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Microchip Technology AT49F001-90TC
- Part No.:
- AT49F001-90TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49F001-90TC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F001-90TC from Microchip Technology (formerly Atmel) is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory IC with 90 ns read access time, sector-based architecture (16K boot block + two 8K parameter blocks + 96K main memory), and hardware data protection. It serves as nonvolatile program/data storage in embedded microcontroller systems requiring field-upgradable firmware.
For engineers reviewing the AT49F001-90TC datasheet, AT49F001-90TC pinout, AT49F001-90TC application, or AT49F001-90TC equivalent, key selection considerations include its 5V-only operation, boot block lockout capability, DATA polling/Toggle Bit erase/program status detection, 10,000 write cycles endurance, and TSOP-32 package compatibility with space-constrained PCB layouts.
Technical Context
The AT49F001-90TC implements a command-driven architecture using standard CE/OE/WE control lines and 6-byte software command sequences for chip erase, sector erase, byte programming, and boot block lockout. Its internal logic handles timing, voltage sensing, and erase verification without external clocks or high-voltage generators.
Memory organization is fixed: boot block at 1C000H–1FFFFH (16K bytes), parameter blocks at 1A000H–1BFFFH and 18000H–19FFFH (8K each), and main memory blocks at 10000H–17FFFH (32K) and 00000H–0FFFFH (64K). RESET pin supports both system reset and 12V override of boot block lockout - though this override is not available on the N(T) variant, it *is* supported on the AT49F001T and AT49F001NT variants per datasheet Section 3 and Note on page 5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8 bits); provides sufficient space for bootloader + configuration + application code in 8-bit embedded systems. |
| Read Access Time | 90 ns max; ensures compatibility with 11 MHz bus timing in legacy microcontrollers without wait-state insertion. |
| Operating Voltage | 5.0 V ±10%; eliminates need for dedicated programming voltage rails or level shifters in 5V systems. |
| Write Endurance | 10,000 program/erase cycles; supports long-term field firmware updates in industrial controllers and instrumentation. |
| Standby Current | 100 µA (CMOS mode); enables low-power retention during system sleep modes without external power gating. |
| Erase Time | 10 seconds (full chip); deterministic timing simplifies host firmware timeout handling during field upgrades. |
| Byte Programming Time | 10 µs typical (50 µs max); allows fine-grained patching of individual configuration registers or calibration data. |
Pinout & Package
AT49F001-90TC is housed in a 32-lead Plastic Thin Small Outline Package (TSOP, Type I, 8 × 20 mm), compliant with JEDEC MO-142 BD. Pin 1 is marked by a beveled corner; pins are numbered counterclockwise from top-left when viewed from the component side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A16 required to access upper 64K block (00000H–0FFFFH). |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with 8051, Z80, and 68K-family microcontrollers; supports true read/write multiplexing. |
| CE | Chip Enable | Active-low chip select; enables device decoding on shared buses; must be low with OE low and WE high for valid read output. |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during multi-device reads; high-Z when inactive. |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming; controls command entry timing. |
| RESET | Reset / Boot Override | Active-low reset halts operations and forces high-Z outputs; 12V input (±0.5V) disables boot block lockout for reprogramming. |
| VCC | Power Supply | +5V supply pin; internal voltage sensing inhibits programming if VCC < 3.8V (typical), preventing corruption during brown-out. |
| GND | Ground Reference | Signal and power ground reference; decoupling capacitor placement near this pin critical for noise immunity during programming. |
| NC | No Connect | Pin 9 in TSOP package is unconnected; must remain floating - no pull-up/down or routing permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | 16K boot block (1C000H–1FFFFH) can be permanently write-protected via command sequence, safeguarding bootloader integrity during field updates. |
| DATA Polling & Toggle Bit | I/O7 complement and I/O6 toggling provide real-time, software-readable status of ongoing program/erase cycles - no external polling timer needed. |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulse rejection), and control-line interlock (OE low / CE high / WE high) prevent accidental writes during power transients or noise events. |
| 5V-Only In-System Reprogramming | Eliminates requirement for 12V programming supplies or external high-voltage generators - simplifies BOM and board layout for upgrade-capable designs. |
| Software Product Identification | Manufacturer code (1FH) and device code (04H for AT49F001T family) readable via 3-cycle software command, enabling automatic algorithm selection in universal programmers. |
Applications
| Industrial PLC Firmware Storage | Automotive ECU Bootloader Memory |
|---|---|
Use Scenario: Storing firmware images and calibration tables in programmable logic controllers deployed in factory automation environments with ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped into microcontroller address space; accessed via standard 8-bit parallel bus with 90 ns timing compliance. Use Value: Sector erase enables selective update of I/O driver modules without disturbing core control logic; boot block lockout prevents corruption of safety-critical startup routines. |
Use Scenario: Holding bootloader code and vehicle-specific configuration data in engine control units operating across -40°C to +85°C temperature range. IC Role / Device Role / Timing Role: Primary boot memory accessed during power-on reset; supports in-vehicle reprogramming via CAN diagnostics using 5V-only command sequences. Use Value: 12V RESET override allows authorized service tools to re-enable boot block programming for recovery after failed update - critical for regulatory-compliant repair workflows. |
| Medical Device Configuration Storage | Networking Equipment Parameter Memory |
Use Scenario: Retaining user-adjustable operational parameters (e.g., alarm thresholds, sampling rates) in portable diagnostic instruments with battery-backed operation. IC Role / Device Role / Timing Role: Low-power configuration store; CMOS standby current (100 µA) minimizes battery drain during idle periods between measurements. Use Value: Byte-by-byte programming enables efficient storage of sparse parameter sets without erasing full sectors; DATA polling reduces firmware overhead during save operations. |
Use Scenario: Storing MAC addresses, port mappings, and firmware version metadata in Ethernet switches and routers undergoing remote firmware upgrades. IC Role / Device Role / Timing Role: Secondary nonvolatile memory co-located with main processor; accessed via memory-mapped I/O during boot and runtime configuration loading. Use Value: Two independent 8K parameter blocks allow A/B partitioning for atomic firmware updates - one block active while the other is rewritten, ensuring zero-downtime configuration changes. |
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 | 3V core with 5V I/O tolerance; 90 ns read; 1 Mbit; PLCC-32 only; no boot block lockout. | Lacks dedicated boot sector protection; requires external voltage translation in pure 5V systems. | Choose if migrating to lower-power 3V core design and external level shifting is acceptable. |
| SST39VF010-90-4C-NHE | 5V-only; 90 ns read; 1 Mbit; TSOP-32; single 16K boot sector but no lockout command - protection is hardware fuse-based. | Boot sector protection is permanent (blown fuse), not software-reversible; no 12V RESET override capability. | Choose if irreversible boot protection suffices and 12V recovery is not required for field service. |
Compared with AM29LV001MT-90EC and SST39VF010-90-4C-NHE, the AT49F001-90TC uniquely combines 5V-only operation, software-controllable boot lockout, and 12V-enabled recovery - making it optimal for cost-sensitive, field-upgradeable 5V embedded systems where bootloader integrity and serviceability are jointly critical.
Availability
AT49F001-90TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive ECU bootloader memory, medical device configuration storage, and networking equipment parameter memory requiring stable component supply across commercial temperature range (0°C to 70°C).
Supply support for AT49F001-90TC 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 legacy AT49F series Flash memories, including datasheets, application notes, and long-term supply commitments.
The AT49F001 product line was designed specifically for 5V embedded systems needing reliable, in-system reprogrammable nonvolatile storage with robust data protection - targeting industrial control, automotive subsystems, and medical instrumentation.
FAQ
What is the memory organization of the AT49F001-90TC?
The AT49F001-90TC contains 1 Mbit (131,072 × 8) of Flash memory organized into five sectors: one 16K-byte boot block (1C000H–1FFFFH), two 8K-byte parameter blocks (1A000H–1BFFFH and 18000H–19FFFH), and two main memory blocks (10000H–17FFFH = 32K, and 00000H–0FFFFH = 64K). This structure enables selective erasure and programming for modular firmware updates.
Does the AT49F001-90TC support boot block lockout, and how is it enabled?
Yes, the AT49F001-90TC supports boot block lockout. It is enabled via a six-cycle software command sequence: load AAH to 5555H, 55H to 2AAAH, 80H to 5555H, then AAH/55H/40H to 5555H/2AAAH/5555H. Once activated, the boot block (1C000H–1FFFFH) becomes permanently protected against erase and programming at ≤5.5V - though 12V applied to RESET restores reprogrammability.
What package type is used for the AT49F001-90TC, and what are its key mechanical dimensions?
The AT49F001-90TC uses a 32-lead Plastic Thin Small Outline Package (TSOP, Type I) measuring 8 mm × 20 mm. Per JEDEC MO-142 BD, it features a nominal body thickness of 1.27 mm, lead pitch of 0.5 mm, and pin 1 identifier at the top-left beveled corner. Pin 9 is NC and must remain unconnected.
How does the AT49F001-90TC indicate completion of a program or erase cycle?
The AT49F001-90TC provides two hardware-supported status methods: (1) DATA polling - reading the last programmed byte returns its complement on I/O7 until completion, then true data; (2) Toggle Bit - I/O6 toggles between 0 and 1 during operation and stabilizes upon completion. Both methods eliminate need for fixed delay timers in host firmware.
What is the maximum number of program/erase cycles guaranteed for the AT49F001-90TC?
The AT49F001-90TC is rated for a minimum of 10,000 program/erase cycles per memory location. This endurance specification applies across the full commercial temperature range (0°C to 70°C) and is validated per JEDEC standards - supporting multi-year field deployment with periodic firmware updates.
AT49F001-90TC 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:
- 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-TSOP
AT49F001-90TC FAQ
1.How can I place an order for AT49F001-90TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001-90TC 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 AT49F001-90TC reliable?
The price and inventory of AT49F001-90TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001-90TC is usually 5 days.
3.What payment methods are accepted for AT49F001-90TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001-90TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001-90TC?
AT49F001-90TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001-90TC 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 AT49F001-90TC?
For technical support, including AT49F001-90TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001-90TC requirements.
6.How does Aetrix verify that AT49F001-90TC is sourced from the original manufacturer or authorized distributors?
All AT49F001-90TC 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 AT49F001-90TC meets industry standards.
7.What is the process for return or replacement of AT49F001-90TC?
All AT49F001-90TC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001-90TC, 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 AT49F001-90TC part is unused and in its original packaging.
Return procedure for AT49F001-90TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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