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Microchip Technology AT49F001NT-55JC
- Part No.:
- AT49F001NT-55JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001NT-55JC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,006
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Product details
Overview
AT49F001NT-55JC 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 controllers and boot loaders. It features 55 ns read access time, 10 µs typical byte programming, 10-second chip erase, hardware data protection, and sector architecture with 16K-byte boot block, two 8K-byte parameter blocks, and two main memory blocks (32K/64K bytes).
For engineers reviewing the AT49F001NT-55JC datasheet, AT49F001NT-55JC pinout, AT49F001NT-55JC application, or AT49F001NT-55JC equivalent, key selection criteria include 5V-only operation without high-voltage programming, boot block lockout capability, DATA polling and toggle bit for program/erase status detection, and PLCC-32 packaging for through-hole mounting in industrial control and legacy system upgrades.
Technical Context
The AT49F001NT-55JC implements a command-based Flash architecture requiring six-byte sequences for chip/sector erase and boot lockout enablement. Its internal program control logic manages timing, eliminating external clocks during erase cycles. The device supports standard EPROM-like read interface (CE/OE/WE) and uses address latching on falling WE or CE edges with data latched on rising edges.
It features dual-level hardware protection: VCC sense inhibits programming below 3.8 V, and noise filtering rejects sub-15 ns pulses on WE/CE. The RESET pin enables boot block override at 12 V (not available on AT49F001N(T)), while software product identification (Manufacturer Code 1FH, Device Code 04H) confirms identity via I/O0–I/O7 reads at specific addresses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - directly maps to 16-bit microcontroller data buses with no width conversion. |
| Read Access Time | 55 ns max - enables direct connection to 12 MHz Z80 or 8051 derivatives without wait states. |
| Byte Programming Time | 10 µs typical - allows rapid field updates of configuration parameters or firmware patches without system interruption. |
| Chip Erase Time | 10 seconds max - supports full reprogramming in under 15 seconds including setup and verification. |
| Endurance | 10,000 write/erase cycles - sufficient for >5 years of daily firmware updates in industrial logging applications. |
| Power Dissipation | 275 mW active (50 mA @ 5.5 V), 100 µA CMOS standby - compatible with low-power battery-backed systems. |
| Operating Voltage | 5 V ± 10% - eliminates need for dedicated programming voltage regulators in 5V system designs. |
Pinout & Package
AT49F001NT-55JC is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016 Variation AE, with dimensions 12.57 mm × 15.11 mm × 3.56 mm (max height), gull-wing J-leads, and pin 1 identifier notch. Pin 1 is NC (no connect) for DIP/PLCC packages per datasheet Note on page 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A16 required for accessing upper 64K block in AT49F001NT variant. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with 8086/8051/Z80 data buses; supports byte-wide programming and read operations. |
| CE | Chip Enable | Active-low chip select; when high, places outputs in high-impedance state to prevent bus contention during multi-device sharing. |
| OE | Output Enable | Active-low output control; used with CE to implement dual-line read gating for flexible timing margin management. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence timing requirements. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; 12 V input enables boot block override (functional on AT49F001NT). |
| VCC / GND | Power Supply | 5 V ± 10% supply and ground; decoupling capacitor placement near pins critical for stable erase/program operation. |
| NC | No Connect | Pin 1 is NC in PLCC package - must remain unconnected per datasheet specification to avoid functional disruption. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | Enables permanent protection of 16K-byte boot code (address 1C000H–1FFFFH) while allowing field updates to parameter and main memory blocks. |
| DATA Polling & Toggle Bit | Hardware status feedback via I/O7 complement (polling) or I/O6 toggling eliminates need for fixed delay loops during programming/erasing. |
| 5V-Only Reprogramming | Eliminates requirement for +12 V or +21 V programming supplies, simplifying power design and enabling in-circuit updates via standard 5V logic levels. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibit logic prevent accidental writes during power-up/down or EMI events. |
| Software Product Identification | Manufacturer Code 1FH and Device Code 04H readable via command sequence - enables automatic algorithm selection in universal programmers. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot Loader |
|---|---|
Use Scenario: Storing firmware images and configuration tables 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 IC providing fast 55 ns read access for real-time instruction fetch and secure 16K boot block for bootloader integrity. Use Value: Boot block lockout prevents corruption of startup code during field firmware updates, ensuring deterministic system recovery after power loss. | Use Scenario: Replacing obsolete EPROMs in aging medical devices and test equipment where board space and socket compatibility are constrained. IC Role / Device Role / Timing Role: Drop-in Flash memory replacement for 27C010/27C512 sockets using identical PLCC-32 footprint and 5V-only operation. Use Value: Eliminates UV eraser dependency and enables in-system reprogramming without removing the device from the PCB. |
| Automotive Diagnostic Module Memory | Telecom Equipment Parameter Storage |
Use Scenario: Storing calibration data and diagnostic routines in OBD-II modules subjected to automotive temperature ranges (-40°C to +85°C). IC Role / Device Role / Timing Role: Industrial-grade Flash memory with 50 mA active current and 300 µA standby current meeting automotive power budget constraints. Use Value: Sector erase capability allows independent updating of calibration tables without disturbing diagnostic code stored in protected boot block. | Use Scenario: Holding configuration profiles and protocol stacks in DSLAM line cards requiring reliable nonvolatile storage across multiple firmware revisions. IC Role / Device Role / Timing Role: Dual-parameter-block architecture (8K × 2) provides redundant storage for fail-safe parameter backup and version rollback. Use Value: Byte-by-byte programming enables granular updates of individual configuration registers without full memory rewrites. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF010-55-4C-NHE | 55 ns access, 1 Mbit, 3.3 V core (5 V tolerant I/O), 10K endurance, PLCC-32 package | Requires level-shifting for pure 5V systems; lower active current (30 mA) but higher standby (1 µA) | Select for mixed-voltage systems or where lower power consumption is prioritized over strict 5V compatibility. |
| MX29LV160CBTI-55G | 55 ns access, 16 Mbit density, 3 V operation, TSOP-48 package, CFI-compliant command set | Higher density and different command protocol; incompatible pinout and voltage - not drop-in | Choose for new designs needing larger capacity and industry-standard CFI interface, not for AT49F001NT-55JC replacement. |
Compared with SST39VF010-55-4C-NHE and MX29LV160CBTI-55G, the AT49F001NT-55JC delivers true 5V-only operation with boot block lockout and PLCC-32 compatibility, making it uniquely suitable for legacy 5V embedded upgrades where voltage translation or PCB redesign is prohibited.
Availability
AT49F001NT-55JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot loader replacement, automotive diagnostic module memory, and telecom equipment parameter storage requiring stable component supply across extended lifecycle programs.
Supply support for AT49F001NT-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 the AT49F series Flash memories, providing long-term product availability and technical documentation.
The AT49F001NT-55JC belongs to Atmel's legacy 5V Flash memory product line, designed specifically for cost-sensitive, pin-compatible replacements of EPROMs in industrial and automotive control systems requiring in-system reprogrammability without high-voltage circuitry.
FAQ
What is the boot block address range for AT49F001NT-55JC?
The boot block address range for AT49F001NT-55JC is 1C000H to 1FFFFH (16 Kbytes), as confirmed in the datasheet section "Notes" on page 6 and "Boot Block Programming Lockout" on page 4. This differs from the base AT49F001(N) variant, which uses 00000H–03FFFH, and is specific to the AT49F001NT family.
Does AT49F001NT-55JC support 12 V RESET override for boot block reprogramming?
Yes, AT49F001NT-55JC supports 12 V ± 0.5 V applied to the RESET pin to override boot block lockout and enable chip/sector erase or byte programming of the protected region. This feature is explicitly documented in the "Boot Block Programming Lockout Override" section (page 5) and applies to the AT49F001NT variant.
What is the maximum erase cycle time for AT49F001NT-55JC?
The maximum erase cycle time for AT49F001NT-55JC is 10 seconds for full chip erase, as specified in the "Features" section (page 1) and "Program Cycle Characteristics" table (page 11). Sector erase times are not individually specified but fall within the same 10-second maximum bound per datasheet characterization.
How does DATA polling work on AT49F001NT-55JC?
During byte programming, reading the last loaded address returns the complement of the programmed data on I/O7 until completion; once valid data appears on I/O7, the program cycle has finished. This behavior is defined in the "DATA POLLING" section (page 5) and verified in the "Data Polling Waveforms" (page 12) of the AT49F001NT-55JC datasheet.
Is pin 1 of AT49F001NT-55JC connected or unused?
Pin 1 of AT49F001NT-55JC is NC (No Connect) in the PLCC package, as stated in the "Pin Configurations" section (page 2) and reinforced in the "Ordering Information" notes (page 17). It must remain unconnected in PCB layout to ensure correct device operation.
AT49F001NT-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)
AT49F001NT-55JC FAQ
1.How can I place an order for AT49F001NT-55JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001NT-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 AT49F001NT-55JC reliable?
The price and inventory of AT49F001NT-55JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001NT-55JC is usually 5 days.
3.What payment methods are accepted for AT49F001NT-55JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001NT-55JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001NT-55JC?
AT49F001NT-55JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001NT-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 AT49F001NT-55JC?
For technical support, including AT49F001NT-55JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001NT-55JC requirements.
6.How does Aetrix verify that AT49F001NT-55JC is sourced from the original manufacturer or authorized distributors?
All AT49F001NT-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 AT49F001NT-55JC meets industry standards.
7.What is the process for return or replacement of AT49F001NT-55JC?
All AT49F001NT-55JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001NT-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 AT49F001NT-55JC part is unused and in its original packaging.
Return procedure for AT49F001NT-55JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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