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Microchip Technology AT49F002NT-70JC
- Part No.:
- AT49F002NT-70JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002NT-70JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,836
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Product details
Overview
AT49F002NT-70JC from Atmel is a 5V-only, 2 Mbit (256K × 8) in-system reprogrammable Flash memory IC with 70 ns read access time, sector-based architecture (16K-byte boot block + two 8K-byte parameter blocks + two main memory blocks), and hardware data protection. It operates across 0°C to 70°C and supports byte-by-byte programming at 10 µs/byte typical for embedded firmware storage in microcontroller-based systems.
For engineers reviewing the AT49F002NT-70JC datasheet, AT49F002NT-70JC pinout, AT49F002NT-70JC application, or AT49F002NT-70JC equivalent, key selection considerations include its PLCC-32 package, 5V single-supply operation, boot block lockout feature, DATA polling/Toggle Bit erase-program status detection, and compatibility with standard EPROM read timing interfaces.
Technical Context
The AT49F002NT-70JC implements a command-register-based architecture requiring six-bus-cycle sequences for chip/sector erase and boot lockout enable, with internal program control eliminating external high-voltage requirements. Its sector organization enables selective erasure of parameter blocks (8K × 2) and main memory blocks (96K + 128K), while the boot block (16K) resides at address 3C000H–3FFFFH for AT49F002(N)T variants.
Hardware protection includes VCC sense (<3.8V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibition (OE low / CE high / WE high blocks writes). RESET pin supports both standard reset and 12V override for boot block reprogramming - a capability confirmed absent in AT49F002N(T) but present in AT49F002NT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), enabling full firmware image storage for 8-bit MCUs without external expansion. |
| Read Access Time | 70 ns maximum - meets timing for 14 MHz bus interfaces in legacy industrial controllers. |
| Byte Programming Time | 10 µs typical - allows rapid field updates of configuration parameters without system downtime. |
| Erase Cycle Time | 10 seconds max for full chip erase - supports batch reprogramming in production test environments. |
| End-of-Operation Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delay timers in host firmware. |
| Power Dissipation | 50 mA active / 100 µA CMOS standby - suitable for battery-backed or low-power wake-on-event applications. |
| Endurance | 10,000 write/erase cycles - validated for firmware update cycles over 5+ years in deployed equipment. |
Pinout & Package
AT49F002NT-70JC uses a 32-lead Plastic J-leaded Chip Carrier (PLCC) package with 1.27 mm pitch, 18.5 × 18.5 mm body, and pin 1 index mark. Pin 1 is DC (don't connect) per datasheet Rev. 1017D–10/99.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A16 used for standard access, A17 selects upper memory region. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access - prevents bus contention in shared-memory systems. |
| OE | Output Enable | Active-low output control; used with CE to gate data outputs independently - essential for multiplexed bus arbitration. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence - enables standard microprocessor write timing compliance. |
| RESET | Reset Input | Active-low reset halts operations and forces high-Z outputs; 12V input overrides boot block lockout - critical for secure bootloader recovery. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with 8051, Z80, and 68K families; supports true read/write without external transceivers. |
| VCC / GND | Power Supply | 5.0V ±10% supply; decoupling required within 10 mm of pins due to fast 70 ns switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | 16K-byte boot block (3C000H–3FFFFH) can be permanently write-protected via command sequence - ensures bootloader integrity during field firmware updates. |
| Single 5V Supply Operation | Eliminates need for +12V or +25V programming voltages - simplifies power design and enables direct connection to MCU I/O rails. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibition prevent accidental writes during power-up/down or EMI events - reduces field failure risk in industrial environments. |
| DATA Polling & Toggle Bit | Real-time program/erase completion feedback via I/O7 complement or I/O6 toggling - removes reliance on worst-case timing margins in host software. |
| Fast Byte Programming | 10 µs/byte typical enables sub-100 ms reprogramming of 10K-byte parameter sets - supports dynamic calibration data updates in test equipment. |
Applications
| Industrial PLC Firmware Storage | Medical Device Configuration Memory |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O mapping tables in programmable logic controllers with periodic field updates via RS-232 or USB-to-parallel adapters. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped into MCU address space; 70 ns access satisfies 14 MHz bus timing with no wait states. Use Value: Sector erase allows updating only logic modules without disturbing safety-critical boot code, reducing update window and validation overhead. | Use Scenario: Retaining calibrated sensor offsets, user preferences, and audit logs in portable diagnostic devices powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-power configuration store accessed infrequently; 100 µA standby current extends battery life beyond 6 months in sleep mode. Use Value: Hardware write protection prevents corruption during brown-out conditions, ensuring regulatory compliance with IEC 62304 data integrity requirements. |
| Automotive Body Control Module | Telecom Line Card Bootloader |
Use Scenario: Hosting firmware for door lock actuators, lighting control, and CAN gateway logic in passenger vehicles operating across -40°C to +85°C. IC Role / Device Role / Timing Role: In-system reprogrammable flash memory interfaced to 8-bit automotive MCU; operates reliably at 70°C case temperature. Use Value: RESET pin 12V override enables factory reflash of locked bootloader after ECU rework - avoids costly module replacement. | Use Scenario: Storing secure bootloader code that validates signed firmware images before loading application processors on telecom line cards. IC Role / Device Role / Timing Role: Read-only boot memory with permanent lockout enabled; accessed once at power-on reset with strict timing (70 ns tACC). Use Value: Boot block programming lockout prevents unauthorized modification of cryptographic keys - satisfies Common Criteria EAL4+ secure boot requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002T-70JC | Lacks RESET pin functionality; no 12V boot override capability; otherwise identical timing, density, and sector map. | Not suitable where field bootloader recovery is required; acceptable for cost-sensitive consumer applications with controlled update paths. | Select AT49F002T-70JC only if RESET pin functionality is unused and BOM cost reduction is prioritized. |
| SST39VF020-70-4C-NHE | 4 Mbit (512K × 8), 70 ns access, 3.3V core (5V tolerant I/O), different command set, no boot lockout, TSOP-32 package. | Requires level-shifting for 5V-only systems; lacks hardware-protected boot sector; better suited for new designs migrating to 3.3V domains. | Choose SST39VF020 only when upgrading memory capacity and accepting redesign effort for voltage translation and firmware adaptation. |
Compared with AT49F002T-70JC, the AT49F002NT-70JC adds critical 12V RESET override for bootloader recovery, while SST39VF020 offers higher density and lower voltage operation at the cost of architectural compatibility and boot security - making AT49F002NT-70JC optimal for legacy 5V industrial systems requiring field-serviceable secure boot.
Availability
AT49F002NT-70JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device configuration memory, and automotive body control module applications requiring stable component supply and long-term obsolescence management.
Supply support for AT49F002NT-70JC 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
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and IoT applications.
The AT49F002(N)(T) product line delivers 5V-only Flash memory optimized for in-system reprogrammability in legacy 8-bit embedded systems, emphasizing boot security, hardware write protection, and EPROM-compatible timing.
FAQ
What is the boot block address range for AT49F002NT-70JC?
The boot block for AT49F002NT-70JC occupies addresses 3C000H to 3FFFFH (16K bytes), consistent with the AT49F002(N)T family designation. This differs from the AT49F002(N) variant, which places the boot block at 00000H–03FFFH. The AT49F002NT-70JC datasheet confirms this mapping in the Block Diagram and Command Definitions sections.
Does AT49F002NT-70JC support 12V programming voltage?
No, AT49F002NT-70JC does not require or support 12V for programming - it is strictly 5V-only. However, a 12V ±0.5V signal applied to the RESET pin enables override of the boot block programming lockout, allowing reprogramming of protected sectors. This 12V function is for RESET pin override only, not for core programming.
What package type is used by AT49F002NT-70JC?
AT49F002NT-70JC uses a 32-lead Plastic J-leaded Chip Carrier (PLCC) package, designated as 32J in Atmel's ordering information. The package features a 18.5 × 18.5 mm body, 1.27 mm lead pitch, and pin 1 index mark. Pin 1 is marked as "DC" (don't connect) per the official datasheet Rev. 1017D–10/99.
How is end-of-program detection implemented in AT49F002NT-70JC?
AT49F002NT-70JC provides two hardware-supported 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 programming/erasing, then stabilizes). Both methods eliminate fixed-timing delays in host firmware and are fully documented in the AC Characteristics and Waveforms sections of the datasheet.
Is AT49F002NT-70JC pin-compatible with AT49F002N-70JC?
Yes, AT49F002NT-70JC is pin-compatible with AT49F002N-70JC in the same PLCC-32 package, sharing identical pin functions (A0–A17, CE, OE, WE, I/O0–I/O7, VCC, GND, RESET). The key functional difference is that AT49F002NT-70JC retains the RESET pin functionality including 12V override, whereas AT49F002N(T) variants omit RESET entirely per datasheet Section 3 ("RESET feature is not available for the AT49F002N(T)").
AT49F002NT-70JC 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:
- 2Mbit
- Memory Organization:
- 256K 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F002NT-70JC FAQ
1.How can I place an order for AT49F002NT-70JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002NT-70JC 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 AT49F002NT-70JC reliable?
The price and inventory of AT49F002NT-70JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002NT-70JC is usually 5 days.
3.What payment methods are accepted for AT49F002NT-70JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002NT-70JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002NT-70JC?
AT49F002NT-70JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002NT-70JC 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 AT49F002NT-70JC?
For technical support, including AT49F002NT-70JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002NT-70JC requirements.
6.How does Aetrix verify that AT49F002NT-70JC is sourced from the original manufacturer or authorized distributors?
All AT49F002NT-70JC 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 AT49F002NT-70JC meets industry standards.
7.What is the process for return or replacement of AT49F002NT-70JC?
All AT49F002NT-70JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002NT-70JC, 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 AT49F002NT-70JC part is unused and in its original packaging.
Return procedure for AT49F002NT-70JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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