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Microchip Technology AT29C512-90JU-T
- Part No.:
- AT29C512-90JU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29C512-90JU-T.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,370
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Product details
Overview
AT29C512-90JU-T from Atmel is a 512 Kbit (64K × 8) parallel-interface Flash memory IC designed for in-system reprogrammability in embedded controllers and firmware storage applications. It operates on a single 5V ±10% supply, delivers 90 ns read access time, supports sector-based programming of 128-byte blocks, and features hardware and software data protection. Its PLCC-32 package enables socketed replacement in industrial control and legacy system upgrades.
For engineers reviewing the AT29C512-90JU-T datasheet, AT29C512-90JU-T pinout, AT29C512-90JU-T application, or AT29C512-90JU-T equivalent, key selection criteria include 90 ns read timing, 5V-only programming compatibility, sector erase granularity, DATA polling/Toggle Bit program status detection, and PLCC-32 mechanical fit in space-constrained industrial PCBs.
Technical Context
The AT29C512-90JU-T implements a sector-based Flash architecture with 512 independent 128-byte sectors, each erasable and programmable in a single internal cycle. Programming requires no external high-voltage supply-only standard 5V logic levels-and uses internal latches to hold sector data during autonomous erase-and-program execution.
It supports dual program status verification methods: DATA polling on I/O7 (complement-to-data during programming, true data upon completion) and Toggle Bit monitoring on I/O6 (toggling until operation ends). Hardware protection includes VCC sense (<3.8V inhibit), 5 ms power-on delay, and noise filtering on WE/CE inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 512 Kbit (64K × 8), enabling full firmware image storage for 8-bit microcontrollers |
| Read Access Time | 90 ns max - meets timing requirements for 11 MHz bus interfaces without wait states |
| Programming Cycle Time | 10 ms per sector - deterministic duration for host firmware to schedule background updates |
| Supply Voltage | 5V ±10% - compatible with legacy 5V logic rails and eliminates need for auxiliary voltage regulators |
| Standby Current | 300 µA CMOS - enables low-power retention in battery-backed systems |
| Endurance | >10,000 write/erase cycles per sector - supports field firmware updates over multi-year product life |
| Operating Temperature | –40°C to +85°C - qualified for industrial ambient environments without derating |
Pinout & Package
AT29C512-90JU-T is housed in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package with JEDEC MS-016, Variation AE compliance. Dimensions: 12.57 mm × 15.11 mm × 3.56 mm (max height), lead pitch 1.27 mm, coplanarity ≤0.102 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus supporting full 64K-word addressing; 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 indication |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high forces outputs to high-impedance state |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during reads |
| WE | Write Enable | Active-low write strobe; initiates byte load and sector programming when CE low and OE high |
| VCC | Power Supply | +5V ±10% main supply; powers core logic and I/O buffers |
| GND | Ground | Reference return path for all signals and power |
| NC | No Connect | Pins 14, 15, 30, 31 are unconnected; must remain floating or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Reprogramming | Eliminates need for +12V programming supplies, simplifying power design and enabling in-circuit updates |
| Hardware Data Protection | VCC sense, 5 ms power-on delay, and 15 ns noise filtering prevent spurious writes during brown-out or EMI events |
| Software Data Protection | Three-byte unlock sequence (AAh/55h/A0h) required before programming - prevents accidental firmware corruption |
| DATA Polling & Toggle Bit | Dual asynchronous status reporting allows host CPU to poll I/O7 or I/O6 without fixed timing delays or interrupts |
| Green Packaging | Pb/Halide-free PLCC construction complies with RoHS Directive 2011/65/EU without performance trade-offs |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot Memory |
|---|---|
Use Scenario: Storing ladder logic and configuration data in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding firmware executed directly by the PLC's 8-bit microcontroller at power-up. Use Value: 90 ns read speed ensures deterministic boot timing; >10,000 endurance supports field firmware patches; hardware write protection prevents corruption during line transients. |
Use Scenario: Replacing obsolete EPROMs in medical diagnostic instruments where board redesign is prohibited and socket compatibility is mandatory. IC Role / Device Role / Timing Role: Pin-compatible Flash replacement for 27C512 EPROMs, retaining same PLCC-32 footprint and 5V interface. Use Value: 5V-only programming eliminates UV eraser dependency and high-voltage programming fixtures; sector erase enables partial firmware updates without full chip erase. |
| Automotive Body Control Module | Point-of-Sale Terminal Configuration Memory |
Use Scenario: Holding calibration tables and feature-enable bits in automotive body control units exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: Parameter storage device accessed via microcontroller's parallel memory bus during initialization and runtime. Use Value: –40°C to +85°C industrial rating ensures reliability across vehicle lifetime; 300 µA standby current minimizes battery drain during ignition-off periods. |
Use Scenario: Storing localized language packs, tax rate tables, and peripheral driver configurations in retail terminals deployed globally. IC Role / Device Role / Timing Role: Field-upgradable configuration memory accessed only during terminal boot or maintenance mode. Use Value: Software data protection prevents unauthorized parameter changes; sector-based programming allows selective update of regional settings without affecting core firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF512 | 512 Kbit, 70 ns read, 3.3V supply only; lacks hardware VCC-sense protection | Requires 3.3V rail and level-shifting for 5V systems; not drop-in for AT29C512-90JU-T sockets | Select only if migrating to 3.3V architecture and redesigning power delivery |
| MX29LV512 | 512 Kbit, 90 ns read, 3.0–3.6V supply; supports CFI command set but no software data protection algorithm | Needs different initialization sequence; no built-in 3-byte unlock, increasing firmware vulnerability risk | Choose for CFI-compliant toolchains but implement external write-protection logic |
Compared with SST39VF512 and MX29LV512, the AT29C512-90JU-T uniquely combines 5V-only operation, hardware VCC-sense, and Atmel's proprietary software data protection-making it the only option for direct socket replacement in legacy 5V industrial systems requiring robust field-programmability.
Availability
AT29C512-90JU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot memory, and automotive body control module applications requiring stable component supply and long-term obsolescence management.
Supply support for AT29C512-90JU-T 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, Flash memory, and secure authentication devices for industrial and automotive markets.
The AT29C512-90JU-T belongs to Atmel's legacy parallel Flash memory product line, engineered specifically for 5V in-system reprogrammability in cost-sensitive, space-constrained embedded systems with strict legacy compatibility requirements.
FAQ
What is the maximum operating temperature range for the AT29C512-90JU-T?
The AT29C512-90JU-T is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all DC and AC parameters including 90 ns read access time, 10 ms sector programming, and 300 µA standby current. Operation outside this range may result in timing violations or reduced endurance.
Does the AT29C512-90JU-T require high-voltage programming signals?
No, the AT29C512-90JU-T uses 5-volt-only programming-no external 12V or higher voltages are needed. All commands (sector program, chip erase, software protection enable/disable) are issued using standard 5V logic levels on CE, WE, OE, and address/data pins. This eliminates high-voltage generator circuitry in the host system.
How does software data protection work on the AT29C512-90JU-T?
Software data protection on the AT29C512-90JU-T is enabled via a three-byte unlock sequence (AAh to 5555h, 55h to 2AAAh, A0h to 5555h). Once enabled, every subsequent program cycle must begin with this exact sequence. The AT29C512-90JU-T retains protection state across power cycles unless explicitly disabled using the 80h/20h exit sequence.
Can the AT29C512-90JU-T be used as a direct replacement for the AT29C512-70JU-T?
Yes, the AT29C512-90JU-T is functionally identical to the AT29C512-70JU-T except for read timing: 90 ns vs. 70 ns access. Both share the same pinout, programming algorithms, voltage specs, and package. Systems designed for the -70 version will operate reliably with the -90 variant, though maximum bus clock speed may decrease slightly.
What package type does the AT29C512-90JU-T use, and is it RoHS compliant?
The AT29C512-90JU-T uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package designated "32J" per Atmel's ordering guide. It is RoHS-compliant with Pb/Halide-free construction, meeting EU Directive 2011/65/EU. The package conforms to JEDEC MS-016, Variation AE, and has verified coplanarity ≤0.102 mm.
AT29C512-90JU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT29C512-90JU-T FAQ
1.How can I place an order for AT29C512-90JU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C512-90JU-T 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 AT29C512-90JU-T reliable?
The price and inventory of AT29C512-90JU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C512-90JU-T is usually 5 days.
3.What payment methods are accepted for AT29C512-90JU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C512-90JU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C512-90JU-T?
AT29C512-90JU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C512-90JU-T 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 AT29C512-90JU-T?
For technical support, including AT29C512-90JU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C512-90JU-T requirements.
6.How does Aetrix verify that AT29C512-90JU-T is sourced from the original manufacturer or authorized distributors?
All AT29C512-90JU-T 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 AT29C512-90JU-T meets industry standards.
7.What is the process for return or replacement of AT29C512-90JU-T?
All AT29C512-90JU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT29C512-90JU-T, 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 AT29C512-90JU-T part is unused and in its original packaging.
Return procedure for AT29C512-90JU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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