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Microchip Technology AT49F002N-90JI
- Part No.:
- AT49F002N-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002N-90JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,777
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Product details
Overview
AT49F002N-90JI from Atmel is a 2-Mbit (256K × 8) 5V-only in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It delivers 55 ns read access time, supports byte-by-byte programming at 10 µs/byte typical, features sector architecture with 16K-byte boot block and hardware data protection, and operates across -40°C to +85°C industrial temperature range.
For engineers reviewing the AT49F002N-90JI datasheet, AT49F002N-90JI pinout, AT49F002N-90JI application, or AT49F002N-90JI equivalent, key selection criteria include industrial-grade temperature support, boot block lockout capability, 5V-only operation without high-voltage programming, fast 10-second erase cycle, and compatibility with standard EPROM-like CE/OE/WE bus interface timing.
Technical Context
The AT49F002N-90JI implements a sector-erasable Flash architecture with one 16K-byte boot block (address 00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes). Its command-based operation uses six-cycle sequences for chip/sector erase and four-cycle sequences for byte programming, all executed via standard microprocessor write timing with address/data latched on WE/CE edges.
Hardware protection includes VCC sense (<3.8V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibition (OE low, CE high, or WE high blocks writes). Data polling (I/O7 complement) and toggle bit (I/O6 toggling) provide real-time program/erase status detection without external clocks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - supports full firmware image storage for 8-bit microcontrollers. |
| Read Access Time | 90 ns max - meets timing requirements for 11 MHz Z80 or 8051-based systems with standard wait-state logic. |
| Byte Programming Time | 10 µs typical - enables rapid field updates of configuration parameters without system interruption. |
| Erase Cycle Time | 10 seconds max - allows full-chip or sector erase within interactive diagnostic or bootloader update windows. |
| Endurance | 10,000 write/erase cycles - ensures reliable operation over 5+ years in industrial logging or calibration data applications. |
| Operating Voltage | 5.0 V ±10% - eliminates need for dedicated programming voltage regulators in 5V system designs. |
| Temperature Range | -40°C to +85°C - qualified for industrial control panels, motor drives, and outdoor metering equipment. |
| Standby Current | 100 µA CMOS - enables low-power sleep modes in battery-backed instrumentation. |
Pinout & Package
AT49F002N-90JI is supplied in a 32-lead Plastic J-leaded Chip Carrier (PLCC) package (JEDEC MS-016 AE), with lead pitch 1.27 mm and body size 18.5 × 18.5 mm. Pin 1 is marked by index notch; pin 1 is DC (no connect) per datasheet specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A16 used for standard access, A17 selects upper/lower half in extended modes. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path compatible with 8051, Z80, and 68K microprocessor buses; high-impedance during standby/read disable. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; controls device selection in multi-chip memory maps. |
| OE | Output Enable | Active-low output gate; used with CE to prevent bus contention during shared-memory arbitration or partial decode scenarios. |
| WE | Write Enable | Active-low write strobe; latches address/data during programming/erase command sequences; timing-critical for command recognition. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-impedance outputs; 12V override enables boot block reprogramming when lockout is active. |
| VCC / GND | Power Supply | Single 5V supply with decoupling required near pins; GND plane integrity critical for noise immunity during erase/program pulses. |
| DC | No Connect | Pin 1 is internally unconnected - must remain floating; no pull-up/down or routing required on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16K-byte boot sector (00000H–03FFFH) can be permanently write-protected to preserve bootloader integrity during field firmware updates. |
| 5V-Only Reprogrammability | Eliminates need for 12V programming supplies or charge pumps - simplifies power design and reduces BOM cost in 5V-only systems. |
| Data Polling & Toggle Bit | Real-time program/erase completion detection via I/O7 complement or I/O6 toggling - removes dependency on fixed delay timers in host firmware. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibition prevent accidental writes during power transients or EMI events - improves field reliability. |
| Industrial Temperature Rating | Qualified from -40°C to +85°C - suitable for deployment in factory automation, energy meters, and transportation electronics without derating. |
| Standard EPROM-Compatible Interface | Uses CE/OE/WE control signals identical to UV-EPROMs - enables drop-in replacement in legacy designs with minimal layout changes. |
Applications
| Industrial PLC Firmware Storage | Automotive Diagnostic Module Code |
|---|---|
Use Scenario: Storing ladder logic firmware and configuration tables in programmable logic controllers deployed in manufacturing lines. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability for remote firmware patches and version upgrades. Use Value: Boot block lockout prevents corruption of core runtime engine while allowing safe parameter and HMI update via sector erase. | Use Scenario: Holding OBD-II protocol stack and vehicle-specific calibration data in handheld diagnostic tools used in service garages. IC Role / Device Role / Timing Role: Field-updatable flash memory interfaced to ARM7 or PIC microcontroller via 8-bit parallel bus. Use Value: 90 ns read access enables real-time response to CAN bus query commands without CPU wait states. |
| Medical Device Configuration Memory | Point-of-Sale Terminal Bootloader |
Use Scenario: Retaining user-adjustable therapy parameters and audit logs in portable infusion pumps requiring regulatory-compliant data retention. IC Role / Device Role / Timing Role: Secure, endurance-rated nonvolatile storage with hardware write protection against unintended modification. Use Value: 10,000-cycle endurance and 100 µA standby current support battery-powered operation over 2-year service intervals. | Use Scenario: Hosting secure bootloader code that validates signed application images before execution in retail payment terminals. IC Role / Device Role / Timing Role: Trusted boot memory with immutable boot sector enforced by hardware lockout feature. Use Value: RESET-pin 12V override allows authorized recovery of corrupted bootloader without chip replacement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV002BT-90EC | 3V/5V dual-voltage operation; 90 ns access; 2 Mbit density; requires 12V for reset recovery. | Lacks dedicated boot block lockout; uses different command set and sector map (64K boot). | Select if system already supports 3V logic or requires voltage flexibility; verify command sequence compatibility before migration. |
| SST39VF200A-90-4C-NHE | 3.3V-only; 90 ns access; 2 Mbit; built-in auto-select ID and page-mode programming. | No RESET pin; no 12V override; boot block protection implemented via software register only. | Prefer for new 3.3V designs where lower power and smaller footprint outweigh need for industrial temp and hardware lockout. |
Compared with AM29LV002BT-90EC and SST39VF200A-90-4C-NHE, the AT49F002N-90JI uniquely combines industrial temperature rating, hardware-enforced boot block lockout with 12V override, and strict 5V-only operation - making it optimal for legacy 5V industrial systems requiring field-recoverable trusted boot.
Availability
AT49F002N-90JI is available at Aetrix Electronics and suitable for industrial control, automotive diagnostics, medical instrumentation, and point-of-sale terminal designs requiring stable component supply and long-term obsolescence management.
Supply support for AT49F002N-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 manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication devices.
The AT49F002N series belongs to Atmel's legacy parallel-interface Flash memory product line, designed specifically for in-system reprogrammability in 5V microcontroller-based embedded systems requiring robust code storage and field-upgrade capability.
FAQ
What is the maximum operating temperature range for the AT49F002N-90JI?
The AT49F002N-90JI is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the "DC and AC Operating Range" table on page 6 of the datasheet, where the "-90JI" suffix explicitly denotes the industrial-grade variant with 90 ns access time and extended thermal qualification.
Does the AT49F002N-90JI require a high-voltage programming supply?
No, the AT49F002N-90JI operates with 5V-only programming - no external 12V or higher voltage is needed for standard byte programming or sector erasure. The 12V signal applied to the RESET pin is solely for overriding the boot block lockout feature and is not used during normal programming cycles.
What is the function of the DC (Don't Connect) pin on the AT49F002N-90JI PLCC package?
Pin 1 on the AT49F002N-90JI PLCC package is designated DC (Don't Connect) and is internally unconnected. Per the datasheet Pin Configurations section, this pin must remain floating - no PCB trace, pull-up, pull-down, or grounding is permitted, as connection could compromise device functionality or reliability.
How does the boot block lockout feature work on the AT49F002N-90JI?
The AT49F002N-90JI boot block lockout prevents reprogramming of the 16K-byte sector (00000H–03FFFH) after activation via a six-command sequence. Once enabled, writes to this region are blocked at 5V levels; only applying 12V to the RESET pin allows override for recovery - a hardware-enforced security mechanism unique to this part.
Can the AT49F002N-90JI be used as a direct replacement for standard EPROMs like the 27C256?
Yes, the AT49F002N-90JI is pin-compatible and functionally compatible with 27C256 EPROMs in read mode, using identical CE/OE/WE control signaling and 8-bit data bus. However, programming requires command sequences instead of UV erasure, and the AT49F002N-90JI supports in-system reprogramming without removal from the board.
AT49F002N-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:
- 2Mbit
- Memory Organization:
- 256K 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F002N-90JI FAQ
1.How can I place an order for AT49F002N-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002N-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 AT49F002N-90JI reliable?
The price and inventory of AT49F002N-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002N-90JI is usually 5 days.
3.What payment methods are accepted for AT49F002N-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002N-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002N-90JI?
AT49F002N-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002N-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 AT49F002N-90JI?
For technical support, including AT49F002N-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002N-90JI requirements.
6.How does Aetrix verify that AT49F002N-90JI is sourced from the original manufacturer or authorized distributors?
All AT49F002N-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 AT49F002N-90JI meets industry standards.
7.What is the process for return or replacement of AT49F002N-90JI?
All AT49F002N-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002N-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 AT49F002N-90JI part is unused and in its original packaging.
Return procedure for AT49F002N-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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