write cycles |
| OE̅ | Output Enable | Active-low control for data bus output driver; separates read timing from address setup |
| WE̅ | Write Enable | Active-low signal initiating internal write sequence; sampled on rising edge of WE̅ |
| WP̅ | Write Protect | Active-low hardware lock; disables all write operations regardless of CE̅/WE̅ state |
| VCC | Power Supply | +5V supply input; decoupling capacitor required within 1 cm of pin |
| VSS | Ground | Reference return path for all I/O and core logic; separate ground plane recommended |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for +12V or +21V programming voltage; simplifies power design and reduces BOM count |
| Page-Write Mode (64 bytes) | Reduces firmware update time by up to 64× versus byte-write; improves system-level programming efficiency |
| Hardware Write Protection | Prevents corruption during brown-out, reset, or software fault - no firmware dependency required |
| JEDEC Standard Pinout | Direct drop-in replacement for industry-standard 27C512 and 27C256 EPROMs in existing PCB layouts |
| Automatic Write Cycle Termination | Internal timer ends write after completion; removes need for external polling or timeout logic |
Applications
| Industrial PLC Configuration Storage | Legacy Embedded System Firmware Backup |
|---|---|
Use Scenario: Storing ladder logic parameters and I/O mapping tables in programmable logic controllers subject to frequent power cycling. IC Role / Device Role / Timing Role: Nonvolatile configuration register bank with guaranteed write integrity during unexpected shutdown. Use Value: WP̅ pin prevents parameter corruption during brown-out events; 10,000-cycle endurance supports decades of field updates. | Use Scenario: Retaining boot code and calibration constants in 8-bit microcontroller-based medical devices with long product lifecycles. IC Role / Device Role / Timing Role: Parallel-programmable firmware storage mapped into CPU address space at reset vector. Use Value: 200 ns access time meets timing budget of 5 MHz Z80/8051 derivatives; PDIP-28 fits legacy board sockets. |
| Point-of-Sale Terminal Settings | Automotive Body Control Module EEPROM |
Use Scenario: Saving tax rates, receipt formats, and user preferences in retail terminals operating 24/7 with infrequent reconfiguration. IC Role / Device Role / Timing Role: Byte-addressable nonvolatile memory accessed via discrete address/data bus with CE̅/OE̅/WE̅ handshaking. Use Value: Page-write mode enables fast batch updates during firmware upgrades; 10-year data retention ensures settings survive device replacement. | Use Scenario: Storing seat position presets, mirror angles, and lighting profiles in automotive BCMs requiring AEC-Q100 compliance support. IC Role / Device Role / Timing Role: Configuration memory interfaced to 8-bit MCU via parallel bus; WP̅ tied to ignition sense for runtime lockout. Use Value: Hardware write protect prevents inadvertent overwrite during vehicle jump-start or battery disconnect events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar parallel EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT29C512-20JC | Same electrical specs; packaged in 28-pin PLCC instead of PDIP-28 | Requires surface-mount layout; not socket-compatible with through-hole designs | Select when board space is constrained and reflow assembly is used |
| AT29LV512-20PU | 3.3V/5V tolerant; 200 ns access but lower 2.7–5.5V supply range | Enables mixed-voltage systems; not suitable for 5V-only legacy buses without level translation | Select when migrating toward lower-power operation or dual-supply architectures |
Compared with AT29C512-20JC and AT29LV512-20PU, the AT29C512-20PC offers guaranteed 5V-only compatibility and through-hole PDIP-28 fit for legacy repair and prototyping, while the alternatives trade package form factor or voltage flexibility for different integration constraints.
Availability
AT29C512-20PC is available at Aetrix Electronics and suitable for industrial PLCs, legacy medical devices, point-of-sale terminals, and automotive body control modules requiring stable component supply across extended production lifecycles.
Supply support for AT29C512-20PC 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 components, and nonvolatile memory solutions for embedded control applications.
The AT29C512-20PC belongs to Microchip's legacy parallel EEPROM product line, designed specifically for pin-compatible replacement of UV-erasable EPROMs in 8-bit microprocessor systems requiring field-upgradable firmware storage.
FAQ
What is the maximum access time specification for the AT29C512-20PC?
The AT29C512-20PC has a maximum access time of 200 ns under standard operating conditions (VCC = 5.0 V, TA = 25°C). This timing allows direct interface with 5 MHz microcontrollers without wait-state insertion and is fully characterized across commercial temperature range (0°C to +70°C).
Does the AT29C512-20PC require a high-voltage programming supply?
No, the AT29C512-20PC does not require an external high-voltage programming supply. It uses an internal charge pump to generate the necessary programming voltage from the standard 5V VCC rail, enabling single-supply operation and simplifying system power architecture.
How does hardware write protection work on the AT29C512-20PC?
The AT29C512-20PC includes a dedicated WP̅ (Write Protect) pin. When WP̅ is driven low, all write operations-including byte-write and page-write-are disabled regardless of CE̅, OE̅, or WE̅ states. This provides robust, firmware-independent protection against unintended writes during power-up/down or system faults.
Can the AT29C512-20PC be used as a direct replacement for 27C512 EPROMs?
Yes, the AT29C512-20PC uses JEDEC-standard pinout and timing, making it a functional and pin-compatible replacement for 27C512 EPROMs in existing designs. Unlike EPROMs, it requires no UV erasure and supports in-system reprogramming via standard 5V signals.
What is the data retention period and endurance rating for the AT29C512-20PC?
The AT29C512-20PC guarantees a minimum data retention period of 10 years and an endurance rating of 10,000 write/erase cycles per memory location, as validated per JEDEC JESD22-A117 and JESD22-A116 standards under specified operating conditions.
AT29C512-20PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-DIP (0.600", 15.24mm)
- 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:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT29C512-20PC FAQ
1.How can I place an order for AT29C512-20PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C512-20PC 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 AT29C512-20PC reliable?
The price and inventory of AT29C512-20PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C512-20PC is usually 5 days.
3.What payment methods are accepted for AT29C512-20PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C512-20PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C512-20PC?
AT29C512-20PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C512-20PC 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 AT29C512-20PC?
For technical support, including AT29C512-20PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C512-20PC requirements.
6.How does Aetrix verify that AT29C512-20PC is sourced from the original manufacturer or authorized distributors?
All AT29C512-20PC 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 AT29C512-20PC meets industry standards.
7.What is the process for return or replacement of AT29C512-20PC?
All AT29C512-20PC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C512-20PC, 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 AT29C512-20PC part is unused and in its original packaging.
Return procedure for AT29C512-20PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29C512-20PC Tags
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