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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Microchip Technology AT49F001T-90TI

Name: AT49F001T-90TI
Brand: Microchip Technology
SKU: AT49F001T-90TI
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AT49F001T-90TI

Manufacturer:: Microchip Technology

Category:: Memory

Package:: 32-TFSOP (0.724", 18.40mm Width)

Datasheet:: AT49F001T-90TI.pdf

Description:: IC FLASH 1MBIT PARALLEL 32TSOP

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Product details

Overview

AT49F001T-90TI 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 industrial temperature range (−40°C to +85°C) and supports standard microprocessor bus interfacing via CE/OE/WE control.

For engineers reviewing the AT49F001T-90TI datasheet, AT49F001T-90TI pinout, AT49F001T-90TI application, or AT49F001T-90TI equivalent, key selection considerations include its 5V-only operation without high-voltage programming, hardware data protection (VCC sense, noise filtering), DATA polling and toggle-bit end-of-program detection, and boot-block lockout override via 12V RESET input - critical for secure firmware storage in embedded controllers and BIOS modules.

Technical Context

The AT49F001T-90TI implements a sector-erasable Flash architecture with four distinct memory regions: one 16 KB boot block (address 1C000H–1FFFFH), two 8 KB parameter blocks (1A000H–1BFFFH and 18000H–19FFFH), and two main memory blocks (10000H–17FFFH and 00000H–0FFFFH). Its command-set-driven operation uses six-byte sequences for chip/sector erase and boot lockout enable.

It features dual-mode program detection (DATA polling on I/O7 and toggle-bit on I/O6), hardware safeguards against spurious writes (VCC < 3.8 V inhibition, OE/CE/WE state locking), and RESET-pin-based boot-block reprogramming override at 12 V ± 0.5 V - a capability absent in the AT49F001N(T) variant.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Density	1 Mbit (131,072 × 8), organized as 128K words × 8 bits - sufficient for BIOS, boot code, and configuration data in resource-constrained systems.
Read Access Time	90 ns max - enables direct replacement of EPROMs in legacy 8-bit microcontroller systems without timing redesign.
Byte Programming Time	10 µs typical (50 µs max) - allows rapid field updates of small firmware patches without system downtime.
Erase Cycle Time	10 seconds max for full chip or sector erase - supports in-system reconfiguration during maintenance windows.
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 region (1C000H–1FFFFH) with lockout enabled via 6-byte command sequence; override possible via 12 V on RESET - ensures bootloader integrity while permitting field updates to application code.
Operating Voltage	5 V ± 10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for programming.
Temperature Range	Industrial: −40°C to +85°C - validated for use in automotive ECUs, industrial PLCs, and telecom line cards.

Pinout & Package

AT49F001T-90TI is supplied in a 32-lead TSOP (Type I, 8 × 20 mm, package code 32T), compliant with JEDEC MO-142 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; A0 least significant bit.
I/O0–I/O7	Data Inputs/Outputs	Bi-directional 8-bit data bus; supports byte-wide reads/writes and status polling on I/O6/I/O7.
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 gate; controls data bus tristate; used with CE for bus contention avoidance.
WE	Write Enable	Active-low write strobe; latches address/data during command sequences and byte programming.
RESET	Reset Input	Active-low reset; halts ongoing operations and forces high-Z outputs; 12 V input enables boot-block override.
VCC	Power Supply	+5 V ± 10% supply; powers core logic and memory array; VCC sense prevents programming below 3.8 V.
GND	Ground	Reference return path for all signals and power; decoupling capacitor placement critical near this pin.
NC	No Connect	Pin 9 in TSOP package - must remain unconnected; floating or driven states may cause malfunction.

Key Features

Feature	Design Value
Single 5V Supply Operation	Eliminates need for +12 V or +21 V programming voltages - simplifies power design and enables true in-system reprogramming via standard logic rails.
Sector Architecture with Boot Lockout	Enables independent erasure of parameter blocks (8 KB each) and main memory (32 KB / 64 KB), while protecting bootloader code in 16 KB boot block - essential for fail-safe firmware upgrades.
Hardware Data Protection	VCC sense (<3.8 V inhibits write), noise filtering (<15 ns pulse rejection), and control-line interlock (OE low / CE high / WE high blocks programming) - prevents accidental corruption during power transients or EMI events.
Two End-of-Operation Detection Methods	DATA polling (I/O7 complement) and toggle-bit (I/O6 toggling) provide redundant, software-controllable confirmation of program/erase completion - improves host firmware robustness and reduces worst-case timing margins.
12 V RESET Override for Boot Block	Allows recovery of locked boot code using external 12 V ± 0.5 V pulse on RESET pin - unique to AT49F001T/AT49F001NT variants and critical for factory reflash or security recovery workflows.
10,000 Program/Erase Cycles	Guaranteed endurance supports long-term field deployment in applications requiring periodic firmware updates over 5+ year product lifecycles.

Applications

Embedded Controller Boot Memory	Industrial PLC Configuration Storage
Use Scenario: Storing boot loader and initial firmware for 8-bit/16-bit microcontrollers in factory automation equipment. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to CPU reset vector; accessed during power-on initialization with 90 ns read latency. Use Value: Boot block lockout ensures bootloader remains intact during field updates to application firmware stored in main memory blocks.	Use Scenario: Retaining calibrated sensor parameters, I/O mapping tables, and safety logic configurations in programmable logic controllers. IC Role / Device Role / Timing Role: Parameter block storage (two 8 KB sectors) accessed during startup or maintenance mode; erased/reprogrammed independently of main firmware. Use Value: Sector-erasable architecture enables fast, targeted updates without risking corruption of operational firmware or bootloader.
Legacy BIOS Replacement	Telecom Line Card Firmware
Use Scenario: Replacing UV-erasable EPROMs in PC motherboard BIOS chips where board space and voltage constraints prohibit multi-rail solutions. IC Role / Device Role / Timing Role: Drop-in EPROM-compatible Flash memory with identical CE/OE/WE interface and 90 ns access - requires no PCB redesign. Use Value: Eliminates need for UV erasers and socket programming; enables in-field BIOS patching via standard ISA/PCI host interface.	Use Scenario: Storing protocol stacks and DSP configuration data in carrier-grade telecom line cards operating in extended temperature environments. IC Role / Device Role / Timing Role: Industrial-grade (−40°C to +85°C) nonvolatile memory interfaced to FPGA or DSP host; programmed via JTAG or dedicated MCU. Use Value: 10,000-cycle endurance and hardware write protection ensure reliability across decades of service with minimal field failures.

Embedded Controller Boot Memory

Industrial PLC Configuration Storage

Use Scenario: Storing boot loader and initial firmware for 8-bit/16-bit microcontrollers in factory automation equipment.

IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to CPU reset vector; accessed during power-on initialization with 90 ns read latency.

Use Value: Boot block lockout ensures bootloader remains intact during field updates to application firmware stored in main memory blocks.

Use Scenario: Retaining calibrated sensor parameters, I/O mapping tables, and safety logic configurations in programmable logic controllers.

IC Role / Device Role / Timing Role: Parameter block storage (two 8 KB sectors) accessed during startup or maintenance mode; erased/reprogrammed independently of main firmware.

Use Value: Sector-erasable architecture enables fast, targeted updates without risking corruption of operational firmware or bootloader.

Legacy BIOS Replacement

Telecom Line Card Firmware

Use Scenario: Replacing UV-erasable EPROMs in PC motherboard BIOS chips where board space and voltage constraints prohibit multi-rail solutions.

IC Role / Device Role / Timing Role: Drop-in EPROM-compatible Flash memory with identical CE/OE/WE interface and 90 ns access - requires no PCB redesign.

Use Value: Eliminates need for UV erasers and socket programming; enables in-field BIOS patching via standard ISA/PCI host interface.

Use Scenario: Storing protocol stacks and DSP configuration data in carrier-grade telecom line cards operating in extended temperature environments.

IC Role / Device Role / Timing Role: Industrial-grade (−40°C to +85°C) nonvolatile memory interfaced to FPGA or DSP host; programmed via JTAG or dedicated MCU.

Use Value: 10,000-cycle endurance and hardware write protection ensure reliability across decades of service with minimal field failures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Flash memory applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT49F001T-90JI	Same die and feature set; differs only in PLCC (32J) package instead of TSOP (32T); pin 1 identifier and thermal profile differ.	Preferred for through-hole prototyping or legacy board designs with PLCC footprints; less suitable for high-density surface-mount assemblies.	Select AT49F001T-90JI only when PLCC mechanical compatibility or hand-soldering requirements outweigh TSOP's space savings.
SST39VF010-90-4C-NHE	4 Mbit density (512K × 8), 90 ns access, 3.3 V core (with 5 V tolerant I/O); lacks boot block lockout and 12 V RESET override.	Targets newer 3.3 V systems; not drop-in compatible due to voltage and protection feature mismatch.	Choose SST39VF010 only when migrating to lower-voltage platforms and boot-block security is managed externally via software or companion logic.

Compared with AT49F001T-90JI, the AT49F001T-90TI offers superior board-level density and thermal performance in surface-mount layouts; compared with SST39VF010-90-4C-NHE, it provides guaranteed 5 V operation and hardware-enforced boot integrity - making it irreplaceable in legacy industrial and telecom designs requiring field-upgradable, tamper-resistant firmware storage.

Availability

AT49F001T-90TI is available at Aetrix Electronics and suitable for industrial control systems, telecom infrastructure equipment, and embedded controller boot memory applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature operation.

Supply support for AT49F001T-90TI 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 technical and manufacturing continuity for the AT49F001 family. The company specializes in microcontrollers, analog, and nonvolatile memory solutions for industrial, automotive, and communications markets.

The AT49F001T series belongs to Atmel's legacy parallel-interface Flash memory product line, designed specifically for seamless EPROM replacement and secure in-system firmware update in cost-sensitive, temperature-extended embedded systems.

FAQ

What is the function of the RESET pin on the AT49F001T-90TI?

The RESET pin on the AT49F001T-90TI serves dual functions: as an active-low reset signal that halts ongoing operations and places outputs in high-impedance state, and - uniquely - as a 12 V ± 0.5 V override input to reprogram the locked boot block. This override capability is exclusive to the AT49F001T and AT49F001NT variants and is not present in AT49F001N(T) devices. The AT49F001T-90TI's RESET pin must be held at TTL high (≥2.0 V) during normal operation to avoid unintended resets.

How does the boot block lockout feature work on the AT49F001T-90TI?

The AT49F001T-90TI's boot block lockout protects the 16 KB region at addresses 1C000H–1FFFFH from accidental erasure or programming once enabled. Activation requires a precise six-byte command sequence (5555H/AAH, 2AAAH/55H, 5555H/80H, 5555H/AAH, 2AAAH/55H, 5555H/40H). Once enabled, writes to this region are blocked at ≤5.5 V; only a 12 V pulse on RESET can temporarily disable protection. The AT49F001T-90TI's lockout status is readable at address 1C002H via software product identification mode.

Can the AT49F001T-90TI be used as a direct replacement for EPROMs like the 27C010?

Yes, the AT49F001T-90TI is pin- and function-compatible with 27C010 EPROMs in read mode: same 32-pin TSOP footprint, identical CE/OE/WE control logic, and 90 ns access time meets or exceeds 27C010-120 timing. However, unlike EPROMs, the AT49F001T-90TI requires no UV erasure and supports in-system reprogramming via standard 5 V signals - eliminating the need for UV erasers or device programmers in the field. Its write cycle timing and command protocol differ, so host firmware must implement Flash-specific algorithms.

What are the valid sector erase address ranges for the AT49F001T-90TI?

The AT49F001T-90TI supports sector erase at four distinct address ranges: Parameter Block 1 (1A000H–1BFFFH), Parameter Block 2 (18000H–19FFFH), Main Memory Block 1 (10000H–17FFFH), and Main Memory Block 2 (00000H–0FFFFH). The boot block (1C000H–1FFFFH) cannot be sector-erased when lockout is enabled. Sector erase is initiated using the six-cycle command sequence with sector address latched on the sixth WE falling edge and data 30H latched on the sixth WE rising edge - a timing-critical operation defined in the AT49F001T-90TI datasheet AC waveforms.

Does the AT49F001T-90TI support both DATA polling and toggle-bit detection?

Yes, the AT49F001T-90TI supports both DATA polling and toggle-bit detection for end-of-program and end-of-erase verification. DATA polling monitors I/O7: during programming, it returns the complement of loaded data; upon completion, true data appears. Toggle-bit detection monitors I/O6: it toggles between 0 and 1 during active cycles and stabilizes upon completion. Both methods are usable concurrently or independently, providing host firmware with flexible, reliable status feedback without fixed timing delays - a key reliability feature confirmed in the AT49F001T-90TI's AC characteristics table.

AT49F001T-90TI 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:: -40°C ~ 85°C (TC)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 32-TSOP

AT49F001T-90TI FAQ

1.How can I place an order for AT49F001T-90TI through Aetrix?

Please submit a Request for Quotation (RFQ) for AT49F001T-90TI 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-90TI reliable?

The price and inventory of AT49F001T-90TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001T-90TI is usually 5 days.

3.What payment methods are accepted for AT49F001T-90TI?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001T-90TI transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AT49F001T-90TI?

AT49F001T-90TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AT49F001T-90TI 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-90TI?

For technical support, including AT49F001T-90TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001T-90TI requirements.

6.How does Aetrix verify that AT49F001T-90TI is sourced from the original manufacturer or authorized distributors?

All AT49F001T-90TI 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-90TI meets industry standards.

7.What is the process for return or replacement of AT49F001T-90TI?

All AT49F001T-90TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001T-90TI, 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-90TI part is unused and in its original packaging.

Return procedure for AT49F001T-90TI:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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