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Microchip Technology AT29LV1024-20JI
- Part No.:
- AT29LV1024-20JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AT29LV1024-20JI.pdf
- Description:
- IC FLASH 1MBIT PARALLEL 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,080
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Product details
Overview
AT29LV1024-20JI from Atmel is a 1 Mbit (64K × 16) 3.3V-only Flash memory IC with 200 ns read access time, 512 sectors × 128 words, and software-controlled sector erase/program. It operates across -40°C to +85°C and supports in-system reprogramming without high-voltage programming signals - used in embedded firmware storage for industrial controllers and legacy system BIOS updates.
For engineers reviewing the AT29LV1024-20JI datasheet, AT29LV1024-20JI pinout, AT29LV1024-20JI application, or AT29LV1024-20JI equivalent, key selection criteria include sector-based reprogrammability, DATA polling/toggle-bit program status detection, 3.3V-only operation, CMOS standby current <100 µA, and PLCC-44 industrial-temperature packaging.
Technical Context
The AT29LV1024-20JI implements a sector-erase architecture where each of its 512 sectors (128 words × 16 bits) is independently programmable via a three-command software unlock sequence. Internal latching allows address/data bus release during internal 20 ms erase-and-program cycles.
It features dual program status detection: DATA polling on I/O7/I/O15 outputs complemented data until completion, and toggle-bit behavior on I/O6/I/O14 during active programming. Hardware protections include VCC sense (<1.8V inhibit), 10 ms power-on delay, and noise filtering for WE/CE pulses <15 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 1 Mbit (64K × 16 words), enabling firmware storage for 8-bit/16-bit microcontrollers without external data widening. |
| Read Access Time | 200 ns max - meets timing requirements for 5 MHz bus interfaces in legacy industrial PLCs and communication modules. |
| Supply Voltage | 3.3V ± 0.3V only - eliminates need for 5V/12V programming supplies; compatible with modern low-voltage logic families. |
| Standby Current | 100 µA max at -40°C to +85°C - supports low-power sleep modes in battery-backed or energy-constrained systems. |
| Sector Program Time | 20 ms typical per 128-word sector - enables field-upgradable firmware patches without full-chip erase delays. |
| Endurance | >10,000 program/erase cycles per sector - sufficient for infrequent configuration updates in industrial HMI or sensor calibration tables. |
| Input Compatibility | CMOS/TTL-compatible I/O with 0–5.5V address/control inputs - allows direct interfacing with mixed-voltage 5V microcontrollers. |
Pinout & Package
AT29LV1024-20JI is packaged in a 44-lead Plastic J-Leaded Chip Carrier (PLCC-44), pin-compatible with JEDEC MS-018 AC standard. The package supports socketed insertion for in-circuit reprogramming and provides thermal robustness for industrial ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A15 | Address Inputs | 16-bit address bus supporting full 64K-word addressing; A7–A15 define sector, A0–A6 define intra-sector word. |
| I/O0–I/O15 | Bidirectional Data Bus | 16-bit parallel data path; I/O6/I/O14 provide toggle-bit status, I/O7/I/O15 support DATA polling. |
| CE | Chip Enable | Active-low chip select; must be low for read/write; high forces outputs to high-impedance state to prevent bus contention. |
| OE | Output Enable | Active-low output control; used with CE to gate read data; held high during programming to enable write mode. |
| WE | Write Enable | Active-low write strobe; falling edge latches address/data during sector load; controls timing of 150 µs word load window. |
| VCC / VSS | Power / Ground | Single 3.3V supply; VSS pins (pins 13, 27, 39) provide dedicated ground returns for signal integrity. |
| NC / DC | No Connect / Don't Connect | Non-functional pins (e.g., pins 1, 5, 6, 12, 17, 20, 21, 25, 26, 32, 33, 40, 41, 42, 43, 44); must remain unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-command unlock sequence (5555h/2AAAh/A0A0h) prevents accidental writes - critical for field-deployed firmware integrity. |
| Internal Sector Erase | Automatic erase before programming eliminates separate erase command - simplifies host firmware and reduces update latency. |
| DATA Polling & Toggle Bit | Dual, hardware-verified program status detection methods allow flexible polling strategies without external timers or interrupts. |
| Hardware Program Inhibit | VCC sense, 10 ms power-on delay, and noise filtering ensure immunity to brown-out or EMI-induced spurious writes. |
| Product Identification Mode | Software-accessible manufacturer code (1Fh) and device code (26h) enable runtime part verification and density-agnostic bootloader design. |
Applications
| Industrial PLC Firmware Storage | Legacy Communication Module Boot Code |
|---|---|
|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers operating in harsh factory environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Nonvolatile boot memory providing 16-bit parallel access to microcontroller during cold start and field firmware updates. Use Value: Sector-level reprogrammability enables patch deployment without full-chip erase; 100 µA standby current extends uptime in battery-buffered systems. |
Use Scenario: Holding boot loader and protocol stack binaries in RS-485/Modbus gateways with long product lifecycles and infrequent field upgrades. IC Role / Device Role / Timing Role: In-system programmable Flash memory interfaced directly to 8051 or Z80 derivatives via standard address/data bus. Use Value: 200 ns read access satisfies 5 MHz bus timing; software identification codes allow single-board support for multiple density variants. |
| Embedded HMI Configuration Memory | Test Equipment Calibration Table Storage |
|
Use Scenario: Retaining user interface language packs, screen layouts, and operational settings in human-machine interface panels deployed in manufacturing lines. IC Role / Device Role / Timing Role: Read-mostly nonvolatile storage accessed during GUI initialization and updated only during maintenance sessions. Use Value: >10,000 endurance cycles accommodate years of calibration or localization updates; PLCC-44 package enables socketed replacement for serviceability. |
Use Scenario: Storing temperature-compensated ADC calibration coefficients and sensor linearization tables in benchtop multimeters and signal analyzers. IC Role / Device Role / Timing Role: Sector-locked parameter memory where individual 128-word sectors are written once per calibration cycle. Use Value: DATA polling ensures deterministic write completion detection; 3.3V-only operation simplifies power domain design alongside precision analog front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV1024-200EC | AMD part; 200 ns access, 3.3V, 44-pin PLCC, but requires different software unlock sequence (AAh/55h/A0h) and lacks toggle-bit status. | Same industrial temperature range and sector size, but firmware driver changes required for unlock and status polling. | Select when existing AMD ecosystem tooling or qualification is mandated; verify bootloader compatibility with unlock timing. |
| SST39VF100-200-4C-NHE | Microchip (SST) part; 200 ns, 3.3V, 44-pin PLCC, supports byte/word programming (not sector-only), and uses different ID codes (BFh/29h). | Enables partial-word updates without sector erase - useful for dynamic parameter logging, but increases complexity for bulk firmware loads. | Prefer for applications requiring frequent small-data writes; confirm SST-specific command set integration in host firmware. |
Compared with AM29LV1024-200EC and SST39VF100-200-4C-NHE, the AT29LV1024-20JI offers deterministic sector-erase timing and unified toggle-bit/DATA polling, reducing host-side polling overhead and simplifying validation for fixed-firmware industrial deployments.
Availability
AT29LV1024-20JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy communication module boot code, and embedded HMI configuration memory requiring stable component supply across extended product lifecycles.
Supply support for AT29LV1024-20JI 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 AT29LV1024 product line delivers 3.3V-only Flash memory optimized for in-system reprogrammability in space-constrained, thermally demanding embedded applications - targeting legacy system upgrades and long-lifecycle industrial equipment.
FAQ
What is the operating temperature range for the AT29LV1024-20JI?
The AT29LV1024-20JI is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the Ordering Information table (page 10) and applies specifically to the "-JI" suffix variant. The device maintains full functionality-including 200 ns read access, 100 µA standby current, and reliable sector programming-across this full range, making it suitable for deployment in factory automation and outdoor infrastructure equipment where ambient temperatures fluctuate widely. AT29LV1024-20JI's thermal performance is validated per JEDEC JESD22-A104 reliability testing.
Does the AT29LV1024-20JI require high-voltage programming signals?
No, the AT29LV1024-20JI operates with 3.3V-only programming - no 12V or 5V auxiliary supplies are needed. Programming is enabled solely through a three-command software unlock sequence (5555h/2AAAh/A0A0h) applied to the address/data bus, followed by sector data loading. This eliminates external voltage translators and simplifies PCB layout. Hardware protections - including VCC sense below 1.8V and 10 ms power-on delay - ensure that inadvertent writes cannot occur during power ramp-up or brown-out conditions. AT29LV1024-20JI's architecture was explicitly designed for safe in-system reprogramming.
How does program status detection work on the AT29LV1024-20JI?
The AT29LV1024-20JI provides two independent, hardware-verified methods: DATA polling and toggle-bit detection. During programming, reading the last loaded word returns complemented data on I/O7 and I/O15 until completion; true data appears immediately after finish. Simultaneously, I/O6 and I/O14 toggle between 0 and 1 during active programming and stabilize upon completion. Both methods can be polled at any time - no external timer or interrupt is required. This dual-mechanism design gives firmware developers flexibility: DATA polling suits simple polling loops, while toggle-bit detection works well with state machines or DMA-driven status checks. AT29LV1024-20JI's status signals are fully specified in the Data Polling and Toggle Bit Characteristics tables (pages 8–9).
What package type is used for the AT29LV1024-20JI?
The AT29LV1024-20JI uses a 44-lead Plastic J-Leaded Chip Carrier (PLCC-44), conforming to JEDEC MS-018 AC standard. Its dimensions are 16.7 mm × 16.7 mm × 4.57 mm (max height), with gull-wing leads enabling socketed insertion for field reprogramming and repair. Pin 1 is marked by a corner notch, and the package includes 3 dedicated VSS pins (13, 27, 39) for low-noise grounding. This PLCC variant is distinct from the TSOP-48 option (e.g., AT29LV1024-20TI) and is selected specifically for industrial applications requiring mechanical robustness and thermal cycling resilience. AT29LV1024-20JI's package drawing is detailed on page 11 of the datasheet.
Can the AT29LV1024-20JI be used with 5V microcontrollers?
Yes - the AT29LV1024-20JI's address and control inputs (A0–A15, CE, OE, WE) tolerate 0–5.5V, allowing direct connection to 5V TTL or CMOS microcontrollers without level shifters. Its I/O lines operate at 0–3.6V, so bidirectional data transfer requires either a 3.3V-tolerant MCU port or external level translation for write operations. Many legacy 8051 and Z80 designs use this compatibility to retain existing 5V logic while migrating to 3.3V Flash. Input thresholds (VIL = 0.6V, VIH = 2.0V) ensure reliable recognition of 5V logic levels. AT29LV1024-20JI's input voltage tolerance is explicitly stated in the "INPUT LEVELS" section (page 3) and verified in DC Characteristics (page 4).
AT29LV1024-20JI 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:
- 20ms
- Access Time:
- 200 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.6x16.6)
AT29LV1024-20JI FAQ
1.How can I place an order for AT29LV1024-20JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29LV1024-20JI 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 AT29LV1024-20JI reliable?
The price and inventory of AT29LV1024-20JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29LV1024-20JI is usually 5 days.
3.What payment methods are accepted for AT29LV1024-20JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29LV1024-20JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29LV1024-20JI?
AT29LV1024-20JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29LV1024-20JI 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 AT29LV1024-20JI?
For technical support, including AT29LV1024-20JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29LV1024-20JI requirements.
6.How does Aetrix verify that AT29LV1024-20JI is sourced from the original manufacturer or authorized distributors?
All AT29LV1024-20JI 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 AT29LV1024-20JI meets industry standards.
7.What is the process for return or replacement of AT29LV1024-20JI?
All AT29LV1024-20JI units undergo pre-shipment inspection (PSI). If there is an issue with AT29LV1024-20JI, 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 AT29LV1024-20JI part is unused and in its original packaging.
Return procedure for AT29LV1024-20JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT29LV1024-20JI Tags
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