My Inquiry
My Account
Microchip Technology AT49BV040A-70VI
- Part No.:
- AT49BV040A-70VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49BV040A-70VI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,763
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT49BV040A-70VI from Microchip Technology (formerly Atmel) is a 4 Mbit (512K × 8) single-supply, in-system reprogrammable Flash memory IC operating at 2.7–3.6 V. It delivers 70 ns read access time, 30 µs/byte programming, 7 s chip erase, and features hardware data protection, DATA polling, and toggle bit for cycle completion detection. It is used in embedded boot code storage and firmware update applications requiring reliable nonvolatile storage with sector-level erase control.
For engineers reviewing the AT49BV040A-70VI datasheet, AT49BV040A-70VI pinout, AT49BV040A-70VI application, or AT49BV040A-70VI equivalent, key selection considerations include its 32-pin VSOP package, boot block lockout capability (16 KB), sector architecture (1 boot + 2 parameter + 8 main blocks), CMOS standby current (50 µA), and compatibility with standard EPROM-like bus interface (CE/OE/WE).
Technical Context
The AT49BV040A-70VI implements a command-based flash architecture with internal program control and timer, supporting byte-by-byte programming and software-controlled sector or chip erase. Its memory array is partitioned into a 16 KB boot block (00000H–03FFFH), two 8 KB parameter blocks, and eight main memory blocks (one 32 KB + seven 64 KB), enabling selective firmware updates without disturbing secure boot code.
It uses standard microprocessor timing for command entry: six-cycle sequences for chip/sector erase and boot lockout enable, four-cycle for byte programming, and three-cycle for software product identification. Hardware protection includes VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibit (OE low, CE high, or WE high blocks writes).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (512K × 8), sufficient for compact boot loaders and configuration data in space-constrained designs. |
| Read Access Time | 70 ns - enables direct replacement of faster EPROMs in legacy 8-bit microcontroller systems without timing redesign. |
| Byte Programming Time | 30 µs typical - supports efficient field firmware patching with minimal system downtime per byte. |
| Chip Erase Time | 12 s max - allows full device reset during manufacturing or recovery, with boot block retention if lockout is enabled. |
| Standby Current | 50 µA CMOS - critical for battery-powered devices where low quiescent power extends operational life. |
| End-of-Write Detection | DATA polling (I/O7 complement) and toggle bit (I/O6 toggling) - eliminates need for fixed delay timers in host firmware. |
| Operating Voltage | 2.7–3.6 V - compatible with 3.3 V logic rails and single-cell Li-ion/Li-Po battery systems. |
| Endurance | 10,000 write/erase cycles - validated for industrial firmware update cycles over multi-year product lifetimes. |
Pinout & Package
AT49BV040A-70VI is housed in a 32-lead Very Small Outline Package (VSOP), 8 mm × 14 mm, compliant with JEDEC MO-142 Variation BA. Pin 1 identifier is marked on the top surface; leads are gull-wing, coplanarity ≤0.10 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A11 is don't-care in command cycles. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; I/O7 used for DATA polling, I/O6 for toggle bit status indication. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read access; controls latching in command sequences. |
| OE | Output Enable | Active-low output gate; high-Z when deasserted; required high during programming/erase to prevent bus contention. |
| WE | Write Enable | Active-low write strobe; falling edge latches address, rising edge latches data in command and programming cycles. |
| VCC | Power Supply | 2.7–3.6 V supply; internal voltage regulation ensures stable programming regardless of rail variation within range. |
| GND | Ground Reference | Signal and power ground; decoupling capacitor placement near this pin is mandatory for noise immunity during erase/write. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | 16 KB (00000H–03FFFH) permanently protected via 6-cycle command sequence - prevents accidental overwrite of secure boot code. |
| Sector-Erase Architecture | 11 independently erasable sectors (1 boot + 2 parameter + 8 main) - enables granular firmware updates without full chip erase. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibit - eliminates unintended writes due to power brownouts or EMI transients. |
| DATA Polling & Toggle Bit | Real-time, bus-compatible end-of-cycle detection using I/O7 and I/O6 - removes dependency on fixed timing delays in host controller firmware. |
| Green Packaging | Pb/Halide-free VSOP option - meets RoHS compliance requirements for industrial and consumer electronics without performance trade-offs. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Loader |
|---|---|
Use Scenario: Storing firmware images and calibration tables in programmable logic controllers deployed in factory automation environments with wide temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: Nonvolatile boot memory providing fast 70 ns read access to initialize CPU and load real-time control routines at power-up. Use Value: Sector erase capability allows field updates of control algorithms without disrupting boot code integrity, supported by 10,000-cycle endurance under repeated maintenance cycles. | Use Scenario: Hosting certified boot loader and safety-critical startup routines in portable diagnostic equipment requiring regulatory-compliant, tamper-resistant firmware storage. IC Role / Device Role / Timing Role: Secure boot memory with programmable lockout protecting 16 KB boot sector from unauthorized modification during service or upgrade. Use Value: Hardware data protection (VCC sense, noise filter) ensures no spurious writes occur during battery swaps or ESD events, meeting IEC 60601-1 reliability requirements. |
| Automotive Infotainment Configuration | Networking Equipment Parameter Storage |
Use Scenario: Retaining user preferences, display settings, and radio station presets in automotive head units operating across extended temperature ranges. IC Role / Device Role / Timing Role: Low-power (50 µA standby) Flash memory interfaced directly to 8-bit MCU via standard CE/OE/WE bus for seamless integration. Use Value: Two 8 KB parameter blocks allow atomic updates of configuration sets with zero risk of partial corruption, verified via DATA polling before commit. | Use Scenario: Storing MAC addresses, serial numbers, and calibration coefficients in Ethernet switches and routers during manufacturing and field servicing. IC Role / Device Role / Timing Role: In-system reprogrammable memory accessed as memory-mapped peripheral, supporting JTAG or UART-based firmware tools. Use Value: 30 µs/byte programming enables rapid population of unique identifiers during high-volume production, reducing test station dwell time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF400A-70-4C-NHE | 4 Mbit, 70 ns, 3.0–3.6 V; lacks boot block lockout; uses different command set (SST proprietary). | No hardware-enforced boot sector protection; requires firmware-level safeguards for secure boot code. | Choose when cost sensitivity outweighs need for hardware lockout and legacy Atmel command compatibility is not required. |
| MX29LV400CTTI-70G | 4 Mbit, 70 ns, 3.0–3.6 V; includes CFI-compliant command set; boot block size differs (8 KB vs. 16 KB). | CFI support simplifies driver portability but boot sector is smaller and not lockout-enabled by default. | Prefer for new designs targeting CFI-standardized toolchains, provided 8 KB boot space suffices and lockout is managed in software. |
Compared with SST39VF400A-70-4C-NHE and MX29LV400CTTI-70G, the AT49BV040A-70VI uniquely provides 16 KB hardware-lockable boot block, Atmel-specific command compatibility for legacy systems, and guaranteed 2.7 V minimum operation - making it optimal for industrial upgrades where boot integrity and low-voltage margin are design-critical.
Availability
AT49BV040A-70VI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot loader implementation, and automotive infotainment configuration requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for AT49BV040A-70VI 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
Microchip Technology acquired Atmel in 2016 and maintains full technical and supply chain support for legacy Atmel Flash products. The company specializes in microcontrollers, analog, Flash memory, and security ICs for industrial, automotive, and IoT markets.
The AT49BV040A product line was designed for embedded systems requiring in-system reprogrammable nonvolatile storage with robust data integrity, low-voltage operation, and sector-level flexibility - particularly in legacy 8-bit and 16-bit controller platforms.
FAQ
What is the operating voltage range for the AT49BV040A-70VI?
The AT49BV040A-70VI operates from 2.7 V to 3.6 V, enabling direct use with 3.3 V logic systems and single-cell lithium batteries. Its VCC sense circuitry disables programming below ~1.8 V, preventing corruption during brownout conditions. This voltage range is fully specified across the industrial temperature range (-40°C to +85°C), and the AT49BV040A-70VI maintains 70 ns read access and 30 µs byte programming across the entire range.
How does the boot block lockout feature work on the AT49BV040A-70VI?
The AT49BV040A-70VI boot block lockout is activated via a six-cycle command sequence (555H/AAH → AAH/55H → 555H/80H → 555H/AAH → AAH/55H → 555H/40H). Once enabled, the 16 KB boot sector (00000H–03FFFH) becomes permanently read-only - no erase or program commands affect it. The AT49BV040A-70VI supports software detection of lockout status by reading I/O0 at address 00002H in product ID mode, where high = locked.
Can the AT49BV040A-70VI be used as a direct replacement for standard EPROMs?
Yes, the AT49BV040A-70VI is pin- and command-compatible with standard 512K × 8 EPROMs in read mode: CE and OE low with WE high asserts data on I/O0–I/O7. Its 70 ns access time matches common EPROMs like the 27C4001, and it uses identical control signal timing. However, the AT49BV040A-70VI requires no UV erasure or external 12 V programming voltage - all operations execute with 3 V only, simplifying system design and eliminating UV window handling.
What are the valid package options for the AT49BV040A-70VI?
The AT49BV040A-70VI is specifically packaged in a 32-lead Very Small Outline Package (VSOP), 8 mm × 14 mm, per JEDEC MO-142 Variation BA. This differs from the PLCC (32J) and TSOP (32T) variants offered under other ordering codes (e.g., AT49BV040A-70JI, AT49BV040A-70TI). The VSOP footprint enables higher board density than PLCC and better thermal performance than standard TSOP in compact industrial modules.
How is end-of-program detection implemented in the AT49BV040A-70VI?
The AT49BV040A-70VI provides two hardware-supported methods: DATA polling and toggle bit. During programming, reading the last written byte returns the complement on I/O7 until completion, then true data. Alternatively, I/O6 toggles between 0 and 1 during active programming or erase; cessation of toggling signals completion. Both methods are bus-compatible and require no external timing components - the AT49BV040A-70VI handles all internal timing autonomously.
AT49BV040A-70VI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tray
- 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:
- 50µs
- Access Time:
- 70 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT49BV040A-70VI FAQ
1.How can I place an order for AT49BV040A-70VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV040A-70VI 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 AT49BV040A-70VI reliable?
The price and inventory of AT49BV040A-70VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV040A-70VI is usually 5 days.
3.What payment methods are accepted for AT49BV040A-70VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV040A-70VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV040A-70VI?
AT49BV040A-70VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV040A-70VI 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 AT49BV040A-70VI?
For technical support, including AT49BV040A-70VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV040A-70VI requirements.
6.How does Aetrix verify that AT49BV040A-70VI is sourced from the original manufacturer or authorized distributors?
All AT49BV040A-70VI 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 AT49BV040A-70VI meets industry standards.
7.What is the process for return or replacement of AT49BV040A-70VI?
All AT49BV040A-70VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV040A-70VI, 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 AT49BV040A-70VI part is unused and in its original packaging.
Return procedure for AT49BV040A-70VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49BV040A-70VI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
