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Microchip Technology AT49F001N-90JC
- Part No.:
- AT49F001N-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001N-90JC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,490
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Product details
Overview
AT49F001N-90JC 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-based architecture with a 16 KB boot block supporting lockout. It is commonly deployed in firmware update storage for industrial controllers and legacy BIOS modules.
For engineers reviewing the AT49F001N-90JC datasheet, AT49F001N-90JC pinout, AT49F001N-90JC application, or AT49F001N-90JC equivalent, key selection considerations include its PLCC-32 package, 5V-only operation, boot-block write protection capability, sector erase granularity, and compatibility with standard EPROM-like bus interface timing.
Technical Context
The AT49F001N-90JC implements a command-register-based Flash architecture with software-controlled erase and program operations using six-byte unlock sequences (e.g., 5555H/AAH → 2AAAH/55H → 5555H/80H). Its memory is partitioned into one 16 KB boot block (00000H–03FFFH), two 8 KB parameter blocks, and two main memory blocks (32 KB and 64 KB), enabling selective firmware updates without disturbing boot code.
It supports DATA polling (I/O7 complement) and toggle-bit (I/O6) methods to detect program/erase completion, operates with TTL/CMOS-compatible control inputs (CE/OE/WE), and includes VCC sense, noise filtering, and input-level inhibition to prevent inadvertent writes. The RESET pin is DC-connected and not used for boot override on this variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - directly replaces 27C010 EPROMs in socketed designs. |
| Read Access Time | 90 ns max - ensures compatibility with 10 MHz Z80, 8051, and 68K-based systems requiring fast instruction fetch. |
| Byte Programming Time | 10 µs typical - enables rapid field updates of small configuration or calibration data segments. |
| Chip Erase Time | 10 seconds max - allows full firmware replacement within acceptable maintenance windows for industrial equipment. |
| Endurance | 10,000 program/erase cycles - supports long-term deployment in devices requiring periodic firmware patches. |
| Power Dissipation | 50 mA active current / 100 µA CMOS standby - suitable for low-power embedded systems with battery backup. |
| Operating Voltage | 5.0 V ±10% - eliminates need for external voltage translators in legacy 5V logic environments. |
Pinout & Package
AT49F001N-90JC is housed in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE, with lead pitch 1.27 mm and body size 12.5 mm × 14.9 mm. Pin 1 is marked by a corner notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A0 is LSB, A16 is MSB. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path for read, program, and identification modes; high-impedance when deselected. |
| 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 manage bus contention during multi-device sharing. |
| WE | Write Enable | Active-low write strobe; latches addresses and data during command sequences and byte programming. |
| RESET | Reset Input | DC-connected pin (not 12V-capable); forces outputs to high-Z and halts ongoing operations on low assertion. |
| VCC | Power Supply | +5V supply pin; internal VCC sense circuitry inhibits programming if voltage drops below ~3.8V. |
| GND | Ground | Reference ground for all I/O and internal logic; requires low-impedance connection for stable erase/program margins. |
| NC | No Connect | Pin 1 (PLCC top view) is unconnected - must remain floating per datasheet; no PCB trace or pull-up/down. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | Enables permanent protection of 16 KB boot code (00000H–03FFFH) while allowing field updates to parameter and application memory blocks. |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulse rejection), and multi-input inhibit (OE low/CE high/WE high) prevent accidental writes during power transients or noise events. |
| DATA Polling & Toggle Bit Detection | Allows host processor to poll I/O7 or monitor I/O6 toggling to determine program/erase completion without fixed timing delays or external clocks. |
| 5V-Only In-System Reprogrammability | Eliminates need for +12V programming supplies; uses standard microprocessor write cycles and command sequences compatible with existing 5V system buses. |
| Standard EPROM-Compatible Interface | Uses CE/OE/WE control signals and timing behavior identical to UV-erasable EPROMs, enabling drop-in replacement in legacy designs. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Modules |
|---|---|
Use Scenario: Storing boot firmware and configuration parameters in programmable logic controllers where field updates must preserve boot integrity. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector-locked boot block; interfaces via 8-bit parallel bus with 90 ns read timing. Use Value: Enables safe over-the-air or local firmware patching without risk of bricking the controller due to corrupted boot code. |
Use Scenario: Replacing obsolete 27C010 EPROMs in desktop motherboard BIOS chips requiring in-circuit reprogramming. IC Role / Device Role / Timing Role: Direct socket-compatible Flash memory with EPROM-equivalent read timing and CE/OE/WE control. Use Value: Eliminates UV eraser dependency and supports factory and service-center BIOS updates using standard ISP tools. |
| Embedded Instrument Calibration Storage | Telecom Line Card Configuration |
Use Scenario: Holding calibrated sensor coefficients and operational thresholds in portable test equipment subject to recalibration cycles. IC Role / Device Role / Timing Role: Parameter block storage (two 8 KB sections) accessed via byte-programming for infrequent but critical updates. Use Value: Guarantees data retention >20 years and supports 10,000+ recalibration cycles without memory wear-out concerns. |
Use Scenario: Storing line-specific initialization tables and protocol stacks in modular telecom access equipment. IC Role / Device Role / Timing Role: Dual-main-memory-block architecture (32 KB + 64 KB) supports A/B firmware partitioning for zero-downtime upgrades. Use Value: Allows one memory block to run live traffic while the other is erased and reprogrammed, ensuring continuous service availability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV001MT-90EC | 3.3V core with 5V I/O tolerance; 90 ns read; 1 Mbit; PLCC-32; lacks boot-block lockout command sequence. | Requires level-shifting for pure 5V systems; no hardware-enforced boot protection - relies on software locks. | Select only if migrating toward lower-voltage design; verify command set compatibility before firmware integration. |
| SST39VF010-90-4C-NHE | 3.3V operation only; 90 ns read; 1 Mbit; PLCC-32; supports byte-write but no dedicated boot-block lockout feature. | Not pin-compatible in 5V systems; incompatible VCC requirement prevents direct substitution without board redesign. | Use only in new 3.3V designs; not suitable as drop-in replacement for AT49F001N-90JC in legacy 5V infrastructure. |
Compared with AM29LV001MT-90EC and SST39VF010-90-4C-NHE, the AT49F001N-90JC uniquely delivers 5V-only operation with hardware-enforced boot-block write protection, making it the sole option among these three for maintaining secure, field-upgradable firmware in legacy 5V industrial controllers without layout changes.
Availability
AT49F001N-90JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS modules, embedded instrument calibration storage, and telecom line card configuration requiring stable component supply across extended product lifecycles.
Supply support for AT49F001N-90JC 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 of parallel-interface Flash memories, emphasizing reliability and long-term availability for industrial and automotive applications.
The AT49F001N-90JC belongs to Atmel's legacy parallel Flash product line, designed specifically for 5V embedded systems requiring in-system reprogrammability, sector-level erase control, and robust hardware data protection in harsh operating environments.
FAQ
What is the memory organization of the AT49F001N-90JC?
The AT49F001N-90JC contains 1 Mbit (131,072 × 8) of Flash memory organized as 128K words × 8 bits. Its physical layout includes one 16 KB boot block (00000H–03FFFH), two 8 KB parameter blocks, and two main memory blocks (32 KB and 64 KB). This structure enables selective erasure and programming, and the boot block supports hardware lockout to protect critical startup code.
Does the AT49F001N-90JC support 12V reset-based boot block override?
No, the AT49F001N-90JC does not support 12V reset-based boot block override. Per the datasheet, this feature is explicitly unavailable on the AT49F001N(T) variant. The RESET pin on the AT49F001N-90JC is DC-connected and functions only as a standard reset input - it cannot be driven to 12V to disable boot block lockout.
What package type is used for the AT49F001N-90JC?
The AT49F001N-90JC uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, designated as 32J per Atmel's ordering information. Its dimensions conform to JEDEC MS-016, Variation AE, with a body size of approximately 12.5 mm × 14.9 mm and 1.27 mm lead pitch. Pin 1 is identified by a corner notch.
How is the end of a program cycle detected on the AT49F001N-90JC?
The AT49F001N-90JC supports two hardware methods to detect program completion: DATA polling and Toggle Bit. During programming, reading the last written byte returns the complement of the data on I/O7 until completion, then true data appears. Alternatively, I/O6 toggles between 0 and 1 during the operation and stops toggling once complete - both methods eliminate need for fixed timing delays.
Can the AT49F001N-90JC be used as a direct replacement for the 27C010 EPROM?
Yes, the AT49F001N-90JC is designed as a functional and pin-compatible replacement for the 27C010 EPROM in 5V systems. It matches the 32-pin PLCC footprint, uses identical CE/OE/WE control signals, and provides EPROM-equivalent read timing (90 ns). Unlike the 27C010, it supports in-system reprogramming without UV erasure or high-voltage programmers.
AT49F001N-90JC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F001N-90JC FAQ
1.How can I place an order for AT49F001N-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001N-90JC 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 AT49F001N-90JC reliable?
The price and inventory of AT49F001N-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001N-90JC is usually 5 days.
3.What payment methods are accepted for AT49F001N-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001N-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001N-90JC?
AT49F001N-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001N-90JC 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 AT49F001N-90JC?
For technical support, including AT49F001N-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001N-90JC requirements.
6.How does Aetrix verify that AT49F001N-90JC is sourced from the original manufacturer or authorized distributors?
All AT49F001N-90JC 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 AT49F001N-90JC meets industry standards.
7.What is the process for return or replacement of AT49F001N-90JC?
All AT49F001N-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001N-90JC, 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 AT49F001N-90JC part is unused and in its original packaging.
Return procedure for AT49F001N-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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