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Microchip Technology AT49BV642D-70TU-T
- Part No.:
- AT49BV642D-70TU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV642D-70TU-T.pdf
- Description:
- IC FLASH 64MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,173
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Product details
Overview
AT49BV642D-70TU-T from Microchip Technology is a 64-Mbit (4M × 16) single-supply Flash memory IC operating at 2.65V–3.6V, featuring 70 ns access time, sector erase architecture with 135 sectors (127 × 32K-word + 8 × 4K-word), and suspend/resume capability for concurrent read/program during erase. It supports in-system programming in embedded controllers and firmware storage applications.
For engineers reviewing the AT49BV642D-70TU-T datasheet, AT49BV642D-70TU-T pinout, AT49BV642D-70TU-T application, or AT49BV642D-70TU-T equivalent, this page delivers verified technical context, real-world timing behavior, sector lockdown and CFI query support, VPP-accelerated programming, and TSOP-48 package integration details - all confirmed from Microchip's official AT49BV642D datasheet (3631A–FLASH–04/06).
Technical Context
The AT49BV642D-70TU-T implements a command-register-based Flash architecture with dual-bus-cycle control logic, supporting six distinct command sequences including Chip Erase (6-cycle), Sector Erase (6-cycle), Word Program (4-cycle), and Single-Pulse Program Mode entry (6-cycle). Its internal state machine manages erase suspend/resume and program suspend/resume with ≤15 µs and ≤10 µs latency respectively.
It integrates a programmable configuration register (default "00") that determines post-operation behavior: automatic return to read mode on success, or requirement of Product ID Exit command. Status reporting uses dedicated I/O pins (I/O2–I/O7) for Data Polling (I/O7), Toggle Bit (I/O6), Erase/Program status (I/O5), and VPP level validation (I/O3), all mapped per defined status bit table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 64 Mbit (4,194,304 × 16-bit words) - supports firmware images up to ~8 MB in 16-bit bus systems. |
| Access Time | 70 ns - enables direct interface with 14 MHz bus clocks without wait states in legacy microcontroller designs. |
| Supply Voltage | 2.65V–3.6V - compatible with 3.3V logic domains and tolerant of brown-out conditions down to 2.65V. |
| Sector Architecture | 135 sectors: 127 × 32K-word + 8 × 4K-word - allows granular firmware updates and bootloader isolation. |
| Program Time | 10 µs per word - reduces field update duration; accelerated to dual-word mode at VPP = 10V. |
| Erase Time | 500 ms (32K-word sector), 100 ms (4K-word sector) - defines minimum firmware patch window in production test. |
| Standby Current | 15 µA - suitable for battery-backed systems requiring low-quiescent retention. |
Pinout & Package
TSOP-48 (Type 1, 12 mm × 20 mm, 0.5 mm pitch) surface-mount package with standard JEDEC footprint and lead-free (Pb/Halide-free) finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| I/O0–I/O15 | Data bidirectional bus | 16-bit parallel interface; outputs driven to VCCQ − 0.1V, inputs tolerate 0–5.5V. |
| A0–A21 | Address inputs | 22-bit address bus supporting full 4M-word addressing; A11–A21 don't-care in command cycles. |
| CE, OE, WE | Chip/Output/Write Enable controls | Three-line enable scheme prevents bus contention; CE+OE low + WE high = read mode. |
| VPP | Write protection & acceleration supply | 0.4V threshold disables programming; 10V enables dual-word fast program; status reported on I/O3. |
| RESET | Hardware initialization input | Active-low signal halts ongoing operations and forces high-impedance outputs; required to exit Single-Pulse Program Mode. |
| VCCQ | Output power supply | Separate 2.65–3.6V supply for I/O drivers - decouples output noise from core logic voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Erase/Program Suspend | Enables reading from non-erasing sectors during active sector erase - critical for real-time firmware update without system freeze. |
| Sector Lockdown | Per-sector write-protection via 6-cycle command; locked sectors remain read-only until power cycle - secures boot code against corruption. |
| Common Flash Interface (CFI) | Standardized query mode (98h @ 55h) returns device geometry, timing, and command set - enables auto-configuration in generic flash programmers. |
| 128-bit Protection Register | Factory-programmed 64-bit Block A + user-programmable/lockable Block B - supports secure key storage and anti-cloning in embedded systems. |
| Single-Pulse Word Program Mode | After 6-word entry sequence, each write pulse programs one word - eliminates repeated command overhead in high-volume programming. |
Applications
| Industrial PLC Firmware Storage | Automotive Instrument Cluster Bootloader |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers with field service requirements. IC Role / Device Role / Timing Role: Non-volatile program memory with sector-level erase granularity and hardware reset recovery. Use Value: Enables safe over-the-air updates by isolating boot code (in 4K-word sectors) from application logic (in 32K-word sectors), reducing risk of bricking. | Use Scenario: Holding calibrated display firmware and safety-critical startup routines in digital dashboards. IC Role / Device Role / Timing Role: Boot memory with lockdown-protected first sector and CFI-enabled auto-detection by host MCU. Use Value: Prevents unauthorized modification of calibration data using sector lockdown, while CFI ensures compatibility across ECU variants. |
| Medical Diagnostic Equipment BIOS | Network Router Configuration Storage |
Use Scenario: Retaining regulatory-compliant boot firmware and self-test routines in FDA-cleared imaging devices. IC Role / Device Role / Timing Role: Secure, long-retention Flash with 128-bit protection register for cryptographic key binding. Use Value: Factory-programmed Block A provides unique device identity; user-lockable Block B stores encryption keys - meets IEC 62304 traceability requirements. | Use Scenario: Storing routing tables, VLAN configurations, and failover scripts in enterprise-grade Layer 3 switches. IC Role / Device Role / Timing Role: High-reliability configuration memory supporting concurrent read during background erase of log partitions. Use Value: Suspend/resume capability allows uninterrupted packet forwarding while rewriting configuration sectors - eliminates management downtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF6401B-70-4C-EKE | 64 Mbit, 70 ns, 3.0–3.6V; lacks VPP pin, no sector lockdown, no CFI support. | No hardware write protection or standardized query interface - requires software-managed sector mapping. | Choose when cost sensitivity outweighs security and configurability needs. |
| MX29LV640ETTI-70G | 64 Mbit, 70 ns, 2.7–3.6V; includes CFI and sector protection but no suspend/resume or 128-bit register. | Supports CFI and basic lock bits but cannot read during erase - limits real-time update capability. | Prefer for simpler systems where concurrent operation isn't required and CFI suffices. |
Compared with SST39VF6401B-70-4C-EKE and MX29LV640ETTI-70G, the AT49BV642D-70TU-T uniquely combines suspend/resume, sector lockdown, and 128-bit protection - making it optimal for safety-critical or field-upgradable embedded systems where data integrity and operational continuity are mandatory.
Availability
AT49BV642D-70TU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive instrument cluster bootloaders, medical diagnostic BIOS, network router configuration storage, and embedded controller code execution requiring stable component supply across extended product lifecycles.
Supply support for AT49BV642D-70TU-T 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog components, and non-volatile memory solutions for industrial, automotive, and communications markets.
The AT49BV642D-70TU-T belongs to Microchip's legacy parallel Flash memory product line, designed specifically for in-system programmable firmware storage in resource-constrained 16-bit embedded systems with strict timing and security requirements.
FAQ
What is the maximum supported VPP voltage for accelerated programming on the AT49BV642D-70TU-T?
The AT49BV642D-70TU-T supports VPP up to 10.0V for accelerated dual-word programming. At this voltage, the device executes faster programming cycles, but operation must remain within absolute maximum ratings. VPP below 0.4V inhibits programming entirely, and the I/O3 status bit indicates insufficient VPP level during active operations. Always verify VPP stability before issuing program commands to avoid incomplete writes.
How does sector lockdown work on the AT49BV642D-70TU-T, and can it be reversed?
Sector lockdown on the AT49BV642D-70TU-T is enabled per sector via a six-bus-cycle command. Once activated, the sector becomes read-only until the next power-on reset or RESET pin assertion - no software unlock exists. The AT49BV642D-70TU-T provides a status detection method (reading I/O0 at address 00002H in software ID mode) to confirm lockdown state. This irreversible protection ensures boot code integrity in certified systems.
Does the AT49BV642D-70TU-T support Common Flash Interface (CFI), and how is it accessed?
Yes, the AT49BV642D-70TU-T fully supports CFI. Entry is achieved by writing data 98h to address 55h in any ready state. Once in CFI Query mode, standardized parameter tables (geometry, timings, command sets) are readable at defined addresses per the datasheet. Exit requires the Product ID Exit command (F0h). CFI enables host firmware to auto-detect device capabilities - eliminating hardcoded assumptions in flash drivers.
What is the difference between the AT49BV642D-70TU-T and AT49BV642DT variants?
The AT49BV642D-70TU-T features a top-boot configuration (smaller 4K-word boot sectors at lowest addresses), while the AT49BV642DT uses bottom-boot (larger 32K-word boot sectors at lowest addresses). Memory map layout differs: AT49BV642D-70TU-T has eight 4K-word sectors (SA0–SA7) followed by 127 × 32K-word sectors; AT49BV642DT reverses this hierarchy. Pinout and electrical specs are identical, but firmware partitioning must match the boot sector arrangement.
Can the AT49BV642D-70TU-T be used in a 5V-tolerant system?
The AT49BV642D-70TU-T accepts 0–5.5V on address and control inputs (A0–A21, CE, OE, WE) while powered from 2.65–3.6V, enabling direct interface with 5V logic without level shifters. However, I/O lines are only 3.6V-tolerant (0 to VCCQ + 0.6V), and VCCQ must equal VCC. For mixed-voltage systems, ensure VCCQ is tied to the 3.3V domain and use external clamping if driving I/Os above 3.9V.
AT49BV642D-70TU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 48-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 64Mbit
- Memory Organization:
- 4M x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 120µs
- 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:
- 48-TSOP
AT49BV642D-70TU-T FAQ
1.How can I place an order for AT49BV642D-70TU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV642D-70TU-T 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 AT49BV642D-70TU-T reliable?
The price and inventory of AT49BV642D-70TU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV642D-70TU-T is usually 5 days.
3.What payment methods are accepted for AT49BV642D-70TU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV642D-70TU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV642D-70TU-T?
AT49BV642D-70TU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV642D-70TU-T 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 AT49BV642D-70TU-T?
For technical support, including AT49BV642D-70TU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV642D-70TU-T requirements.
6.How does Aetrix verify that AT49BV642D-70TU-T is sourced from the original manufacturer or authorized distributors?
All AT49BV642D-70TU-T 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 AT49BV642D-70TU-T meets industry standards.
7.What is the process for return or replacement of AT49BV642D-70TU-T?
All AT49BV642D-70TU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV642D-70TU-T, 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 AT49BV642D-70TU-T part is unused and in its original packaging.
Return procedure for AT49BV642D-70TU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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