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Microchip Technology AT49F001N-55JC
- Part No.:
- AT49F001N-55JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001N-55JC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,974
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Product details
Overview
AT49F001N-55JC from Microchip Technology (formerly Atmel) is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory IC with 55 ns read access time, sector-based architecture (16K boot block + two 8K parameter blocks + two main memory blocks), and hardware data protection. It serves as nonvolatile program/data storage in embedded microcontroller systems requiring field-upgradable firmware.
For engineers reviewing the AT49F001N-55JC datasheet, AT49F001N-55JC pinout, AT49F001N-55JC application, or AT49F001N-55JC equivalent, key selection considerations include its 55 ns commercial-grade timing, PLCC-32 package, boot block programming lockout feature, 10 µs/byte typical programming time, and compatibility with standard EPROM-like bus interface (CE/OE/WE).
Technical Context
The AT49F001N-55JC implements a command-register-based architecture for erase and program operations, using six-byte software command sequences (e.g., 5555h/2AAAh/80h/5555h/2AAAh/40h to enable boot block lockout). Its sector erase capability supports independent erasure of parameter blocks (8K each) and main memory blocks (32K and 64K), with chip erase excluding the locked boot block.
It features dual end-of-operation detection: DATA polling (I/O7 complement during programming) and Toggle Bit (I/O6 toggling during program/erase cycles). Hardware protection includes VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibition (OE low, CE high, or WE high blocks writes).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - supports full firmware image storage for 8-bit microcontrollers. |
| Read Access Time | 55 ns max - enables direct execution from flash (XIP) in systems with ≤18 MHz bus clocks. |
| Programming Time | 10 µs/byte typical - allows rapid field updates of small configuration or calibration data segments. |
| Erase Cycle Time | 10 seconds max for full chip - defines minimum firmware update latency when reprogramming large sections. |
| Endurance | 10,000 write/erase cycles - ensures reliability over multiple field upgrades in industrial control applications. |
| Power Dissipation | 275 mW active (50 mA @ 5 V), 100 µA CMOS standby - suitable for low-power embedded systems with duty-cycled operation. |
| Operating Voltage | 5 V ±10% - eliminates need for external voltage translators in legacy 5 V logic systems. |
| Temperature Range | 0°C to +70°C (Commercial) - validated for use in office equipment, consumer electronics, and non-critical industrial interfaces. |
Pinout & Package
AT49F001N-55JC is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE, with lead pitch of 1.27 mm and body dimensions 12.57 mm × 15.11 mm × 3.56 mm (max height). Pin 1 identifier is a corner chamfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A0–A16 map directly to memory locations 00000h–1FFFFh. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path for read, byte-program, and command input; compatible with standard microprocessor data buses. |
| 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; used with CE to prevent bus contention during reads; high-Z when inactive. |
| WE | Write Enable | Active-low write strobe; latches address and data during programming/erase command sequences; inhibits writes if held high. |
| RESET | Reset Input | Active-low reset; forces outputs to high-Z and halts ongoing operations; not used for boot block override (unavailable on N variant). |
| VCC | Power Supply | +5 V ±10% supply; powers all internal logic and charge pumps; requires local 0.1 µF decoupling. |
| GND | Ground Reference | Signal and power ground reference; must be low-impedance connection to minimize noise coupling during programming. |
| NC | No Connect | Pin 1 on PLCC package is NC - must remain unconnected per datasheet; floating or tied to GND/VCC violates specification. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16K-byte boot block (00000h–03FFFh) can be permanently write-protected via command sequence, securing bootloader code against accidental overwrite. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibit prevent spurious writes during power transients or EMI events without software overhead. |
| DATA Polling & Toggle Bit | Two independent, hardware-based methods (I/O7 complement and I/O6 toggle) allow host processor to detect completion without fixed delays or external timers. |
| 5V-Only Reprogramming | Eliminates need for 12 V programming supplies or external high-voltage generators - simplifies system power design and reduces BOM cost. |
| Standard EPROM-Compatible Interface | Uses CE/OE/WE control signals identical to EPROMs, enabling drop-in replacement in existing designs with no logic changes required. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Backup |
|---|---|
Use Scenario: Storing field-upgradable ladder logic and I/O configuration in programmable logic controllers operating in factory environments. IC Role / Device Role / Timing Role: Nonvolatile program memory holding firmware images; 55 ns access supports real-time scan cycle execution. Use Value: Sector erase enables updating only modified function blocks without reprogramming entire controller image, reducing downtime during maintenance. | Use Scenario: Providing secondary BIOS storage in desktop motherboards for recovery after corrupted primary flash updates. IC Role / Device Role / Timing Role: Standby-resident backup memory accessed only during recovery; CMOS standby current <100 µA minimizes power drain. Use Value: Boot block lockout prevents accidental corruption of recovery code, ensuring guaranteed system restore capability. |
| Point-of-Sale Terminal Configuration | Medical Device Calibration Data |
Use Scenario: Storing localized tax tables, language packs, and peripheral driver settings in retail terminals deployed globally. IC Role / Device Role / Timing Role: Parameter memory partitioned into two 8K blocks - one for region-specific data, one for device-specific settings. Use Value: Independent sector erase allows updating tax tables without affecting language or driver configurations, improving update reliability. | Use Scenario: Retaining factory-calibrated sensor offsets and gain coefficients in portable diagnostic equipment subject to regulatory audit. IC Role / Device Role / Timing Role: Secure nonvolatile storage with write-protection; 10,000-cycle endurance exceeds expected service life. Use Value: Hardware lockout ensures calibration data integrity across device lifetime, satisfying FDA 21 CFR Part 11 traceability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV001MT-55EC | 3 V core with 5 V I/O tolerance; 55 ns access; 1 Mbit; different command set and sector map (single 16K boot sector). | Requires level-shifting in pure 5 V systems; lacks RESET-based boot override; uses AMD-style command sequences. | Select for lower power or mixed-voltage designs where 3 V operation is preferred and command firmware can be adapted. |
| MX29LV001CTTI-55G | 3 V supply; 55 ns access; 1 Mbit; top-boot sector; supports CFI query; different timing parameters (tWH = 30 ns vs. 90 ns). | Not 5 V compatible; requires redesign of power delivery and interface timing; CFI support eases auto-detection in generic programmers. | Select when migrating to modern 3 V platforms or when CFI compliance is required for standardized flash management software. |
Compared with AM29LV001MT-55EC and MX29LV001CTTI-55G, the AT49F001N-55JC provides native 5 V operation, simpler command sequencing, and proven compatibility with legacy EPROM-based systems - making it optimal for cost-sensitive, 5 V-only industrial upgrades where minimal firmware changes are critical.
Availability
AT49F001N-55JC is available at Aetrix Electronics and suitable for industrial control systems, legacy PC platform recovery modules, point-of-sale terminal firmware storage, and medical device calibration data retention requiring stable component supply over extended production lifecycles.
Supply support for AT49F001N-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
Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel Flash products including the AT49F001 family.
The AT49F001 series was designed specifically for in-system reprogrammable firmware and configuration storage in 5 V microcontroller-based systems, emphasizing ease of integration, sector-level flexibility, and robust hardware write protection.
FAQ
What is the memory organization of the AT49F001N-55JC?
The AT49F001N-55JC contains 1 Mbit (131,072 × 8) of Flash memory, organized as 128K words × 8 bits. Its physical address space spans 00000h to 1FFFFh, divided into a 16K-byte boot block (00000h–03FFFh), two 8K-byte parameter blocks, and two main memory blocks (32K and 64K bytes). This layout is fixed and documented in the AT49F001N-55JC datasheet.
Does the AT49F001N-55JC support boot block programming lockout?
Yes, the AT49F001N-55JC supports boot block programming lockout via a six-byte command sequence (5555h/2AAAh/80h/5555h/2AAAh/40h). Once enabled, the 16K-byte boot block (00000h–03FFFh) becomes permanently write-protected under 5.5 V operation. This feature is confirmed in the AT49F001N-55JC datasheet Section 4 and cannot be reversed without external high-voltage override (not supported on the N variant).
What package type is used for the AT49F001N-55JC?
The AT49F001N-55JC uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, designated as 32J per Atmel's ordering information. Its mechanical dimensions conform to JEDEC MS-016, Variation AE, with a 1.27 mm lead pitch and body size of 12.57 mm × 15.11 mm. Pin 1 is identified by a corner chamfer, and pin 1 is NC (no connect).
How does the AT49F001N-55JC detect end-of-program operations?
The AT49F001N-55JC provides two hardware 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 upon completion). Both are fully functional in the AT49F001N-55JC and require no external components - details are specified in Sections 5 and 12 of the AT49F001N-55JC datasheet.
Is the RESET pin on the AT49F001N-55JC usable for boot block override?
No, the RESET pin on the AT49F001N-55JC is not usable for boot block override. The datasheet explicitly states "The RESET feature is not available for the AT49F001N(T)" and "This feature is not available on the AT49F001N(T)". Therefore, once boot block lockout is enabled on the AT49F001N-55JC, it cannot be disabled - unlike the T variant which supports 12 V override on RESET.
AT49F001N-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:
- 1Mbit
- Memory Organization:
- 128K 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)
AT49F001N-55JC FAQ
1.How can I place an order for AT49F001N-55JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001N-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 AT49F001N-55JC reliable?
The price and inventory of AT49F001N-55JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001N-55JC is usually 5 days.
3.What payment methods are accepted for AT49F001N-55JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001N-55JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001N-55JC?
AT49F001N-55JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001N-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 AT49F001N-55JC?
For technical support, including AT49F001N-55JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001N-55JC requirements.
6.How does Aetrix verify that AT49F001N-55JC is sourced from the original manufacturer or authorized distributors?
All AT49F001N-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 AT49F001N-55JC meets industry standards.
7.What is the process for return or replacement of AT49F001N-55JC?
All AT49F001N-55JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001N-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 AT49F001N-55JC part is unused and in its original packaging.
Return procedure for AT49F001N-55JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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