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Microchip Technology AT29C1024-90JC
- Part No.:
- AT29C1024-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT29C1024-90JC.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,794
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Product details
Overview
AT29C1024-90JC 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 features 70 ns read access time, sector-based programming with 512 sectors (128 words/sector), and hardware/software data protection. The device operates across commercial temperature range (0°C to 70°C) and draws only 60 mA active current and 200 µA CMOS standby current.
For engineers reviewing the AT29C1024-90JC datasheet, AT29C1024-90JC pinout, AT29C1024-90JC application, or AT29C1024-90JC equivalent, key selection criteria include 5V-only operation, sector erase granularity, DATA polling/toggle-bit program status detection, and PLCC-44 package compatibility with legacy board layouts.
Technical Context
The AT29C1024-90JC implements a sector-program architecture where each of its 512 sectors (128 words × 16 bits) is erased and programmed in a single internal cycle. Address latching occurs on falling CE or WE edges, with A7–A15 selecting the sector and A0–A6 selecting the word within it.
It supports dual program status detection: DATA polling on I/O7/I/O15 (complement-to-data during programming) and toggle-bit behavior on I/O6/I/O14. Hardware protection includes VCC sense (<3.8 V inhibits programming), 5 ms power-on delay, and noise filtering for sub-15 ns pulses on WE/CE.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (65,536 words × 16 bits) - supports firmware images up to 128 KB in 16-bit bus systems. |
| Read Access Time | 90 ns - ensures compatibility with 10 MHz microcontroller buses without wait states. |
| Supply Voltage | 5 V ± 10% - eliminates need for dedicated programming voltage; simplifies power design. |
| Sector Size | 128 words (256 bytes) - enables fine-grained firmware updates without full chip erase. |
| Program Cycle Time | 10 ms per sector - deterministic timing for host software timeout handling. |
| Endurance | >10,000 write/erase cycles per sector - suitable for field-upgradable control logic with infrequent updates. |
| Standby Current | 200 µA - enables low-power sleep modes in battery-backed systems. |
Pinout & Package
AT29C1024-90JC is packaged in a 44-lead Plastic J-Leaded Chip Carrier (PLCC-44), compliant with JEDEC MS-018 AA. Pin 1 is marked by a corner notch; leads are arranged in a square configuration with J-bend terminations for socket or surface-mount use.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus; A7–A15 select sector, A0–A6 select word within sector. |
| I/O0–I/O15 | Bidirectional Data Bus | 16-bit parallel interface; supports DATA polling on I/O7/I/O15 and toggle-bit on I/O6/I/O14. |
| CE | Chip Enable | Active-low chip select; must be low for read, program, or identification mode. |
| OE | Output Enable | Active-low output control; high-Z when high, enabling bus sharing. |
| WE | Write Enable | Active-low control for data loading and program initiation; used with CE for sector programming. |
| VCC | Power Supply | +5 V ± 10% supply; powers core logic and I/O drivers. |
| VSS | Ground | Two dedicated ground pins (pins 23 and 36) reduce noise coupling in high-speed reads. |
| NC / DC | No Connect / Don't Connect | Unbonded or internally unused pins (e.g., pins 1, 8, 25, 30, 31, 40, 43, 44); must remain floating. |
Key Features
| Feature | Design Value |
|---|---|
| Single-cycle sector erase & program | Eliminates separate erase step; reduces firmware update latency and host controller complexity. |
| Internal address/data latches for 128 words | Allows full sector data load before programming begins, freeing address/data bus for other tasks. |
| Hardware + software data protection | Prevents accidental writes via VCC sensing, noise filtering, and 3-word unlock sequence (AAh/55h/A0h). |
| DATA polling & toggle-bit status detection | Enables real-time program completion monitoring without external timers or busy-wait loops. |
| CMOS/TTL-compatible I/O | Interoperates with both 5 V CMOS and TTL logic families without level-shifting circuitry. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Code |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding executable code executed at power-on reset; accessed via 16-bit parallel bus. Use Value: Sector-level reprogramming allows field updates of individual function modules without erasing safety-critical configuration data stored in adjacent sectors. | Use Scenario: Holding certified boot firmware and diagnostic routines in Class II medical instruments requiring traceable, tamper-resistant code storage. IC Role / Device Role / Timing Role: Secure, write-protected firmware ROM with hardware VCC-sense and software lock to prevent unauthorized modification. Use Value: 200 µA standby current extends battery backup runtime; >10,000 endurance cycles support regulatory-mandated field calibration updates over 10+ year product life. |
| Automotive ECU Calibration Tables | Telecom Base Station Configuration |
Use Scenario: Storing engine calibration maps and emission control parameters in engine control units operating across -40°C to +85°C industrial range variants. IC Role / Device Role / Timing Role: Read-intensive memory with occasional sector updates during dealer reflash procedures; accessed via microcontroller's external memory interface. Use Value: 90 ns access time meets timing budgets of 10 MHz automotive MCUs; hardware data protection prevents corruption during vehicle battery transients. | Use Scenario: Retaining FPGA configuration bitstreams and protocol stack parameters in carrier-grade base station line cards subject to frequent remote updates. IC Role / Device Role / Timing Role: In-system programmable nonvolatile memory supporting hot-swap-capable field upgrades without chassis power-down. Use Value: PLCC-44 package enables socket-based replacement; sector programming minimizes service window duration during critical network maintenance windows. |
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; CFI-compliant command set; no hardware VCC sense. | Requires level-shifting for pure 5 V systems; larger capacity suits complex bootloaders but increases cost and footprint. | Select when migrating to lower-voltage platforms or needing CFI-standardized firmware tools. |
| MX29LV160CBTI-90G | 3.3 V supply only; 16 Mbit; supports both top/bottom boot-block architecture; lacks software data protection unlock sequence. | Not pin-compatible; incompatible voltage domain requires PCB redesign; boot-block layout differs from uniform sector map. | Choose for new designs prioritizing 3.3 V power efficiency and standardized boot-sector addressing. |
Compared with AM29LV160DB-90EC and MX29LV160CBTI-90G, the AT29C1024-90JC offers native 5 V operation, uniform 128-word sector structure, and dual hardware/software write protection-making it optimal for legacy 5 V embedded systems requiring drop-in firmware storage with robust inadvertent-write prevention.
Availability
AT29C1024-90JC is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostics equipment, and automotive ECUs requiring stable component supply, long-term obsolescence management, and verified legacy Flash memory sourcing.
Supply support for AT29C1024-90JC 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 fabless semiconductor company specializing in microcontrollers, Flash memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT29C1024 belongs to Atmel's early-generation 5 V Flash memory product line, engineered specifically for in-system reprogrammability in resource-constrained embedded systems using standard 5 V logic interfaces.
FAQ
What is the maximum operating frequency supported by the AT29C1024-90JC?
The AT29C1024-90JC does not operate at a clock frequency-it is an asynchronous parallel Flash memory. Its 90 ns read access time (tACC) supports reliable interfacing with microcontrollers running at up to approximately 10 MHz on their external bus, assuming zero wait-state timing. Actual maximum bus speed depends on system-level signal integrity, trace length, and controller setup/hold timing margins-not an internal clock.
Does the AT29C1024-90JC require a high-voltage programming signal?
No, the AT29C1024-90JC does not require high-voltage programming signals. It is a 5-V-only Flash memory: all programming and erase operations are performed using standard 5 V ± 10% VCC with command sequences issued on the data bus (e.g., AAh/55h/A0h). This eliminates the need for charge pumps or external 12 V supplies, simplifying system power design.
How many times can a sector of the AT29C1024-90JC be rewritten?
Each sector of the AT29C1024-90JC is rated for typical endurance of more than 10,000 write/erase cycles. This specification applies per sector-not per device-and is validated under standard operating conditions (VCC = 5 V ± 10%, TA = 25°C). Endurance may vary slightly across temperature and voltage extremes but remains sufficient for firmware update scenarios in industrial and automotive applications.
Can the AT29C1024-90JC be used in place of an EPROM like the 27C1024?
Yes, the AT29C1024-90JC is a functional and pin-compatible replacement for the 27C1024 EPROM in 5 V systems, offering identical 64K × 16 organization and PLCC-44 packaging. Unlike EPROMs, it supports in-system electrical erasure and reprogramming without UV exposure, eliminating the need for EPROM programmers or windowed packages-while maintaining read compatibility during normal operation.
What is the purpose of the NC and DC pins on the AT29C1024-90JC PLCC package?
The NC (No Connect) and DC (Don't Connect) pins on the AT29C1024-90JC PLCC-44 package are internally unbonded or reserved for future use. Per the datasheet, these pins-including pins 1, 8, 25, 30, 31, 40, 43, and 44-must remain unconnected and electrically floating. Connecting them to VCC, VSS, or any signal risks undefined behavior or device malfunction due to internal floating nodes.
AT29C1024-90JC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.6x16.6)
AT29C1024-90JC FAQ
1.How can I place an order for AT29C1024-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C1024-90JC 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 AT29C1024-90JC reliable?
The price and inventory of AT29C1024-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C1024-90JC is usually 5 days.
3.What payment methods are accepted for AT29C1024-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C1024-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C1024-90JC?
AT29C1024-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C1024-90JC 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 AT29C1024-90JC?
For technical support, including AT29C1024-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C1024-90JC requirements.
6.How does Aetrix verify that AT29C1024-90JC is sourced from the original manufacturer or authorized distributors?
All AT29C1024-90JC 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 AT29C1024-90JC meets industry standards.
7.What is the process for return or replacement of AT29C1024-90JC?
All AT29C1024-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C1024-90JC, 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 AT29C1024-90JC part is unused and in its original packaging.
Return procedure for AT29C1024-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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