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Microchip Technology AT49F001NT-55PC
- Part No.:
- AT49F001NT-55PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49F001NT-55PC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,241
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Product details
Overview
AT49F001NT-55PC 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 firmware boot applications. It delivers 55 ns read access time, 10 µs typical byte programming, 10-second chip erase, hardware data protection, and sector-based architecture with 16KB boot block lockout.
For engineers reviewing the AT49F001NT-55PC datasheet, AT49F001NT-55PC pinout, AT49F001NT-55PC application, or AT49F001NT-55PC equivalent, key selection considerations include its 32-pin PDIP package, 5V single-supply operation, boot-sector write protection, DATA polling/Toggle Bit end-of-program detection, and compatibility with standard microprocessor bus timing.
Technical Context
The AT49F001NT-55PC 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 16KB boot block (address range 1C000H–1FFFFH), two 8KB parameter blocks, and two main memory blocks (32KB and 64KB), enabling selective erasure without disturbing protected firmware.
It supports standard EPROM-like read operation (CE/OE/WE control), hardware reset-driven high-impedance output state, VCC sense (<3.8V inhibit), and noise-filtered WE/CE inputs (15 ns pulse rejection). The RESET pin is DC on this variant and does not support 12V override for boot block reprogramming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits |
| Read Access Time | 55 ns - enables direct execution from flash in 5 MHz microcontroller systems |
| Byte Programming Time | 10 µs typical - supports rapid field updates of small configuration data |
| Chip Erase Time | 10 seconds - deterministic internal timing eliminates external clock dependency |
| Write Endurance | 10,000 program/erase cycles - validated for firmware update and logging use cases |
| Power Dissipation | 275 mW active (50 mA @ 5V), 100 µA CMOS standby - suitable for low-power embedded designs |
| Operating Voltage | 5V ±10% - single-rail compatibility with legacy 5V logic and microcontrollers |
Pinout & Package
AT49F001NT-55PC uses a 32-lead, 0.600" wide plastic dual in-line package (PDIP), designated 32P6 per Microchip ordering nomenclature. Pin 1 is index corner, with NC (no connect) at pin 32 per datasheet specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing (A0–A16) |
| I/O0–I/O7 | Data Inputs/Outputs | 8-bit bidirectional data bus compatible with standard microprocessor data paths |
| 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 data output only when CE is also low |
| WE | Write Enable | Active-low write strobe; latches address/data during command and programming cycles |
| RESET | Reset Input | DC input (not 12V-capable); forces outputs to high-Z and halts ongoing operations |
| VCC | Power Supply | +5V supply pin; requires decoupling near device for stable read/write timing |
| GND | Ground | Signal and power reference; must be low-impedance connection for noise immunity |
| NC | No Connect | Pin 32 is unconnected - must remain floating, not tied to VCC/GND |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | Enables selective erasure of 8KB parameter blocks or 32/64KB main memory without affecting boot code |
| Boot Block Lockout | Hardware-enforced write protection for 16KB boot sector (1C000H–1FFFFH) after command sequence |
| DATA Polling & Toggle Bit | Real-time program/erase completion detection via I/O7 complement or I/O6 toggling - no timeout polling needed |
| Hardware Data Protection | VCC sense, noise filtering (15 ns), and control-line inhibition prevent accidental writes during power-up or noise events |
| 5V-Only Operation | Eliminates need for +12V programming voltage - simplifies system power design and reduces BOM cost |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Controller Boot Memory |
|---|---|
Use Scenario: Storing boot loader and firmware images in programmable logic controllers operating in harsh industrial environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing fast 55 ns read access to initialize CPU and load application code. Use Value: Sector architecture allows field updates to application firmware while preserving locked boot code integrity across 10,000+ cycles. | Use Scenario: Replacing UV-erasable EPROMs in aging 8/16-bit microcontroller systems requiring in-circuit reprogramming. IC Role / Device Role / Timing Role: Direct-drop-in 5V-compatible Flash memory with identical PDIP-32 footprint and EPROM-style read interface. Use Value: Eliminates UV eraser equipment and socket programming; enables field firmware patches via standard microprocessor bus writes. |
| Medical Device Configuration Storage | Automotive Diagnostic Module Code Storage |
Use Scenario: Holding calibrated sensor parameters and safety-critical configuration data in Class II medical instruments. IC Role / Device Role / Timing Role: Secure nonvolatile storage with hardware write protection preventing unintended modification of calibration tables. Use Value: Boot block lockout ensures factory-set calibration remains immutable during routine software updates to operational firmware. | Use Scenario: Storing diagnostic protocol stacks and vehicle-specific calibration maps in OBD-II compliant modules. IC Role / Device Role / Timing Role: High-reliability Flash memory supporting frequent reprogramming during dealer-level recalibration and recall campaigns. Use Value: 10-second chip erase and 10 µs byte programming enable rapid map updates without module removal or specialized programmers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F001N-55PC | Same 1 Mbit density, 55 ns speed, and PDIP-32 package; boot block address range is 00000H–03FFFH (lower memory map) | Used where boot code resides in lowest 16KB; incompatible if system expects boot sector at 1C000H–1FFFFH | Select AT49F001N-55PC only when legacy design requires bottom-addressed boot block. |
| SST39VF010-55-4C-NHE | 1 Mbit, 55 ns, PDIP-32, but uses different command set (SST proprietary) and lacks RESET pin; supports 3.3V/5V operation | Requires firmware adaptation for erase/program commands; no hardware reset control or boot lockout feature | Choose SST39VF010 only when dual-voltage flexibility is required and boot protection is managed in software. |
Compared with AT49F001N-55PC, the AT49F001NT-55PC places its protected boot sector in upper memory (1C000H–1FFFFH), enabling separation from application code; versus SST39VF010, it offers hardware-enforced boot lockout and dedicated RESET control-critical for safety-certified firmware architectures.
Availability
AT49F001NT-55PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded controller boot memory, medical device configuration storage, and automotive diagnostic module code storage requiring stable component supply over extended production lifecycles.
Supply support for AT49F001NT-55PC 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 series belongs to Atmel's 5V-only Flash memory product line, designed specifically for drop-in replacement of EPROMs in existing 5V microcontroller systems requiring in-system reprogrammability and hardware data protection.
FAQ
What is the boot block address range for AT49F001NT-55PC?
The AT49F001NT-55PC has its 16KB boot block located at address range 1C000H to 1FFFFH. This upper-memory placement distinguishes it from the AT49F001N variant (00000H–03FFFH) and enables separation of boot code from application firmware in larger memory maps. The boot block lockout feature, once enabled via command sequence, prevents reprogramming of this region at 5V.
Does AT49F001NT-55PC support 12V override for boot block reprogramming?
No, AT49F001NT-55PC does not support 12V override on the RESET pin for boot block reprogramming. The datasheet explicitly states that the RESET feature-including 12V override-is not available for the AT49F001N(T) variant. Once the boot block lockout is enabled on AT49F001NT-55PC, the sector is permanently protected under standard 5V operation.
What package type is used by AT49F001NT-55PC?
AT49F001NT-55PC uses a 32-lead, 0.600" wide plastic dual in-line package (PDIP), designated as 32P6 in Microchip's packaging nomenclature. Pin 32 is a no-connect (NC) terminal and must remain unconnected in PCB layout. This package provides through-hole mounting compatibility with legacy EPROM sockets.
How is end-of-program detection implemented in AT49F001NT-55PC?
AT49F001NT-55PC supports two hardware methods for end-of-program detection: DATA polling (reading the programmed byte returns its complement on I/O7 until completion) and Toggle Bit (I/O6 toggles between 0 and 1 during programming and stops upon completion). Both methods eliminate the need for fixed software timeouts and allow immediate initiation of the next memory access.
What is the maximum erase cycle time for AT49F001NT-55PC?
The maximum erase cycle time for AT49F001NT-55PC is 10 seconds for full chip erase. This value is guaranteed across commercial temperature range (0°C to 70°C) and represents the worst-case internal timer duration. Sector erase times are not individually specified but fall within the same 10-second bound due to internally controlled timing circuitry.
AT49F001NT-55PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-DIP (0.600", 15.24mm)
- 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:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT49F001NT-55PC FAQ
1.How can I place an order for AT49F001NT-55PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001NT-55PC 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-55PC reliable?
The price and inventory of AT49F001NT-55PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001NT-55PC is usually 5 days.
3.What payment methods are accepted for AT49F001NT-55PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001NT-55PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001NT-55PC?
AT49F001NT-55PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001NT-55PC 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-55PC?
For technical support, including AT49F001NT-55PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001NT-55PC requirements.
6.How does Aetrix verify that AT49F001NT-55PC is sourced from the original manufacturer or authorized distributors?
All AT49F001NT-55PC 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-55PC meets industry standards.
7.What is the process for return or replacement of AT49F001NT-55PC?
All AT49F001NT-55PC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001NT-55PC, 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-55PC part is unused and in its original packaging.
Return procedure for AT49F001NT-55PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F001NT-55PC Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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