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Microchip Technology AT29C040A-90JC
- Part No.:
- AT29C040A-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29C040A-90JC.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,085
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Product details
Overview
AT29C040A-90JC from Atmel is a 4-Mbit (512K × 8) 5-volt-only Flash memory IC organized in 2048 sectors of 256 bytes each, featuring 90 ns read access time, sector-based reprogramming, hardware/software data protection, and dual 16K-byte boot blocks with independent lockout - used for firmware storage and in-system updates in embedded controllers and industrial PLCs.
For engineers reviewing the AT29C040A-90JC datasheet, AT29C040A-90JC pinout, AT29C040A-90JC application, or AT29C040A-90JC equivalent, key selection considerations include sector erase granularity, 5V-only operation without high-voltage programming, DATA polling/Toggle Bit program status detection, boot block lockout for secure bootloader storage, and PLCC-32 packaging compatibility with legacy socketed designs.
Technical Context
The AT29C040A-90JC implements a sector-program architecture where each 256-byte sector is erased and programmed in a single internal cycle using an on-chip timer; address and data latches hold the full sector during load, freeing the bus for concurrent operations. It supports both CE- and WE-controlled byte loading with strict 150 µs inter-byte timing.
Its dual protection scheme combines hardware-level VCC sensing (<3.8 V inhibits programming), noise filtering (<15 ns pulse rejection), and software-controlled data protection via three-byte unlock sequences at fixed addresses (5555H/2AAAH); boot block lockout uses a seven-command enable algorithm and disables chip erase when activated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), sufficient for medium-complexity firmware images in microcontroller-based systems |
| Read Access Time | 90 ns - enables direct execution from flash in timing-critical 8-bit/16-bit embedded applications |
| Sector Size | 256 bytes - allows fine-grained firmware patching without erasing entire device |
| Program Cycle Time | 10 ms per sector - deterministic reprogramming latency for field-upgradeable systems |
| Endurance | >10,000 write/erase cycles per sector - supports frequent firmware updates over product lifetime |
| Supply Voltage | 5 V ± 10% - eliminates need for external voltage translators in legacy 5V logic environments |
| Standby Current | 100 µA (CMOS) - enables low-power retention in battery-backed or energy-sensitive applications |
| Operating Temp | 0°C to +70°C (Commercial) - validated for office, lab, and non-extreme industrial ambient conditions |
Pinout & Package
AT29C040A-90JC is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), pin-compatible with JEDEC MS-016 Variation AE, suitable for socketed or surface-mount assembly with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0–A7 select byte within 256-byte sector during programming |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit CMOS/TTL-compatible interface; I/O7 provides DATA polling feedback, I/O6 toggles during program/erase |
| CE | Chip Enable | Active-low global enable; must be low for read, program, or identification modes; high state forces outputs to high-Z |
| OE | Output Enable | Active-low read control; used with CE to prevent bus contention; must be high during programming |
| WE | Write Enable | Active-low programming control; initiates byte load or sector program; combined with CE for dual-trigger safety |
| VCC | Power Supply | +5 V ± 10% supply; internal VCC sense circuitry disables programming if voltage drops below ~3.8 V |
| GND | Ground Reference | Signal and power ground reference plane; required for stable read/write timing and noise immunity |
| NC | No Connect | Unbonded pin; must remain unconnected per design - no pull-up/down or routing allowed |
Key Features
| Feature | Design Value |
|---|---|
| Single-cycle sector erase & program | Eliminates separate erase command step - reduces firmware update complexity and host controller overhead |
| Hardware data protection | VCC sensing, 5 ms power-on delay, and noise filtering prevent spurious writes during brown-out or EMI events |
| Software data protection | Three-byte unlock sequence (5555H/2AAAH/A0H) required before any sector program - prevents accidental overwrites |
| Dual boot block lockout | Independent 16K-byte lockout for lower (0x00000–0x03FFF) and upper (0x7C000–0x7FFFF) memory regions - secures bootloader code |
| DATA polling & Toggle Bit | Real-time program status detection via I/O7 complement or I/O6 toggling - avoids fixed-timing delays in host firmware |
| Product identification mode | Hardware/software entry (5555H/2AAAH/90H) returns manufacturer code 1Fh and device code A4h - enables automatic density/sector-size detection |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Controller Bootloader |
|---|---|
Use Scenario: Storing and updating ladder logic programs and configuration data in programmable logic controllers operating in factory-floor environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with in-system reprogrammability; 90 ns access supports real-time scan-cycle execution without external wait states. Use Value: Sector-level updates allow patching of individual function blocks without full firmware reload; boot block lockout protects core runtime engine from corruption. | Use Scenario: Hosting boot code and initialization routines for 8051- or Z80-based industrial controllers where firmware resides entirely in external memory. IC Role / Device Role / Timing Role: Primary boot ROM replacement; 5V-only operation matches legacy CPU bus voltage; PLCC-32 fits existing sockets. Use Value: Dual 16K boot blocks support both low- and high-address boot modes; lockout ensures bootloader integrity across power cycles and field upgrades. |
| Medical Device Configuration Memory | Test Equipment Calibration Data Storage |
Use Scenario: Retaining user-configurable parameters (e.g., alarm thresholds, measurement units) and calibration coefficients in portable diagnostic instruments. IC Role / Device Role / Timing Role: Parameter EEPROM replacement; software data protection prevents unintended changes during clinical use. Use Value: >10,000 endurance cycles support daily recalibration; 100 µA standby current extends battery life in handheld units. | Use Scenario: Storing instrument-specific calibration constants and self-test results in automated test equipment requiring traceable, field-updatable references. IC Role / Device Role / Timing Role: Secure, versioned calibration data repository; chip identification mode enables auto-detection of memory density during calibration setup. Use Value: Product ID codes (1Fh/A4h) allow host software to validate correct AT29C040A-90JC presence; sector locking prevents overwrite of certified calibration data. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-90JC | 4 Mbit, 90 ns, 3.3 V/5 V tolerant; requires VPP = 12 V for program/erase; no boot block lockout | Lacks dedicated boot block protection; higher VPP requirement increases system complexity | Choose only if 3.3 V compatibility or extended temperature range (-40°C to +105°C) is mandatory |
| MX29LV040CTC-90G | 4 Mbit, 90 ns, 3 V core / 5 V I/O; supports CFI query; no software data protection or boot lockout | CFI interface enables generic flash drivers; lacks Atmel's dual-lockout and SDP features | Select when migrating to CFI-standard toolchains; verify bootloader security via external means |
Compared with AM29LV040B-90JC and MX29LV040CTC-90G, the AT29C040A-90JC uniquely delivers 5V-only operation with integrated boot block lockout and software data protection - critical for legacy 5V systems requiring tamper-resistant firmware storage without external high-voltage circuitry.
Availability
AT29C040A-90JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded controller bootloader deployment, and medical device configuration memory requiring stable component supply and long-term obsolescence management.
Supply support for AT29C040A-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, nonvolatile memory, and secure authentication ICs.
The AT29C040A-90JC belongs to Atmel's 5-volt-only Flash family designed for in-system programmability in cost-sensitive, legacy 5V embedded systems - prioritizing simplicity, reliability, and backward compatibility over low-voltage operation.
FAQ
What is the maximum operating temperature range for the AT29C040A-90JC?
The AT29C040A-90JC is rated for commercial operation from 0°C to +70°C. Its ordering code suffix "JC" explicitly denotes the commercial temperature grade; industrial-grade variants (e.g., AT29C040A-90JI) support –40°C to +85°C but are not applicable to this specific part number.
Does the AT29C040A-90JC require high-voltage programming signals?
No, the AT29C040A-90JC operates with 5 V ± 10% only - no external VPP or high-voltage programming signal is needed. Programming is enabled via standard 5V logic-level commands (e.g., 5555H/2AAAH sequences), making it compatible with simple microcontroller GPIO interfaces without charge pumps or voltage multipliers.
How does the boot block lockout feature work on the AT29C040A-90JC?
The AT29C040A-90JC contains two 16K-byte boot blocks - one at the lowest addresses (0x00000–0x03FFF) and one at the highest (0x7C000–0x7FFFF). Lockout is enabled independently per block using a seven-command algorithm; once set, those blocks become permanently read-only, and chip erase is disabled - ensuring bootloader integrity in the AT29C040A-90JC.
Can the AT29C040A-90JC be used in systems requiring more than 10,000 firmware updates?
The AT29C040A-90JC is specified for >10,000 write/erase cycles per sector. For systems requiring higher endurance, sector wear leveling must be implemented in host firmware. The AT29C040A-90JC itself does not include built-in wear leveling or ECC - those functions reside in the external controller managing the AT29C040A-90JC interface.
What package type is used for the AT29C040A-90JC?
The AT29C040A-90JC uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package, compliant with JEDEC MS-016 Variation AE. Its dimensions are 12.5 mm × 15.0 mm × 3.5 mm (max height), with J-shaped leads suitable for through-hole or surface-mount assembly using standard reflow profiles.
AT29C040A-90JC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- 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:
- 32-PLCC (13.97x11.43)
AT29C040A-90JC FAQ
1.How can I place an order for AT29C040A-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29C040A-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 AT29C040A-90JC reliable?
The price and inventory of AT29C040A-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29C040A-90JC is usually 5 days.
3.What payment methods are accepted for AT29C040A-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29C040A-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29C040A-90JC?
AT29C040A-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29C040A-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 AT29C040A-90JC?
For technical support, including AT29C040A-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29C040A-90JC requirements.
6.How does Aetrix verify that AT29C040A-90JC is sourced from the original manufacturer or authorized distributors?
All AT29C040A-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 AT29C040A-90JC meets industry standards.
7.What is the process for return or replacement of AT29C040A-90JC?
All AT29C040A-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT29C040A-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 AT29C040A-90JC part is unused and in its original packaging.
Return procedure for AT29C040A-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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