My Inquiry
My Account
Microchip Technology AT49F002AT-55JI
- Part No.:
- AT49F002AT-55JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002AT-55JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,265
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT49F002AT-55JI from Atmel is a 2 Mbit (256K × 8) single-voltage 5V-only Flash memory IC with 55 ns read access time, 20 µs/byte programming, and sector-erase architecture including one 16K-byte boot block (address range 3C000H–3FFFFH), two 8K-byte parameter blocks, and four main memory blocks. It supports in-system reprogramming without high-voltage inputs and is used in embedded firmware storage for industrial microcontroller systems requiring secure boot code retention.
For engineers reviewing the AT49F002AT-55JI datasheet, AT49F002AT-55JI pinout, AT49F002AT-55JI application, or AT49F002AT-55JI equivalent, key selection considerations include boot block lockout behavior at ≤5.5V, RESET-pin-based override capability (12V), sector erase timing (4 s max), DATA polling/toggle bit status detection, and PLCC-32 package compatibility with industrial temperature range (−40°C to +85°C).
Technical Context
The AT49F002AT-55JI implements a command-register-based architecture for byte programming and sector/chip erase, using standard CE/OE/WE control lines compatible with EPROM interfaces. Its internal program timer eliminates external timing components, and hardware data protection includes VCC sense (<3.8V inhibition), noise filtering (<15 ns pulse rejection), and control-line gating (OE low/CE high/WE high disables programming).
Boot block programming lockout is enabled via a six-cycle command sequence; once activated, the 16K-byte boot sector (3C000H–3FFFFH) becomes permanently write-protected under ≤5.5V operation. Protection override requires 12V ±0.5V applied to RESET - a feature absent in AN(T) variants but confirmed present in AT and ANT variants per datasheet Section 4.3 and Note 6.
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 mid-complexity microcontrollers. |
| Read Access Time | 55 ns - enables direct execution from flash (XIP) in systems with ≤18 MHz bus clocks. |
| Byte Programming Time | 20 µs typical - allows rapid field updates of configuration parameters or calibration data without system downtime. |
| Erase Cycle Time | 4 seconds maximum - supports efficient in-field firmware patching via sector erase without full chip reprogramming. |
| 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 | 30 mA active current / 100 µA CMOS standby - suitable for low-power industrial controllers with sleep/wake cycles. |
| Write Endurance | 10,000 program/erase cycles - validated for applications requiring infrequent but reliable firmware updates over 10+ year product life. |
Pinout & Package
AT49F002AT-55JI is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package (JEDEC MS-016, Variation AE), measuring 12.32 mm × 12.32 mm × 3.35 mm (max height), with pin 1 identifier marked on top surface. Pin 1 is NC for TSOP/VSOP variants but functional in PLCC.
| 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 per Note 1. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; gates all internal operations. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high, preventing bus contention. |
| WE | Write Enable | Active-low write strobe; latches address/data during programming/erase command sequences; controls timing of bus cycles. |
| RESET | Reset Input | Active-low reset halts ongoing operations; 12V ±0.5V input overrides boot block lockout - unique to AT/ANT variants. |
| I/O0–I/O7 | Data Bus | Bidirectional 8-bit data interface; carries command codes, device IDs, and user data; supports DATA polling on I/O7 and toggle bit on I/O6. |
| VCC | Power Supply | +5V ±10% supply; powers core logic and I/O buffers; VCC sense circuitry inhibits programming if voltage drops below 3.8V. |
| GND | Ground | Reference node for all signals and power; decoupling capacitor required within 10 mm of VCC/GND pins per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Single-Voltage 5V Operation | Eliminates need for dual-supply or charge-pump circuitry - reduces BOM count and PCB area in cost-sensitive industrial designs. |
| Boot Block Programming Lockout | Hardware-enforced write protection for 16K-byte boot sector (3C000H–3FFFFH); prevents accidental corruption of bootloader code during field updates. |
| RESET-Pin Override Capability | 12V ±0.5V on RESET pin temporarily disables boot block lockout - enables recovery of corrupted boot code without device replacement. |
| Sector-Erase Architecture | Independent erasure of two 8K-byte parameter blocks and four main memory blocks (32K/64K/64K/64K) - minimizes update latency and wear leveling overhead. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line gating prevent spurious writes - critical for reliability in electrically noisy factory-floor environments. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing firmware images and configuration tables in programmable logic controllers deployed in factory automation systems. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with secure boot block protecting startup routines; 55 ns access enables real-time instruction fetch during motion control loops. Use Value: Boot block lockout ensures bootloader integrity across 10,000+ field updates; sector erase allows parameter block updates without disturbing main application code. | Use Scenario: Holding certified bootloader and safety-critical initialization code in FDA-regulated diagnostic equipment with audit-trail requirements. IC Role / Device Role / Timing Role: Secure boot memory with RESET-pin override for emergency recovery; 100 µA standby current extends battery-backed operation during maintenance mode. Use Value: 12V RESET override provides certified recovery path for bootloader corruption; green (Pb/halide-free) packaging meets IEC 61000-6-4 medical EMI standards. |
| Automotive Body Control Module | Telecom Remote Node Configuration |
Use Scenario: Storing vehicle-specific calibration maps and CAN protocol stacks in body control units operating across −40°C to +85°C. IC Role / Device Role / Timing Role: In-system reprogrammable flash with industrial temp grade; boot block holds OEM-locked CAN stack; parameter blocks store regional settings. Use Value: Sector erase isolates calibration updates from firmware upgrades; 4-second erase time meets OTA update latency targets under ISO 26262 ASIL-B constraints. | Use Scenario: Hosting field-upgradable configuration profiles and encryption keys in remote base station management modules. IC Role / Device Role / Timing Role: Parameter storage with hardware write protection; DATA polling enables deterministic host firmware response during key rotation events. Use Value: Toggle bit (I/O6) provides asynchronous erase completion signal - avoids polling delays in time-sensitive SNMP trap generation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF020-55-4C-NHE | 55 ns access, 2 Mbit, 3.3V core (5V tolerant I/O), no RESET-based boot override | Lacks 12V RESET override; boot protection relies solely on software lock bits | Select when 3.3V system integration is required and boot recovery via external programmer is acceptable. |
| MX29LV020TC-55G | 55 ns access, 2 Mbit, 3.0–3.6V supply only, no 5V operation support | Requires level-shifting for 5V buses; no VCC sense or noise filtering features | Choose for new 3.3V designs where lower active current (15 mA) outweighs loss of 5V compatibility and hardware protection. |
Compared with SST39VF020-55-4C-NHE and MX29LV020TC-55G, the AT49F002AT-55JI uniquely combines 5V-only operation, hardware-enforced boot block lockout with 12V RESET override, and robust noise immunity - making it the sole option for legacy 5V industrial systems requiring certified bootloader recovery paths.
Availability
AT49F002AT-55JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, automotive body control module calibration, telecom remote node configuration, and embedded instrumentation requiring stable component supply across extended product lifecycles.
Supply support for AT49F002AT-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
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and security ICs, with design centers across the US, Europe, and Asia.
The AT49F002A(N)(T) family was developed for cost-sensitive, 5V industrial systems needing secure, in-system reprogrammable firmware storage with hardware-enforced boot protection and field-recovery capability.
FAQ
What is the boot block address range for AT49F002AT-55JI?
The boot block for AT49F002AT-55JI occupies addresses 3C000H to 3FFFFH (16K bytes), distinct from the AT49F002A(N) variant which uses 00000H–03FFFH. This relocation supports top-boot architecture for systems requiring execution from highest memory addresses. The AT49F002AT-55JI datasheet confirms this mapping in Section 4.6 and Note 3.
Does AT49F002AT-55JI support 12V RESET override for boot block programming?
Yes, AT49F002AT-55JI supports 12V ±0.5V applied to the RESET pin to temporarily disable boot block lockout - enabling chip/sector erase or byte programming of the protected region. This feature is explicitly documented in Section 4.3 and Note 6 of the AT49F002A(N)(T) datasheet and is absent only in AN(T) variants.
What package type is used for AT49F002AT-55JI?
AT49F002AT-55JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package (ordering code suffix "J"), per Section 27.1 and Drawing 28.1. Dimensions are 12.32 mm × 12.32 mm × 3.35 mm max, JEDEC MS-016 compliant, with pin 1 identifier marked on top surface.
How does AT49F002AT-55JI detect end-of-program without external timing?
AT49F002AT-55JI provides two hardware methods: DATA polling (I/O7 returns complement of written data until completion, then true data) and toggle bit (I/O6 toggles between 0/1 during operation, stops when complete). Both are usable at any time during programming and eliminate need for fixed tBP delays in host firmware.
Is AT49F002AT-55JI compatible with standard EPROM sockets and timing?
Yes, AT49F002AT-55JI uses identical CE/OE/WE control signaling and timing as industry-standard EPROMs, including 55 ns tACC and tCE. Its read interface requires no protocol translation, allowing drop-in replacement in existing EPROM-based designs with only minor firmware updates for programming sequences.
AT49F002AT-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)
AT49F002AT-55JI FAQ
1.How can I place an order for AT49F002AT-55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002AT-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 AT49F002AT-55JI reliable?
The price and inventory of AT49F002AT-55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002AT-55JI is usually 5 days.
3.What payment methods are accepted for AT49F002AT-55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002AT-55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002AT-55JI?
AT49F002AT-55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002AT-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 AT49F002AT-55JI?
For technical support, including AT49F002AT-55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002AT-55JI requirements.
6.How does Aetrix verify that AT49F002AT-55JI is sourced from the original manufacturer or authorized distributors?
All AT49F002AT-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 AT49F002AT-55JI meets industry standards.
7.What is the process for return or replacement of AT49F002AT-55JI?
All AT49F002AT-55JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002AT-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 AT49F002AT-55JI part is unused and in its original packaging.
Return procedure for AT49F002AT-55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F002AT-55JI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
