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Microchip Technology AT49F001T-90TC
- Part No.:
- AT49F001T-90TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49F001T-90TC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,947
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Product details
Overview
AT49F001T-90TC 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 architecture with a 16 KB boot block (address range 1C000H–1FFFFH) featuring programmable lockout.
For engineers reviewing the AT49F001T-90TC datasheet, AT49F001T-90TC pinout, AT49F001T-90TC application, or AT49F001T-90TC equivalent, this page delivers verified technical context, real-world use cases, pin-level design meaning, and validated alternative options - all grounded in the official AT49F001(N)(T) Rev. 1008D datasheet and Microchip's ordering documentation.
Technical Context
The AT49F001T-90TC implements a command-based Flash architecture requiring six-byte software sequences for chip/sector erase and boot lockout enable. Its internal program control logic handles timing autonomously, eliminating external clocks during erase (tEC = 10 s) and byte programming (tBP = 10–50 µs).
It supports DATA polling (I/O7 complement) and toggle-bit (I/O6) methods for cycle completion detection, and integrates VCC sense, noise filtering (<15 ns pulse rejection), and three-line control (CE/OE/WE) to prevent bus contention - matching EPROM read behavior while enabling in-system reprogramming at 5V only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - sufficient for firmware boot code and parameter storage in 8-bit/16-bit MCU systems. |
| Read Access Time | 90 ns maximum - compatible with 11 MHz bus timing in legacy microcontrollers without wait-state insertion. |
| Byte Programming Time | 10 µs typical (50 µs max) - enables rapid field updates of small configuration blocks without system interruption. |
| Erase Cycle Time | 10 seconds for full chip erase - deterministic internal timing eliminates need for external timers or status polling overhead. |
| Boot Block Size & Address | 16 KB (1C000H–1FFFFH) - physically isolated sector for secure bootloader storage, protected via command-activated lockout. |
| Operating Voltage | 5.0 V ±10% - single-supply operation simplifies power design; no 12 V or VPP required for programming. |
| Endurance | 10,000 write/erase cycles - validated for industrial firmware update cycles over product lifetime. |
| Standby Current | 100 µA (CMOS, commercial temp) - enables low-power retention in battery-backed or sleep-mode applications. |
Pinout & Package
AT49F001T-90TC is supplied in a 32-lead Plastic Thin Small Outline Package (TSOP), Type I, 8 mm × 20 mm footprint (JEDEC MO-142 BD), with gull-wing leads and pin 1 marked by notch or bevel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A16 selects upper 64K block (10000H–1FFFFH) where boot block resides. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; supports true read (OE/CE active), byte programming (WE-controlled), and DATA polling (I/O7 complement). |
| CE | Chip Enable | Active-low chip select; when high, forces outputs to high-impedance - essential for multi-device bus arbitration. |
| OE | Output Enable | Active-low output gate; used with CE to implement standard EPROM read timing and avoid bus contention. |
| WE | Write Enable | Active-low control for programming/erase commands; latches address/data on falling/rising edges per command sequence protocol. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and tri-states outputs; 12 V override enables boot block reprogramming after lockout. |
| VCC | Power Supply | +5.0 V ±10% supply; powers core logic and charge pumps; VCC sense disables programming if below 3.8 V. |
| 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 - must remain unconnected; routing to GND/VCC or signal traces violates device specification. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | Enables secure bootloader storage in 16 KB boot block (1C000H–1FFFFH); lockout prevents accidental overwrite while allowing main memory updates. |
| Hardware Data Protection | VCC sense, WE/CE noise filtering (<15 ns), and three-line inhibit (OE low / CE high / WE high) eliminate spurious writes in electrically noisy environments. |
| DATA Polling & Toggle Bit | Real-time cycle completion detection via I/O7 complement or I/O6 toggling - removes need for fixed delays or external status registers. |
| 5V-Only Reprogrammability | Eliminates requirement for +12 V programming voltage; simplifies system power design and enables in-circuit updates using standard MCU GPIOs. |
| Industrial Temperature Range | -40°C to +85°C operation (industrial grade suffix 'I' variant available) - suitable for automotive body control, industrial HMI, and outdoor equipment. |
| Low Power Standby | 100 µA CMOS standby current - extends battery life in portable diagnostics tools and remote sensor nodes with infrequent firmware updates. |
Applications
| Embedded Bootloader Storage | Firmware Configuration Storage |
|---|---|
|
Use Scenario: Storing immutable bootloader code in a microcontroller-based motor drive that must recover from corrupted application firmware. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to CPU reset vector; accessed within first 90 ns of power-on or reset assertion. Use Value: Boot block lockout ensures bootloader integrity across 10,000+ field updates to application code stored in main memory blocks. |
Use Scenario: Retaining calibrated sensor offsets and user preferences in an industrial temperature controller with no backup battery. IC Role / Device Role / Timing Role: Parameter storage device; written during calibration or setup, read at startup; erased/reprogrammed per maintenance cycle. Use Value: Two dedicated 8 KB parameter blocks allow atomic updates without disturbing boot or application code, reducing risk of corruption. |
| Legacy System Code Replacement | Field-Upgradeable HMI Firmware |
|
Use Scenario: Replacing obsolete EPROMs in aging telecom line cards requiring field firmware patches without board replacement. IC Role / Device Role / Timing Role: Pin-compatible Flash drop-in replacement for 27C010 EPROM; uses identical CE/OE/WE timing and 5 V supply. Use Value: 90 ns access time meets original EPROM spec; in-system reprogrammability avoids costly return-to-factory servicing. |
Use Scenario: Enabling over-the-air (OTA) UI firmware updates in a medical infusion pump display module. IC Role / Device Role / Timing Role: Secondary code storage; updated via UART-connected MCU; boot block holds recovery loader, main blocks hold UI assets. Use Value: Sector erase allows partial updates (e.g., language pack only) without erasing safety-critical bootloader or calibration data. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002T-90TC | 2 Mbit (256K × 8) capacity; same 90 ns access, TSOP-32 package, and command set; boot block address shifted to 3C000H–3FFFFH. | Requires address bus expansion to A18; suitable when >1 Mbit code space needed without changing PCB layout. | Select when future firmware growth is anticipated; pinout and timing are identical, but memory map differs. |
| SST39VF010-90-4C-NHE | 1 Mbit, 90 ns, 3.3 V core (5 V tolerant I/O); different command set (single-byte unlock); no RESET pin or 12 V override. | Lacks boot block lockout override; requires 3.3 V supply; not drop-in for 5 V-only systems. | Choose for lower-power 3.3 V designs where 5 V tolerance suffices; verify command compatibility before migration. |
Compared with AT49F002T-90TC, the AT49F001T-90TC offers tighter fit for constrained code size and retains 12 V RESET override for emergency boot block recovery; versus SST39VF010, it guarantees 5 V-only operation and integrated hardware lockout - critical for legacy industrial controllers.
Availability
AT49F001T-90TC is available at Aetrix Electronics and suitable for embedded bootloader storage, firmware configuration retention, and legacy EPROM replacement requiring stable component supply and long-term industrial availability.
Supply support for AT49F001T-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 AT49F001 family, including datasheets, errata, and legacy product change notifications.
The AT49F001 series was designed for cost-sensitive, 5 V-based embedded systems needing reliable in-system reprogrammability - especially where bootloader security and industrial temperature operation are mandatory.
FAQ
What is the boot block address range for AT49F001T-90TC?
The boot block for AT49F001T-90TC occupies addresses 1C000H to 1FFFFH (16 KB). This differs from the base AT49F001(N) version (00000H–03FFFH) and is explicitly defined in the datasheet's "Notes" section and sector erase table. The AT49F001T-90TC uses this upper-address boot block to isolate critical startup code from main memory updates.
Does AT49F001T-90TC support 12 V programming voltage?
No - AT49F001T-90TC is strictly 5 V-only for all operations, including programming and erasure. However, applying 12.0 V ±0.5 V to the RESET pin (not VCC) enables override of the boot block programming lockout, permitting reprogramming of the protected sector. This is a dedicated hardware feature, not a general programming voltage mode.
Can AT49F001T-90TC be used as a direct replacement for AT29C010A-90JC?
AT49F001T-90TC is not a pin-compatible or functional drop-in for AT29C010A-90JC. While both are 1 Mbit 5 V Flash devices, they differ in command sequences, boot block location, RESET functionality, and timing parameters. Migration requires validation of read/write/erase command flow, address mapping, and hardware protection logic - especially for boot block usage.
What is the purpose of the NC pin on AT49F001T-90TC?
Pin 9 on the AT49F001T-90TC TSOP package is designated NC (No Connect) and must remain unconnected. Per the datasheet, connecting it to VCC, GND, or any signal violates specifications and may cause undefined behavior. This pin is unused in the internal die bonding and has no electrical function - routing traces to it is prohibited.
How does DATA polling work on AT49F001T-90TC during byte programming?
During byte programming, reading the just-loaded address returns the complement of the programmed data on I/O7 until completion. Once programming finishes, true data appears on all I/O lines. This allows the host MCU to poll I/O7 without fixed delays - for example, reading address 1C000H repeatedly until I/O7 transitions from complement to true value confirms completion of that byte's programming in AT49F001T-90TC.
AT49F001T-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
AT49F001T-90TC FAQ
1.How can I place an order for AT49F001T-90TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001T-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 AT49F001T-90TC reliable?
The price and inventory of AT49F001T-90TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001T-90TC is usually 5 days.
3.What payment methods are accepted for AT49F001T-90TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001T-90TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001T-90TC?
AT49F001T-90TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001T-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 AT49F001T-90TC?
For technical support, including AT49F001T-90TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001T-90TC requirements.
6.How does Aetrix verify that AT49F001T-90TC is sourced from the original manufacturer or authorized distributors?
All AT49F001T-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 AT49F001T-90TC meets industry standards.
7.What is the process for return or replacement of AT49F001T-90TC?
All AT49F001T-90TC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001T-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 AT49F001T-90TC part is unused and in its original packaging.
Return procedure for AT49F001T-90TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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