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Microchip Technology AT49F1025-70JI
- Part No.:
- AT49F1025-70JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT49F1025-70JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F1025-70JI from Atmel is a 1-megabit (64K × 16) 5V-only Flash memory IC used for nonvolatile program/data storage in embedded microcontroller systems. It features 35 ns read access time, 10 µs/word programming, 10,000 write cycles, and an 8K-word boot block with hardware lockout - deployed in industrial firmware update modules requiring reliable in-system reprogramming.
For engineers reviewing the AT49F1025-70JI datasheet, AT49F1025-70JI pinout, AT49F1025-70JI application, or AT49F1025-70JI equivalent, key selection criteria include industrial temperature support (−40°C to +85°C), PLCC-44 package compatibility, boot-block write protection, Data Polling/Toggle Bit erase-program status detection, and 5V-only command-based operation without high-voltage programming pins.
Technical Context
The AT49F1025-70JI implements a CMOS-based Flash architecture with dual-line chip enable (CE) and output enable (OE) control for bus contention prevention. Its internal command register executes six-cycle Chip Erase and Main Memory Erase sequences using address/data latching at 5555H/2AAA locations, enabling deterministic in-system reprogramming without external voltage boosters.
It supports three operational modes: Read (CE/OE low, WE high), Word Program (CE low, WE low, OE high), and Standby (CE high). Hardware data protection includes VCC sense (<3.8V inhibition), noise filtering (<15 ns pulse rejection on CE/WE), and program-inhibit logic - ensuring robustness in electrically noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1 Mbit (64K × 16 words) - provides sufficient space for bootloader + application firmware in 16-bit microcontroller systems. |
| Read Access Time | 70 ns - meets timing requirements for 14 MHz bus interfaces in legacy industrial controllers. |
| Word Programming Time | 10 µs typical - enables fast field firmware patching with minimal system downtime. |
| Erase Cycle Time | 10 seconds max for full chip - allows predictable maintenance windows during device servicing. |
| End-of-Operation Detection | Data Polling on I/O7 and Toggle Bit on I/O6 - eliminates need for fixed delay timers in host firmware. |
| Boot Block Protection | 8K-word (0000H–1FFFH) lockout via 6-cycle command sequence - secures critical startup code against accidental overwrite. |
| Operating Temperature | −40°C to +85°C - certified for use in industrial automation, motor drives, and outdoor metering equipment. |
| VCC Supply | 5V ±10% - compatible with standard TTL/CMOS logic rails without auxiliary regulators. |
Pinout & Package
AT49F1025-70JI uses a 44-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-018AC, with 1.27 mm pitch and 16.5 mm × 16.5 mm body size. Pin 1 is marked by a corner chamfer and dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus for accessing all 64K words; A0–A15 fully decoded with no address multiplexing. |
| I/O0–I/O15 | Bidirectional Data Bus | 16-bit parallel interface supporting word-level reads/writes; high-impedance when CE or OE is inactive. |
| CE | Chip Enable | Active-low global select; must be low for any memory access - used for chip selection in multi-device systems. |
| OE | Output Enable | Active-low output gate; controls data bus drive independently of CE - prevents bus contention during shared-bus arbitration. |
| WE | Write Enable | Active-low write strobe; latches data on rising edge during programming - central to command execution timing. |
| VCC / GND | Power Supply | Single 5V supply with two GND pins (pins 18 and 30); decoupling required within 10 mm of VCC pin 31. |
| NC | No Connect | Pins 7, 19, 20, 27, 28, 42, 43 - must remain unconnected; no internal bonding or function. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-only reprogramming | Eliminates need for 12V programming supplies - simplifies power design and reduces BOM cost in field-upgradable systems. |
| Hardware boot block lockout | Permanent write protection for 8K-word region after 6-cycle unlock command - ensures bootloader integrity across firmware updates. |
| Data Polling & Toggle Bit | Real-time status feedback via I/O7 complement and I/O6 toggling - enables host CPU to poll instead of using fixed timeouts, improving system responsiveness. |
| Internal program timer | On-chip timing generator handles all erase/program pulses - relieves host controller of precise timing control and waveform generation. |
| VCC sense protection | Automatic program inhibition below 3.8V - prevents bit corruption during brown-out or unstable power conditions. |
| Noise-filtered CE/WE inputs | Rejects transients <15 ns - increases immunity to EMI in motor-drive or relay-switching environments. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile storage for boot code and runtime parameters; accessed via 16-bit parallel bus synchronized to 14 MHz system clock. Use Value: 70 ns read access ensures zero-wait-state operation; industrial temp rating and hardware lockout prevent field corruption during power cycling or ESD events. | Use Scenario: Securing boot firmware in Class II medical devices requiring FDA-compliant update mechanisms and data integrity verification. IC Role / Device Role / Timing Role: Primary boot memory holding signed bootloader image; accessed during cold start before RAM initialization. Use Value: 8K-word lockout protects cryptographic keys and signature validation routines; 10,000-cycle endurance supports lifetime field updates without replacement. |
| Automotive Diagnostic Tool | Energy Meter Firmware |
Use Scenario: Field-upgradable firmware storage in handheld OBD-II diagnostic tools exposed to automotive battery voltage fluctuations and thermal stress. IC Role / Device Role / Timing Role: In-system reprogrammable Flash for protocol stacks and vehicle-specific calibration tables. Use Value: 5V-only operation matches 12V-to-5V regulator output; Data Polling enables deterministic update progress reporting to user interface. | Use Scenario: Firmware and tariff table storage in smart electricity meters deployed in outdoor substations with −40°C winter operation. IC Role / Device Role / Timing Role: Persistent storage for metrology algorithms and time-stamped consumption logs; accessed during daily firmware checks. Use Value: Industrial temperature range and 10-second erase cycle allow scheduled overnight updates; VCC sense prevents partial writes during grid brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV160DB-70JC | 3.3V core with 5V I/O tolerance; 16Mbit density; CFI-compliant command set; different boot-block layout (top/bottom configurable). | Requires level-shifting for pure 5V systems; larger capacity may increase cost and PCB area where 1Mbit suffices. | Select if migrating to 3.3V platforms or needing CFI-standard toolchain compatibility. |
| SST39VF1601C-70-4C-EQE | 3.3V supply only; 16Mbit; single-power-supply operation; faster 70 ns read but no hardware boot-lock feature. | Lacks dedicated boot-block write protection - requires software-managed sector locking, increasing firmware complexity and risk. | Select for lower power consumption in battery-backed applications where boot security is handled in software. |
Compared with AM29LV160DB-70JC and SST39VF1601C-70-4C-EQE, the AT49F1025-70JI offers native 5V operation and hardware-enforced boot-block lockout - making it optimal for cost-sensitive, thermally demanding industrial designs where voltage translation and software-based protection are undesirable.
Availability
AT49F1025-70JI is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and energy metering applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AT49F1025-70JI 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) is a semiconductor manufacturer specializing in microcontrollers, Flash memory, and secure authentication ICs for embedded systems.
The AT49F1025 belongs to Atmel's 5V Flash memory product line, designed specifically for in-system reprogrammability in industrial and automotive applications where reliability, temperature resilience, and simple 5V-only command protocols are essential.
FAQ
What is the operating temperature range of the AT49F1025-70JI?
The AT49F1025-70JI is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the official Atmel ordering information table, where "JI" suffix denotes the industrial grade. The device maintains full functionality-including 70 ns read access, 10 µs word programming, and boot-block lockout-across this entire range, making it suitable for deployment in harsh environments such as factory floors, outdoor utility meters, and vehicle-mounted diagnostic tools. AT49F1025-70JI's thermal performance is validated per JEDEC JESD22-A108.
Does the AT49F1025-70JI require high-voltage programming signals?
No, the AT49F1025-70JI operates exclusively at 5V for both read and reprogramming functions. It uses internally generated high-voltage pulses triggered by standard 5V command sequences (e.g., AAh/55h/80h writes to 5555H/2AAA locations), eliminating the need for external 12V programming supplies. This 5V-only architecture simplifies power design and improves system safety. All programming, erasing, and boot-lock activation for AT49F1025-70JI are performed using standard logic-level signals compliant with TTL/CMOS thresholds.
How is boot block protection implemented in the AT49F1025-70JI?
The AT49F1025-70JI includes an 8K-word (0000H–1FFFH) boot block with hardware-enforced write lockout. Once enabled via a documented six-cycle command sequence (AAh→55h→80h→AAh→55h→40h), the boot block becomes permanently read-only - neither erasable nor programmable. Lockout status can be verified by reading I/O0 during software product identification mode. This feature ensures bootloader integrity in AT49F1025-70JI-based systems, preventing accidental corruption during field firmware updates while allowing main memory (56K words) to remain fully reprogrammable.
What package type does the AT49F1025-70JI use?
The AT49F1025-70JI uses a 44-lead Plastic J-Leaded Chip Carrier (PLCC) package, designated "44J" in Atmel's ordering information. Its dimensions conform to JEDEC MS-018AC: 16.5 mm × 16.5 mm body, 1.27 mm lead pitch, and J-shaped gull-wing leads. Pin 1 is identified by a corner chamfer and dot. This surface-mount package provides mechanical robustness and thermal performance suited for industrial reflow profiles. The AT49F1025-70JI's PLCC footprint differs from the VSOP package used in the AT49F1024 series, requiring distinct PCB layout.
How does the AT49F1025-70JI indicate completion of programming or erase operations?
The AT49F1025-70JI provides two hardware-supported methods: Data Polling on I/O7 (complement of last written data appears until operation completes) and Toggle Bit detection on I/O6 (toggles between 0/1 during active cycles, then stabilizes). Both methods allow the host processor to poll status without fixed delays. These features are integral to AT49F1025-70JI's command architecture and are validated across its full temperature range. No external status lines or interrupt signals are required - reducing system complexity and pin count.
AT49F1025-70JI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.6x16.6)
AT49F1025-70JI FAQ
1.How can I place an order for AT49F1025-70JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F1025-70JI 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 AT49F1025-70JI reliable?
The price and inventory of AT49F1025-70JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F1025-70JI is usually 5 days.
3.What payment methods are accepted for AT49F1025-70JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F1025-70JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F1025-70JI?
AT49F1025-70JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F1025-70JI 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 AT49F1025-70JI?
For technical support, including AT49F1025-70JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F1025-70JI requirements.
6.How does Aetrix verify that AT49F1025-70JI is sourced from the original manufacturer or authorized distributors?
All AT49F1025-70JI 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 AT49F1025-70JI meets industry standards.
7.What is the process for return or replacement of AT49F1025-70JI?
All AT49F1025-70JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F1025-70JI, 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 AT49F1025-70JI part is unused and in its original packaging.
Return procedure for AT49F1025-70JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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