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Microchip Technology AT29C512-90JI
- Part No.:
- AT29C512-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29C512-90JI.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,203
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Product details
Overview
AT29C512-90JI from Atmel is a 512 Kbit (64K × 8) in-system programmable Flash memory IC operating at 5 V ±10%, with 90 ns read access time, sector-based reprogramming (512 sectors × 128 bytes), and industrial temperature range (–40°C to +85°C). It serves as nonvolatile program/data storage in embedded controllers, firmware boot loaders, and field-upgradable instrumentation.
For engineers reviewing the AT29C512-90JI datasheet, AT29C512-90JI pinout, AT29C512-90JI application, or AT29C512-90JI equivalent, key selection criteria include sector erase granularity, 5 V-only programming compatibility, DATA polling/Toggle Bit end-of-write detection, CMOS standby current ≤300 µA, and PLCC-32 packaging for through-hole industrial PCBs.
Technical Context
The AT29C512-90JI implements sector-level Flash architecture with internal address/data latches for 128-byte page loads and autonomous erase-then-program sequencing controlled by an on-chip timer. Its dual-line chip enable (CE) and output enable (OE) logic enables bus contention avoidance in shared-memory systems.
Hardware data protection includes VCC sense (<3.8 V inhibits programming), 5 ms power-on delay, and noise filtering (<15 ns pulses rejected); software protection uses a three-byte command sequence (AAh/55h/A0h) to enable/disable write access per sector. Product identification mode returns manufacturer code 1Fh and device code 5Dh via hardware or software entry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 512 Kbit (64K × 8) - supports full firmware images up to 64 KB in size |
| Read Access Time | 90 ns - ensures compatibility with 10 MHz microcontroller buses without wait states |
| Supply Voltage | 5 V ±10% - eliminates need for dedicated programming voltage circuitry |
| Sector Size | 128 bytes × 512 sectors - enables fine-grained firmware updates without full chip erase |
| Endurance | >10,000 write/erase cycles per sector - suitable for field-upgradeable applications with infrequent updates |
| Standby Current | ≤300 µA (industrial temp) - minimizes power in sleep-mode embedded systems |
| Operating Temp | –40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor equipment |
Pinout & Package
AT29C512-90JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), pin-compatible with JEDEC MS-016 AE variant, with gull-wing leads and pin 1 identifier notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus; A7–A15 select sector, A0–A6 select byte within sector |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; supports DATA polling on I/O7 and Toggle Bit on I/O6 |
| CE | Chip Enable | Active-low global enable; must be low for read/write; high forces high-impedance outputs |
| OE | Output Enable | Active-low output gate; used with CE to prevent bus contention during reads |
| WE | Write Enable | Active-low control for byte load and sector programming; timing-critical for 150 µs inter-byte window |
| VCC | Power Supply | +5 V ±10% supply; powers core logic and I/O buffers |
| GND | Ground | Reference return path for all signals and power |
| NC | No Connect | Unbonded pins (positions 6, 9, 10, 23, 24 in PLCC top view) - must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Single 5 V programming | Eliminates high-voltage charge pumps or external VPP generators, simplifying system power design |
| Internal sector latch & timer | Allows CPU to release address/data bus after loading 128 bytes, enabling background operations during 10 ms program cycle |
| DATA polling (I/O7) | Enables real-time status monitoring without dedicated status registers or interrupt lines |
| Toggle Bit (I/O6) | Provides asynchronous write completion detection independent of data content or address |
| Dual data protection | Hardware (VCC sensing, noise filtering) + software (3-byte unlock sequence) prevents accidental writes during power transients or noise events |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing firmware for programmable logic controllers deployed in factory automation cabinets with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding ladder logic interpreter and configuration tables; accessed at power-on reset and during online firmware updates. Use Value: 90 ns read speed ensures deterministic boot timing; industrial temperature rating (–40°C to +85°C) guarantees reliability in unconditioned enclosures; sector erase allows patching of individual function blocks without full reload. |
Use Scenario: Holding certified bootloader code and calibration data in portable diagnostic instruments requiring regulatory-compliant field updates. IC Role / Device Role / Timing Role: Secure firmware repository with software data protection enabled to prevent unauthorized modification of safety-critical startup routines. Use Value: Three-byte software lock sequence enforces update authorization; >10,000 endurance cycles support multi-year recalibration intervals; 300 µA standby current extends battery life in handheld units. |
| Automotive Body Control Module | Telecom Remote Node Configuration |
Use Scenario: Storing lighting control algorithms and seat-position profiles in automotive BCMs exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: Field-upgradable parameter store; accessed via CAN-connected microcontroller during service mode programming. Use Value: PLCC-32 package provides mechanical robustness against vibration; hardware VCC sensing prevents writes during brown-out conditions common in vehicle electrical systems. |
Use Scenario: Retaining configuration bitmaps and protocol stacks for remote DSLAM line cards in telecom central offices. IC Role / Device Role / Timing Role: Persistent settings memory updated via serial management interface; requires sector-level granularity to avoid disrupting active line services during partial reconfiguration. Use Value: 128-byte sector size enables atomic updates of individual port configurations; 5 V-only operation integrates seamlessly with legacy 5 V management ASICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MX29LV512CTTI-90G | 3 V core / 5 V I/O; 90 ns access; 512 Kbit; TSOP-32 package | Lower active current (30 mA vs. 50 mA); no PLCC option; requires level-shifting for pure 5 V systems | Select when migrating to lower-power 3.3 V domains or when surface-mount assembly is preferred |
| AM29LV512-90JC | 5 V only; 90 ns; 512 Kbit; PDIP-32 package; same sector architecture | Commercial temp range (0°C to 70°C); higher standby current (100 µA vs. 300 µA at industrial temp) | Select for cost-sensitive commercial applications where industrial temperature rating is unnecessary |
Compared with MX29LV512CTTI-90G and AM29LV512-90JC, the AT29C512-90JI uniquely combines industrial temperature qualification, PLCC-32 through-hole compatibility, and 5 V-only operation-making it optimal for legacy industrial designs requiring drop-in replacement without board redesign or voltage rail changes.
Availability
AT29C512-90JI is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, automotive body electronics, and telecom infrastructure requiring stable component supply across extended lifecycle commitments.
Supply support for AT29C512-90JI 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 innovator specializing in microcontrollers, Flash memory, and secure authentication solutions for industrial, automotive, and IoT applications.
The AT29C512 product line was designed for in-system programmability in resource-constrained embedded systems requiring reliable, sector-erasable nonvolatile storage without high-voltage programming circuitry.
FAQ
What is the maximum operating frequency supported by the AT29C512-90JI?
The AT29C512-90JI does not operate at a clock frequency; it is an asynchronous parallel Flash memory. Its 90 ns read access time supports microcontrollers or FPGAs running at up to approximately 10 MHz bus speeds without wait states. Write operations are governed by timing parameters like tWC (10 ms sector program time) and tBLC (150 µs byte load window), not a clock signal. The AT29C512-90JI interfaces directly with address/data/control lines without internal clocking.
Does the AT29C512-90JI support full-chip erase?
Yes, the AT29C512-90JI supports optional full-chip erase via a 6-byte software command sequence (AAh/55h/80h/AAh/55h/10h), documented in Atmel's Software Chip Erase application note. This mode erases all 512 sectors simultaneously, unlike standard sector erase which targets one 128-byte block. Full-chip erase is useful during initial programming or complete firmware replacement but takes significantly longer than sector erase.
How is software data protection enabled and disabled on the AT29C512-90JI?
Software data protection on the AT29C512-90JI is enabled by writing AAh to address 5555h, 55h to 2AAAh, then A0h to 5555h. It is disabled by writing AAh→5555h, 55h→2AAAh, 80h→5555h, AAh→5555h, 55h→2AAAh, and 20h→5555h. Once enabled, all subsequent programming requires repeating the three-byte enable sequence before each sector load. Power cycles do not clear the protection state.
What package type is used for the AT29C512-90JI, and is it RoHS compliant?
The AT29C512-90JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package, identified by ordering code suffix "J". Per Atmel documentation (Rev. 0456F), this variant is leaded and not RoHS-compliant; RoHS-compliant alternatives (e.g., AT29C512-90TQI in TSOP) require package redesign. The PLCC-32 offers mechanical robustness for industrial vibration environments but requires through-hole assembly.
Can the AT29C512-90JI be programmed in-circuit using standard microcontroller GPIOs?
Yes, the AT29C512-90JI is explicitly designed for in-system programming using standard 5 V-tolerant GPIOs. Its 5 V-only interface, DATA polling (I/O7), and Toggle Bit (I/O6) allow microcontrollers to monitor write completion without dedicated status lines. Byte load timing (tWP ≥90 ns, tBLC ≤150 µs) is achievable with most 8-bit and 16-bit MCUs using bit-banged or parallel port interfaces, provided OE is held high during programming sequences.
AT29C512-90JI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT29C512-90JI FAQ
1.How can I place an order for AT29C512-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C512-90JI 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 AT29C512-90JI reliable?
The price and inventory of AT29C512-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C512-90JI is usually 5 days.
3.What payment methods are accepted for AT29C512-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C512-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C512-90JI?
AT29C512-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C512-90JI 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 AT29C512-90JI?
For technical support, including AT29C512-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C512-90JI requirements.
6.How does Aetrix verify that AT29C512-90JI is sourced from the original manufacturer or authorized distributors?
All AT29C512-90JI 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 AT29C512-90JI meets industry standards.
7.What is the process for return or replacement of AT29C512-90JI?
All AT29C512-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT29C512-90JI, 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 AT29C512-90JI part is unused and in its original packaging.
Return procedure for AT29C512-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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