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Microchip Technology AT49F1025-70JC
- Part No.:
- AT49F1025-70JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT49F1025-70JC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,011
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Product details
Overview
AT49F1025-70JC from Atmel is a 5V-only, 1 Mbit (64K × 16) Flash memory IC in PLCC-44 package, featuring 35 ns read access time, 10 µs/word programming, and hardware data protection. It integrates an 8K-word boot block with optional lockout for secure firmware storage and supports in-system reprogramming without high-voltage supplies.
For engineers reviewing the AT49F1025-70JC datasheet, AT49F1025-70JC pinout, AT49F1025-70JC application, or AT49F1025-70JC equivalent, key selection criteria include commercial temperature range (0°C to 70°C), PLCC-44 mechanical compatibility, boot-block write lockout behavior, and 70 ns maximum access timing compliance.
Technical Context
The AT49F1025-70JC implements a CMOS-based Flash architecture with dual-line control (CE/OE) for bus contention avoidance and internal command register-based programming. It supports three erase modes: chip erase, main memory block erase (excluding boot sector), and boot-block lockout activation via six-cycle command sequences.
Its operation relies on voltage-sensing (VCC ≥ 3.8 V required for programming), noise filtering (<15 ns pulse rejection on WE/CE), and dual end-of-operation detection-Data Polling (I/O7 complement) and Toggle Bit (I/O6 toggling)-enabling reliable embedded system integration without external timing supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (64K × 16 words), enabling 128 KB of 16-bit code/data storage |
| Access Time | 70 ns max tACC - defines worst-case read latency for synchronous bus timing budgets |
| Programming Time | 10 µs/word typical - enables rapid field updates without system downtime |
| Boot Block Size | 8K words (0000H–1FFFH) - reserves dedicated region for immutable bootloader code |
| Erase Cycle Time | 10 seconds typical chip erase - sets minimum firmware update interval in production environments |
| Endurance | 10,000 program/erase cycles - specifies lifetime limit for field-reprogrammable applications |
| Supply Voltage | 5V ±10% - eliminates need for auxiliary voltage rails in legacy 5V systems |
| Standby Current | 100 µA max (CMOS mode) - supports low-power hold states in battery-backed systems |
Pinout & Package
AT49F1025-70JC uses a 44-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-018 AC, with 1.27 mm pitch, 16.5 mm × 16.5 mm body, and pin 1 identifier notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus supporting full 64K-word addressing space |
| I/O0–I/O15 | Bidirectional Data Bus | 16-bit parallel interface compatible with 80Cxx/8051-style microcontroller buses |
| CE | Chip Enable | Active-low global select; must be low for any read/write operation |
| OE | Output Enable | Active-low output gate; controls data bus drive during reads only |
| WE | Write Enable | Active-low write strobe; latches address/data during programming/erase commands |
| VCC | Power Supply | 5V supply input; internal voltage sensing prevents programming below 3.8V |
| GND | Ground | Two dedicated ground pins (pins 18 & 30) reduce ground bounce in high-speed access |
| NC | No Connect | Pins 7, 19, 27, 28, 39, 40, 43 - electrically isolated; no PCB routing required |
Key Features
| Feature | Design Value |
|---|---|
| Single-Voltage Reprogramming | Eliminates need for 12V programming supplies - simplifies power design and reduces BOM cost |
| Hardware Data Protection | VCC sense + noise filtering + CE/OE/WE inhibit logic prevents accidental writes during power transients |
| Boot Block Lockout | Software-enabled permanent write protection for 0000H–1FFFH region - ensures bootloader integrity |
| Data Polling & Toggle Bit | Dual asynchronous status reporting (I/O7/I/O6) enables polling-based firmware without fixed delay loops |
| Word-by-Word Programming | Allows partial updates without full-chip erase - critical for over-the-air firmware patches |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Bootloader |
|---|---|
Use Scenario: Storing firmware in programmable logic controllers where field updates must preserve bootloader integrity while allowing application code revision. IC Role / Device Role / Timing Role: Nonvolatile code storage with 70 ns read access synchronized to 8051-compatible bus timing. Use Value: Boot block lockout prevents corruption of startup routines during remote firmware upgrades, ensuring deterministic system recovery. | Use Scenario: Hosting boot code in medical diagnostic equipment requiring regulatory-compliant firmware immutability after certification. IC Role / Device Role / Timing Role: Secure 16-bit instruction memory mapped at reset vector (0000H), accessed via standard EPROM read protocol. Use Value: Hardware-enforced write lockout eliminates risk of accidental bootloader overwrite during service technician reprogramming. |
| Automotive Instrument Cluster Memory | Point-of-Sale Terminal Configuration Storage |
Use Scenario: Retaining calibration data and display firmware in automotive dashboards operating across 0°C–70°C ambient range. IC Role / Device Role / Timing Role: Temperature-stable Flash memory interfaced to 8-bit microcontroller with 5V I/O tolerance. Use Value: 10,000-cycle endurance and 100 µA standby current support long-term reliability and low quiescent power in always-on modules. | Use Scenario: Storing localized language packs and tax rule tables in retail terminals deployed globally with infrequent firmware changes. IC Role / Device Role / Timing Role: Field-upgradable configuration memory accessed via parallel bus during initialization sequence. Use Value: 70 ns access time meets tight boot-time requirements while PLCC-44 package allows manual rework in cost-sensitive assembly lines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV160DB-70EC | 3.3V core with 5V I/O tolerance; 16 Mbit density; CFI-compliant command set | Requires level-shifting for pure 5V systems; larger capacity increases cost and layout area | Select when migrating to lower-voltage platforms or needing CFI-standardized firmware tools |
| SST39VF1601-70-4C-NHE | 3.3V supply only; 16 Mbit; 48-pin TSOP; no boot-block lockout feature | Lacks hardware-protected boot sector; incompatible with 5V-only designs without voltage translation | Choose for new 3.3V designs prioritizing density over legacy 5V compatibility and bootloader security |
Compared with AM29LV160DB-70EC and SST39VF1601-70-4C-NHE, the AT49F1025-70JC uniquely delivers 5V-only operation with integrated boot-block lockout in PLCC-44 - making it irreplaceable in certified legacy industrial controllers where voltage rail simplification and bootloader immutability are mandatory.
Availability
AT49F1025-70JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system bootloader retention, and automotive instrument cluster memory requiring stable component supply across extended product lifecycles.
Supply support for AT49F1025-70JC 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
Atmel Corporation, now part of Microchip Technology, designed high-reliability nonvolatile memory and microcontroller solutions for industrial, automotive, and communications markets.
The AT49F1025-70JC belongs to Atmel's 5V Flash memory product line, engineered specifically for in-system reprogrammability in legacy 5V embedded systems requiring secure boot code isolation and drop-in EPROM replacement.
FAQ
What is the operating temperature range for the AT49F1025-70JC?
The AT49F1025-70JC is rated for commercial temperature operation from 0°C to 70°C. This specification is confirmed in the official Atmel ordering information table, where "AT49F1025-70JC" is explicitly listed under the Commercial (0° to 70°C) operation range with PLCC-44 (44J) packaging. It does not support industrial or extended temperature grades.
Does the AT49F1025-70JC require external high-voltage programming signals?
No, the AT49F1025-70JC does not require external high-voltage programming signals. As stated in its features list and device description, it supports single-voltage operation: 5V for both read and reprogramming. Internal circuitry generates necessary programming voltages, and hardware protection (e.g., VCC sense below 3.8V inhibits programming) enforces this 5V-only requirement.
How is boot block protection enabled on the AT49F1025-70JC?
Boot block protection on the AT49F1025-70JC is enabled via a six-cycle software command sequence: load AAh to address 5555h, 55h to 2AAAh, 80h to 5555h, then AAh/55h/40h to 5555h/2AAAh/5555h respectively. Once activated, the 8K-word boot block (0000H–1FFFH) becomes permanently write- and erase-protected, and lockout status can be verified by reading bit I/O0 at address 0002H in software product identification mode.
What package type does the AT49F1025-70JC use, and how many pins does it have?
The AT49F1025-70JC uses a 44-lead Plastic J-Leaded Chip Carrier (PLCC) package, designated as "44J" in Atmel's ordering information. Its top-view pinout shows 44 physical terminals arranged in a square configuration with pin 1 identified by a corner notch, conforming to JEDEC standard MS-018 AC.
Can the AT49F1025-70JC be used as a direct replacement for standard EPROMs like the 27C512?
Yes, the AT49F1025-70JC is functionally compatible with 27C512 EPROMs in read mode: it uses identical CE/OE/WE control logic, 16-bit data bus, and 16-bit address bus (A0–A15), and outputs valid data within 70 ns. However, unlike EPROMs, it supports in-system reprogramming without UV erasure or external programmers - enabling true field-upgradable functionality where 27C512 requires socket removal and UV exposure.
AT49F1025-70JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 44-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:
- 64K x 16
- 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:
- 44-PLCC (16.6x16.6)
AT49F1025-70JC FAQ
1.How can I place an order for AT49F1025-70JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F1025-70JC 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 AT49F1025-70JC reliable?
The price and inventory of AT49F1025-70JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F1025-70JC is usually 5 days.
3.What payment methods are accepted for AT49F1025-70JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F1025-70JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F1025-70JC?
AT49F1025-70JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F1025-70JC 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 AT49F1025-70JC?
For technical support, including AT49F1025-70JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F1025-70JC requirements.
6.How does Aetrix verify that AT49F1025-70JC is sourced from the original manufacturer or authorized distributors?
All AT49F1025-70JC 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 AT49F1025-70JC meets industry standards.
7.What is the process for return or replacement of AT49F1025-70JC?
All AT49F1025-70JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F1025-70JC, 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 AT49F1025-70JC part is unused and in its original packaging.
Return procedure for AT49F1025-70JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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