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Microchip Technology AT49F001AT-55TI
- Part No.:
- AT49F001AT-55TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49F001AT-55TI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,279
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Product details
Overview
AT49F001AT-55TI from Atmel is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory IC with 55 ns read access time, 3-second chip erase cycle, 30 µs/byte programming, and sector-based architecture including a 16K-byte boot block at address 1C000H–1FFFFH. It operates across the industrial temperature range (−40°C to +85°C) and supports hardware data protection, DATA polling, and toggle-bit status detection for embedded firmware storage applications.
For engineers reviewing the AT49F001AT-55TI datasheet, AT49F001AT-55TI pinout, AT49F001AT-55TI application, or AT49F001AT-55TI equivalent, this device serves as a drop-in replacement for legacy EPROM-based boot code storage where 5V-only operation, sector-level erasure, and boot-block write lockout are required in industrial control, telecom line cards, and legacy BIOS modules.
Technical Context
The AT49F001AT-55TI implements a standard parallel Flash interface with CE/OE/WE control logic and internal command register sequencing for erase and program operations. Its memory array is partitioned into one 16K-byte boot block (1C000H–1FFFFH), two 8K-byte parameter blocks (1A000H–1BFFFH and 18000H–19FFFH), and two main memory blocks (10000H–17FFFH and 00000H–0FFFFH).
It features dual-status detection (DATA polling on I/O7 and toggle-bit on I/O6), hardware VCC sense (<3.8V inhibit), and RESET-pin-based boot-block override (12V pulse). The device requires no high-voltage programming supply and uses only 5V for all read, erase, and byte-program functions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - supports full firmware image storage for 8-bit microcontrollers. |
| Read Access Time | 55 ns max - enables direct execution from Flash (XIP) in systems with ≤18 MHz bus timing. |
| Chip Erase Time | 3 seconds typical - allows rapid field firmware updates without external erase equipment. |
| Byte Programming Time | 30 µs typical - supports efficient patching of configuration data or runtime variables. |
| Boot Block Size & Location | 16K bytes at 1C000H–1FFFFH - isolates secure bootloader code from user-modifiable application sectors. |
| Operating Voltage | 5.0 V ±10% - compatible with legacy 5V TTL/CMOS system buses without level-shifting. |
| Standby Current | 50 µA CMOS - reduces power in sleep modes of battery-backed or energy-sensitive systems. |
Pinout & Package
AT49F001AT-55TI is packaged in a 32-lead TSOP (Type I, 8 × 20 mm, package code 32T), compliant with JEDEC MO-142 Variation BD. Pin 1 is marked by a beveled corner; pin 9 is NC (no connect) per datasheet note.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A11–A16 are don't-care during command sequences. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; inhibits programming when high. |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention; must be high during programming/erase. |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming. |
| I/O0–I/O7 | Data Bus | Bidirectional 8-bit data path; carries command codes, product ID, and stored data; supports DATA polling on I/O7 and toggle-bit on I/O6. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; 12V pulse enables boot-block override (not available on AN variants). |
| VCC | Power Supply | +5.0 V supply; internal VCC sense disables programming if voltage drops below 3.8 V. |
| GND | Ground | Reference return for all signals and power; decoupling capacitor placement near this pin is critical for noise immunity. |
| NC | No Connect | Pin 9 is unconnected - must be left floating or tied to GND/VCC per board layout best practices; not usable as signal or power. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | Enables permanent protection of 16K-byte boot code (1C000H–1FFFFH) via software command; prevents accidental overwrite during field updates. |
| 5V-Only In-System Reprogrammability | Eliminates need for 12V programming supplies or external programmers - firmware updates performed directly via host MCU over parallel bus. |
| Hardware Data Protection | Combines VCC sensing (<3.8V inhibit), noise filtering (<15 ns pulse rejection), and control-line interlock (OE low / CE high / WE high blocks programming). |
| Dual Status Detection | DATA polling (I/O7 complement → true data) and toggle-bit (I/O6 toggling → completion) allow flexible, non-blocking end-of-operation detection. |
| RESET-Based Boot Override | Applying 12V ±0.5V to RESET pin temporarily disables boot-block lockout, enabling recovery of corrupted bootloader without device replacement. |
Applications
| Industrial PLC Firmware Storage | Telecom Line Card Configuration |
|---|---|
Use Scenario: Storing boot firmware and field-upgradable application code in programmable logic controllers with long service life requirements. IC Role / Device Role / Timing Role: Nonvolatile boot memory providing XIP-capable instruction fetch and sector-erased parameter updates without system reboot. Use Value: 10,000+ write cycles and 55 ns access ensure reliable operation over 10+ years in unattended deployments. |
Use Scenario: Holding protocol stacks and calibration data in T1/E1 line interface units requiring hot-swap compatibility and zero-downtime updates. IC Role / Device Role / Timing Role: Parallel Flash acting as configuration ROM with hardware write-protection for critical initialization routines. Use Value: Boot-block lockout prevents corruption of line synchronization firmware during remote parameter reprogramming. |
| Legacy PC BIOS Module | Embedded Network Router Bootloader |
Use Scenario: Replacing UV-erasable EPROMs in older motherboard BIOS designs where socketed upgradeability and 5V compatibility are mandatory. IC Role / Device Role / Timing Role: Drop-in Flash memory emulating EPROM timing (CE/OE/WE control) while adding in-circuit erase capability. Use Value: 45–55 ns access matches original EPROM specs; no PCB redesign needed beyond VCC decoupling adjustment. |
Use Scenario: Securing primary bootloader code in enterprise-grade routers where unauthorized modification must be physically prevented. IC Role / Device Role / Timing Role: Trusted boot memory with hardware-enforced write lock on boot sector and software-controlled erase of application partitions. Use Value: RESET-pin override enables emergency recovery while maintaining default protection against malware or misconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV001MT-55REI | 3.0 V core with 5V I/O tolerance; 55 ns access; 1 Mbit; boot-block architecture but no RESET-based override. | Requires level-shifting in pure 5V systems; lacks 12V boot-recovery feature. | Select when migrating to lower-power 3.3V domains or when RESET override is unnecessary. |
| SST39VF010-55-4C-NHE | 3.3 V only; 55 ns access; 1 Mbit; no boot-block lockout; uses different command set (SST-style). | Not pin-compatible; incompatible command sequences; no hardware boot protection. | Select only for new 3.3V designs where legacy 5V compatibility and boot security are not required. |
Compared with AM29LV001MT-55REI and SST39VF010-55-4C-NHE, the AT49F001AT-55TI uniquely delivers 5V-native operation, factory-verified boot-block lockout with 12V override, and full pin/command compatibility with EPROM sockets - making it the only viable option for maintaining legacy 5V firmware infrastructure with enhanced field update safety.
Availability
AT49F001AT-55TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, telecom line card configuration, legacy PC BIOS modules, and embedded network router bootloaders requiring stable component supply across extended product lifecycles.
Supply support for AT49F001AT-55TI 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, Flash memory, and secure authentication devices for industrial, automotive, and communications markets.
The AT49F001A(T) series was designed specifically to replace UV-erasable EPROMs in 5V systems, delivering in-system reprogrammability without external high-voltage supplies while preserving pinout and timing compatibility.
FAQ
What is the boot block address range for AT49F001AT-55TI?
The AT49F001AT-55TI has its 16K-byte boot block located at address range 1C000H to 1FFFFH. This differs from the base AT49F001A(N) variant (00000H–03FFFH) and is explicitly confirmed in the datasheet's sector address table and boot block lockout detection section. The AT49F001AT-55TI uses this upper-address boot block to isolate critical startup code from main application memory.
Does AT49F001AT-55TI support 12V RESET-based boot block override?
Yes, the AT49F001AT-55TI supports 12V ±0.5V applied to the RESET pin to temporarily disable boot block lockout, enabling chip erase or byte programming of the protected sector. This feature is explicitly documented in the "BOOT BLOCK PROGRAMMING LOCKOUT OVERRIDE" section and is unavailable on AT49F001AN(T) variants, confirming its presence in the AT49F001AT-55TI.
What package type is used for AT49F001AT-55TI?
The AT49F001AT-55TI uses a 32-lead Plastic Thin Small Outline Package (TSOP), Type I, 8 × 20 mm footprint (package code 32T), per the "AT49F001AT Ordering Information" table and mechanical drawing 32T. Pin 9 is designated NC (no connect), and the package complies with JEDEC MO-142 Variation BD.
How does DATA polling work on AT49F001AT-55TI?
During byte programming, reading the last programmed address returns the complement of the loaded data on I/O7; once programming completes, true data appears. This allows host firmware to poll I/O7 without blocking other operations. The AT49F001AT-55TI implements this per the "DATA POLLING" section, with tDH ≥10 ns hold time specified in the timing characteristics.
Is AT49F001AT-55TI pin-compatible with standard EPROMs like 27C010?
The AT49F001AT-55TI shares the same 32-pin parallel interface (A0–A16, I/O0–I/O7, CE/OE/WE, VCC/GND) and read timing behavior as 27C010 EPROMs, enabling socket-level replacement. However, it requires specific command sequences for erase/program and has NC on pin 9 - unlike 27C010 - so board-level verification of pin 9 handling is required for drop-in use.
AT49F001AT-55TI 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:
- 55 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
AT49F001AT-55TI FAQ
1.How can I place an order for AT49F001AT-55TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001AT-55TI 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 AT49F001AT-55TI reliable?
The price and inventory of AT49F001AT-55TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001AT-55TI is usually 5 days.
3.What payment methods are accepted for AT49F001AT-55TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001AT-55TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001AT-55TI?
AT49F001AT-55TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001AT-55TI 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 AT49F001AT-55TI?
For technical support, including AT49F001AT-55TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001AT-55TI requirements.
6.How does Aetrix verify that AT49F001AT-55TI is sourced from the original manufacturer or authorized distributors?
All AT49F001AT-55TI 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 AT49F001AT-55TI meets industry standards.
7.What is the process for return or replacement of AT49F001AT-55TI?
All AT49F001AT-55TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001AT-55TI, 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 AT49F001AT-55TI part is unused and in its original packaging.
Return procedure for AT49F001AT-55TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F001AT-55TI Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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