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Microchip Technology AT29C1024-90JI
- Part No.:
- AT29C1024-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT29C1024-90JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT29C1024-90JI from Atmel is a 5-V-only, 1-Mbit (64K × 16) Flash memory IC designed for in-system reprogrammability in embedded controllers and firmware storage applications. It delivers 90 ns read access time, supports sector-based programming with 512 sectors (128 words/sector), and operates across industrial temperature range (–40°C to +85°C) with CMOS standby current <200 µA.
For engineers reviewing the AT29C1024-90JI datasheet, AT29C1024-90JI pinout, AT29C1024-90JI application, or AT29C1024-90JI equivalent, key selection criteria include its 5-V-only reprogramming architecture, hardware/software data protection, DATA polling and toggle-bit end-of-program detection, and PLCC-44 packaging for legacy board compatibility.
Technical Context
The AT29C1024-90JI implements a sector-erase-and-program architecture where each 128-word sector is internally latched before autonomous erase-and-write execution using an on-chip timer. Addressing uses A0–A15 for full 64K-word space, with A7–A15 selecting the target sector and A0–A6 specifying intra-sector word location.
It features dual data protection: hardware-level VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and CE/OE/WE state monitoring; plus software-level protection via three-step command sequences (e.g., 5555h/2AAAh/A0A0h) to enable/disable write lock. Product identification is accessible via hardware (A9 = 12 V) or software (5555h/2AAAh/9090h).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (64K × 16 words); enables firmware storage for mid-complexity microcontrollers without external address multiplexing. |
| Read Access Time | 90 ns max; ensures timing compliance with 11 MHz bus interfaces in industrial PLCs and instrumentation. |
| Supply Voltage | 5 V ± 10%; eliminates need for dedicated programming voltage rails-simplifies power design in 5-V systems. |
| Active Current | 60 mA typical; compatible with standard 5-V LDO regulators rated ≥100 mA. |
| Standby Current | 200 µA CMOS; supports low-power sleep modes in battery-backed or energy-constrained systems. |
| Endurance | >10,000 program/erase cycles per sector; sufficient for field-upgradable firmware with infrequent updates. |
| Operating Temp | –40°C to +85°C; qualified for industrial control cabinets, motor drives, and outdoor telemetry units. |
Pinout & Package
AT29C1024-90JI is packaged in a 44-lead Plastic J-Leaded Chip Carrier (PLCC-44), pin-compatible with JEDEC MS-018 AA standard. The package provides robust thermal performance and socket compatibility for in-circuit programming and rework.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus; A0–A6 select word within 128-word sector, A7–A15 select sector (0–511). |
| I/O0–I/O15 | Bidirectional Data Bus | 16-bit parallel interface; supports DATA polling on I/O7/I/O15 and toggle-bit detection on I/O6/I/O14. |
| CE | Chip Enable | Active-low chip select; must be low for read, program, or identification mode-enables multi-device bus sharing. |
| OE | Output Enable | Active-low output control; high-Z when high, prevents bus contention during shared-memory access. |
| WE | Write Enable | Active-low write strobe; initiates data load or program cycle; used with CE for software protection command sequencing. |
| VCC | Power Supply | +5 V ± 10% supply; powers core logic and I/O buffers-no auxiliary voltage required. |
| VSS | Ground | Two dedicated ground pins (pins 13 and 30 in PLCC) reduce ground bounce in high-speed reads. |
| NC / DC | No Connect / Don't Connect | Unbonded or reserved pins (e.g., pins 1, 8, 25, 31, 32, 44); must remain unconnected per design rules. |
Key Features
| Feature | Design Value |
|---|---|
| Single-Cycle Sector Program | Entire 128-word sector erased and programmed autonomously after data load-no external timing control needed. |
| DATA Polling & Toggle Bit | Real-time program status feedback via I/O7/I/O15 (complement read) or I/O6/I/O14 (toggle)-eliminates fixed delay waits. |
| Hardware Data Protection | VCC sense, 5 ms power-on delay, and noise filtering prevent spurious writes during brown-out or EMI events. |
| Software Data Protection | Three-command unlock sequence (e.g., 5555h/2AAAh/A0A0h) required before any sector program-prevents accidental firmware overwrite. |
| Product Identification Mode | Hardware (A9 = 12 V) or software (5555h/2AAAh/9090h) entry returns Manufacturer Code 1Fh and Device Code 25h-enables auto-detection in universal programmers. |
Applications
| Industrial Firmware Storage | Embedded Controller Boot Memory |
|---|---|
|
Use Scenario: Storing boot code and configuration parameters in programmable logic controllers (PLCs) operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile boot ROM providing deterministic 90 ns read access to initialization vectors and interrupt tables at system power-up. Use Value: Industrial temperature rating (–40°C to +85°C) and hardware write protection ensure reliable operation during voltage transients and thermal cycling. |
Use Scenario: Holding firmware images for 8/16-bit microcontrollers in HVAC control panels, where field updates are performed via RS-485 service port. IC Role / Device Role / Timing Role: In-system reprogrammable Flash memory enabling over-the-air or local firmware upgrades without removing the MCU. Use Value: Sector-based programming allows partial updates-only modified function blocks are rewritten, minimizing update time and wear. |
| Legacy Instrumentation Calibration Data | Telecom Line Card Configuration |
|
Use Scenario: Retaining calibrated sensor coefficients and linearization tables in portable multimeters and oscilloscopes subject to periodic recalibration. IC Role / Device Role / Timing Role: High-endurance nonvolatile storage for small, infrequently updated datasets requiring >10,000 write cycles over product lifetime. Use Value: >10,000 program/erase cycles per sector and 200 µA standby current extend battery life in handheld test equipment. |
Use Scenario: Storing line-card-specific configuration profiles (e.g., impedance settings, gain tables) in modular telecom chassis with hot-swap capability. IC Role / Device Role / Timing Role: Plug-and-play configuration memory accessed during card insertion to auto-configure FPGA or DSP peripherals. Use Value: PLCC-44 package enables socketed mounting for easy field replacement; software identification mode (1Fh/25h) supports automatic profile loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV160DB-90EC | 3.3 V core (with 5 V I/O tolerance); 16 Mbit density; 90 ns access; CFI-compliant command set. | Requires level-shifting in pure 5 V systems; suited for newer designs migrating to lower voltage. | Select if upgrading to 3.3 V infrastructure or needing larger capacity; not drop-in for AT29C1024-90JI's 5 V-only architecture. |
| SST39VF020-90-4C-NHE | 3.3 V supply only; 2 Mbit (128K × 16); 90 ns access; single-power-supply sector erase; no VCC sense protection. | Lacks hardware write inhibit during brown-out; requires external reset supervision for safe reprogramming. | Choose for cost-sensitive 3.3 V designs where industrial-grade voltage monitoring is handled externally. |
Compared with AM29LV160DB-90EC and SST39VF020-90-4C-NHE, the AT29C1024-90JI uniquely supports true 5 V-only operation with integrated VCC sense and noise filtering-critical for legacy industrial systems lacking auxiliary supervisors or level shifters.
Availability
AT29C1024-90JI is available at Aetrix Electronics and suitable for industrial control systems, embedded controller boot memory, and legacy instrumentation requiring stable component supply with long-term lifecycle support.
Supply support for AT29C1024-90JI 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 devices.
The AT29C1024-90JI belongs to Atmel's early-generation 5-V Flash memory family, engineered for reliable in-system reprogramming in industrial and automotive-adjacent applications where voltage stability and data integrity are critical.
FAQ
What is the maximum operating temperature range for the AT29C1024-90JI?
The AT29C1024-90JI is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "DC and AC Operating Range" table of the official datasheet, where the "-JI" suffix explicitly denotes the industrial grade. The device maintains full functionality-including 90 ns read access and sector programming-across this entire range, making it suitable for deployment in motor drives, factory automation hardware, and outdoor telemetry units.
Does the AT29C1024-90JI require a high-voltage programming signal?
No, the AT29C1024-90JI does not require high-voltage programming signals. It is a 5-V-only Flash memory: all operations-including read, sector program, and chip erase-are executed using standard 5 V ±10% supply and TTL/CMOS-compatible logic levels. Programming is initiated via specific address/data command sequences (e.g., 5555h/2AAAh/A0A0h), eliminating the need for 12 V or 12.5 V programming rails commonly found in older EPROMs or some EEPROMs.
How many sectors does the AT29C1024-90JI have, and what is the sector size?
The AT29C1024-90JI contains 512 sectors, each consisting of 128 words (256 bytes). This is explicitly stated in the "Features" section and confirmed in the "Device Operation" description: "512 Sectors (128 words/sector)". Each sector can be erased and programmed independently, and the sector address is selected using address bits A7–A15, while A0–A6 define the word offset within the sector.
What methods are available to detect the end of a program cycle on the AT29C1024-90JI?
The AT29C1024-90JI provides two hardware-supported methods: DATA polling and the Toggle Bit. For DATA polling, reading I/O7 or I/O15 returns the complement of the loaded data until programming completes, then returns true data. For Toggle Bit, repeated reads of any address cause I/O6 and I/O14 to toggle between 0 and 1 until completion. Both methods are fully documented in the "DATA POLLING" and "TOGGLE BIT" sections of the datasheet and require no external timers.
Is the AT29C1024-90JI pin-compatible with other packages of the same part number?
The AT29C1024-90JI specifically denotes the 44-lead PLCC (44J) package. While the same base part (AT29C1024-90) is also offered in TSOP-48 (e.g., AT29C1024-90TI), the pinouts differ significantly-PLCC uses dual-row J-leads with NC/DC pins at corners, while TSOP has gull-wing leads and different pin assignments for A12–A15, I/O lines, and VCC/VSS. Therefore, AT29C1024-90JI is not pin-compatible with TSOP variants; PCB layout and socketing must match the PLCC-44 footprint.
AT29C1024-90JI 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:
- 10ms
- Access Time:
- 90 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)
AT29C1024-90JI FAQ
1.How can I place an order for AT29C1024-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C1024-90JI 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 AT29C1024-90JI reliable?
The price and inventory of AT29C1024-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C1024-90JI is usually 5 days.
3.What payment methods are accepted for AT29C1024-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C1024-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C1024-90JI?
AT29C1024-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C1024-90JI 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 AT29C1024-90JI?
For technical support, including AT29C1024-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C1024-90JI requirements.
6.How does Aetrix verify that AT29C1024-90JI is sourced from the original manufacturer or authorized distributors?
All AT29C1024-90JI 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 AT29C1024-90JI meets industry standards.
7.What is the process for return or replacement of AT29C1024-90JI?
All AT29C1024-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT29C1024-90JI, 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 AT29C1024-90JI part is unused and in its original packaging.
Return procedure for AT29C1024-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29C1024-90JI Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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