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Microchip Technology AT49F002-55JC
- Part No.:
- AT49F002-55JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002-55JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,581
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Product details
Overview
AT49F002-55JC from Atmel is a 2-Mbit (256K × 8) 5V-only Flash memory IC used for nonvolatile program/data storage in embedded microcontroller systems. It delivers 55 ns read access time, supports byte-by-byte programming (10 µs/byte typical), features sector-based erase architecture with 16K-byte boot block lockout, and operates across commercial temperature range (0°C to 70°C) in PLCC-32 package.
For engineers reviewing the AT49F002-55JC datasheet, AT49F002-55JC pinout, AT49F002-55JC application, or AT49F002-55JC equivalent, this page provides verified technical context, validated pin functions, real-world use cases in firmware storage and parameter retention, and confirmed alternative parts with documented functional differences.
Technical Context
The AT49F002-55JC implements a standard parallel Flash interface with CE/OE/WE control logic and internal command register for software-controlled erase and programming. Its sector architecture includes one 16K-byte boot block (address 00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (96K + 128K bytes), enabling selective reprogramming without full-chip erase.
It uses hardware data protection including VCC sense (<3.8V inhibits programming), noise filtering on WE/CE inputs (<15 ns pulses ignored), and dual-line bus control (CE+OE low for read). Boot block lockout is enabled via six-cycle command sequence and can be overridden only by applying 12V to RESET - a feature absent in N(T) variants but confirmed for AT49F002-55JC.
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 MCUs. |
| Read Access Time | 55 ns max - enables direct execution from flash (XIP) in timing-critical 5 MHz bus systems. |
| Byte Programming Time | 10 µs typical - allows rapid field updates of configuration parameters without system interruption. |
| Erase Cycle Time | 10 seconds max for full chip - supports in-system reprogramming during maintenance windows. |
| End-of-Program Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delay timers in host firmware. |
| Power Dissipation | 50 mA active current / 100 µA CMOS standby - suitable for low-power industrial controllers with sleep modes. |
| Endurance | 10,000 write/erase cycles - sufficient for firmware revision management over 5+ year product lifecycle. |
Pinout & Package
AT49F002-55JC is housed in a 32-lead Plastic J-leaded Chip Carrier (PLCC) package, pin-compatible with industry-standard 32J footprint. Pin 1 is marked by index notch; pin 9 is NC (no connect) per datasheet Rev. 1017D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A16/A17 used for sector selection in erase commands. |
| I/O0–I/O7 | Data Inputs/Outputs | Bi-directional 8-bit data bus; I/O7 used for DATA polling, I/O6 for Toggle Bit status indication. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; controls device selection on shared bus. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high to prevent bus contention. |
| WE | Write Enable | Active-low write strobe; latches address/data during programming/erase command sequences; edge-triggered timing critical for command entry. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; 12V input enables boot block override - unique to non-N(T) variants like AT49F002-55JC. |
| VCC | Power Supply | +5V ±10% supply; VCC sense circuitry disables programming if voltage drops below ~3.8V. |
| GND | Ground | Reference ground for all signals and power; decoupling capacitor required within 1 cm of VCC/GND pins. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V supply operation | Eliminates need for +12V programming voltage - simplifies power design and enables true in-system reprogramming via standard MCU GPIOs. |
| Boot block programming lockout | 16K-byte protected region (00000H–03FFFH) prevents accidental overwrite of bootloader code; lock enabled via verified 6-cycle command sequence. |
| Sector erase architecture | Independent erasure of parameter blocks (8K each) and main memory blocks (96K/128K) - enables modular firmware updates without full-chip erase latency. |
| Hardware data protection | VCC sense, noise filtering, and control-line interlock (OE high/CE high/WE high) prevent spurious writes during power transients or EMI events. |
| DATA polling & Toggle Bit | Dual asynchronous end-of-program detection methods - allows host firmware to poll status without fixed delays or external clocks. |
Applications
| Industrial PLC Firmware Storage | Automotive ECU Parameter Retention |
|---|---|
Use Scenario: Storing boot loader and application firmware in programmable logic controllers with field-upgrade capability. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped into MCU address space; 55 ns access enables zero-wait-state execution. Use Value: Boot block lockout ensures bootloader integrity during remote firmware updates; sector erase allows patching of runtime parameters without disrupting core logic. |
Use Scenario: Retaining calibration data, fault logs, and adaptive learning values in engine control units across vehicle lifetime. IC Role / Device Role / Timing Role: Parameter memory accessed via SPI-to-parallel bridge or dedicated MCU interface; 10 µs/byte programming supports fast logging during CAN message bursts. Use Value: Dual 8K parameter blocks enable A/B swapping for atomic updates; 10,000-cycle endurance exceeds automotive OEM requirements for 15-year service life. |
| Medical Device Configuration Memory | Networking Equipment Boot Image Storage |
Use Scenario: Holding regulatory-compliant device configurations (e.g., safety thresholds, user profiles) in FDA-cleared diagnostic instruments. IC Role / Device Role / Timing Role: Secure configuration store with hardware write protection; RESET-driven 12V override enables authorized service-mode reprogramming. Use Value: Boot block lockout prevents unauthorized modification of safety-critical startup routines; CMOS standby current (100 µA) supports battery-backed operation during power loss. |
Use Scenario: Storing primary and fallback boot images in enterprise switches/routers requiring fail-safe firmware recovery. IC Role / Device Role / Timing Role: Dual-main-memory-block architecture (96K + 128K) supports mirrored boot images; sector erase enables background update of secondary image. Use Value: Full chip erase (10 s) completes within watchdog timeout window; DATA polling allows precise synchronization of image validation post-write. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV002BT-55EC | 3V/5V tolerant, 55 ns access, 2 Mbit, boot block at top (3C000H–3FFFFH); no 12V RESET override. | Requires separate 3.3V supply rail; boot block location differs - incompatible address mapping for legacy AT49F002-55JC firmware. | Select if migrating to 3.3V systems; verify bootloader relocation and remove 12V RESET circuitry. |
| SST39VF020-55-4C-NHE | 3.3V-only, 55 ns access, 2 Mbit, uniform 4K sectors; no dedicated boot block or RESET override. | Lacks hardware boot protection; requires software-managed sector locking; incompatible voltage domain. | Choose for cost-sensitive 3.3V designs where boot security is handled in firmware; not drop-in replaceable. |
Compared with AM29LV002BT-55EC and SST39VF020-55-4C-NHE, the AT49F002-55JC uniquely supports 5V-only operation with hardware-enforced boot block protection and 12V-enabled override - critical for legacy industrial systems requiring guaranteed bootloader integrity and field-service flexibility.
Availability
AT49F002-55JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive ECU parameter retention, and medical device configuration memory requiring stable component supply and long-term obsolescence management.
Supply support for AT49F002-55JC 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.
The AT49F002 series was designed as a 5V-only, in-system reprogrammable Flash memory for embedded systems requiring reliable firmware storage with hardware-level boot protection and sector granularity - targeting industrial control, automotive, and medical applications.
FAQ
What is the operating temperature range for AT49F002-55JC?
The AT49F002-55JC is rated for commercial temperature operation from 0°C to 70°C. This is specified in the Ordering Information table (Rev. 1017D, page 12), where "-55JC" denotes 55 ns access time and "C" suffix indicates commercial grade. Industrial variants (e.g., AT49F002-55JI) exist but AT49F002-55JC itself is strictly commercial.
Does AT49F002-55JC support 12V programming or only 5V operation?
AT49F002-55JC supports 5V-only operation for normal read and programming functions. However, its RESET pin accepts 12V ±0.5V to override boot block lockout - a feature explicitly confirmed for non-N(T) variants in the "Boot Block Programming Lockout Override" section (page 4). This 12V signal does not program the device but enables reprogramming of the protected boot sector.
What package type is used for AT49F002-55JC?
AT49F002-55JC uses a 32-lead Plastic J-leaded Chip Carrier (PLCC) package, designated as "32J" in Atmel's ordering information (page 12). The datasheet provides mechanical drawings for this JEDEC MS-016 AE compliant package, including pin 1 index marking and NC pin (pin 9) identification.
How is boot block protection enabled on AT49F002-55JC?
Boot block protection on AT49F002-55JC is enabled via a six-cycle command sequence: load AAH to 5555H, 55H to 2AAAH, then 40H to 5555H (page 11). Once executed, the 16K-byte boot block (00000H–03FFFH) becomes permanently write-protected at ≤5.5V. Protection status can be verified by reading bit I/O0 at address 00002H in software product ID mode.
What are the key timing parameters for byte programming in AT49F002-55JC?
AT49F002-55JC specifies a typical byte programming time (tBP) of 10 µs, with maximum 50 µs (page 9). Valid timing requires address setup/hold times ≥0 ns / ≥50 ns, data setup/hold ≥50 ns / ≥0 ns, and WE pulse width ≥90 ns. End-of-program detection is supported via DATA polling (I/O7 complement) or Toggle Bit (I/O6 toggling).
AT49F002-55JC 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:
- 55 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)
AT49F002-55JC FAQ
1.How can I place an order for AT49F002-55JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002-55JC 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 AT49F002-55JC reliable?
The price and inventory of AT49F002-55JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002-55JC is usually 5 days.
3.What payment methods are accepted for AT49F002-55JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002-55JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002-55JC?
AT49F002-55JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002-55JC 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 AT49F002-55JC?
For technical support, including AT49F002-55JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002-55JC requirements.
6.How does Aetrix verify that AT49F002-55JC is sourced from the original manufacturer or authorized distributors?
All AT49F002-55JC 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 AT49F002-55JC meets industry standards.
7.What is the process for return or replacement of AT49F002-55JC?
All AT49F002-55JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002-55JC, 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 AT49F002-55JC part is unused and in its original packaging.
Return procedure for AT49F002-55JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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