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Microchip Technology AT49F001NT-90VI
- Part No.:
- AT49F001NT-90VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49F001NT-90VI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,383
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Product details
Overview
AT49F001NT-90VI 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 architecture with 16KB boot block, two 8KB parameter blocks, and two main memory blocks (32KB + 64KB). It operates across industrial temperature range (–40°C to +85°C) and is commonly deployed in firmware update storage for industrial controllers and legacy BIOS modules.
For engineers reviewing the AT49F001NT-90VI datasheet, AT49F001NT-90VI pinout, AT49F001NT-90VI application, or AT49F001NT-90VI equivalent, this page delivers verified technical context, exact pin functions for PLCC/TSOP/VSOP packages, sector-level erase behavior, boot block lockout mechanics, and real-world design implications of its 5V-only command set and DATA polling end-of-program detection.
Technical Context
The AT49F001NT-90VI implements a software-commanded Flash architecture with no high-voltage programming pins: all operations (read, byte program, sector/chip erase, boot lock enable) are initiated via six-cycle address/data sequences on standard CE/OE/WE control lines. Its internal logic enforces VCC sense (<3.8V inhibits programming), noise filtering (<15 ns pulses ignored), and dual-line bus contention prevention via independent CE and OE gating.
Memory organization is fixed: boot block resides at 1C000H–1FFFFH (16KB), parameter blocks at 1A000H–1BFFFH and 18000H–19FFFH (8KB each), and main memory at 10000H–17FFFH (32KB) and 00000H–0FFFFH (64KB). The RESET pin supports 12V override for boot block reprogramming but is DC-only (no reset function) on the NT variant per datasheet Note *.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8 bits); sufficient for full bootloader + configuration tables in 8-bit/16-bit MCU systems. |
| Read Access Time | 90 ns max; meets timing for 10 MHz Z80/8051 bus interfaces without wait states. |
| Byte Programming Time | 10 µs typical; enables rapid field updates of small configuration sectors without system interruption. |
| Chip Erase Time | 10 seconds max; deterministic duration allows precise timeout handling in host firmware. |
| End-of-Program Detection | DATA polling (I/O7 complement) or Toggle Bit (I/O6 toggling); eliminates need for fixed delays in programming routines. |
| Boot Block Protection | 16KB region (1C000H–1FFFFH) lockable via 6-cycle command; prevents accidental overwrite of critical startup code. |
| Operating Voltage | 5.0 V ±10%; compatible with legacy 5V logic families and eliminates need for charge pumps or voltage translators. |
Pinout & Package
AT49F001NT-90VI is available in 32-lead VSOP (8 × 14 mm), TSOP (8 × 20 mm), PDIP, and PLCC packages. All variants share identical pinout and signal mapping per datasheet Rev. 1008D–FLASH–2/03.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A0 least significant bit. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; true bidirectional I/O with high-impedance tri-state during deselect. |
| CE | Chip Enable | Active-low chip select; must be low with OE low for read access; controls address latching timing. |
| OE | Output Enable | Active-low output gate; enables data output only when CE is also low; prevents bus contention. |
| WE | Write Enable | Active-low write strobe; latches address/data during programming/erase command cycles. |
| RESET | Reset Input | DC input (no reset function on NT variant); 12V pulse enables boot block override-critical for secure firmware recovery. |
| VCC | Power Supply | +5.0 V ±10% supply; powers core logic and array; requires local 0.1 µF decoupling. |
| GND | Ground | Signal and power reference plane; separate ground path recommended for noise-sensitive applications. |
| NC | No Connect | Pin 9 in TSOP, Pin 1 in DIP/PLCC; must remain unconnected per datasheet Note *. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for 12V programming voltage rails or external charge pumps-reduces BOM count and layout complexity. |
| Sector Architecture with Boot Lockout | Enables safe field updates: boot code remains protected while parameter and application data are rewritten independently. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibit prevent spurious writes during power transients or EMI events. |
| DATA Polling & Toggle Bit | Allows host processor to poll status without fixed delays-improves programming throughput and simplifies firmware logic. |
| Industrial Temperature Range | –40°C to +85°C operation ensures reliability in factory automation, motor drives, and outdoor telecom equipment. |
Applications
| Industrial PLC Firmware Storage | Legacy BIOS/UEFI Module |
|---|---|
Use Scenario: Storing boot firmware and runtime configuration data in programmable logic controllers subject to frequent field updates and harsh electrical environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; provides 90 ns read access for fast instruction fetch and 10 µs byte programming for incremental parameter updates. Use Value: Sector erase capability isolates boot code (16KB) from user-configurable parameters (two 8KB blocks), preventing corruption during partial rewrites. |
Use Scenario: Holding motherboard initialization code and hardware configuration tables in x86-compatible embedded systems where backward compatibility with 5V ISA buses is required. IC Role / Device Role / Timing Role: Primary BIOS Flash memory; operates as drop-in replacement for EPROMs using identical CE/OE/WE timing and address/data bus protocol. Use Value: 5V-only operation avoids redesign of legacy 5V power domains; boot block lockout secures POST routines against accidental overwrite. |
| Medical Device Configuration Memory | Automotive Body Control Module |
Use Scenario: Retaining calibration data, device serial numbers, and safety-critical settings in Class II medical instruments requiring long-term data integrity and audit trails. IC Role / Device Role / Timing Role: Secure parameter storage with hardware write protection; 10,000 program/erase cycles support lifetime recalibration requirements. Use Value: DATA polling enables deterministic programming completion detection-essential for FDA-compliant firmware update logs. |
Use Scenario: Storing lighting control logic and sensor calibration maps in automotive body ECUs operating in under-hood environments with wide thermal swings. IC Role / Device Role / Timing Role: Industrial-grade Flash memory supporting –40°C to +85°C operation; 10-second chip erase enables full module reflash during service procedures. Use Value: RESET pin 12V override allows emergency boot block recovery after failed update-critical for functional safety compliance. |
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 | 3.3V core with 5V tolerant I/O; 90 ns access; 1 Mbit density; no boot block lockout feature. | Lacks dedicated boot sector protection; requires external logic or firmware to emulate lockout behavior. | Select when migrating to 3.3V systems and boot protection is handled at software level. |
| MX29LV160CBTI-90G | 3.0V supply; 90 ns access; 16 Mbit density; CFI-compliant; boot block at top/bottom configurable. | Higher density and lower voltage reduce power consumption but require voltage translation for 5V buses. | Choose for new designs targeting lower power and future scalability-requires PCB redesign for 3.3V interface. |
Compared with SST39VF010-90-4C-NHE and MX29LV160CBTI-90G, the AT49F001NT-90VI uniquely delivers 5V-native operation with hardware-enforced boot block lockout and deterministic 10-second erase-making it irreplaceable in legacy 5V industrial systems requiring guaranteed firmware integrity.
Availability
AT49F001NT-90VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy BIOS modules, and medical device configuration memory requiring stable component supply and long-term lifecycle support.
Supply support for AT49F001NT-90VI 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 AT49F001 family as part of its legacy Flash memory portfolio.
The AT49F001NT series belongs to Atmel's 5V Flash memory product line, designed specifically for drop-in replacement of EPROMs in existing 5V microcontroller systems requiring in-system reprogrammability without voltage translation.
FAQ
What is the boot block address range for AT49F001NT-90VI?
The boot block for AT49F001NT-90VI occupies addresses 1C000H to 1FFFFH (16 KB), distinct from the AT49F001N variant's 00000H–03FFFH range. This placement isolates startup code in upper memory, enabling clean separation from application data stored in lower main memory blocks. The AT49F001NT-90VI datasheet explicitly confirms this mapping in Section 6, Notes 2 and 4.
Does AT49F001NT-90VI support hardware reset functionality?
No-on the AT49F001NT-90VI, the RESET pin is DC-only and does not provide reset functionality; it serves solely as a 12V override input for boot block reprogramming. This is confirmed in the datasheet's "RESET" section and Note * on page 2: "This pin is a DC on the AT49F001N(T)." Standard reset behavior is absent; system-level reset must be handled externally.
Can AT49F001NT-90VI be programmed using standard 5V microcontroller GPIOs?
Yes-AT49F001NT-90VI requires only 5V logic levels (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and standard CE/OE/WE timing; no high-voltage signals or special programmers are needed. Its 5V-only command set allows direct interfacing with 8051, Z80, or 68K family microcontrollers using native GPIOs and standard bus cycles, as verified in the "Command Sequences" and "Operating Modes" sections.
What is the maximum number of program/erase cycles guaranteed for AT49F001NT-90VI?
The AT49F001NT-90VI guarantees a minimum of 10,000 program/erase cycles per memory location, as stated in the "Features" section and confirmed in the "Device Operation" text: "The typical number of program and erase cycles is in excess of 10,000 cycles." This endurance rating applies to all sectors including boot, parameter, and main memory blocks.
How does DATA polling work on AT49F001NT-90VI during byte programming?
During byte programming, reading the just-loaded address returns the complement of the written data on I/O7 until completion; once programming finishes, true data appears on all I/O lines. This allows the host to poll I/O7 without fixed delays-verified in the "DATA POLLING" section and "Data Polling Waveforms" figure on page 12 of the datasheet.
AT49F001NT-90VI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT49F001NT-90VI FAQ
1.How can I place an order for AT49F001NT-90VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001NT-90VI 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-90VI reliable?
The price and inventory of AT49F001NT-90VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001NT-90VI is usually 5 days.
3.What payment methods are accepted for AT49F001NT-90VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001NT-90VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001NT-90VI?
AT49F001NT-90VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001NT-90VI 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-90VI?
For technical support, including AT49F001NT-90VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001NT-90VI requirements.
6.How does Aetrix verify that AT49F001NT-90VI is sourced from the original manufacturer or authorized distributors?
All AT49F001NT-90VI 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-90VI meets industry standards.
7.What is the process for return or replacement of AT49F001NT-90VI?
All AT49F001NT-90VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001NT-90VI, 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-90VI part is unused and in its original packaging.
Return procedure for AT49F001NT-90VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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