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Microchip Technology AT49F001T-90VC
- Part No.:
- AT49F001T-90VC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49F001T-90VC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,045
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Product details
Overview
AT49F001T-90VC 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, 10 µs/byte typical programming time, and sector-based erase architecture including a 16 KB boot block with programmable lockout. It operates across commercial temperature range (0°C to 70°C) and is used in embedded firmware storage for industrial controllers and legacy BIOS modules.
For engineers reviewing the AT49F001T-90VC datasheet, AT49F001T-90VC pinout, AT49F001T-90VC application, or AT49F001T-90VC equivalent, key selection considerations include its VSOP-32 package, 5V single-supply operation, boot block protection capability, DATA polling/Toggle Bit end-of-program detection, and compatibility with standard microprocessor bus timing.
Technical Context
The AT49F001T-90VC implements a command-based Flash architecture requiring six-byte software sequences for chip/sector erase and boot lockout enable. Its memory is partitioned into one 16 KB boot block (address range 1C000H–1FFFFH), 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 standard EPROM-like read operation via CE/OE/WE control lines, hardware data protection via VCC sense (<3.8 V inhibits programming), noise filtering on WE/CE inputs, and RESET-driven boot block override at 12 V. Programming and erase cycles are internally timed, eliminating external clock requirements.
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/16-bit microcontrollers. |
| Read Access Time | 90 ns max - meets timing requirements for 11 MHz bus systems with adequate setup/hold margins. |
| Byte Programming Time | 10 µs typical (50 µs max) - enables rapid field updates of small configuration or calibration data segments. |
| Erase Cycle Time | 10 seconds max for full chip or sector - allows predictable maintenance windows during in-system reprogramming. |
| End-of-Program Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delay timers in host firmware. |
| Boot Block Protection | 16 KB (1C000H–1FFFFH) with lockout enabled via 6-cycle command sequence - prevents accidental overwrite of critical startup code. |
| Power Dissipation | 50 mA active current, 100 µA CMOS standby current - suitable for low-power embedded systems with intermittent firmware access. |
| Endurance | 10,000 program/erase cycles - validated for long-term use in industrial logging or configuration storage applications. |
Pinout & Package
AT49F001T-90VC is housed in a 32-lead Plastic Thin Small Outline Package (VSOP), 8 mm × 14 mm body, JEDEC-compliant, with gull-wing leads and pin 1 identifier marked on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A16 required for accessing upper 64 KB block (00000H–0FFFFH). |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with standard microprocessor data buses; supports byte-wide reads and writes. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; dual-line control prevents bus contention. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high, enabling shared bus operation. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command cycle timing; inhibits programming if held high. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; 12 V input overrides boot block lockout (not available on N(T) variants). |
| VCC | Power Supply | +5.0 V ±10% supply; internal VCC sense disables programming below ~3.8 V for robustness against brown-out conditions. |
| GND | Ground Reference | Signal and power ground reference for all I/O and internal logic; decoupling capacitor placement critical near this pin. |
| NC | No Connect | Pin 32 in VSOP package - must remain unconnected; no internal connection or function. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for +12 V or +25 V programming voltages, simplifying power design and enabling direct connection to 5 V microcontroller buses. |
| Sector Erase Architecture | Enables granular updates: 8 KB parameter blocks can be erased independently, while main memory blocks support alternating firmware storage schemes. |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulses rejected), and control-line inhibition (OE low/CE high/WE high) prevent spurious writes during power transients or EMI events. |
| Boot Block Lockout Override | 12 V applied to RESET pin temporarily disables boot block protection, allowing recovery of corrupted secure code without device replacement. |
| CMOS Standby Current | 100 µA maximum at 0°C–70°C enables battery-backed operation in sleep modes for extended periods without significant drain. |
| Software Product Identification | Manufacturer code (1FH) and device code (04H) readable via 3-cycle software command - enables automatic algorithm selection in universal programmers. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Modules |
|---|---|
Use Scenario: Storing boot firmware and runtime configuration in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with sector-level update capability and hardware write protection for safety-critical boot code. Use Value: Enables field-upgradable ladder logic and I/O mapping without replacing the entire controller board; boot block lockout ensures certified startup routines remain intact. |
Use Scenario: Replacing obsolete EPROMs in desktop motherboard BIOS chips where space-constrained VSOP packaging is required. IC Role / Device Role / Timing Role: Drop-in Flash memory providing 90 ns read access compatible with ISA bus timing and legacy chipset address decoding. Use Value: Eliminates UV-erasable EPROM sockets and programming fixtures; supports in-circuit reflash via standard ISA programmer interfaces. |
| Embedded Instrument Calibration Storage | Telecom Line Card Configuration |
Use Scenario: Holding calibrated sensor offset/gain coefficients and user-defined measurement profiles in portable test equipment. IC Role / Device Role / Timing Role: Parameter block storage with independent 8 KB erase capability for fast coefficient updates without disturbing main application code. Use Value: Allows recalibration in the field using handheld tools; DATA polling ensures deterministic write completion for traceable metrology records. |
Use Scenario: Storing protocol stack configuration, port mapping, and feature enable bits in carrier-grade DSLAM line cards. IC Role / Device Role / Timing Role: In-system reprogrammable configuration store accessed during card initialization and hot-swap events. Use Value: Supports remote firmware patching over management interfaces; Toggle Bit detection simplifies host driver implementation for asynchronous flash operations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002T-90VC | 2 Mbit density (256K × 8), same 90 ns access, identical VSOP-32 package and command set. | Supports larger firmware images; requires updated address decoding for A17. | Select when future firmware growth headroom is needed; pin-compatible and software-compatible upgrade path. |
| SST39VF010-90-4C-NHE | 1 Mbit, 90 ns, 3.3 V core (5 V tolerant I/O), TSOP-32 package, different command set (SST-style). | Lower active power (25 mA), but requires level-shifting or mixed-voltage design; no RESET-based boot override. | Choose for lower power or 3.3 V system integration; not drop-in due to command and voltage differences. |
Compared with AT49F001T-90VC, AT49F002T-90VC offers double capacity with identical timing and footprint, while SST39VF010 demands voltage adaptation and firmware rework but reduces active current by half - making the former ideal for seamless scalability and the latter for power-sensitive 3.3 V designs.
Availability
AT49F001T-90VC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy BIOS replacement, embedded calibration storage, and telecom line card configuration requiring stable component supply and long-term obsolescence support.
Supply support for AT49F001T-90VC 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 datasheets, application notes, and programming tools.
The AT49F001T-90VC belongs to Atmel's 5V Flash memory product line, designed specifically for cost-sensitive, pin-compatible EPROM replacements in industrial and computing applications requiring in-system reprogrammability without high-voltage programming infrastructure.
FAQ
What is the boot block address range for AT49F001T-90VC?
The boot block for AT49F001T-90VC occupies address range 1C000H to 1FFFFH (16 KB). This differs from the base AT49F001(N) variant, which locates the boot block at 00000H–03FFFH. The relocated boot block enables flexible memory mapping for systems requiring upper-memory firmware execution.
Does AT49F001T-90VC support 3.3 V operation?
No, AT49F001T-90VC is a 5 V-only device requiring VCC = 5.0 V ±10%. It does not support 3.3 V core operation. Attempting to power it at 3.3 V will inhibit programming and may result in unreliable read behavior due to insufficient VCC sense threshold margin.
How is boot block lockout enabled on AT49F001T-90VC?
Boot block lockout is enabled via a six-cycle command sequence: load AAH to 5555H, 55H to 2AAAH, 80H to 5555H, AAH to 5555H, 55H to 2AAAH, then 40H to 5555H. Once activated, the boot block (1C000H–1FFFFH) becomes permanently protected against erase or program at ≤5.5 V.
Can AT49F001T-90VC be programmed using standard EPROM programmers?
No - AT49F001T-90VC requires command-based programming via its CE/OE/WE interface and cannot be programmed in conventional EPROM programmers. It must be programmed in-system or using dedicated Flash programmers that implement the Atmel command protocol and support 5 V-only signaling.
What is the purpose of the NC pin on AT49F001T-90VC?
Pin 32 on the AT49F001T-90VC VSOP package is designated NC (No Connect) and has no internal connection. It must remain unconnected in PCB layout; routing or soldering to this pin may cause mechanical stress or unintended coupling without functional benefit.
AT49F001T-90VC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.488", 12.40mm 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-VSOP
AT49F001T-90VC FAQ
1.How can I place an order for AT49F001T-90VC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001T-90VC 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-90VC reliable?
The price and inventory of AT49F001T-90VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001T-90VC is usually 5 days.
3.What payment methods are accepted for AT49F001T-90VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001T-90VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001T-90VC?
AT49F001T-90VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001T-90VC 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-90VC?
For technical support, including AT49F001T-90VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001T-90VC requirements.
6.How does Aetrix verify that AT49F001T-90VC is sourced from the original manufacturer or authorized distributors?
All AT49F001T-90VC 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-90VC meets industry standards.
7.What is the process for return or replacement of AT49F001T-90VC?
All AT49F001T-90VC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001T-90VC, 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-90VC part is unused and in its original packaging.
Return procedure for AT49F001T-90VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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