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Microchip Technology AT49F002ANT-55JI
- Part No.:
- AT49F002ANT-55JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002ANT-55JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F002ANT-55JI from Microchip Technology (formerly 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, 20 µs/byte programming, 4-second chip erase, 10,000 write cycles, and features sector-based architecture with boot-block lockout - deployed in industrial firmware update modules and legacy BIOS storage.
For engineers reviewing the AT49F002ANT-55JI datasheet, AT49F002ANT-55JI pinout, AT49F002ANT-55JI application, or AT49F002ANT-55JI equivalent, key selection criteria include its PLCC-32 package, single 5V supply operation, hardware data protection (VCC sense, noise filter), DATA polling/toggle bit end-of-cycle detection, and boot block address range at 3C000H–3FFFFH.
Technical Context
The AT49F002ANT-55JI implements a standard parallel Flash interface with CE/OE/WE control logic and operates as a drop-in EPROM replacement. Its internal program controller manages byte programming and sector/chip erase via six-cycle command sequences without external high-voltage support.
It uses CMOS nonvolatile technology with dedicated boot block (16K bytes, 3C000H–3FFFFH), two 8K parameter blocks, and four main memory blocks (32K + 3×64K). The RESET pin enables boot block override at 12V - though this feature is explicitly disabled in the AT49F002AN(T) variant per datasheet Section 4.3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), enabling full firmware images for 8-bit MCUs with ≤256KB code space |
| Read Access Time | 55 ns - meets timing for 18 MHz bus interfaces without wait states |
| Byte Programming Time | 20 µs typical - supports field firmware patching at ~50 KB/s effective throughput |
| Chip Erase Time | 4 seconds max - enables full reprogramming within interactive diagnostic cycles |
| Endurance | 10,000 program/erase cycles - sufficient for infrequent field updates over 10+ year product life |
| Operating Voltage | 5.0 V ±10% - compatible with legacy 5V logic families and eliminates dual-supply design complexity |
| Standby Current | 100 µA CMOS - suitable for low-power industrial controllers in sleep mode |
Pinout & Package
AT49F002ANT-55JI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package (JEDEC MS-016, Variation AE), measuring 12.5 mm × 12.5 mm × 3.5 mm, with gull-wing leads and Pin 1 identifier corner. Pin 1 is NC (no connect) per datasheet Section 2.1 and Table 27.1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A11 is don't-care in command cycles |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; I/O7 used for DATA polling, I/O6 for toggle-bit status monitoring |
| CE | Chip Enable | Active-low chip select; must be low with OE low for read, high to enter standby (100 µA) |
| OE | Output Enable | Active-low output gate; controls data bus float state to prevent contention during shared-bus operation |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command cycle timing |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; 12V override disabled in AT49F002AN(T) variant |
| VCC | Power Supply | +5.0 V ±10%; internal VCC sense disables programming if voltage drops below 3.8 V |
| GND | Ground Reference | Signal and power return; decoupling capacitor required near VCC pin per layout guidelines |
| Pin 1 | No Connect | Physically present but unconnected die bond pad; must remain floating or tied to GND per design rules |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | Enables selective erase of boot (16K), parameter (2×8K), or main memory (32K+3×64K) blocks - critical for safe firmware updates without corrupting bootloader |
| Boot Block Lockout | Hardware-enforced write protection for 3C000H–3FFFFH region; once enabled, prevents accidental overwrite of secure startup code under 5.5V operation |
| DATA Polling & Toggle Bit | Real-time program/erase completion detection via I/O7 complement or I/O6 toggling - eliminates need for fixed delay timers in host firmware |
| Hardware Data Protection | VCC sense, WE/CE/OE inhibit logic, and 15 ns noise filtering prevent spurious writes - reduces system-level ESD/fault recovery complexity |
| Green Packaging | Pb/halide-free PLCC option available (e.g., AT49F002ANT-55JU) - satisfies RoHS compliance for industrial OEM shipments |
Applications
| Industrial PLC Firmware Storage | Legacy Automotive ECU Bootloader |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers operating in -40°C to +85°C environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with 55 ns read access synchronized to 8-bit microcontroller buses; boot block holds immutable startup routines. Use Value: Sector erase allows field updates to application code while preserving bootloader integrity; 10,000-cycle endurance supports 5+ years of scheduled maintenance cycles. | Use Scenario: Hosting boot code and calibration tables in pre-2010 automotive engine control units where 5V-only supply and PLCC packaging are mandated. IC Role / Device Role / Timing Role: EPROM-replacement Flash memory interfaced directly to Motorola 68HC11 derivatives; RESET pin used for diagnostic reinitialization. Use Value: Hardware lockout prevents corruption of safety-critical boot code during CAN-based firmware downloads; 4-second chip erase enables rapid recalibration in service bays. |
| Medical Device Configuration Memory | Point-of-Sale Terminal BIOS |
Use Scenario: Retaining device-specific calibration coefficients and regulatory settings across power cycles in Class II medical instruments. IC Role / Device Role / Timing Role: Parameter block (8K × 2) stores user-adjustable thresholds and sensor offsets; accessed via polled I/O during power-up self-test. Use Value: Byte-programmability enables per-unit calibration write-once-after-manufacturing; 100 µA standby current extends battery backup runtime during idle periods. | Use Scenario: Storing BIOS and peripheral initialization code in retail POS terminals requiring field-upgradable firmware without hardware redesign. IC Role / Device Role / Timing Role: Main memory block (32K+3×64K) hosts boot ROM and driver modules; addressed by x86-compatible southbridge using standard CE/OE/WE protocol. Use Value: PLCC-32 package allows socketed replacement in deployed units; 5V-only operation avoids adding 12V programming circuitry to cost-sensitive designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV002BT-55RE | 3V core with 5V I/O tolerance; 70 ns read; no boot block lockout; 100,000 endurance cycles | Requires level-shifting for pure 5V systems; lacks hardware-protected boot region | Select when migrating to lower-power 3.3V domains and higher endurance is prioritized over boot security |
| SST39VF020-55-4C-NHE | 3.3V supply only; 55 ns read; 100,000 cycles; software-controlled block protection | Incompatible with 5V bus voltages; protection relies on command sequence, not hardware lockout | Choose for new 3.3V designs needing higher endurance and smaller TSOP packaging - not for 5V legacy replacement |
Compared with AM29LV002BT-55RE and SST39VF020-55-4C-NHE, the AT49F002ANT-55JI uniquely provides 5V-native operation, hardware-enforced boot block lockout, and PLCC-32 compatibility - making it the only viable option for maintaining legacy 5V industrial systems without PCB redesign.
Availability
AT49F002ANT-55JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy automotive ECU bootloader retention, and medical device configuration memory requiring stable component supply across extended product lifecycles.
Supply support for AT49F002ANT-55JI 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
Microchip Technology acquired Atmel in 2016 and maintains legacy Flash product support, manufacturing, and documentation for industrial and automotive applications.
The AT49F002A(N)(T) series was designed specifically for 5V in-system reprogrammable firmware storage in resource-constrained embedded systems - emphasizing reliability, sector-level granularity, and hardware data protection over raw speed or density.
FAQ
What is the boot block address range for AT49F002ANT-55JI?
The boot block address range for AT49F002ANT-55JI is 3C000H to 3FFFFH (16K bytes), as confirmed in Section 4.6 and Note 3 of the datasheet. This differs from the base AT49F002A(N) variant (00000H–03FFFH) and is specific to the "T" suffix configuration. The AT49F002ANT-55JI uses this upper-address boot sector to isolate critical startup code from main memory updates.
Does AT49F002ANT-55JI support 12V RESET override for boot block reprogramming?
No, AT49F002ANT-55JI does not support 12V RESET override. Section 4.3 explicitly states "The RESET feature is not available for the AT49F002AN(T)", and AT49F002ANT-55JI falls under that variant family. Unlike the AT49F002A(T), the "N" in AT49F002ANT-55JI denotes the absence of RESET-based boot block override - meaning once lockout is enabled, the boot block is permanently protected under all voltage conditions ≤5.5V.
What package type is used for AT49F002ANT-55JI?
AT49F002ANT-55JI uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, designated "32J" in the ordering table (Section 27.1). Its dimensions are 12.5 mm × 12.5 mm × 3.5 mm, JEDEC MS-016 compliant, with Pin 1 identified by corner chamfer and defined as NC (no connect) per datasheet Figure 2.1 and Table 27.1.
How is end-of-program detection implemented in AT49F002ANT-55JI?
AT49F002ANT-55JI supports two hardware-assisted end-of-program detection methods: DATA polling (reading I/O7 returns complement of written data until completion, then true data) and Toggle Bit (I/O6 toggles between 0/1 during operation and stabilizes upon completion). Both are usable at any point during programming and eliminate reliance on fixed tBP timing - enabling deterministic host firmware control for AT49F002ANT-55JI.
Is AT49F002ANT-55JI RoHS-compliant?
Yes, AT49F002ANT-55JI is RoHS-compliant. The datasheet confirms green (Pb/halide-free) packaging is available for this part number, with ordering codes ending in "JU", "TU", or "VU" (Section 27.2). While AT49F002ANT-55JI itself uses standard leaded PLCC, the same die and process support RoHS variants - and Aetrix Electronics supplies both compliant and legacy versions with full traceability.
AT49F002ANT-55JI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F002ANT-55JI FAQ
1.How can I place an order for AT49F002ANT-55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002ANT-55JI 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 AT49F002ANT-55JI reliable?
The price and inventory of AT49F002ANT-55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002ANT-55JI is usually 5 days.
3.What payment methods are accepted for AT49F002ANT-55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002ANT-55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002ANT-55JI?
AT49F002ANT-55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002ANT-55JI 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 AT49F002ANT-55JI?
For technical support, including AT49F002ANT-55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002ANT-55JI requirements.
6.How does Aetrix verify that AT49F002ANT-55JI is sourced from the original manufacturer or authorized distributors?
All AT49F002ANT-55JI 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 AT49F002ANT-55JI meets industry standards.
7.What is the process for return or replacement of AT49F002ANT-55JI?
All AT49F002ANT-55JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002ANT-55JI, 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 AT49F002ANT-55JI part is unused and in its original packaging.
Return procedure for AT49F002ANT-55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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