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Microchip Technology AT49F001-12JC
- Part No.:
- AT49F001-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001-12JC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F001-12JC 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 typical byte programming, 10-second chip erase, sector architecture with boot block lockout, and CMOS standby current of 100 µA. It is commonly deployed in firmware update storage for industrial controllers and legacy BIOS modules.
For engineers reviewing the AT49F001-12JC datasheet, AT49F001-12JC pinout, AT49F001-12JC application, or AT49F001-12JC equivalent, key selection considerations include its PLCC-32 package, 120 ns maximum access time variant, boot-sector write protection capability, hardware reset override for locked sectors, and compatibility with standard EPROM-style bus interfacing (CE/OE/WE control).
Technical Context
The AT49F001-12JC implements a sector-organized Flash architecture with one 16 KB boot block (address range 00000H–03FFFH), two 8 KB parameter blocks, and two main memory blocks (32 KB and 64 KB). Its command-based operation uses six-byte sequences for chip/sector erase and four-byte sequences for byte programming, all executed via standard microprocessor timing on CE/WE-controlled buses.
It supports DATA polling (I/O7 complement) and toggle-bit detection (I/O6 toggling) to monitor program/erase completion without external timing constraints. Hardware data protection includes VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibition (OE low, CE high, or WE high blocks writes).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (131,072 × 8), organized as 128K words × 8 bits - directly replaces 27C010 EPROMs in 8-bit bus systems. |
| Read Access Time | 120 ns max (AT49F001-12JC suffix denotes this speed grade) - ensures compatibility with 8 MHz Z80 or 68K-based systems requiring ≤120 ns memory fetch. |
| Byte Programming Time | 10 µs typical (50 µs max) - enables fast field updates of small configuration tables without system interruption. |
| Chip Erase Time | 10 seconds - deterministic internal timing eliminates need for external erase timers or watchdog coordination. |
| Standby Current | 100 µA (CMOS, commercial temp) - suitable for battery-backed applications where leakage must remain below 0.1 mA during sleep. |
| Endurance | 10,000 program/erase cycles - validated for firmware revision logging and parameter storage in industrial HMI devices. |
| Operating Voltage | 5.0 V ±10% - single-supply operation simplifies power design versus 12 V-programmed EPROMs or multi-voltage EEPROMs. |
Pinout & Package
AT49F001-12JC is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE, with dimensions 12.45 mm × 14.95 mm × 3.35 mm (max height). Pin 1 identifier is a corner chamfer; pins are J-leaded with coplanarity ≤0.102 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A0–A16 map directly to CPU address lines A0–A16. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with 8051, Z80, and 68000 data buses; high-impedance when CE or OE is inactive. |
| CE | Chip Enable | Active-low chip select; enables device decoding - must be low with OE low and WE high for valid read access. |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during shared-memory access. |
| WE | Write Enable | Active-low write strobe; latches address/data during programming/erase command sequences. |
| RESET | Hardware Reset Input | Active-low reset halts operations and forces outputs to high-Z; applying 12 V enables boot block override (not available on N/T variants). |
| VCC | Power Supply | +5 V ±10% supply; powers core logic and charge pumps - requires local 0.1 µF ceramic decoupling. |
| GND | Ground Reference | Digital ground return; must be low-inductance connection to minimize noise coupling into I/O and control lines. |
| NC | No Connect | Pin 32 in PLCC package - left unconnected per datasheet; no internal bonding or function. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | 16 KB boot block (00000H–03FFFH) can be permanently write-protected via command sequence - secures bootloader code against accidental overwrite during field firmware updates. |
| Hardware Boot Override | Applying 12 V to RESET pin temporarily disables boot lockout - allows recovery of corrupted boot code without socketing or UV erasure. |
| DATA Polling & Toggle Bit | I/O7 complement and I/O6 toggling provide real-time, software-driven status feedback - eliminates need for fixed delay loops or external busy signals in host firmware. |
| Single 5 V Operation | No external high-voltage programming supply required - reduces BOM count and PCB complexity versus EPROMs or older Flash parts needing 12 V. |
| Internal Program Timer | All erase and program cycles fully self-timed - host processor only initiates commands and monitors status; no external timing components needed. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Module |
|---|---|
Use Scenario: Storing ladder logic firmware and configuration parameters in programmable logic controllers with infrequent field updates. IC Role / Device Role / Timing Role: Nonvolatile code storage with boot-sector protection ensuring safe execution of startup routines after power cycle. Use Value: 10,000-cycle endurance and 120 ns access meet deterministic scan-time requirements while preventing corruption of critical initialization code. | Use Scenario: Replacing obsolete 27C010 EPROMs in ISA-bus motherboard BIOS chips requiring in-circuit reprogramming. IC Role / Device Role / Timing Role: Drop-in EPROM-compatible Flash memory with identical pinout and read protocol, enabling BIOS upgrades without hardware redesign. Use Value: 5 V-only operation and 120 ns access match legacy chipset timing margins; sector erase allows selective update of option ROMs without full chip reflash. |
| Embedded Instrument Bootloader | Telecom Line Card Parameter Storage |
Use Scenario: Holding secure bootloader code and calibration constants in handheld test equipment with field-serviceable firmware. IC Role / Device Role / Timing Role: Dual-role memory: protected boot block stores immutable startup code; parameter blocks store user-adjustable settings. Use Value: Boot lockout prevents unauthorized modification; 8 KB parameter blocks support independent erase/rewrite of calibration data without affecting firmware. | Use Scenario: Storing line-specific provisioning data (e.g., gain tables, loop diagnostics) in carrier-grade DSLAM line cards. IC Role / Device Role / Timing Role: Field-updatable nonvolatile storage accessed via microcontroller SPI-to-parallel bridge or direct bus interface. Use Value: 100 µA standby current extends uptime during maintenance mode; 10-second chip erase enables rapid card re-provisioning in central office environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV001MT-120EC | 3 V core with 5 V I/O tolerant; 120 ns access; 1 Mbit; PLCC-32; lacks boot lockout override via RESET pin. | Requires level-shifting for pure 5 V systems; no 12 V boot override - recovery requires full chip erase or external programmer. | Select if migrating to lower-power 3 V designs; avoid if 12 V override is required for field recovery. |
| SST39VF010-120-4C-NHE | 3.3 V operation only; 120 ns access; 1 Mbit; PLCC-32; includes byte-write enable but no hardware RESET override. | Incompatible with 5 V-only buses without translation; no boot sector protection override mechanism - lockout is permanent once enabled. | Choose for new 3.3 V designs with tight power budgets; not suitable as drop-in replacement in legacy 5 V systems. |
Compared with AM29LV001MT-120EC and SST39VF010-120-4C-NHE, the AT49F001-12JC uniquely supports 5 V-only operation with hardware-enabled boot block recovery, making it the only option among the three that permits in-system restoration of locked firmware using standard 12 V programming supplies already present on many legacy development/test platforms.
Availability
AT49F001-12JC is available at Aetrix Electronics and suitable for industrial control systems, legacy computing upgrades, and embedded instrumentation requiring stable component supply with long-term lifecycle support.
Supply support for AT49F001-12JC 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 as part of its legacy Flash memory portfolio.
The AT49F001 product line was designed for cost-sensitive, 5 V-based embedded systems needing reliable, in-system reprogrammable nonvolatile storage with EPROM compatibility and sector-level security.
FAQ
What is the maximum read access time specified for the AT49F001-12JC?
The AT49F001-12JC is rated for a maximum read access time of 120 ns under commercial temperature conditions (0°C to 70°C) at VCC = 5.0 V ±10%. This value is confirmed in the AC Read Characteristics table of the datasheet and defines the slowest guaranteed time from address stabilization to valid data on I/O0–I/O7. The "12" in the part number explicitly denotes this 120 ns speed grade.
Does the AT49F001-12JC support hardware reset-based boot block override?
Yes, the AT49F001-12JC supports boot block override by applying 12.0 V ±0.5 V to the RESET pin. This feature temporarily disables the boot block programming lockout, allowing chip erase, sector erase, or byte programming of the protected 16 KB region. This capability is documented in the "Boot Block Programming Lockout Override" section and is specific to the base AT49F001 (not the N, T, or NT variants).
What package type is used for the AT49F001-12JC?
The AT49F001-12JC uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, designated as 32J per Atmel's ordering information. Its mechanical dimensions conform to JEDEC MS-016, Variation AE, with a body size of 12.45 mm × 14.95 mm and J-shaped leads. Pin 1 is identified by a corner chamfer, and pin 32 is NC (no connect).
How does the AT49F001-12JC indicate completion of a byte programming cycle?
The AT49F001-12JC provides two hardware methods to detect byte programming completion: DATA polling (reading the programmed address returns the complement of the loaded data on I/O7 until complete) and the Toggle Bit (I/O6 toggles between 0 and 1 during programming and stops toggling when complete). Both mechanisms allow host firmware to poll asynchronously without fixed delays or external timing components.
What is the memory organization and sector layout of the AT49F001-12JC?
The AT49F001-12JC organizes its 1 Mbit (128K × 8) array into five distinct sectors: one 16 KB boot block (00000H–03FFFH), two 8 KB parameter blocks (04000H–05FFFH and 06000H–07FFFH), and two main memory blocks (08000H–0FFFFH = 32 KB; 10000H–1FFFFH = 64 KB). This layout enables selective erasure and independent protection of critical startup code.
AT49F001-12JC 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:
- 120 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)
AT49F001-12JC FAQ
1.How can I place an order for AT49F001-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001-12JC 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 AT49F001-12JC reliable?
The price and inventory of AT49F001-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001-12JC is usually 5 days.
3.What payment methods are accepted for AT49F001-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001-12JC?
AT49F001-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001-12JC 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 AT49F001-12JC?
For technical support, including AT49F001-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001-12JC requirements.
6.How does Aetrix verify that AT49F001-12JC is sourced from the original manufacturer or authorized distributors?
All AT49F001-12JC 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 AT49F001-12JC meets industry standards.
7.What is the process for return or replacement of AT49F001-12JC?
All AT49F001-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001-12JC, 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 AT49F001-12JC part is unused and in its original packaging.
Return procedure for AT49F001-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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