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Microchip Technology AT49F001-55JC
- Part No.:
- AT49F001-55JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F001-55JC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,020
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Product details
Overview
AT49F001-55JC from Microchip Technology (formerly Atmel) is a 5V-only, 1 Mbit (128K × 8) in-system reprogrammable Flash memory IC with 55 ns read access time, 10 µs/byte typical programming time, and sector-based architecture including a 16 KB boot block with programmable lockout. It operates across 0°C to 70°C and is used in embedded firmware storage for industrial controllers and legacy BIOS modules.
For engineers reviewing the AT49F001-55JC datasheet, AT49F001-55JC pinout, AT49F001-55JC application, or AT49F001-55JC equivalent, key selection criteria include its PLCC-32 package, 5V single-supply operation, hardware data protection features, and boot-block write-protection capability for secure code retention.
Technical Context
The AT49F001-55JC implements a command-driven architecture requiring six-byte sequences for chip/sector erase and boot lockout enablement, with internal timing eliminating external clocks. Its memory is partitioned into one 16 KB boot block (00000H–03FFFH), two 8 KB parameter blocks, and two main memory blocks (32 KB and 64 KB).
It supports standard EPROM-like read interface (CE/OE/WE control), DATA polling and toggle-bit methods for program/erase completion detection, and hardware safeguards including VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and multi-signal inhibit logic (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 maps to 16-bit microcontroller data bus without byte-swapping logic. |
| Read Access Time | 55 ns max - enables direct interfacing with 12–15 MHz 8051 or Z80 derivatives without wait states. |
| Byte Programming Time | 10 µs typical - allows field firmware patching at ~100 KB/s sustained rate under optimal bus timing. |
| Erase Cycle Time | 10 seconds max for full chip - supports batch reprogramming during factory calibration or field update windows. |
| Endurance | 10,000 write/erase cycles - qualifies for firmware update cycles in industrial HMI and PLC boot loaders. |
| Standby Current | 100 µA CMOS - enables low-power sleep modes in battery-backed embedded systems. |
| Operating Voltage | 5.0 V ±10% - compatible with legacy 5V TTL/CMOS system rails without level-shifting. |
Pinout & Package
AT49F001-55JC is housed in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016, Variation AE, with lead coplanarity ≤0.102 mm and body dimensions 12.47 mm × 14.99 mm × 3.35 mm (max height).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address Inputs | 17-bit address bus supporting full 128K-word addressing; A0–A16 must be stable before CE/WE assertion for valid access. |
| CE | Chip Enable | Active-low chip select; when high, places I/O pins in high-impedance state to prevent bus contention on shared data buses. |
| OE | Output Enable | Active-low output control; used with CE to implement dual-line gating for glitch-free read arbitration in multi-master systems. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence timing; must be high during reads. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; drives valid data during reads, accepts program data during writes; supports DATA polling on I/O7 and toggle-bit on I/O6. |
| RESET | Reset Input | Active-low reset; halts ongoing program/erase and forces outputs to high-Z; 12 V override enables boot block reprogramming when lockout is active. |
| VCC | Power Supply | +5 V ±10% supply; powers core logic and charge pumps; VCC sense circuitry disables programming if voltage drops below 3.8 V. |
| GND | Ground Reference | Signal and power ground reference; requires low-inductance connection to minimize noise coupling during erase pulses. |
| NC | No Connect | Pin 1 in PLCC package - must remain unconnected per datasheet; floating or tied to GND/VCC causes undefined behavior. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | Enables permanent storage of bootloader code in 16 KB protected region while allowing field updates to application firmware in main memory blocks. |
| Hardware Data Protection | Combines VCC sensing, multi-signal inhibit (CE/OE/WE), and noise filtering to prevent accidental writes during power transients or EMI events. |
| DATA Polling & Toggle-Bit Detection | Eliminates need for fixed delay timers in firmware; allows immediate initiation of next read/write cycle upon program/erase completion confirmation. |
| 5V-Only Reprogramming | Removes requirement for +12 V programming supplies, simplifying power design and enabling in-circuit updates via standard system 5V rail. |
| 10,000 Program/Erase Cycles | Supports long-term field maintenance: e.g., 100 firmware patches over 10 years at one patch/month average. |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Modules |
|---|---|
Use Scenario: Storing ladder logic executables and configuration parameters in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with fast 55 ns read access to support real-time scan-cycle execution and in-field firmware upgrades. Use Value: Boot block lockout prevents corruption of critical startup routines during remote updates, ensuring deterministic boot behavior after power loss. |
Use Scenario: Holding BIOS initialization code and hardware abstraction layer in desktop motherboards using Intel 430FX or AMD 5x86 platforms. IC Role / Device Role / Timing Role: EPROM-replacement Flash memory providing direct drop-in compatibility with existing 5V address/data bus timing. Use Value: 10 µs/byte programming enables rapid BIOS recovery from corrupted images without external programmers. |
| Embedded HMI Bootloader | Telecom Line Card Configuration |
Use Scenario: Secure boot code storage in human-machine interface terminals used in medical equipment with regulatory firmware validation requirements. IC Role / Device Role / Timing Role: Trusted execution root-of-trust component; boot block holds signed bootloader verified prior to application load. Use Value: 12 V RESET override allows authorized service technicians to reflash locked boot code during certified maintenance procedures. |
Use Scenario: Storing line-specific DSP configuration tables and calibration coefficients in T1/E1 channelized telecom interface cards. IC Role / Device Role / Timing Role: Parameter block storage for field-updatable operational settings; isolated 8 KB sectors allow independent reprogramming without affecting main firmware. Use Value: Sector erase capability enables carrier-specific tuning without full card replacement or system downtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV001BT-55REI | 3.3 V core with 5 V I/O tolerance; 55 ns access; 1 Mbit; TSOP-32 package only - no PLCC option. | Requires level translation for pure 5 V systems; lacks RESET pin and boot block lockout override. | Select when migrating to lower-power 3.3 V designs and board layout supports TSOP footprint. |
| MX29LV001CTTI-55G | 5 V-only; 55 ns; 1 Mbit; PLCC-32 available; boot block size identical but lockout mechanism differs (no 12 V override). | Compatible pinout and voltage, but boot protection cannot be overridden in-field without full chip erase. | Choose for cost-sensitive 5 V designs where boot code updates are performed only in factory environments. |
Compared with AM29LV001BT-55REI and MX29LV001CTTI-55G, the AT49F001-55JC uniquely combines PLCC-32 packaging, 12 V RESET-based boot override, and strict 5 V-only operation - making it irreplaceable in legacy 5 V systems requiring field-serviceable secure boot code.
Availability
AT49F001-55JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS modules, and embedded HMI bootloader applications requiring stable component supply across extended product lifecycles.
Supply support for AT49F001-55JC 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 memory products, including manufacturing, documentation, and technical assistance.
The AT49F001-55JC belongs to Atmel's 5V Flash memory family designed specifically for drop-in EPROM replacement in industrial, telecom, and computing applications requiring in-system reprogrammability without high-voltage programming circuits.
FAQ
What is the boot block address range for AT49F001-55JC?
The AT49F001-55JC uses the AT49F001(N) variant addressing scheme, where the 16 KB boot block occupies addresses 00000H to 03FFFH. This is confirmed by the device code 05H (per Software Product Identification table) and applies specifically to the -JC PLCC package variant. The alternate AT49F001T variant uses 1C000H–1FFFFH, but that does not apply to AT49F001-55JC.
Does AT49F001-55JC support 12 V RESET override for boot block reprogramming?
Yes, AT49F001-55JC supports 12 V ±0.5 V applied to the RESET pin to override boot block programming lockout - a feature explicitly documented for the AT49F001(N) series. This allows authorized reprogramming of the protected boot sector even after lockout has been enabled, provided RESET is driven to 12 V during the erase/program sequence.
What is the maximum allowable VCC during programming of AT49F001-55JC?
The AT49F001-55JC specifies VCC = 5.0 V ±10%, meaning the absolute maximum is 5.5 V. Programming is inhibited if VCC falls below 3.8 V (typical), and applying >5.5 V risks permanent damage per Absolute Maximum Ratings. All command sequences - including boot lockout enable and chip erase - must be executed within this 4.5–5.5 V window.
Can AT49F001-55JC be used in industrial temperature range applications?
No - AT49F001-55JC is rated for commercial temperature range only (0°C to +70°C). The industrial-grade variant is AT49F001-55JI (same PLCC-32 package, –40°C to +85°C). Using AT49F001-55JC outside 0–70°C violates datasheet specifications and may result in read errors, failed programming, or accelerated wear-out.
How is the end of a byte programming cycle detected on AT49F001-55JC?
AT49F001-55JC supports two hardware methods: DATA polling (reading the programmed byte returns complemented data on I/O7 until completion, then true data) and toggle-bit detection (I/O6 toggles between 0 and 1 during programming and stabilizes upon completion). Both methods are fully functional and require no external timing components.
AT49F001-55JC 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:
- 55 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)
AT49F001-55JC FAQ
1.How can I place an order for AT49F001-55JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F001-55JC 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 AT49F001-55JC reliable?
The price and inventory of AT49F001-55JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F001-55JC is usually 5 days.
3.What payment methods are accepted for AT49F001-55JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F001-55JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F001-55JC?
AT49F001-55JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F001-55JC 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 AT49F001-55JC?
For technical support, including AT49F001-55JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F001-55JC requirements.
6.How does Aetrix verify that AT49F001-55JC is sourced from the original manufacturer or authorized distributors?
All AT49F001-55JC 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 AT49F001-55JC meets industry standards.
7.What is the process for return or replacement of AT49F001-55JC?
All AT49F001-55JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F001-55JC, 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 AT49F001-55JC part is unused and in its original packaging.
Return procedure for AT49F001-55JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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