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Microchip Technology AT49F512-90JC
- Part No.:
- AT49F512-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F512-90JC.pdf
- Description:
- IC FLASH 512KBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,104
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Product details
Overview
AT49F512-90JC from Atmel is a 512 Kbit (64K × 8) single-voltage 5 V-only CMOS Flash memory IC with 90 ns read access time, 10 µs/byte programming, and 10-second chip erase cycle. It features an 8K-byte boot block with hardware lockout, DATA polling, and toggle-bit end-of-cycle detection for embedded firmware storage in microcontroller-based systems.
For engineers reviewing the AT49F512-90JC datasheet, AT49F512-90JC pinout, AT49F512-90JC application, or AT49F512-90JC equivalent, key selection criteria include commercial-grade 0°C–70°C operation, PLCC-32 packaging, 5 V-only reprogrammability without high-voltage circuitry, and boot-sector write protection for secure bootloader code.
Technical Context
The AT49F512-90JC implements a standard parallel Flash architecture with CE/OE/WE control logic enabling EPROM-like read behavior and software-command-driven byte programming and chip erase. Its internal command register interprets six-byte sequences (e.g., 5555h/AAh → 2AAAh/55h → 5555h/80h → …) to initiate erasure or boot-lock activation.
Hardware data protection includes VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored on WE/CE), and dual-line bus control (OE/CE low + WE high for read). The boot block (0000h–1FFFh) supports optional permanent write lockout via verified command sequence, independent of main array operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 512 Kbit (64K × 8), directly addressable via 16-bit A0–A15 bus |
| Read Access Time | 90 ns max - determines minimum CPU wait-state requirement for 8-bit parallel interface |
| Byte Programming Time | 10 µs typical - enables fast field firmware updates without external high-voltage generators |
| Chip Erase Time | 10 seconds max - defines worst-case downtime during full memory reinitialization |
| End-of-Cycle Detection | DATA polling (I/O7 complement) and toggle-bit (I/O6 toggling) - eliminates need for fixed timing delays in host firmware |
| Boot Block Protection | 8K-byte region (0000h–1FFFh) with irreversible lockout via 6-byte command - secures bootloader against accidental overwrite |
| Power Dissipation | 30 mA active current / 100 µA CMOS standby - supports low-power embedded systems with intermittent firmware access |
| Endurance | 10,000 program/erase cycles - qualifies for long-life industrial firmware storage applications |
Pinout & Package
AT49F512-90JC is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), compliant with JEDEC MS-016 AE. Pin 1 is marked by index notch; package dimensions are 1.67″ × 1.64″ (42.4 mm × 41.7 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus supporting full 64K-word decoding; A0 least significant bit |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface for read data output and program data input; high-impedance when deselected |
| CE | Chip Enable | Active-low global enable; must be low with OE low and WE high for valid read access |
| OE | Output Enable | Active-low output gate; controls data bus drive; used with CE for bus contention avoidance |
| WE | Write Enable | Active-low programming control; latches address/data on falling edge (WE or CE, whichever occurs last) |
| VCC | Power Supply | +5 V ±10% supply; powers core logic and I/O drivers; VCC sense disables programming below 3.8 V |
| GND | Ground Reference | Signal and power return path; required for stable 5 V operation and noise immunity |
| NC | No Connect | Three unconnected pins (PLCC positions 1, 2, 31); must remain floating per design |
Key Features
| Feature | Design Value |
|---|---|
| Single 5 V Supply Operation | Eliminates need for dedicated 12 V programming voltage circuitry - simplifies PCB layout and reduces BOM count |
| Hardware Boot Block Lockout | Irreversible 8K-byte protection (0000h–1FFFh) prevents corruption of bootloader code during field firmware updates |
| DATA Polling & Toggle-Bit Detection | Enables deterministic host firmware timing without fixed delays - improves system responsiveness and reliability |
| Internal Program Timer & Command Register | Automates pulse generation and timing for byte programming and chip erase - removes external timing controller requirement |
| CMOS Standby Current ≤100 µA | Supports battery-backed or energy-harvesting embedded systems requiring ultra-low quiescent power |
| VCC Sense & Noise Filtering | Prevents spurious writes during brown-out or EMI events - enhances field robustness in industrial environments |
Applications
| Industrial PLC Firmware Storage | Embedded Network Router Boot Code |
|---|---|
|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile parallel Flash memory providing direct-mapped instruction storage for 8-bit/16-bit microcontrollers with strict 90 ns read timing budget. Use Value: 10,000-cycle endurance and hardware boot lockout ensure reliable multi-year operation without firmware corruption during power interruptions or ESD events. |
Use Scenario: Holding boot loader and fail-safe recovery firmware in network infrastructure equipment where remote firmware upgrades occur infrequently but require absolute integrity. IC Role / Device Role / Timing Role: Secure boot memory with write-protected 8K-byte sector isolating critical startup code from application-level update routines. Use Value: Irreversible boot block lockout prevents accidental overwrites during OTA updates, while 5 V-only operation avoids high-voltage generator complexity in compact router PCBs. |
| Medical Device Diagnostic Software | Automotive Body Control Module Code |
|
Use Scenario: Retaining diagnostic algorithms and calibration tables in portable medical instruments subject to regulatory validation and long service life requirements. IC Role / Device Role / Timing Role: Field-upgradable firmware storage with deterministic end-of-program detection (DATA polling) for validated upgrade protocols. Use Value: 10 µs/byte programming and 10-second chip erase enable rapid in-service recalibration without extended device downtime. |
Use Scenario: Hosting low-level driver code and CAN initialization routines in automotive body control modules operating across -40°C to +85°C industrial range. IC Role / Device Role / Timing Role: Parallel Flash memory interfaced to 8051 or similar MCU with CE/OE/WE control, meeting automotive AEC-Q100 ambient temperature requirements. Use Value: 30 mA active current and 100 µA standby support low-power sleep modes while maintaining fast wake-and-execute capability for real-time CAN message handling. |
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 / 5 V I/O; 90 ns access; 100,000-cycle endurance; no boot block lockout | Lacks hardware-protected boot sector; requires level-shifting for 5 V-only systems | Choose if higher endurance and lower voltage operation are prioritized over boot security |
| SST39VF512-90-4C-NHE | 3.3 V only; 90 ns access; 100,000-cycle endurance; 8K boot block with software lock | Requires 3.3 V supply; boot lock is software-resettable, not irreversible | Choose for modern 3.3 V designs needing higher endurance and flexible boot protection |
Compared with AM29LV512-90JC and SST39VF512-90-4C-NHE, the AT49F512-90JC uniquely delivers irreversible boot block lockout under 5 V-only operation and 10,000-cycle reliability suited for cost-sensitive industrial firmware storage where voltage simplicity and boot integrity outweigh raw endurance metrics.
Availability
AT49F512-90JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded network router boot code, medical device diagnostic software, automotive body control module code, and legacy 5 V microcontroller systems requiring stable component supply across long production lifecycles.
Supply support for AT49F512-90JC 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, Flash memory, and secure authentication devices for industrial, automotive, and consumer applications.
The AT49F512-90JC belongs to Atmel's 5 V-only parallel Flash memory product line, designed specifically for cost-effective, in-system reprogrammable firmware storage in legacy 8-bit and 16-bit embedded systems without high-voltage programming infrastructure.
FAQ
What is the operating temperature range for the AT49F512-90JC?
The AT49F512-90JC is rated for commercial operation from 0°C to +70°C. Its datasheet specifies this range explicitly for the "-90JC" suffix, where "J" denotes PLCC packaging and "C" indicates commercial temperature grade. Industrial variants (e.g., AT49F512-90JI) extend to -40°C to +85°C, but the AT49F512-90JC itself is validated only within the 0°C–70°C envelope.
Does the AT49F512-90JC support true byte-level programming without erasing the entire array first?
Yes, the AT49F512-90JC supports byte-by-byte programming, but only after the target memory location has been erased. Erasure must precede programming because Flash cells can only transition from "1" to "0"; converting "0" back to "1" requires a full sector or chip erase. The AT49F512-90JC allows erasing the entire 512 Kbit array (or 56 Kbytes if boot block lockout is enabled) before selective byte writes.
How is boot block lockout activated and verified on the AT49F512-90JC?
Boot block lockout on the AT49F512-90JC is activated by issuing a precise six-byte command sequence: load AAh to 5555h, 55h to 2AAAh, then 40h to 5555h. Verification is performed in Software Product Identification mode: reading address 00002h returns low on I/O0 if unlockable, high if permanently locked. Once set, the lockout cannot be reversed - a hardware-enforced security feature unique to the AT49F512-90JC.
Can the AT49F512-90JC be used as a direct replacement for standard EPROMs like the 27C512?
The AT49F512-90JC is pin-compatible with the 27C512 in PLCC-32 packaging and shares identical A0–A15, I/O0–I/O7, CE, OE, and WE signal assignments. However, it differs electrically: it requires no UV erasure, uses 5 V-only programming commands, and outputs high-impedance states differently during write cycles. Host firmware must implement Flash-specific command sequences - it is not a drop-in EPROM replacement without software adaptation.
What are the power supply requirements and current consumption specs for the AT49F512-90JC?
The AT49F512-90JC operates strictly at 5 V ±10% (4.5 V–5.5 V). Its active current is 30 mA maximum during read operations at 5 MHz; CMOS standby current is ≤100 µA when CE is high. During chip erase, ICC rises to 90 mA. These values are measured per the datasheet's DC characteristics table and define thermal and regulator sizing requirements for systems integrating the AT49F512-90JC.
AT49F512-90JC 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:
- 50µs
- 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)
AT49F512-90JC FAQ
1.How can I place an order for AT49F512-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F512-90JC 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 AT49F512-90JC reliable?
The price and inventory of AT49F512-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F512-90JC is usually 5 days.
3.What payment methods are accepted for AT49F512-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F512-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F512-90JC?
AT49F512-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F512-90JC 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 AT49F512-90JC?
For technical support, including AT49F512-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F512-90JC requirements.
6.How does Aetrix verify that AT49F512-90JC is sourced from the original manufacturer or authorized distributors?
All AT49F512-90JC 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 AT49F512-90JC meets industry standards.
7.What is the process for return or replacement of AT49F512-90JC?
All AT49F512-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F512-90JC, 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 AT49F512-90JC part is unused and in its original packaging.
Return procedure for AT49F512-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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