My Inquiry
My Account
Microchip Technology AT49F001T-90JC
- Part No.:
- AT49F001T-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001T-90JC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,383
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT49F001T-90JC 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 microcontroller-based systems requiring field-upgradable code.
For engineers reviewing the AT49F001T-90JC datasheet, AT49F001T-90JC pinout, AT49F001T-90JC application, or AT49F001T-90JC equivalent, this page delivers verified technical context, package-specific pin mapping, real-world use cases, and validated alternative options - all grounded in the official Atmel AT49F001(N)(T) Rev. 1008D datasheet.
Technical Context
This device implements a standard parallel Flash interface with CE/OE/WE control logic, supporting EPROM-like read operation and command-based byte programming and sector/chip erase. Its internal program control logic eliminates need for external high-voltage programming circuitry.
The AT49F001T-90JC features a fixed 16 KB boot block located at address 1C000H–1FFFFH, two 8 KB parameter blocks, and two main memory blocks (32 KB and 64 KB), enabling flexible firmware partitioning. Boot block lockout is software-enabled and overrideable via 12 V on RESET pin - a capability confirmed for AT49F001T but not AT49F001N(T).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - sufficient for bootloader + configuration data in resource-constrained embedded hosts. |
| Read Access Time | 90 ns max - ensures compatibility with 11 MHz bus timing in legacy 8-bit microcontrollers without wait states. |
| Byte Programming Time | 10 µs typical - enables rapid field updates of small firmware patches without system downtime. |
| Erase Cycle Time | 10 seconds max for full chip - supports predictable maintenance windows during firmware upgrades. |
| End-of-Program Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - allows host MCU to poll status without timer overhead or external interrupt dependency. |
| Power Dissipation | 50 mA active current / 100 µA CMOS standby - suitable for low-power industrial controllers with battery backup requirements. |
| Endurance | 10,000 write/erase cycles - validated for applications requiring infrequent but reliable firmware revision management over product lifetime. |
Pinout & Package
AT49F001T-90JC is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package (JEDEC MS-016, Variation AE), with lead pitch 1.27 mm and body size 12.5 mm × 14.9 mm. Pin 1 identifier is a corner chamfer.
| 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 and 10000H–1FFFFH). |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel data path for read, program, and identification modes; supports standard microprocessor bus interfacing. |
| 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 gate; places I/O pins in high-impedance state when high - essential for shared data bus arbitration. |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming; noise-filtered against <15 ns glitches. |
| RESET | Reset Input | Logic-high = normal operation; low = outputs forced high-Z; 12 V pulse enables boot block reprogramming even when lockout is active. |
| VCC | Power Supply | +5.0 V ±10% supply; internal VCC sense disables programming if voltage drops below 3.8 V typical. |
| GND | Ground Reference | Signal and power ground reference for all I/O and internal logic; decoupling capacitor required per datasheet layout guidelines. |
| NC | No Connect | Pin 1 in PLCC package is NC - must remain unconnected per datasheet; no internal connection or function. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for dedicated 12 V programming voltage - simplifies PCB design and reduces BOM count in cost-sensitive embedded systems. |
| Sector Architecture with Boot Block Lockout | Enables secure bootloader storage (16 KB at 1C000H–1FFFFH) that persists across field updates - critical for fail-safe boot integrity in medical and industrial controllers. |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns), and control-line inhibition (OE low/CE high/WE high) prevent accidental writes - improves field reliability without software guardrails. |
| DATA Polling & Toggle Bit | Two independent, hardware-verified methods to detect program/erase completion - allows flexible polling strategy without external timing components or clock dependencies. |
| 10,000 Write/Erase Cycles | Validated endurance for >5 years of quarterly firmware updates - meets long-lifecycle requirements for industrial automation and telecom infrastructure. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing and updating firmware for programmable logic controllers deployed in factory-floor environments with ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; provides 90 ns read latency compatible with 8051 and Z80 derivatives. Use Value: Enables remote firmware patching without physical device replacement; boot block lockout prevents corruption of safety-critical startup routines during update. |
Use Scenario: Holding certified bootloader and calibration data in Class II medical instruments requiring traceable, tamper-resistant firmware storage. IC Role / Device Role / Timing Role: Secure, field-upgradable memory with hardware-enforced write protection for boot sector; RESET-pin override supports authorized service-mode reprogramming. Use Value: Meets IEC 62304 software lifecycle requirements by isolating immutable boot code from modifiable application partitions. |
| Legacy Automotive ECU Calibration | Point-of-Sale Terminal Configuration |
Use Scenario: Storing engine calibration maps and diagnostic parameters in Tier-1 automotive ECUs operating within commercial temperature range. IC Role / Device Role / Timing Role: Parallel-interface Flash memory with 10 µs/byte programming - supports fast calibration updates during vehicle service. Use Value: Sector erase capability allows selective update of parameter blocks without disturbing main firmware image - reducing service time and risk. |
Use Scenario: Retaining localized language packs, tax tables, and payment protocol configurations in retail POS terminals subject to regional regulatory changes. IC Role / Device Role / Timing Role: Field-reprogrammable nonvolatile memory with 10,000-cycle endurance - accommodates frequent regulatory updates over multi-year deployment. Use Value: Eliminates need for EEPROM + Flash hybrid solutions; single-chip architecture reduces board area and qualification effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF010-90-4C-NHE | 90 ns access, 1 Mbit, 3.3 V core (5 V tolerant I/O); no RESET-pin override for boot block unlock. | Lacks 12 V RESET override; boot protection relies solely on software lock - less suitable for service-accessible devices. | Select when system already uses 3.3 V supply and boot block reprogramming is never required in field service. |
| MX29LV160CBTI-90G | 90 ns access, 16 Mbit density, 3.0 V operation; CFI-compliant command set; no dedicated boot block lockout sequence. | Higher density but incompatible command protocol; requires different driver firmware and lacks AT49F001T's explicit boot sector protection model. | Choose only when migrating to larger code footprint and redesigning flash interface firmware; not drop-in replaceable. |
Compared with SST39VF010-90-4C-NHE and MX29LV160CBTI-90G, the AT49F001T-90JC uniquely combines 5 V-only operation, hardware-resettable boot lockout, and proven 10,000-cycle endurance in a PLCC package - making it optimal for legacy 5 V systems where bootloader security and field serviceability are mandatory.
Availability
AT49F001T-90JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, and legacy automotive ECU calibration requiring stable component supply and long-term obsolescence management.
Supply support for AT49F001T-90JC 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 cross-reference tools.
The AT49F001T-90JC belongs to Atmel's 5 V-only parallel Flash memory family, designed specifically for cost-sensitive, 5 V microcontroller-based systems needing field-upgradable firmware with robust boot integrity protection.
FAQ
What is the exact memory organization of the AT49F001T-90JC?
The AT49F001T-90JC contains 1 Mbit (131,072 × 8) of Flash memory, organized as 128K words × 8 bits. Its sector map comprises a 16 KB boot block (1C000H–1FFFFH), two 8 KB parameter blocks (1A000H–1BFFFH and 18000H–19FFFH), and two main memory blocks (10000H–17FFFH = 32 KB; 00000H–0FFFFH = 64 KB). This layout is explicitly defined in the AT49F001(N)(T) datasheet Rev. 1008D, Section 6.
Does the AT49F001T-90JC support 3.3 V operation?
No, the AT49F001T-90JC is strictly a 5 V-only device. Its DC operating range is specified as VCC = 5.0 V ±10% (4.5 V to 5.5 V), and programming is inhibited if VCC falls below 3.8 V typical. It is not 3.3 V compatible, and applying 3.3 V will result in undefined behavior or failure to program. This is confirmed in the "DC Characteristics" table (page 7) and "Features" section of the AT49F001(N)(T) datasheet.
How is boot block protection enabled and overridden on the AT49F001T-90JC?
Boot block lockout on the AT49F001T-90JC is enabled via a six-cycle command sequence (AAh/55h/80h/AAh/55h/40h to address 5555h). Once enabled, the 16 KB boot block (1C000H–1FFFFH) cannot be erased or programmed using ≤5.5 V signals. Override is achieved by applying 12.0 V ±0.5 V to the RESET pin - a feature confirmed for AT49F001T but not AT49F001N(T), per datasheet Section 3 and Note on page 6.
What package type does the AT49F001T-90JC use, and is pin 1 connected?
The AT49F001T-90JC uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package (ordering code suffix "JC"), conforming to JEDEC MS-016 Variation AE. Pin 1 is a no-connect (NC) terminal - it has no internal connection and must remain unconnected on the PCB, as stated in the "Pin Configurations" diagram (page 4) and "Ordering Information" table (page 16) of the AT49F001(N)(T) datasheet.
Can the AT49F001T-90JC be used interchangeably with the AT49F001-90JC?
No. The AT49F001T-90JC and AT49F001-90JC differ in boot block location and command behavior: the "T" variant places its 16 KB boot block at 1C000H–1FFFFH and supports RESET-pin override, while the base AT49F001-90JC locates the boot block at 00000H–03FFFH and lacks RESET override. These differences affect address decoding, lockout activation, and field service procedures - they are not functionally interchangeable without firmware and hardware review.
AT49F001T-90JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- 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-PLCC (13.97x11.43)
AT49F001T-90JC FAQ
1.How can I place an order for AT49F001T-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001T-90JC 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-90JC reliable?
The price and inventory of AT49F001T-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001T-90JC is usually 5 days.
3.What payment methods are accepted for AT49F001T-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001T-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001T-90JC?
AT49F001T-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001T-90JC 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-90JC?
For technical support, including AT49F001T-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001T-90JC requirements.
6.How does Aetrix verify that AT49F001T-90JC is sourced from the original manufacturer or authorized distributors?
All AT49F001T-90JC 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-90JC meets industry standards.
7.What is the process for return or replacement of AT49F001T-90JC?
All AT49F001T-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001T-90JC, 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-90JC part is unused and in its original packaging.
Return procedure for AT49F001T-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F001T-90JC Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
