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Microchip Technology AT49F001-90JC
- Part No.:
- AT49F001-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001-90JC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,093
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Product details
Overview
AT49F001-90JC from Microchip Technology (formerly Atmel) is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It features 55 ns read access time, 10 µs/byte typical programming, 10-second chip erase, hardware data protection, and sector-based architecture with 16 KB boot block, two 8 KB parameter blocks, and two main memory blocks (32 KB + 64 KB).
For engineers reviewing the AT49F001-90JC datasheet, AT49F001-90JC pinout, AT49F001-90JC application, or AT49F001-90JC equivalent, key selection criteria include commercial-grade 55 ns read timing, PLCC-32 package compatibility, boot-block lockout capability, DATA polling/Toggle Bit program verification, and 5V-only command-set simplicity for legacy 8-bit bus interfaces.
Technical Context
The AT49F001-90JC implements a standard parallel Flash interface with CE/OE/WE control logic and supports EPROM-like read operation plus software-controlled byte programming and sector/chip erase. Its internal command register interprets six-cycle sequences (e.g., 5555h/AAh → 2AAAh/55h → 5555h/80h) to enable boot lockout, sector erase, or chip erase without external high-voltage circuitry.
It uses CMOS nonvolatile technology with VCC sense (inhibit below 3.8 V), noise filtering (<15 ns pulse rejection), and dual-line control (CE+OE) to prevent bus contention. The RESET pin enables system-level reset and - on non-N(T) variants - 12 V override of boot block lockout, though this feature is disabled in the AT49F001N(T) family including AT49F001-90JC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - directly replaces 27C010 EPROM in 8-bit microcontroller address/data buses. |
| Read Access Time | 90 ns max (tACC) - ensures compatibility with 11 MHz Z80, 8051, and 68K-based systems requiring ≤100 ns memory fetch. |
| Byte Programming Time | 10 µs typical (tBP) - enables rapid field updates of configuration or calibration data without interrupting real-time operation. |
| Erase Cycle Time | 10 seconds max (tEC) for full chip erase - supports in-system firmware recovery without socket removal or UV eraser. |
| 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 | 275 mW active (50 mA @ 5 V), 100 µA CMOS standby - suitable for low-power industrial controllers with battery backup. |
| Endurance | 10,000 write/erase cycles - validated for firmware update partitions in programmable logic controllers and HMI modules. |
Pinout & Package
AT49F001-90JC is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC-32) package per JEDEC MS-016, Variation AE, with pin 1 identifier at corner and J-leads on all four sides. Dimensions: 12.5 mm × 12.5 mm × 3.4 mm (max height), lead coplanarity ≤0.102 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus (00000h–1FFFFh); A0–A16 fully decoded for 128K-word addressing. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path; high-impedance when CE or OE high; supports byte-wide read/write. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access. |
| OE | Output Enable | Active-low output control; used with CE to manage bus contention in multi-device systems. |
| WE | Write Enable | Active-low write strobe; latches address/data during programming/erase command sequences. |
| RESET | Reset Input | Active-low system reset; halts ongoing operations and forces outputs to high-Z; no 12 V override (disabled in N(T) variant). |
| VCC | Power Supply | +5.0 V ±10% supply; internal VCC sense prevents programming if voltage drops below 3.8 V. |
| GND | Ground | Signal and power reference; decoupling capacitor required within 10 mm of VCC/GND pins. |
| NC | No Connect | Pin 32 (PLCC top view) is unconnected; must remain floating - not tied to VCC or GND. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | 1×16 KB boot block (00000h–03FFFh), 2×8 KB parameter blocks, 2×main blocks (32 KB + 64 KB) - enables independent firmware partitioning and secure bootloader storage. |
| Boot Block Lockout | Software-enabled permanent write protection for boot sector; once activated, prevents accidental overwrite of startup code under 5.5 V operation. |
| Hardware Data Protection | VCC sense, noise filtering, and CE/OE/WE interlock - eliminates spurious writes from EMI, brownouts, or glitchy control signals. |
| 5V-Only Command Set | No external 12 V or 21 V required; all reads, programs, and erases executed using standard 5 V logic levels - simplifies PCB design and reduces BOM count. |
| DATA Polling & Toggle Bit | Real-time program/erase status feedback via I/O7 complement or I/O6 toggle - removes need for fixed timeout loops in host firmware. |
Applications
| Industrial PLC Firmware Storage | Legacy 8-bit Microcontroller Bootloader |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile code storage with 90 ns read timing and sector-erase granularity to support modular firmware updates without full reflash. Use Value: Boot block lockout ensures bootloader integrity across 10,000+ field updates; 100 µA standby current extends battery-backed RAM retention during power loss. |
Use Scenario: Hosting boot code and initialization routines for Z80, 8051, or 68000-based embedded systems where space-constrained PCBs require PLCC-packaged Flash. IC Role / Device Role / Timing Role: Direct replacement for 27C010 EPROM in 8-bit address/data bus configurations; supports same pinout and timing envelope. Use Value: 5V-only operation eliminates high-voltage generator circuitry; DATA polling enables deterministic boot sequence timing in safety-critical applications. |
| Medical Device Calibration Data | Telecom Line Card Configuration |
Use Scenario: Retaining calibrated sensor offsets and gain coefficients in portable diagnostic equipment subject to regulatory traceability requirements. IC Role / Device Role / Timing Role: Secure, long-term parameter storage with write-protection enforced by boot lockout algorithm and hardware VCC sensing. Use Value: Sector erase allows selective reprogramming of calibration tables without disturbing certified boot firmware; 10,000-cycle endurance exceeds 15-year device lifetime. |
Use Scenario: Storing line interface configuration profiles (e.g., DSLAM, T1/E1 framing) in telecom infrastructure cards requiring field-upgradable settings. IC Role / Device Role / Timing Role: In-system reprogrammable memory accessed via parallel bus; supports hot-swap-safe firmware patching via sector erase. Use Value: Parameter block architecture isolates configuration data from main firmware; Toggle Bit detection enables robust status monitoring over noisy backplane buses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF010-90-4C-NHE | 4 Mbit density (512K × 8), 90 ns read, 3.3 V core (5 V tolerant I/O), TSOP-32 package | Higher density and lower voltage operation; lacks boot block lockout and RESET pin functionality | Select when migrating to 3.3 V systems or requiring >1 Mbit capacity; requires level-shifting or redesign for 5 V-only buses. |
| MX29LV010TC-90G | 1 Mbit, 90 ns read, 3 V operation (no 5 V tolerance), PLCC-32, includes CFI query support | Lower power (30 mA active), but incompatible with 5 V logic; no hardware RESET or boot lockout override | Choose for new 3 V designs prioritizing low power; not drop-in compatible with AT49F001-90JC due to supply voltage mismatch. |
Compared with SST39VF010-90-4C-NHE and MX29LV010TC-90G, the AT49F001-90JC uniquely delivers 5V-only operation with boot block lockout and RESET-driven system reset - critical for legacy industrial controllers where voltage migration or firmware security cannot be compromised.
Availability
AT49F001-90JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy 8-bit microcontroller bootloader implementation, and medical device calibration data retention requiring stable component supply across extended product lifecycles.
Supply support for AT49F001-90JC 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 full support for legacy Atmel Flash products including the AT49F001 series. The company specializes in microcontrollers, analog, and memory solutions for industrial, automotive, and consumer markets.
The AT49F001 product line was designed for cost-sensitive, 5V-based embedded systems requiring reliable in-system reprogrammability without high-voltage programming circuitry - targeting industrial control, instrumentation, and legacy computing platforms.
FAQ
What is the maximum read access time specified for the AT49F001-90JC?
The AT49F001-90JC has a maximum address-to-output delay (tACC) of 90 ns over the commercial temperature range (0°C to +70°C). This value is guaranteed and tested per AC Read Characteristics table in the datasheet, ensuring compatibility with microcontrollers and FPGAs requiring ≤100 ns memory access timing.
Does the AT49F001-90JC support boot block protection, and how is it enabled?
Yes, the AT49F001-90JC supports boot block programming lockout for its 16 KB boot sector (address range 00000h–03FFFh). It is enabled via a six-cycle software command sequence: load AAh to 5555h, 55h to 2AAAh, 80h to 5555h, then AAh/55h/40h to 5555h/2AAAh/5555h. Once activated, the boot block cannot be erased or programmed at ≤5.5 V.
What package type is used for the AT49F001-90JC, and what are its key mechanical dimensions?
The AT49F001-90JC uses a 32-lead Plastic Leaded Chip Carrier (PLCC-32) package per JEDEC MS-016, Variation AE. Key dimensions: 12.5 mm × 12.5 mm body size, 3.4 mm maximum height, 1.27 mm lead pitch, and pin 1 identifier located at the top-left corner with a 45° chamfer.
Can the AT49F001-90JC be used as a direct replacement for the AT29C010 or 27C010 EPROM?
The AT49F001-90JC is pin-compatible and functionally equivalent to the 27C010 EPROM in read mode and shares the same 32-pin PLCC footprint. However, it differs in write/erase methodology: unlike UV-erasable EPROMs, the AT49F001-90JC uses software commands and requires no UV eraser - making it a functional upgrade, not a drop-in replacement without firmware adaptation.
What methods does the AT49F001-90JC provide to detect completion of a byte programming cycle?
The AT49F001-90JC provides two hardware-supported methods: DATA polling (reading the programmed byte returns its complement on I/O7 until completion) and Toggle Bit (I/O6 toggles between 0 and 1 during programming and stops when complete). Both allow host firmware to avoid fixed delays and respond dynamically to actual device state.
AT49F001-90JC 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:
- 90 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)
AT49F001-90JC FAQ
1.How can I place an order for AT49F001-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001-90JC 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 AT49F001-90JC reliable?
The price and inventory of AT49F001-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001-90JC is usually 5 days.
3.What payment methods are accepted for AT49F001-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001-90JC?
AT49F001-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001-90JC 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 AT49F001-90JC?
For technical support, including AT49F001-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001-90JC requirements.
6.How does Aetrix verify that AT49F001-90JC is sourced from the original manufacturer or authorized distributors?
All AT49F001-90JC 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 AT49F001-90JC meets industry standards.
7.What is the process for return or replacement of AT49F001-90JC?
All AT49F001-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001-90JC, 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 AT49F001-90JC part is unused and in its original packaging.
Return procedure for AT49F001-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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