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Microchip Technology AT29C512-90JC
- Part No.:
- AT29C512-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29C512-90JC.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,049
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Product details
Overview
AT29C512-90JC from Atmel is a 512 Kbit (64K × 8) CMOS Flash memory IC designed for in-system reprogrammability with 5 V only operation, 90 ns read access time, sector-based programming (512 sectors × 128 bytes), and hardware/software data protection - used in embedded firmware storage, industrial controller boot memory, and field-upgradable instrumentation.
For engineers reviewing the AT29C512-90JC datasheet, AT29C512-90JC pinout, AT29C512-90JC application, or AT29C512-90JC equivalent, key selection criteria include its 90 ns read timing, 10 ms sector program cycle, 5 V ±10% supply tolerance, 100 µA CMOS standby current, and PLCC-32 packaging for legacy board compatibility.
Technical Context
The AT29C512-90JC implements a sector-erase architecture where each of 512 sectors (128 bytes) is independently programmable via single-cycle erase-and-program; internal address/data latches hold full sector data during load, freeing the bus for concurrent operations. Its control logic responds to standard CE/OE/WE signals with TTL/CMOS-compatible thresholds and supports both hardware and software product identification (Manufacturer Code 1F, Device Code 5D).
Programming uses a command sequence (e.g., AAh/55h/A0h) to enable writes, with DATA polling on I/O7 or toggle-bit detection on I/O6 confirming completion; hardware protection includes VCC sense (<3.8 V inhibits programming), 5 ms power-on delay, and noise filtering (<15 ns pulses ignored).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8), sufficient for boot code or configuration data in microcontroller systems |
| Read Access Time | 90 ns max - determines minimum CPU wait states for direct memory-mapped access |
| Sector Architecture | 512 sectors × 128 bytes - enables granular firmware updates without full chip erase |
| Program Cycle Time | 10 ms per sector - defines worst-case latency for field firmware patching |
| Supply Voltage | 5 V ±10% - compatible with legacy 5 V logic rails without regulation overhead |
| Standby Current | 100 µA (CMOS, commercial temp) - enables low-power retention in battery-backed systems |
| Endurance | >10,000 write/erase cycles per sector - supports long-term field upgradeability |
| Operating Temp | 0°C to +70°C - validated for commercial-grade industrial control panels and test equipment |
Pinout & Package
AT29C512-90JC is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), pin-compatible with industry-standard JEDEC MS-016 variation AE, suitable for socketed or surface-mount legacy designs requiring mechanical robustness and thermal cycling resilience.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus for accessing all 64K words; A7–A15 select sector, A0–A6 select byte within sector |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; I/O7 used for DATA polling, I/O6 for toggle-bit status monitoring |
| CE | Chip Enable | Active-low global select; must be low for read/write; high forces high-impedance outputs and inhibits programming |
| OE | Output Enable | Active-low output control; low enables data output during read; high disables outputs to prevent bus contention |
| WE | Write Enable | Active-low programming control; falling edge latches address/data during byte load; must be high during read |
| VCC | Power Supply | +5 V ±10% main supply; powers core logic and I/O buffers; VCC sense circuitry prevents programming below 3.8 V |
| GND | Ground Reference | Signal and power return path; decoupling required near VCC pin to suppress switching noise |
| NC | No Connect | Unbonded pins (positions 6, 9, 10, 21 in PLCC top view); must remain unconnected per design |
Key Features
| Feature | Design Value |
|---|---|
| 5 V-only reprogramming | Eliminates need for 12 V programming supplies, simplifying power architecture in embedded systems |
| Internal sector latches | 128-byte data/address latch frees external bus during 10 ms internal program cycle |
| Hardware data protection | VCC sense, 5 ms power-on delay, and noise filtering prevent accidental writes during power transitions |
| Software data protection | Three-command sequence (AAh/55h/A0h) enables/disables write access, supporting secure firmware update workflows |
| DATA polling & toggle bit | Dual asynchronous status methods (I/O7 complement, I/O6 toggling) allow flexible polling without timer dependencies |
| CMOS/TTL I/O compatibility | Supports direct interfacing with both legacy TTL and modern CMOS microcontrollers without level shifters |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
|
Use Scenario: Storing firmware images and calibration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to microcontroller address space; 90 ns access ensures deterministic startup timing. Use Value: Sector erase allows field updates of individual function modules without disrupting operational firmware, reducing downtime. |
Use Scenario: Holding device-specific calibration coefficients and safety-critical configuration parameters in diagnostic imaging equipment. IC Role / Device Role / Timing Role: Secure configuration store with hardware/software write protection preventing unauthorized parameter changes. Use Value: >10,000 endurance cycles support lifetime recalibration events; 100 µA standby current extends battery backup duration. |
| Test Equipment Boot Loader | Legacy Industrial HMI Storage |
|
Use Scenario: Hosting boot loader and self-test routines in automated test systems requiring reliable cold-start execution. IC Role / Device Role / Timing Role: Primary ROM replacement with direct bus interface; CE/OE dual-control prevents bus contention during multi-peripheral operation. Use Value: 5 V-only operation matches legacy 5 V test system power rails; PLCC-32 package enables socket-based field replacement. |
Use Scenario: Retaining user interface graphics, language packs, and menu logic in human-machine interface panels installed in manufacturing cells. IC Role / Device Role / Timing Role: Field-upgradable firmware store supporting regionalization and feature activation via sector programming. Use Value: Software protection sequence prevents inadvertent overwrites during panel servicing; 0°C to +70°C rating matches enclosure thermal profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV512-90JC | 3 V core with 5 V I/O tolerant; 90 ns read; requires VPP = 12 V for programming | Designed for mixed-voltage systems; not 5 V-only - needs additional voltage translation or regulation | Select if migrating to lower power; verify VPP generation capability and I/O voltage compatibility |
| MX29LV512CTI-90G | 3 V supply only; 90 ns read; no 5 V tolerance; different command set and sector map (64 sectors × 8 KB) | Requires full 3 V system redesign; incompatible sector size prevents drop-in replacement | Choose only for new 3 V designs; not suitable for AT29C512-90JC retrofit due to voltage and architecture mismatch |
Compared with AM29LV512-90JC and MX29LV512CTI-90G, the AT29C512-90JC uniquely supports true 5 V-only operation without auxiliary voltages, maintains identical PLCC-32 pinout and sector granularity, and delivers proven reliability in commercial-temperature industrial deployments where legacy voltage compliance is mandatory.
Availability
AT29C512-90JC is available at Aetrix Electronics and suitable for industrial controller firmware storage, medical device calibration memory, and test equipment boot loader applications requiring stable component supply across extended production lifecycles.
Supply support for AT29C512-90JC 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
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and security ICs, with a legacy of high-reliability Flash products for industrial and automotive markets.
The AT29C512-90JC belongs to Atmel's legacy parallel-interface Flash memory family, engineered for in-system reprogrammability in 5 V embedded systems where pin compatibility, sector-level granularity, and robust data retention are critical.
FAQ
What is the maximum read access time specified for the AT29C512-90JC?
The AT29C512-90JC has a maximum read access time of 90 ns, measured from address valid to valid data on I/O0–I/O7 when CE and OE are low and WE is high. This timing applies across the commercial temperature range (0°C to +70°C) and with VCC = 5 V ±10%, enabling direct interfacing with microcontrollers requiring minimal wait-state insertion.
How does sector programming work in the AT29C512-90JC?
Sector programming in the AT29C512-90JC loads 128 bytes into internal latches using byte-load cycles (WE or CE pulse), then executes automatic erase-and-program of the entire sector in 10 ms. A7–A15 define the sector address; A0–A6 define the byte offset. Unloaded bytes in the sector become indeterminate, so full 128-byte reload is mandatory before each program cycle.
Does the AT29C512-90JC support both hardware and software data protection?
Yes, the AT29C512-90JC implements dual-layer protection: hardware protection includes VCC sensing (<3.8 V inhibits programming), 5 ms power-on delay, and noise filtering on WE/CE inputs; software protection requires a three-command sequence (AAh/55h/A0h) to enable writes, and remains active until explicitly disabled with a separate unlock sequence.
What package type is used for the AT29C512-90JC?
The AT29C512-90JC uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package, compliant with JEDEC MS-016 variation AE. It features a square body with J-shaped leads, pin 1 identifier notch, and dimensions of 12.5 mm × 12.5 mm × 3.5 mm (max height), optimized for socketed legacy designs and thermal cycling resilience.
Can the AT29C512-90JC be used in industrial temperature applications?
No - the AT29C512-90JC is rated for commercial temperature range only (0°C to +70°C). For industrial applications (-40°C to +85°C), the correct variant is AT29C512-90JI (same PLCC-32 package, but qualified to industrial specs and with higher 300 µA standby current).
AT29C512-90JC 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:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 512Kbit
- Memory Organization:
- 64K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 10ms
- 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)
AT29C512-90JC FAQ
1.How can I place an order for AT29C512-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C512-90JC 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 AT29C512-90JC reliable?
The price and inventory of AT29C512-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C512-90JC is usually 5 days.
3.What payment methods are accepted for AT29C512-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C512-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C512-90JC?
AT29C512-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C512-90JC 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 AT29C512-90JC?
For technical support, including AT29C512-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C512-90JC requirements.
6.How does Aetrix verify that AT29C512-90JC is sourced from the original manufacturer or authorized distributors?
All AT29C512-90JC 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 AT29C512-90JC meets industry standards.
7.What is the process for return or replacement of AT29C512-90JC?
All AT29C512-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C512-90JC, 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 AT29C512-90JC part is unused and in its original packaging.
Return procedure for AT29C512-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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