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Microchip Technology AT49F001AT-45JI
- Part No.:
- AT49F001AT-45JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001AT-45JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F001AT-45JI from Atmel is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory with 45 ns read access time, 3-second chip erase cycle, and sector-based architecture including a 16K-byte boot block with programmable lockout. It operates across the industrial temperature range (−40°C to +85°C) and supports byte-by-byte programming at 30 µs/byte for embedded firmware storage in microcontroller-based systems.
For engineers reviewing the AT49F001AT-45JI datasheet, AT49F001AT-45JI pinout, AT49F001AT-45JI application, or AT49F001AT-45JI equivalent, this device serves as a drop-in replacement for legacy EPROMs in boot code storage, parameter retention, and field-upgradable firmware applications requiring hardware data protection, DATA polling, and RESET-controlled boot block override.
Technical Context
The AT49F001AT-45JI implements a sector-organized Flash architecture with five distinct memory regions: one 16K-byte boot block (address range 1C000H–1FFFFH), two 8K-byte parameter blocks (1A000H–1BFFFH and 18000H–19FFFH), and two main memory blocks (10000H–17FFFH and 00000H–0FFFFH). Its command-set-driven operation uses standard CE/OE/WE control lines and supports software-controlled chip erase, sector erase, and byte programming without high-voltage programming inputs.
Hardware data protection includes VCC sense (<3.8 V inhibits programming), noise filtering on WE/CE (rejects <15 ns pulses), and active inhibit via OE low/CE high/WE high states. The RESET pin enables system-level reset and - when driven to 12 V ± 0.5 V - overrides boot block lockout, a feature absent in AN(T) variants but fully supported in AT49F001AT-45JI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - directly replaces 27C010 EPROMs in 8-bit bus systems. |
| Read Access Time | 45 ns max - enables direct interface with 20 MHz microcontrollers without wait states. |
| Erase Cycle Time | 3 seconds typical for full chip erase - supports rapid firmware updates during production or field service. |
| Byte Programming Time | 30 µs typical - allows fine-grained patching of configuration data or runtime parameters. |
| Supply Current | 20 mA active / 50 µA CMOS standby - suitable for low-power industrial controllers with battery backup. |
| Operating Voltage | 5.0 V ±10% - eliminates need for dedicated programming voltage regulators in host systems. |
| Temperature Range | −40°C to +85°C - qualified for industrial automation, automotive body control, and telecom infrastructure. |
Pinout & Package
AT49F001AT-45JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 compliant, with 1.27 mm pitch and pin 1 identifier marked by corner notch. The package measures 12.32 mm × 14.86 mm × 3.35 mm (max height) and is lead-free compatible per RoHS requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A11–A16 are don't-care in some command cycles. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; controls bus contention avoidance. |
| OE | Output Enable | Active-low output gate; high impedance when asserted high, enabling shared data bus operation. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence timing. |
| RESET | Reset Input | Active-low system reset; 12 V input enables boot block reprogramming override - unique to AT(T) variant. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; supports DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) for program/erase status detection. |
| VCC | Power Supply | +5 V ±10% supply; internal VCC sense circuitry disables programming if voltage drops below 3.8 V. |
| GND | Ground Reference | Signal and power ground reference; decoupling capacitor required within 10 mm of VCC pin. |
| NC | No Connect | Pin 1 in PLCC package is unconnected - must remain floating per datasheet note. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16K-byte boot block (1C000H–1FFFFH) can be permanently write-protected via command sequence to prevent accidental corruption of bootloader code. |
| Hardware-Based Data Protection | VCC sensing, noise filtering, and control-line inhibit prevent spurious writes during power transients or EMI events. |
| Two Status Detection Methods | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) allow real-time monitoring of program/erase completion without external timers. |
| 12 V RESET Override | Applying 12 V ± 0.5 V to RESET pin temporarily disables boot block lockout - critical for recovery after failed firmware update. |
| Standard Microprocessor Timing Compatibility | Command sequences use standard WE/CE pulse timing; no special bus controllers or glue logic required for integration. |
Applications
| Industrial PLC Firmware Storage | Automotive Body Control Module |
|---|---|
Use Scenario: Storing boot loader and safety-critical firmware in programmable logic controllers subject to frequent field updates and harsh electrical environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing immediate code execution on power-up and secure in-system reprogramming capability. Use Value: Boot block lockout prevents unauthorized modification of startup routines while allowing parameter and application code updates via sector erase. |
Use Scenario: Retaining calibration data, door module configurations, and lighting profiles in automotive body control units operating across extended temperature ranges. IC Role / Device Role / Timing Role: Parameter storage device interfaced to 8-bit MCU via standard parallel bus with deterministic 45 ns read latency. Use Value: 50 µA standby current extends battery life during vehicle sleep mode; hardware data protection ensures integrity during load dump events. |
| Telecom Line Card Configuration | Medical Diagnostic Equipment Boot Memory |
Use Scenario: Holding FPGA configuration bitstreams and protocol stack parameters in carrier-grade DSLAM line cards requiring hot-swap compatibility and long-term data retention. IC Role / Device Role / Timing Role: Field-upgradable flash memory supporting both chip and sector erase to minimize downtime during firmware patches. Use Value: 3-second chip erase enables rapid provisioning; DATA polling eliminates need for fixed delay timers in host firmware. |
Use Scenario: Securing FDA-compliant boot firmware and device-specific calibration constants in portable ultrasound and patient monitor systems. IC Role / Device Role / Timing Role: Certified nonvolatile memory storing immutable bootloader code and auditable revision history in tamper-resistant enclosure. Use Value: 10,000 write/erase cycles exceed IEC 62304 lifetime requirements; RESET-driven 12 V override supports authorized service-mode reflash. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002AT-45JI | 2 Mbit density (256K × 8), same 45 ns access, identical PLCC-32 package and command set. | Supports larger firmware images; requires no PCB change but needs updated address decoding for A17. | Select when future firmware growth exceeds 1 Mbit or dual-device redundancy is required. |
| MX29LV001CTTI-45G | 1 Mbit, 45 ns, 3.0 V core (5 V tolerant I/O), different command set, TSOP-32 package. | Lowers system power consumption; incompatible pinout and timing margins require layout and firmware adaptation. | Choose for new designs targeting lower active current or where 3.3 V logic domains dominate. |
Compared with AT49F002AT-45JI, the AT49F001AT-45JI offers sufficient capacity for compact boot loaders with tighter BOM cost control; versus MX29LV001CTTI-45G, it delivers proven 5 V compatibility and identical command sequencing for legacy system upgrades without redesign.
Availability
AT49F001AT-45JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive body control modules, and telecom line card configuration requiring stable component supply and long-term lifecycle support.
Supply support for AT49F001AT-45JI 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 fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and security ICs for industrial, automotive, and consumer applications.
The AT49F001A(T) series was designed as a 5 V-only Flash memory family to replace UV-erasable EPROMs in embedded systems requiring in-circuit reprogrammability without high-voltage programming circuitry.
FAQ
What is the boot block address range for AT49F001AT-45JI?
The boot block in AT49F001AT-45JI occupies addresses 1C000H to 1FFFFH (16K bytes), distinct from the AT49F001A(N) variant which locates the boot block at 00000H–03FFFH. This relocation enables flexible memory mapping for systems requiring top-of-memory boot code placement. The AT49F001AT-45JI supports boot block lockout activation via six-command sequence, and its lockout status can be verified by reading address 1C002H.
Does AT49F001AT-45JI support 12 V RESET override for boot block reprogramming?
Yes, AT49F001AT-45JI supports 12 V ± 0.5 V applied to the RESET pin to temporarily disable boot block lockout, enabling chip erase, sector erase, or byte programming of the protected region. This feature is explicitly documented for AT49F001A(N)T variants and is not available on AN(T) versions. After returning RESET to TTL levels, lockout re-engages automatically.
What packaging and lead finish does AT49F001AT-45JI use?
AT49F001AT-45JI is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package (JEDEC MS-016, Variation AE), with dimensions 12.32 mm × 14.86 mm × 3.35 mm max. It features matte tin lead finish compliant with RoHS Directive 2011/65/EU and IPC/JEDEC J-STD-020 moisture sensitivity level 3.
How does DATA polling work on AT49F001AT-45JI during byte programming?
During byte programming, reading the just-loaded address returns the complement of the programmed data on I/O7 until completion; once programming finishes, true data appears on all I/O lines. This allows host firmware to poll I/O7 without fixed delays. The AT49F001AT-45JI supports this feature across all operating modes and requires no additional control signals beyond standard CE/OE/WE sequencing.
Is AT49F001AT-45JI pin-compatible with AT49F001A-45JI?
No - AT49F001AT-45JI and AT49F001A-45JI share the same PLCC-32 package and pinout, but differ in boot block location (1C000H–1FFFFH vs. 00000H–03FFFH) and RESET functionality (12 V override enabled only in AT variant). Firmware must be adapted to match the relocated boot sector and leverage RESET override if needed. Hardware layout is identical.
AT49F001AT-45JI 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:
- 1Mbit
- Memory Organization:
- 128K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 45 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)
AT49F001AT-45JI FAQ
1.How can I place an order for AT49F001AT-45JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001AT-45JI 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 AT49F001AT-45JI reliable?
The price and inventory of AT49F001AT-45JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001AT-45JI is usually 5 days.
3.What payment methods are accepted for AT49F001AT-45JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001AT-45JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001AT-45JI?
AT49F001AT-45JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001AT-45JI 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 AT49F001AT-45JI?
For technical support, including AT49F001AT-45JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001AT-45JI requirements.
6.How does Aetrix verify that AT49F001AT-45JI is sourced from the original manufacturer or authorized distributors?
All AT49F001AT-45JI 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 AT49F001AT-45JI meets industry standards.
7.What is the process for return or replacement of AT49F001AT-45JI?
All AT49F001AT-45JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001AT-45JI, 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 AT49F001AT-45JI part is unused and in its original packaging.
Return procedure for AT49F001AT-45JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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