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Microchip Technology AT49F001T-70JC
- Part No.:
- AT49F001T-70JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001T-70JC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F001T-70JC 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 16K-byte boot block (address range 1C000H–1FFFFH) featuring programmable lockout.
For engineers reviewing the AT49F001T-70JC datasheet, AT49F001T-70JC pinout, AT49F001T-70JC application, or AT49F001T-70JC equivalent, this page delivers verified specifications, PLCC-32 package details, boot-block security behavior, DATA polling/toggle-bit status detection, and real-world use cases in firmware update-capable industrial controllers and legacy BIOS modules.
Technical Context
The AT49F001T-70JC implements a standard parallel Flash interface with CE/OE/WE control logic, supporting EPROM-like read timing and command-based byte/sector/chip erase and program operations. Its internal state machine executes 6-cycle command sequences (e.g., 5555H/AAH → 2AAAH/55H → 5555H/80H) to enter erase or lockout modes without external high-voltage circuitry.
It uses CMOS-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V), supports TTL/CMOS standby current modes (100 µA at 5 V), and integrates hardware safeguards including VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and write-inhibit via OE/CE/WE logic states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8 bits), organized as 128K words × 8 bits - directly replaces EPROMs in 8-bit bus systems. |
| Read Access Time | 70 ns max - ensures compatibility with 14 MHz Z80 or 8051-based systems requiring ≤70 ns memory wait states. |
| Byte Programming Time | 10 µs typical (50 µs max) - enables fast field updates of configuration parameters without system downtime. |
| Erase Cycle Time | 10 seconds max for full chip erase - allows predictable firmware recovery windows in unattended remote devices. |
| 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 | 16K-byte sector (1C000H–1FFFFH) with lockout enabled via 6-cycle command; override possible only with 12 V on RESET - secures bootloader integrity while permitting application updates. |
| Operating Voltage | 5.0 V ±10% - operates from standard logic rail without auxiliary voltage supplies. |
| Temperature Range | 0°C to +70°C (Commercial) - validated for office, lab, and non-extreme industrial environments. |
Pinout & Package
AT49F001T-70JC is housed in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per 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 selects upper 64K region where boot block resides (1C000H–1FFFFH). |
| I/O0–I/O7 | Data Inputs/Outputs | Bi-directional 8-bit data bus; I/O7 used for DATA polling, I/O6 for toggle-bit status during program/erase. |
| 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; high-Z when deasserted, enabling shared bus operation with other peripherals. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence timing. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; 12 V applied here overrides boot block lockout (not available on N(T) variants). |
| VCC | Power Supply | +5.0 V ±10% supply; draws 50 mA active, 100 µA CMOS standby - enables low-power sleep modes in battery-backed systems. |
| GND | Ground | Reference return path for all signals and power; decoupling capacitor required within 1 cm of VCC/GND pins. |
| NC | No Connect | Pin 32 in PLCC package - must remain unconnected; no internal bond wire or circuit connection. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | One 16K-byte boot block (1C000H–1FFFFH), two 8K-byte parameter blocks, and two main memory blocks (32K/64K bytes) - enables granular firmware partitioning and safe over-the-air updates. |
| Hardware Data Protection | VCC sense (<3.8 V disables programming), noise filtering (<15 ns pulses rejected), and write-inhibit via OE/CE/WE states - prevents accidental writes during power transients or EMI events. |
| Boot Block Lockout | Software-enabled permanent write protection for boot code; once activated, boot block remains immutable at ≤5.5 V - guarantees bootloader integrity across power cycles and field upgrades. |
| 10,000 Write/Erase Cycles | Endurance rating validated per JEDEC JESD22-A117 - supports >5 years of daily firmware patching in industrial HMI or gateway applications. |
| DC and AC Compatibility | Meets TTL/CMOS voltage thresholds (VIL = 0.8 V, VIH = 2.0 V) and timing (tACC = 70 ns, tWP = 90 ns) - interoperates with legacy 80C51, 68HC11, and Z80 designs without level shifters. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Module |
|---|---|
Use Scenario: Storing ladder logic firmware and I/O configuration tables in modular programmable logic controllers with field-upgrade capability. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; 70 ns read timing satisfies 14 MHz CPU bus requirements. Use Value: Enables secure, offline firmware patches via serial port without removing the module - reducing maintenance downtime by >90% versus EPROM-based solutions. |
Use Scenario: Replacing obsolete 27C010 EPROMs in desktop motherboard BIOS chips requiring hot-swappable updates. IC Role / Device Role / Timing Role: Boot memory mapped at 0xF0000–0xFFFFF; boot block (1C000H–1FFFFH) holds protected initialization code. Use Value: Lockout feature prevents corruption of critical POST routines during BIOS updates - eliminating bricked-board failures in manufacturing test lines. |
| Embedded Network Gateway Bootloader | Medical Device Configuration Memory |
Use Scenario: Hosting secure bootloader code in Ethernet/Wi-Fi gateways that validate and load signed application images from flash. IC Role / Device Role / Timing Role: Trusted execution root; boot block stores cryptographic verification keys and signature-checking routines. Use Value: 12 V RESET override allows factory reprogramming of bootloader keys without PCB redesign - supporting regulatory recertification after security patches. |
Use Scenario: Storing calibrated sensor offsets, user preferences, and device serial logs in portable diagnostic equipment with battery backup. IC Role / Device Role / Timing Role: Parameter storage in 8K-byte parameter blocks; accessed via polled I/O during power-on self-test. Use Value: 100 µA standby current extends battery life beyond 5 years in always-on monitoring mode - meeting IEC 62304 Class C longevity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV001MT-70EC | 3.3 V core with 5 V tolerant I/O; 70 ns read; 1 Mbit density; no RESET-based boot override. | Requires level-shifting in pure 5 V systems; lacks 12 V boot unlock - unsuitable for legacy BIOS rekeying. | Select if migrating to lower-power 3.3 V design with external voltage translation. |
| SST39VF010-70-4C-NHE | 3.3 V only; 70 ns read; 1 Mbit; top-boot sector (00000H–03FFFH); no 12 V override. | Boot block at lowest address - incompatible with AT49F001T-70JC's high-address (1C000H) layout; requires PCB address bus rerouting. | Select only for new 3.3 V designs where boot block location flexibility is acceptable. |
Compared with AM29LV001MT-70EC and SST39VF010-70-4C-NHE, the AT49F001T-70JC uniquely supports 5 V-only operation with hardware-protected boot block reprogramming via 12 V RESET - making it the sole option for maintaining legacy 5 V systems requiring field-recoverable bootloader updates.
Availability
AT49F001T-70JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS modules, embedded network gateway bootloaders, and medical device configuration memory requiring stable component supply and long-term obsolescence management.
Supply support for AT49F001T-70JC 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 supply chain support for the AT49F001 family of parallel Flash memories.
The AT49F001 series was designed for cost-sensitive, 5 V embedded systems needing field-upgradable nonvolatile storage with EPROM compatibility - targeting industrial control, telecom infrastructure, and legacy computing platforms.
FAQ
What is the boot block address range for AT49F001T-70JC?
The boot block for AT49F001T-70JC occupies addresses 1C000H to 1FFFFH (16 Kbytes). This differs from the base AT49F001(N) variant, which places the boot block at 00000H–03FFFH. The high-address placement isolates critical startup code from main application memory, reducing risk of accidental overwrite during firmware updates. This layout is fixed and cannot be remapped in the AT49F001T-70JC.
Does AT49F001T-70JC support 3.3 V operation?
No, AT49F001T-70JC is strictly a 5 V-only device, requiring VCC = 5.0 V ±10%. It does not support 3.3 V core operation or mixed-voltage I/O. Attempting to operate below 4.5 V disables programming functions via internal VCC sense circuitry, and voltages above 5.5 V risk permanent damage. Systems requiring 3.3 V compatibility must select alternatives like the AM29LV001MT series.
How is boot block lockout overridden on AT49F001T-70JC?
Boot block lockout on AT49F001T-70JC is overridden by applying 12.0 V ±0.5 V to the RESET pin while executing chip erase, sector erase, or byte program commands. This voltage level temporarily disables the lockout circuit, allowing reprogramming of the protected 16K-byte region. Once RESET returns to 5 V TTL levels, lockout re-engages. This feature is absent in AT49F001N(T) variants.
What package type is used for AT49F001T-70JC?
AT49F001T-70JC uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, designated as 32J per Atmel's ordering guide. Its dimensions conform to JEDEC MS-016, Variation AE: 12.5 mm × 14.9 mm body, 1.27 mm lead pitch, and pin 1 identified by a corner chamfer. This surface-mount package supports reflow soldering and offers superior thermal performance versus PDIP in dense layouts.
Can AT49F001T-70JC be used in industrial temperature applications?
No, AT49F001T-70JC is rated only for the commercial temperature range (0°C to +70°C), as indicated by the "C" suffix in its ordering code. For industrial applications (−40°C to +85°C), the correct part is AT49F001T-70JI (PLCC) or AT49F001T-70TI (TSOP). Using the -70JC variant outside its specified range may result in read timing violations, increased standby current, or premature endurance failure.
AT49F001T-70JC 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:
- 70 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-70JC FAQ
1.How can I place an order for AT49F001T-70JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001T-70JC 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-70JC reliable?
The price and inventory of AT49F001T-70JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001T-70JC is usually 5 days.
3.What payment methods are accepted for AT49F001T-70JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001T-70JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001T-70JC?
AT49F001T-70JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001T-70JC 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-70JC?
For technical support, including AT49F001T-70JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001T-70JC requirements.
6.How does Aetrix verify that AT49F001T-70JC is sourced from the original manufacturer or authorized distributors?
All AT49F001T-70JC 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-70JC meets industry standards.
7.What is the process for return or replacement of AT49F001T-70JC?
All AT49F001T-70JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001T-70JC, 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-70JC part is unused and in its original packaging.
Return procedure for AT49F001T-70JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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