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Microchip Technology AT29BV020-15JU
- Part No.:
- AT29BV020-15JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT29BV020-15JU.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,811
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Product details
Overview
AT29BV020-15JU from Atmel is a 2.7V-only, 2 Mbit (256K × 8) in-system Flash PEROM with 150 ns read access time, 20 ms max sector program cycle, and dual 8K-byte boot blocks featuring independent programming lockout. It operates across -40°C to +85°C and supports software data protection for secure reprogramming in embedded boot code storage applications.
For engineers reviewing the AT29BV020-15JU datasheet, AT29BV020-15JU pinout, AT29BV020-15JU application, or AT29BV020-15JU equivalent, key selection criteria include single-supply 2.7–3.6V operation, sector-based 256-byte programming with DATA polling/toggle-bit status detection, CMOS/TTL I/O compatibility, and PLCC-32 packaging for legacy industrial control and firmware storage designs.
Technical Context
The AT29BV020-15JU implements a sector-erase-and-program architecture where each of 1024 sectors (256 bytes/sector) is erased and programmed in a single internal cycle. Address latching occurs on falling CE or WE edges, with A8–A17 selecting the sector and A0–A7 selecting the byte within it.
It features dual hardware/software protection: VCC sense inhibits programming below 2.0V, and a three-byte unlock sequence (AAh→55h→A0h) must precede every sector load. Boot block lockout is enabled via a seven-command algorithm and disables chip erase when activated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), enabling full firmware image storage for 8-bit microcontrollers |
| Read Access Time | 150 ns max - meets timing requirements for 6.67 MHz bus interfaces without wait states |
| Supply Voltage | 2.7V–3.6V single supply - compatible with battery-backed or low-voltage industrial rails |
| Active Current | 15 mA at 3.6V/5 MHz - enables low-power operation in always-on embedded systems |
| Standby Current | 50 µA CMOS standby - supports long-term retention in sleep-mode applications |
| Sector Size | 256 bytes per sector - allows fine-grained firmware updates without erasing entire memory |
| Endurance | >10,000 write/erase cycles per sector - sufficient for field-upgradable bootloader implementations |
Pinout & Package
AT29BV020-15JU is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), JEDEC MS-016 variation AE, with 12.32 mm × 14.86 mm body size, 1.27 mm lead pitch, and pin 1 identifier corner marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A7 select byte within sector, A8–A17 select sector |
| I/O0–I/O7 | Bidirectional Data Bus | CMOS/TTL-compatible 8-bit data path for read/write; supports DATA polling on I/O7 and toggle-bit detection on I/O6 |
| CE | Chip Enable | Active-low chip select; must be low for read or write; used with WE for byte-load initiation |
| OE | Output Enable | Active-low output control; high-Z state prevents bus contention during deselect |
| WE | Write Enable | Active-low write strobe; falling edge latches address/data during sector programming |
| NC | No Connect | Pin 16 (PLCC top view) is unconnected - no routing or termination required |
| VCC | Power Supply | 2.7–3.6V supply input; internal VCC sense circuitry disables programming if voltage drops below 2.0V |
| GND | Ground | Reference return for all signals; decoupling capacitor placement critical for stable 150 ns read timing |
Key Features
| Feature | Design Value |
|---|---|
| Software Data Protection | Three-byte unlock sequence (5555h/2AAAh/5555h) required before every sector program - prevents accidental firmware corruption |
| Dual Boot Block Lockout | Independent 8K-byte lockout for lower (0000h–1FFFh) and upper (38000h–3FFFFh) memory regions - secures bootloader and recovery code |
| DATA Polling & Toggle Bit | I/O7 complement indicates active programming; I/O6 toggling provides asynchronous status - eliminates need for fixed delay timers in host firmware |
| Internal Program Control | On-chip timer and erase-then-program logic - relieves host MCU of timing-critical sequencing and voltage management |
| Green Packaging | Pb/Halide-free PLCC-32 package - compliant with RoHS Directive 2011/65/EU for industrial equipment shipments |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded Bootloader |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory automation environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage device providing direct x8 bus interface to 8-bit/16-bit MCUs; delivers 150 ns read access to sustain deterministic scan-cycle execution. Use Value: Dual boot blocks allow safe field updates: primary firmware runs from unlocked sector while new version is written to locked backup region, enabling atomic rollback on failure. | Use Scenario: Hosting boot code for microcontrollers in medical diagnostic instruments requiring certified firmware integrity and long-term data retention. IC Role / Device Role / Timing Role: Boot ROM replacement with in-system reprogrammability; operates as memory-mapped peripheral with CE/OE/WE control matching standard EPROM timing. Use Value: Software lockout prevents unauthorized modification of safety-critical startup routines, while 10,000-cycle endurance supports lifetime calibration updates without hardware replacement. |
| Point-of-Sale Terminal BIOS | Telecom Line Card Configuration |
Use Scenario: Storing BIOS and peripheral driver modules in retail POS terminals subject to frequent software upgrades and power-loss events. IC Role / Device Role / Timing Role: Sector-erasable Flash memory interfaced to Z80 or 8051 derivatives; uses DATA polling to synchronize host writes without external timing components. Use Value: 256-byte sector granularity enables partial updates of driver tables without disrupting operational transaction firmware, minimizing downtime during maintenance. | Use Scenario: Holding configuration profiles and protocol stacks for modular telecom line cards operating in carrier-grade central office environments. IC Role / Device Role / Timing Role: Firmware storage element with industrial temperature rating (-40°C to +85°C); supports hot-swap-aware programming via WE-controlled byte loads. Use Value: CMOS standby current of 50 µA permits low-power retention during card standby, while 2.7–3.6V supply range aligns with distributed 3.3V backplane power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT29LV020-15JU | Same density and pinout, but 3.0V–3.6V only supply range - lacks 2.7V operation | Not suitable for battery-powered or brown-out-prone systems requiring true 2.7V functionality | Select AT29BV020-15JU when 2.7V minimum operation is mandatory; AT29LV020-15JU offers tighter VCC tolerance in stable 3.3V rails |
| MX29LV020C-15J | 2 Mbit Flash in PLCC-32, 150 ns access, but uses different unlock sequence (AAh/55h/80h) and lacks boot block lockout | Requires modified host driver for programming; no hardware-enforced bootloader protection | Choose MX29LV020C-15J only if existing design already uses Macronix command set and boot security is handled externally |
Compared with AT29LV020-15JU and MX29LV020C-15J, the AT29BV020-15JU uniquely supports true 2.7V operation and integrated boot block lockout - critical for battery-backed and safety-certified applications where voltage margin and firmware immutability are design requirements.
Availability
AT29BV020-15JU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded bootloader implementation, and telecom line card configuration requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT29BV020-15JU 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 and automotive markets.
The AT29BV020-15JU belongs to Atmel's Low Voltage Flash family, designed specifically for in-system reprogrammable firmware storage in resource-constrained 8-bit embedded systems requiring robust data retention and simple command-set integration.
FAQ
What is the minimum supply voltage required for reliable operation of the AT29BV020-15JU?
The AT29BV020-15JU requires a minimum supply voltage of 2.7V for guaranteed read and write functionality across its full industrial temperature range (-40°C to +85°C). Below 2.0V, internal VCC sense circuitry disables programming entirely to prevent data corruption, and the device enters a high-impedance state. This 2.7V lower limit makes the AT29BV020-15JU suitable for battery-powered or brown-out-prone applications where other 3.3V Flash devices would fail.
How does the software data protection feature work on the AT29BV020-15JU?
The AT29BV020-15JU implements a mandatory three-byte unlock sequence (AAh to address 5555h, 55h to address 2AAAh, then A0h to address 5555h) before any sector programming can begin. This sequence must be repeated for every sector load. The AT29BV020-15JU validates the pattern internally and only enables the write latch after successful recognition - preventing accidental overwrites from noise, glitches, or erroneous host commands. Power transitions do not reset this protection state.
Can the AT29BV020-15JU be used as a direct replacement for standard EPROMs like the 27C256?
Yes, the AT29BV020-15JU is pin-compatible and functionally compatible with 27C256 EPROMs in read mode: CE and OE low with WE high asserts data on I/O0–I/O7 with identical timing. However, unlike EPROMs, the AT29BV020-15JU supports in-system reprogramming via software commands and requires no UV erasure. Its 150 ns access time matches typical 27C256-15 devices, making it a drop-in upgrade for legacy designs needing field-upgradable firmware.
What is the purpose of the two boot blocks in the AT29BV020-15JU, and how is lockout enabled?
The AT29BV020-15JU contains two dedicated 8K-byte boot blocks - one at the lowest addresses (0000h–1FFFh) and one at the highest (38000h–3FFFFh) - to store immutable bootloader code. Lockout is enabled independently for each block using a seven-command algorithm that writes specific values to fixed addresses. Once activated, the locked block cannot be erased or programmed, even by chip erase, ensuring bootloader integrity. The AT29BV020-15JU supports software detection of lockout status via reads from 00002h and 3FFF2h.
Does the AT29BV020-15JU support chip-level erase, and what happens if boot blocks are locked?
The AT29BV020-15JU supports optional software chip erase using a six-byte command sequence. However, if either boot block programming lockout feature has been activated, the chip erase function is permanently disabled - a hardware-enforced safeguard to prevent accidental deletion of secured bootloader code. In such cases, only sector-level erasure remains available. This behavior is intrinsic to the AT29BV020-15JU silicon design and cannot be overridden by command or voltage manipulation.
AT29BV020-15JU 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:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 20ms
- Access Time:
- 150 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT29BV020-15JU FAQ
1.How can I place an order for AT29BV020-15JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT29BV020-15JU 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 AT29BV020-15JU reliable?
The price and inventory of AT29BV020-15JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT29BV020-15JU is usually 5 days.
3.What payment methods are accepted for AT29BV020-15JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT29BV020-15JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT29BV020-15JU?
AT29BV020-15JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT29BV020-15JU 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 AT29BV020-15JU?
For technical support, including AT29BV020-15JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT29BV020-15JU requirements.
6.How does Aetrix verify that AT29BV020-15JU is sourced from the original manufacturer or authorized distributors?
All AT29BV020-15JU 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 AT29BV020-15JU meets industry standards.
7.What is the process for return or replacement of AT29BV020-15JU?
All AT29BV020-15JU units undergo pre-shipment inspection (PSI). If there is an issue with AT29BV020-15JU, 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 AT29BV020-15JU part is unused and in its original packaging.
Return procedure for AT29BV020-15JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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