My Inquiry
My Account
Microchip Technology AT49F001NT-90JI
- Part No.:
- AT49F001NT-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001NT-90JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,360
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT49F001NT-90JI 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/byte typical programming, 10-second chip erase, hardware data protection, and sector architecture with 16K-byte boot block lockout. It operates across industrial temperature range (−40°C to +85°C) and supports standard parallel interface timing.
For engineers reviewing the AT49F001NT-90JI datasheet, AT49F001NT-90JI pinout, AT49F001NT-90JI application, or AT49F001NT-90JI equivalent, key selection considerations include boot-block write protection enforcement, 5V-only command compatibility, PLCC-32 package mechanical fit, industrial-grade standby current (300 µA), and DATA polling/Toggle Bit end-of-operation detection.
Technical Context
The AT49F001NT-90JI implements a parallel-addressed, byte-programmable Flash architecture with internal program control logic and auto-timed erase cycles. Its sector map includes one 16K-byte boot block (address range 1C000H–1FFFFH), two 8K-byte parameter blocks, and two main memory blocks (32K and 64K bytes).
It uses standard microprocessor CE/OE/WE control signals for read and write operations, supports software command sequences (e.g., 6-cycle chip erase, 4-cycle byte program), and provides dual end-of-operation detection via DATA polling on I/O7 and Toggle Bit on I/O6 - both usable at any point during programming or erasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8 bits); sufficient for firmware images up to ~128 KB in size |
| Read Access Time | 90 ns max; compatible with 11 MHz bus timing without wait states |
| Byte Programming Time | 10 µs typical; enables fast field updates of small configuration or calibration data |
| Chip Erase Time | 10 seconds max; deterministic internal timing eliminates need for external clocks or polling overhead |
| Endurance | 10,000 program/erase cycles; validated for long-term use in firmware update applications |
| Standby Current | 300 µA max (industrial temp); enables low-power retention in battery-backed systems |
| Operating Voltage | 5.0 V ±10%; single-supply operation simplifies power design vs. multi-voltage Flash |
Pinout & Package
AT49F001NT-90JI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE. Dimensions: 12.57 mm × 15.11 mm × 3.56 mm (max height), with J-leads and pin 1 identifier corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A16 required for boot block access at 1C000H–1FFFFH |
| I/O0–I/O7 | Data Inputs/Outputs | 8-bit bidirectional data bus; I/O7 used for DATA polling, I/O6 for Toggle Bit status monitoring |
| 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; enables high-impedance state when high to prevent bus contention |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence timing |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; 12 V override enables boot block reprogramming |
| VCC / GND | Power Supply | 5 V supply and ground; VCC sense circuitry inhibits programming if voltage drops below 3.8 V |
| NC | No Connect | Pin 32 (PLCC); must remain unconnected per datasheet - not tied to VCC/GND or pulled |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16K-byte region (1C000H–1FFFFH) permanently protected after enable command; prevents accidental overwrite of bootloader code |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulse rejection), and control-line inhibit (OE low/CE high/WE high) prevent spurious writes |
| DATA Polling & Toggle Bit | Real-time, software-driven operation completion detection without timer dependencies or external hardware |
| Sector-Erasable Architecture | Independent erasure of parameter blocks (8K each) and main memory blocks (32K/64K); enables selective firmware updates |
| 5V-Only Command Set | No 12 V programming voltage required; simplifies system-level power design and eliminates HV charge pumps |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
|
Use Scenario: Storing immutable bootloader and field-upgradable application firmware in programmable logic controllers with extended service life requirements. IC Role / Device Role / Timing Role: Nonvolatile code storage IC providing reliable read access (<90 ns) and secure in-system reprogramming capability. Use Value: Boot block lockout ensures bootloader integrity across 10,000+ field updates; industrial temperature rating supports operation in factory-floor enclosures. |
Use Scenario: Holding certified boot code and regulatory-compliant firmware in Class II medical instruments requiring traceable, tamper-resistant storage. IC Role / Device Role / Timing Role: Secure Flash memory with hardware-enforced write protection and deterministic erase timing for audit-ready firmware lifecycle management. Use Value: RESET-pin 12 V override allows authorized reprogramming of protected boot sectors during service; 300 µA standby current extends battery backup duration. |
| Automotive Diagnostic Module Code | Legacy Industrial HMI Configuration Storage |
|
Use Scenario: Hosting diagnostic application code and vehicle-specific calibration tables in OBD-II modules operating across wide ambient temperatures. IC Role / Device Role / Timing Role: Parallel-interface Flash memory delivering consistent 90 ns read performance under automotive thermal stress (-40°C to +85°C). Use Value: Sector architecture enables independent update of calibration data (parameter blocks) without erasing mission-critical diagnostic logic (main memory). |
Use Scenario: Retaining user-configurable display layouts, I/O mapping, and alarm thresholds in human-machine interface terminals deployed in manufacturing lines. IC Role / Device Role / Timing Role: Field-reprogrammable nonvolatile memory supporting infrequent but critical configuration changes via standard microcontroller parallel bus. Use Value: Byte-by-byte programming (10 µs/byte) minimizes downtime during configuration updates; PLCC-32 package ensures mechanical reliability in vibration-prone environments. |
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 | 5V-only, 1 Mbit, 90 ns access, PLCC-32; lacks boot block lockout and RESET-based override | Supports basic firmware storage but no hardware-enforced bootloader protection | Choose when boot security is managed externally or unnecessary; verify command set compatibility before migration |
| MX29LV160CBTI-90G | 3V/5V tolerant, 16 Mbit, 90 ns, TSOP-48; includes CFI query and enhanced sector protection | Higher density and modern packaging; requires voltage translation and PCB redesign | Consider for new designs needing scalability; not drop-in due to pin count, voltage, and sector layout differences |
Compared with SST39VF010-90-4C-NHE and MX29LV160CBTI-90G, the AT49F001NT-90JI uniquely delivers industrial-temp boot block lockout with 12 V RESET override in a legacy-compatible PLCC-32 footprint - critical for maintaining firmware integrity in field-deployed systems without board revision.
Availability
AT49F001NT-90JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, and automotive diagnostic module code requiring stable component supply and long-term obsolescence support.
Supply support for AT49F001NT-90JI 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 AT49F001NT-90JI belongs to Atmel's parallel-interface Flash memory product line, designed specifically for cost-sensitive, industrial-grade embedded systems requiring in-system reprogrammability and hardware write protection.
FAQ
What is the boot block address range for AT49F001NT-90JI?
The boot block for AT49F001NT-90JI occupies addresses 1C000H to 1FFFFH (16 Kbytes). This differs from the base AT49F001(N) variant, which locates the boot block at 00000H–03FFFH. The AT49F001NT-90JI's upper-address boot block placement avoids conflict with main application code in lower memory space.
Does AT49F001NT-90JI support 12 V programming voltage?
No - the AT49F001NT-90JI is strictly 5V-only for all operations including read, program, and erase. However, applying 12.0 V ±0.5 V to the RESET pin enables override of the boot block programming lockout feature, allowing reprogramming of the protected sector without changing VCC.
How is end-of-program detection implemented in AT49F001NT-90JI?
The AT49F001NT-90JI supports two hardware-assisted methods: DATA polling (I/O7 returns complement of written data until completion, then true data) and Toggle Bit (I/O6 toggles between 0/1 during operation and stabilizes upon completion). Both are usable at any time during programming or erasing without external timers.
What is the meaning of the "NT" suffix in AT49F001NT-90JI?
The "NT" denotes the specific variant combining the "N" (no RESET functionality in earlier versions) and "T" (top-boot architecture with boot block at high address 1C000H–1FFFFH). The AT49F001NT-90JI retains RESET functionality (unlike pure "N") and uses top-boot organization (like "T"), confirmed by datasheet section "AT49F001(N)T" and ordering table.
Can AT49F001NT-90JI be used in place of AT49F001N-90JI?
No - AT49F001NT-90JI and AT49F001N-90JI are not interchangeable. The "NT" variant has top-boot architecture (boot block at 1C000H–1FFFFH) and functional RESET pin with 12 V override, while the "N" variant has bottom-boot (00000H–03FFFH) and no RESET functionality. Software and hardware initialization must match the boot block location.
AT49F001NT-90JI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F001NT-90JI FAQ
1.How can I place an order for AT49F001NT-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001NT-90JI 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-90JI reliable?
The price and inventory of AT49F001NT-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001NT-90JI is usually 5 days.
3.What payment methods are accepted for AT49F001NT-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001NT-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001NT-90JI?
AT49F001NT-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001NT-90JI 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-90JI?
For technical support, including AT49F001NT-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001NT-90JI requirements.
6.How does Aetrix verify that AT49F001NT-90JI is sourced from the original manufacturer or authorized distributors?
All AT49F001NT-90JI 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-90JI meets industry standards.
7.What is the process for return or replacement of AT49F001NT-90JI?
All AT49F001NT-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001NT-90JI, 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-90JI part is unused and in its original packaging.
Return procedure for AT49F001NT-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F001NT-90JI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
