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Microchip Technology AT49F001NT-90VC
- Part No.:
- AT49F001NT-90VC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49F001NT-90VC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,450
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Product details
Overview
AT49F001NT-90VC from Microchip Technology (formerly Atmel) is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory IC with 90 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 AT49F001NT-90VC datasheet, AT49F001NT-90VC pinout, AT49F001NT-90VC application, or AT49F001NT-90VC equivalent, key selection criteria include 5V-only operation, boot block lockout capability, 10 µs/byte typical programming time, 10-second erase cycle, and compatibility with standard EPROM-like bus interfaces (CE/OE/WE control).
Technical Context
The AT49F001NT-90VC implements a command-register-based architecture for byte programming, sector erasure, and chip erasure using six-byte software sequences. Its internal logic supports DATA polling (I/O7 complement) and toggle-bit detection (I/O6) to monitor program/erase completion without external timing constraints.
It features dual-mode reset handling: TTL-level RESET enables standard operation halt and high-impedance output state, while 12V on RESET overrides boot block lockout-though this override is disabled in the NT variant per datasheet Note * on page 2 and "RESET feature is not available for the AT49F001N(T)" on page 3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - provides sufficient space for boot code and parameter storage in resource-constrained embedded hosts. |
| Read Access Time | 90 ns max - meets timing requirements for 11 MHz bus interfaces without wait states in commercial-temperature systems. |
| Programming Time | 10 µs/byte typical - enables rapid field updates of small firmware patches or configuration data. |
| Erase Cycle Time | 10 seconds max for full chip or sector - allows predictable maintenance windows during system reprogramming. |
| Endurance | 10,000 write/erase cycles - supports long-term deployment in industrial controllers with periodic firmware revisions. |
| Power Dissipation | 50 mA active current, 100 µA CMOS standby current - suitable for low-power embedded applications with sleep/wake duty cycles. |
| Operating Voltage | 5.0 V ±10% - eliminates need for auxiliary voltage rails; compatible with legacy 5V microcontroller buses. |
Pinout & Package
AT49F001NT-90VC is supplied in a 32-lead Plastic Thin Small Outline Package (VSOP), 8 mm × 14 mm body size (package code 32V), JEDEC-compliant with gull-wing leads and pin 1 identifier notch.
| 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 0x00000–0x1FFFF. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; enables bus contention avoidance in multi-device systems. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high, allowing shared data bus operation. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence; inhibits programming if held high. |
| I/O0–I/O7 | Data Input/Output | Bi-directional 8-bit data bus; carries command codes, program data, and read outputs; supports DATA polling on I/O7 and toggle-bit monitoring on I/O6. |
| RESET | Reset Input | Active-low signal halting ongoing operations and forcing high-Z outputs; TTL-level only (no 12V override in NT variant). |
| VCC | Power Supply | +5V ±10% supply input; powers core logic and I/O buffers; requires local 0.1 µF decoupling per datasheet layout guidance. |
| GND | Ground | Reference return path for VCC and all signals; must be low-inductance connection to minimize noise coupling during programming. |
| NC | No Connect | Pin 9 in VSOP package is unconnected - must remain floating per datasheet Note on page 2 and ordering table footnote. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16K-byte boot block (address 0x1C000–0x1FFFF) supports permanent firmware lockdown via command sequence - prevents accidental corruption of bootloader code during field updates. |
| Hardware Data Protection | VCC sense (<3.8V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibition (OE low/CE high/WE high blocks writes) - ensures robustness against power glitches and EMI. |
| DATA Polling & Toggle Bit | I/O7 complement indicates programming progress; I/O6 toggling signals erase/program status - eliminates need for fixed delay timers in host firmware. |
| 5V-Only Reprogrammability | No external high-voltage programming supply required - simplifies system design and reduces BOM count versus EPROM or older Flash devices. |
| Standard EPROM-Compatible Interface | Uses CE/OE/WE control lines with identical timing to industry-standard EPROMs - enables drop-in replacement in existing 5V microcontroller designs. |
Applications
| Industrial PLC Firmware Storage | Automotive Instrument Cluster Code |
|---|---|
|
Use Scenario: Storing boot loader and calibration tables in programmable logic controllers operating in harsh factory environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile program memory providing deterministic 90 ns read access and 10-second sector erase for firmware patching during maintenance windows. Use Value: Boot block lockout ensures bootloader integrity across 10,000+ field updates; 100 µA standby current extends battery-backed runtime during power loss events. |
Use Scenario: Holding display driver firmware and vehicle-specific configuration data in automotive digital dashboards certified to AEC-Q100 Grade 3. IC Role / Device Role / Timing Role: In-system reprogrammable Flash memory interfacing directly with 8-bit MCU via standard parallel bus, supporting over-the-air update readiness. Use Value: 5V-only operation avoids level-shifting complexity; sector erase enables selective reprogramming of UI assets without disrupting core instrumentation code. |
| Medical Device Parameter Archiving | Networking Equipment Boot Image |
|
Use Scenario: Retaining device-specific calibration coefficients and usage logs in portable diagnostic equipment requiring FDA-compliant data retention. IC Role / Device Role / Timing Role: Secure, lockable nonvolatile memory with hardware write protection to prevent unauthorized modification of regulatory-critical parameters. Use Value: Boot block lockout and VCC-sense programming inhibit meet IEC 62304 safety requirements; 10,000-cycle endurance exceeds 10-year service life expectations. |
Use Scenario: Hosting primary boot image and fail-safe recovery firmware in enterprise switches and routers where firmware rollback must be atomic and reliable. IC Role / Device Role / Timing Role: Dual-sector Flash memory enabling A/B partitioning - one main block runs active firmware while the other stores verified updates. Use Value: Sector erase capability allows independent update of boot image without disturbing parameter blocks; DATA polling ensures precise timing control during flash-to-RAM load sequences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002NT-90VC | 2 Mbit (256K × 8) density, same 90 ns access, identical pinout and command set - direct upgrade path with doubled capacity. | Required when boot + application + parameter storage exceeds 128K bytes; no change to host interface logic or PCB layout. | Select AT49F002NT-90VC if future firmware growth mandates >128K code space; retains full software compatibility and lockout behavior. |
| SST39VF010-90-4C-NHE | 1 Mbit, 90 ns, 3.3V/5V tolerant (VCC = 2.7–3.6V or 4.5–5.5V), different command set (SST proprietary), no RESET pin. | Used in mixed-voltage systems where 3.3V core logic coexists with 5V peripherals; lacks boot block lockout and 12V override capability. | Choose SST39VF010-90-4C-NHE only if system operates at 3.3V or requires lower active power; verify command sequence migration effort in firmware. |
Compared with AT49F001NT-90VC, AT49F002NT-90VC offers scalable capacity within identical timing and security constraints, while SST39VF010-90-4C-NHE trades boot block protection and 5V simplicity for 3.3V compatibility and reduced power - making it suitable only when voltage domain bridging is mandatory.
Availability
AT49F001NT-90VC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive instrument cluster code, and medical device parameter archiving requiring stable component supply across extended product lifecycles.
Supply support for AT49F001NT-90VC 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 memory portfolio, delivering high-reliability nonvolatile storage solutions for industrial and automotive markets.
The AT49F001NT-90VC belongs to Atmel's legacy parallel-interface Flash memory product line, designed specifically for 5V microcontroller systems needing in-system reprogrammability, sector-level erase granularity, and hardware-based data integrity protection.
FAQ
What is the boot block address range for AT49F001NT-90VC?
The boot block for AT49F001NT-90VC occupies addresses 0x1C000 to 0x1FFFF (16 Kbytes), as confirmed in the datasheet Notes section (page 6) and Block Diagram (page 2). This differs from the base AT49F001(N) variant, which locates the boot block at 0x00000–0x03FFF. The AT49F001NT-90VC uses the "T" suffix addressing scheme.
Does AT49F001NT-90VC support 12V RESET override for boot block reprogramming?
No, AT49F001NT-90VC does not support 12V RESET override. The datasheet explicitly states "The RESET feature is not available for the AT49F001N(T)" on page 3 and confirms the RESET pin is DC-only (not 12V-capable) for the N(T) variants on page 2. Only the base AT49F001T (non-N, non-NT) supports 12V override.
What package type is used by AT49F001NT-90VC?
AT49F001NT-90VC uses the 32-lead Plastic Thin Small Outline Package (VSOP), 8 mm × 14 mm body size, designated as package code 32V per the Ordering Information table (page 17). Pin 9 is NC (no connect), consistent with TSOP/VSOP variants per datasheet note on page 2.
How is end-of-program detection implemented in AT49F001NT-90VC?
AT49F001NT-90VC supports two hardware-assisted end-of-program detection 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 operation and stabilizes upon completion). Both are defined in the AC Characteristics section (pages 12–13) and require no external clock or timer.
What is the maximum erase time for a full chip erase on AT49F001NT-90VC?
The maximum full chip erase time for AT49F001NT-90VC is 10 seconds, specified as tEC in the Program Cycle Characteristics table (page 11). This applies whether initiated via the six-byte Chip Erase command or automatic internal timing - no external timing circuitry is needed.
AT49F001NT-90VC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tray
- 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-VSOP
AT49F001NT-90VC FAQ
1.How can I place an order for AT49F001NT-90VC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001NT-90VC 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-90VC reliable?
The price and inventory of AT49F001NT-90VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001NT-90VC is usually 5 days.
3.What payment methods are accepted for AT49F001NT-90VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001NT-90VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001NT-90VC?
AT49F001NT-90VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001NT-90VC 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-90VC?
For technical support, including AT49F001NT-90VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001NT-90VC requirements.
6.How does Aetrix verify that AT49F001NT-90VC is sourced from the original manufacturer or authorized distributors?
All AT49F001NT-90VC 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-90VC meets industry standards.
7.What is the process for return or replacement of AT49F001NT-90VC?
All AT49F001NT-90VC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001NT-90VC, 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-90VC part is unused and in its original packaging.
Return procedure for AT49F001NT-90VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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