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Microchip Technology AT49F001NT-70JI
- Part No.:
- AT49F001NT-70JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001NT-70JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F001NT-70JI 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 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-70JI datasheet, AT49F001NT-70JI pinout, AT49F001NT-70JI application, or AT49F001NT-70JI equivalent, key selection criteria include industrial temperature range (−40°C to +85°C), PLCC-32 package compatibility, boot block lockout capability, DATA polling/Toggle Bit end-of-program detection, and 5V-only command interface without high-voltage programming.
Technical Context
The AT49F001NT-70JI implements a standard parallel Flash interface with CE/OE/WE control logic and supports EPROM-like read operation. Its internal program controller manages byte-by-byte programming and sector/chip erase via six-cycle command sequences using address latches on falling WE/CE edges and data latches on rising edges.
It uses a sector-based architecture where the boot block (1C000H–1FFFFH) is programmable lockout-enabled, while parameter blocks (1A000H–1BFFFH, 18000H–19FFFH) and main memory blocks (10000H–17FFFH, 00000H–0FFFFH) support independent erase. RESET pin functionality is disabled per datasheet note for AT49F001N(T) variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8 bits); provides sufficient space for firmware boot code and configuration data in resource-constrained embedded systems. |
| Read Access Time | 70 ns max; ensures compatibility with 14 MHz bus timing in legacy microcontroller designs. |
| Byte Programming Time | 10 µs typical; enables rapid field updates of small data segments without full-chip erase overhead. |
| Erase Cycle Time | 10 seconds max for full chip; allows predictable in-system reprogramming windows during maintenance or firmware upgrades. |
| Operating Voltage | 5 V ±10%; eliminates need for auxiliary high-voltage programming supplies, simplifying power design. |
| Temperature Range | −40°C to +85°C industrial grade; qualified for use in automotive body control modules and industrial PLCs. |
| Standby Current | 100 µA CMOS; minimizes quiescent power draw in battery-backed or low-power sleep modes. |
| Write End Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling); provides software-controlled, deterministic program completion signaling without external timers. |
Pinout & Package
AT49F001NT-70JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), compliant with JEDEC MS-016 Variation AE. Pin 1 is marked by a corner notch; pins are numbered counterclockwise starting from pin 1 at the 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 00000H–1FFFFH. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path for read, program, and identification operations; supports standard microprocessor bus interfacing. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; prevents bus contention when deasserted. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high, enabling shared bus operation. |
| WE | Write Enable | Active-low write strobe; latches address/data during programming/erase command sequences; controls timing of internal pulse generation. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces outputs to high-Z; not functional for boot block override in AT49F001N(T) variants. |
| VCC | Power Supply | +5 V supply; powers core logic and memory array; requires local 0.1 µF decoupling per datasheet layout guidelines. |
| GND | Ground | Reference ground for all signals and power; must be connected to system ground plane with low-inductance path. |
| NC | No Connect | Pin 9 in PLCC package is unconnected; must remain floating-no external tie required. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | Enables permanent storage of secure boot code (16K bytes at 1C000H–1FFFFH) while allowing field updates to parameter and application memory blocks. |
| Hardware Data Protection | VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibition (OE low/CE high/WE high blocks writes) prevent accidental reprogramming. |
| DATA Polling & Toggle Bit | Allows real-time software monitoring of program/erase completion without external hardware timers or status registers. |
| 5V-Only Command Interface | Eliminates need for 12 V programming voltage; reduces BOM count and simplifies PCB layout versus EPROM or older Flash devices. |
| Industrial Temperature Rating | Qualified from −40°C to +85°C; supports deployment in under-hood automotive, factory automation, and outdoor industrial equipment. |
Applications
| Industrial PLC Firmware Storage | Automotive Body Control Module |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O configuration tables in programmable logic controllers deployed in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage device providing fast 70 ns read access for real-time scan cycle execution and byte-level update capability for remote firmware patches. Use Value: Enables zero-downtime field updates via sector erase, reducing maintenance window duration and eliminating need for full board replacement. | Use Scenario: Holding boot loader and calibration data in vehicle door modules, seat controllers, or lighting ECUs exposed to under-dash thermal cycling. IC Role / Device Role / Timing Role: Secure boot memory with lockout-protected 16K boot block ensuring integrity of startup code, while parameter blocks store vehicle-specific trim settings. Use Value: Prevents unauthorized modification of boot code while permitting authorized recalibration of sensor offsets or actuator limits during service. |
| Legacy Microcontroller System Upgrade | Medical Diagnostic Equipment Configuration |
Use Scenario: Replacing obsolete EPROMs in aging medical imaging subsystems where PCB layout cannot accommodate new package footprints. IC Role / Device Role / Timing Role: Drop-in compatible Flash memory with identical PLCC-32 footprint and EPROM-style read timing (70 ns), supporting existing 8051 or Z80 bus cycles. Use Value: Extends product lifecycle without redesign; retains original board layout and timing margins while adding in-system reprogrammability. | Use Scenario: Storing FDA-mandated device configuration profiles, calibration coefficients, and audit logs in portable ultrasound or ECG analyzers requiring traceable firmware history. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile memory with hardware write protection and sector-level erase granularity for regulatory-compliant data management. Use Value: Supports versioned firmware rollbacks and secure parameter updates meeting IEC 62304 software lifecycle requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F001N-70JI | Same density, timing, and package but boot block located at 00000H–03FFFH instead of 1C000H–1FFFFH; lacks RESET-based boot override. | Used where boot code resides in lowest memory region; incompatible with systems expecting high-address boot block mapping. | Select only if legacy design uses low-address boot vector and does not require boot block reprogramming after lockout. |
| SST39VF010-70-4C-NHE | 5V-only 1 Mbit Flash with 70 ns access, PLCC-32, but uses different command set (SST proprietary) and lacks boot block lockout feature. | Requires firmware driver rewrite; suitable for green-field designs where boot protection is managed externally or not required. | Choose when migrating from Atmel platform and accepting software adaptation cost for higher endurance (100K cycles) and lower standby current (30 µA). |
Compared with AT49F001N-70JI, the AT49F001NT-70JI provides relocated boot block addressing for high-memory boot vectors, while SST39VF010 offers superior endurance and lower power but requires command-set redesign and forfeits hardware boot lockout.
Availability
AT49F001NT-70JI is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, legacy system upgrades, and medical device manufacturing requiring stable component supply across extended product lifecycles.
Supply support for AT49F001NT-70JI 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 memory products including the AT49F001 family.
The AT49F001 series was designed for cost-sensitive, 5V-based embedded systems needing reliable in-system reprogrammability without high-voltage programming circuitry, targeting industrial control and automotive sub-systems.
FAQ
What is the boot block address range for AT49F001NT-70JI?
The boot block for AT49F001NT-70JI occupies memory addresses 1C000H to 1FFFFH (16 Kbytes). This high-address location distinguishes it from the AT49F001N variant (00000H–03FFFH) and is confirmed in the datasheet's Notes section and Block Diagram for AT49F001(N)T. The AT49F001NT-70JI uses the T-suffix addressing scheme.
Does AT49F001NT-70JI support 12V RESET-based boot block override?
No, AT49F001NT-70JI does not support 12V RESET-based boot block override. The datasheet explicitly states "The RESET feature is not available for the AT49F001N(T)" and notes that the RESET pin is a DC input on AT49F001N(T) variants. Therefore, once boot block lockout is enabled on AT49F001NT-70JI, reprogramming requires disabling lockout via command sequence before erasing.
What package type is used for AT49F001NT-70JI?
AT49F001NT-70JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package, designated as 32J in Atmel's ordering information. Mechanical dimensions conform to JEDEC MS-016 Variation AE, with pin 1 identified by a corner notch and leads arranged counterclockwise.
How is end-of-program detection implemented in AT49F001NT-70JI?
AT49F001NT-70JI supports two hardware-assisted end-of-program detection methods: DATA polling (reading the last programmed byte returns its complement on I/O7 until completion) and Toggle Bit (I/O6 toggles between 0 and 1 during active programming and stabilizes upon completion). Both methods eliminate need for fixed delay loops in firmware.
What is the maximum erase time for AT49F001NT-70JI?
The maximum erase time for AT49F001NT-70JI is 10 seconds for a full chip erase, as specified in the datasheet's "Fast Erase Cycle Time" feature and AC characteristics table. Sector erase times are not individually specified but fall within this bound; the device internally times all erase operations without external clock dependency.
AT49F001NT-70JI 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:
- 70 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-70JI FAQ
1.How can I place an order for AT49F001NT-70JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001NT-70JI 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-70JI reliable?
The price and inventory of AT49F001NT-70JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001NT-70JI is usually 5 days.
3.What payment methods are accepted for AT49F001NT-70JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001NT-70JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001NT-70JI?
AT49F001NT-70JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001NT-70JI 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-70JI?
For technical support, including AT49F001NT-70JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001NT-70JI requirements.
6.How does Aetrix verify that AT49F001NT-70JI is sourced from the original manufacturer or authorized distributors?
All AT49F001NT-70JI 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-70JI meets industry standards.
7.What is the process for return or replacement of AT49F001NT-70JI?
All AT49F001NT-70JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001NT-70JI, 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-70JI part is unused and in its original packaging.
Return procedure for AT49F001NT-70JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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