My Inquiry
My Account
Microchip Technology AT49F001NT-90TI
- Part No.:
- AT49F001NT-90TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49F001NT-90TI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,431
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT49F001NT-90TI 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, 10 µs/byte typical programming time, and sector-based erase architecture including a 16 KB boot block with programmable lockout. It operates across –40°C to +85°C and is used for firmware storage and code execution in industrial microcontroller systems.
For engineers reviewing the AT49F001NT-90TI datasheet, AT49F001NT-90TI pinout, AT49F001NT-90TI application, or AT49F001NT-90TI equivalent, this page delivers verified electrical specs, PLCC-32 package mapping, boot-block protection behavior, DATA polling/Toggle Bit status detection, and real-world use cases in embedded boot code storage and parameter retention.
Technical Context
The AT49F001NT-90TI implements a command-register-based architecture requiring six-byte software sequences for chip/sector erase and boot lockout enable. Its memory is partitioned into one 16 KB boot block (address range 1C000H–1FFFFH), two 8 KB parameter blocks, and two main memory blocks (32 KB and 64 KB), all erasable independently.
It supports standard EPROM-like read timing with CE/OE/WE control, hardware data protection via VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and dual end-of-operation detection via DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling). RESET pin is DC-only (no 12 V override) per AT49F001N(T) variant specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - directly replaces EPROMs in legacy 8-bit bus systems. |
| Read Access Time | 90 ns max - ensures compatibility with 11 MHz Z80/8051 bus cycles without wait states. |
| Byte Programming Time | 10 µs typical (50 µs max) - enables fast field updates of configuration data without system downtime. |
| Erase Cycle Time | 10 seconds max for full chip or sector - deterministic timing simplifies host firmware timeout handling. |
| End-of-Operation Detection | DATA polling (I/O7) and Toggle Bit (I/O6) - eliminates need for external timers during program/erase. |
| Boot Block Protection | 16 KB (1C000H–1FFFFH), lockout enabled via 6-byte command - secures bootloader code against accidental overwrite. |
| Power Dissipation | 275 mW active (50 mA @ 5 V), 100 µA CMOS standby - suitable for low-power industrial controllers. |
| Endurance | 10,000 write/erase cycles - validated for firmware update cycles over 5+ years in deployed equipment. |
Pinout & Package
AT49F001NT-90TI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package (JEDEC MS-016, Variation AE), measuring 12.57 mm × 15.11 mm × 3.56 mm (max height), with J-leads and pin 1 identifier notch. Pin 1 is DC (no connect) per AT49F001N(T) variant specification.
| 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 location bits. |
| I/O0–I/O7 | Data Input/Output | 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; used with CE to prevent bus contention during shared-memory operation. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence timing. |
| RESET | Reset Input | DC-only input (no 12 V override); forces outputs to high-Z and halts ongoing operations when pulled low. |
| VCC | Power Supply | +5.0 V ±10%; internal VCC sense disables programming if voltage drops below 3.8 V. |
| GND | Ground | Signal and power reference; decoupling capacitor required within 10 mm of VCC/GND pins. |
| NC | No Connect | Pin 1 (PLCC top view) is designated NC - must remain unconnected per datasheet note. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Erase Architecture | Independent erase of 16 KB boot block, two 8 KB parameter blocks, and two main memory blocks (32 KB/64 KB) - enables selective firmware updates without full reflash. |
| Hardware Data Protection | VCC sense (<3.8 V), noise filtering (<15 ns), and control-line inhibition (OE low/CE high/WE high) - prevents spurious writes during power transients or EMI events. |
| Boot Block Lockout | 16 KB region (1C000H–1FFFFH) permanently protected after 6-byte command; lockout status readable at 1C002H - ensures bootloader integrity in unattended systems. |
| DATA Polling & Toggle Bit | I/O7 returns complement until byte program completes; I/O6 toggles during erase/program - eliminates polling delays and simplifies interrupt-driven host firmware. |
| 5V-Only Operation | No external 12 V or 21 V required for programming or erase - reduces BOM count and simplifies power design versus EPROM/EEPROM alternatives. |
| Industrial Temperature Range | –40°C to +85°C operation with 100 µA standby current - certified for deployment in factory automation, motor drives, and outdoor metering. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader |
|---|---|
Use Scenario: Storing and executing boot code and runtime firmware in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with 90 ns read access enabling direct XIP (execute-in-place) from Flash on 8-bit microcontrollers. Use Value: Boot block lockout prevents corruption of critical startup routines during field firmware updates; sector erase allows parameter block updates without disturbing main application code. |
Use Scenario: Securing bootloader and calibration data in Class II medical instruments requiring traceable firmware revisions and tamper resistance. IC Role / Device Role / Timing Role: Trusted boot memory with hardware-enforced write protection for FDA-regulated device initialization sequences. Use Value: 10,000-cycle endurance and 16 KB lockable boot sector ensure long-term reliability and audit-compliant firmware lifecycle management. |
| Automotive Diagnostic Module | Energy Meter Parameter Retention |
Use Scenario: Holding diagnostic firmware and vehicle-specific configuration tables in OBD-II scan tools exposed to automotive temperature cycling. IC Role / Device Role / Timing Role: In-system reprogrammable Flash memory interfacing with 8051 or ARM7TDMI cores via standard parallel bus. Use Value: 10 µs/byte programming enables rapid calibration updates during service; industrial-grade temp range ensures operation from –40°C cold cranking to +85°C under-hood conditions. |
Use Scenario: Storing tariff schedules, metering constants, and security keys in smart electricity meters with 15+ year field life requirements. IC Role / Device Role / Timing Role: High-reliability nonvolatile memory with hardware data protection against power-loss-induced corruption during write cycles. Use Value: 100 µA CMOS standby current minimizes battery drain in backup-powered meters; sector architecture isolates critical keys from routine parameter updates. |
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 | 3.3 V core (5 V tolerant I/O), 90 ns access, same 1 Mbit density and PLCC-32 package. | Requires level-shifting for pure 5 V systems; lacks boot block lockout command set. | Choose for lower active power (20 mA) and migration path to 3.3 V designs; verify RESET and command compatibility. |
| MX29LV160CBTI-90G | 3.0 V core, 90 ns access, 16 Mbit density, TSOP-48 package; boot block at bottom (0x000000). | Higher density but incompatible pinout and voltage; requires PCB redesign and firmware adaptation. | Choose only when scaling memory capacity; not drop-in - evaluate voltage translation, timing margins, and sector map alignment. |
Compared with SST39VF010-90-4C-NHE and MX29LV160CBTI-90G, the AT49F001NT-90TI provides guaranteed 5 V-only operation, hardware-enforced boot block lockout, and identical PLCC-32 footprint - making it the sole option for legacy 5 V industrial systems requiring field-upgradable secure boot code.
Availability
AT49F001NT-90TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader implementation, and automotive diagnostic module development requiring stable component supply and long-term obsolescence management.
Supply support for AT49F001NT-90TI 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 datasheets, errata, and cross-reference tools.
The AT49F001NT-90TI belongs to Atmel's 5 V Flash memory family designed specifically for cost-sensitive, industrial-grade embedded systems needing reliable in-system reprogramming without high-voltage programming circuitry.
FAQ
What is the boot block address range for AT49F001NT-90TI?
The boot block for AT49F001NT-90TI occupies addresses 1C000H to 1FFFFH (16 KB). This differs from the base AT49F001(N) variant (00000H–03FFFH) and is confirmed in the "Notes" section of the datasheet. The boot block lockout feature, once enabled via the 6-byte command sequence, prevents erasure or programming of this region at ≤5.5 V.
Does AT49F001NT-90TI support 12 V RESET override for boot block reprogramming?
No. The AT49F001NT-90TI is an AT49F001N(T) variant, and 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, the 12 V override on RESET to unlock the boot block is absent - boot block protection is permanent once enabled.
What package type is used for AT49F001NT-90TI, and is pin 1 connected?
AT49F001NT-90TI uses a 32-lead PLCC (Plastic Leaded Chip Carrier) package, designated as 32J. Per the ordering information table and note in the datasheet, pin 1 is a "Don't Connect" (DC) terminal - it must remain unconnected on the PCB and is not electrically functional.
How does DATA polling work on AT49F001NT-90TI during byte programming?
During byte programming, reading the just-loaded address returns the bitwise complement of the programmed data on I/O7. When programming completes, true data appears on I/O7. This allows host firmware to poll I/O7 without timers - the transition from complement to true value signals completion, enabling immediate next-cycle initiation for multi-byte writes.
What is the maximum erase time for a single sector on AT49F001NT-90TI?
The datasheet specifies a maximum erase cycle time of 10 seconds for any operation - whether full chip erase or individual sector erase. This value (tEC = 10 s) is guaranteed across the industrial temperature range (–40°C to +85°C) and applies uniformly to all sectors, including the 16 KB boot block (when unlocked) and 8 KB parameter blocks.
AT49F001NT-90TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm 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-TSOP
AT49F001NT-90TI FAQ
1.How can I place an order for AT49F001NT-90TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001NT-90TI 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-90TI reliable?
The price and inventory of AT49F001NT-90TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001NT-90TI is usually 5 days.
3.What payment methods are accepted for AT49F001NT-90TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001NT-90TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001NT-90TI?
AT49F001NT-90TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001NT-90TI 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-90TI?
For technical support, including AT49F001NT-90TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001NT-90TI requirements.
6.How does Aetrix verify that AT49F001NT-90TI is sourced from the original manufacturer or authorized distributors?
All AT49F001NT-90TI 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-90TI meets industry standards.
7.What is the process for return or replacement of AT49F001NT-90TI?
All AT49F001NT-90TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001NT-90TI, 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-90TI part is unused and in its original packaging.
Return procedure for AT49F001NT-90TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F001NT-90TI 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…
