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Microchip Technology AT45DB642-TC
- Part No.:
- AT45DB642-TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 40-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT45DB642-TC.pdf
- Description:
- IC FLASH 64MBIT PARALLEL 40TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,323
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Product details
Overview
AT45DB642-TC from Microchip Technology (formerly Atmel) is a 64-Mbit dual-interface DataFlash memory IC designed for embedded code shadowing, voice/image storage, and firmware update buffering. It features 8192 pages × 1056 bytes, two 1056-byte SRAM buffers, SPI/parallel interface support, and single 2.7–3.6V supply operation - enabling simultaneous data reception and flash reprogramming in DSP/microcontroller co-processor systems.
For engineers reviewing the AT45DB642-TC datasheet, AT45DB642-TC pinout, AT45DB642-TC application, or AT45DB642-TC equivalent, key selection criteria include page-level erase/program timing, continuous array read capability, hardware write protection (WP), RDY/BUSY status signaling, and SER/PAR interface mode control - all critical for real-time firmware patching and boot memory architectures.
Technical Context
The AT45DB642-TC implements a dual-path I/O architecture with independent serial (SPI Modes 0/3) and parallel (8-bit I/O0–I/O7) interfaces sharing SCK/CLK and controlled by SER/PAR. Its memory is organized into 8192 pages of 1056 bytes each, plus two dedicated 1056-byte SRAM buffers that operate concurrently with main array programming.
Page-level operations are self-timed: buffer-to-main-memory program with built-in erase completes in ≤ tEP, while page erase requires ≤ tPE. Status register bit 7 provides real-time RDY/BUSY polling, and hardware WP pin enables physical page write protection - eliminating software lock overhead in field-upgrade scenarios.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 64 Mbit (8,388,608 bytes), organized as 8192 × 1056-byte pages |
| Supply Voltage | 2.7V to 3.6V single supply - eliminates level-shifting in 3.3V systems |
| Serial Clock Max | 20 MHz - supports high-throughput firmware streaming via SPI |
| Parallel Clock Max | 5 MHz - enables burst transfers to microcontrollers with limited clock headroom |
| Active Read Current | 4 mA typical - reduces power budget impact during code shadowing |
| Standby Current | 2 µA typical - extends battery life in always-on embedded recorders |
| Interface Flexibility | Dual serial/parallel I/O with SER/PAR pin - allows runtime interface switching without reset |
Pinout & Package
AT45DB642-TC is housed in a 44-pin TSOP-I (Type 1) package with 0.8 mm pitch, compliant with JEDEC MO-141BA. Pin functions are electrically isolated between serial and parallel modes via SER/PAR control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for command decoding; must remain low during full instruction sequence |
| SCK/CLK | Shared Clock Input | Drives both serial and parallel interfaces; toggling loads opcodes, addresses, and data |
| SI | Serial Input | Valid only when SER/PAR = high; MSB-first input for opcodes, addresses, and buffer writes |
| SO | Serial Output | Valid only when SER/PAR = high; outputs status register, read data, and RDY/BUSY state |
| I/O7–I/O0 | Parallel I/O Bus | Valid only when SER/PAR = low; bidirectional 8-bit data path for fast buffer access |
| WP | Hardware Write Protect | Low-active pin disabling page programming - prevents accidental firmware corruption |
| RDY/BUSY | Status Output | Open-drain signal indicating internal operation progress; complements status register bit 7 |
| SER/PAR | Interface Mode Control | High = serial mode (SI/SO active); low = parallel mode (I/O7–I/O0 active); must be stable before CS assertion |
Key Features
| Feature | Design Value |
|---|---|
| Two 1056-byte SRAM Buffers | Enables pipelined operation: receive new data into one buffer while programming the other into flash - essential for uninterrupted audio/video streaming |
| Continuous Array Read | Single opcode + address initiates seamless sequential read across page boundaries - no CPU intervention needed for boot code execution |
| Self-timed Page Program with Erase | No external timing control required; erase+program completes in one atomic cycle (≤ tEP) - simplifies firmware update state machines |
| Hardware Page Write Protection | WP pin physically disables programming on selected pages - secures bootloader sectors against remote exploits |
| RDY/BUSY Pin + Status Register | Dual-status signaling allows either hardware interrupt-driven or software-polling flow control - adapts to real-time OS or bare-metal constraints |
Applications
| Boot Memory for ARM Cortex-M | Firmware Update Buffer |
|---|---|
Use Scenario: Storing and executing boot code for Cortex-M3/M4 microcontrollers requiring fast, reliable startup from external nonvolatile memory. IC Role / Device Role / Timing Role: Primary boot device providing continuous array read at 20 MHz to feed instruction cache; uses SER/PAR = high for SPI connection to MCU. Use Value: Eliminates need for external SRAM shadowing - direct XIP (execute-in-place) capability reduces BOM count and PCB area. | Use Scenario: Holding validated firmware images during over-the-air (OTA) updates in industrial gateways, allowing rollback if verification fails. IC Role / Device Role / Timing Role: Dual-buffered staging area where new firmware is written to buffer 1 while buffer 2 holds current image - switch occurs after full validation. Use Value: Atomic update guarantee: no partial writes or inconsistent states - critical for safety-critical edge devices. |
| Voice Recorder Storage | DSP Code/Data Buffer |
Use Scenario: Capturing and storing compressed voice clips in portable medical recorders with strict power budgets. IC Role / Device Role / Timing Role: Low-power storage element using 2 µA standby current and page-erase granularity to minimize wear on frequently overwritten segments. Use Value: Extends battery life >3× vs. standard NOR flash; selective page erasure preserves valid recordings during partial overwrite. | Use Scenario: Feeding real-time audio processing pipelines in telecom baseband units where DSPs require low-latency access to coefficient tables. IC Role / Device Role / Timing Role: Parallel-interface memory (SER/PAR = low) delivering 5 MHz burst reads to offload DSP internal RAM bandwidth. Use Value: Reduces DSP core stalls by 40% compared to serial-only access - measurable improvement in FFT throughput. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-interface flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT45DB642D-TC | Same pinout and electrical specs; updated revision with enhanced ESD tolerance (±4 kV HBM) | Preferred for new designs targeting IEC 61000-4-2 Level 3 compliance | Select AT45DB642D-TC for production builds requiring extended reliability certification |
| W25Q64JVSSIQ | Quad SPI only (no parallel interface); 64 Mbit density; 104 MHz QPI mode; no SRAM buffers | Suitable for space-constrained designs where serial bandwidth suffices and buffering logic is handled in MCU firmware | Choose W25Q64JVSSIQ only if parallel interface and concurrent buffer operation are not required |
Compared with AT45DB642-TC, AT45DB642D-TC offers backward-compatible reliability upgrades, while W25Q64JVSSIQ trades dual-interface flexibility and hardware buffering for higher serial throughput and smaller footprint - making it viable only when system architecture can absorb the loss of parallel access and pipelined buffering.
Availability
AT45DB642-TC is available at Aetrix Electronics and suitable for industrial gateways, medical voice recorders, automotive infotainment boot loaders, and DSP-based telecom equipment requiring stable component supply across multi-year production cycles.
Supply support for AT45DB642-TC 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 support for the DataFlash® product family, including long-term manufacturing commitment and technical documentation.
The AT45DB642-TC belongs to Microchip's legacy DataFlash line - engineered specifically for systems needing deterministic, low-pin-count, dual-mode nonvolatile storage with hardware-managed buffering and page-level granularity.
FAQ
What is the maximum clock frequency supported by AT45DB642-TC in serial interface mode?
The AT45DB642-TC supports up to 20 MHz on its SCK/CLK pin when operating in serial interface mode (SER/PAR = high). This timing is specified under VCC = 2.7–3.6V and TA = -40°C to +85°C. Exceeding this frequency may cause command decode failures or data corruption, as confirmed in the AC Characteristics table of the official datasheet (Rev. 1638F).
Does AT45DB642-TC support true byte-level writes like EEPROM?
No, AT45DB642-TC does not support true byte-level writes. It operates on 1056-byte pages: programming requires either full-page write (with built-in erase) or pre-erased page write. Bit/byte alteration requires software-managed Read-Modify-Write using the two SRAM buffers - a three-step process explicitly documented in the datasheet for EEPROM emulation.
How does the RDY/BUSY pin function during a Buffer-to-Main-Memory Page Program operation?
During a Buffer-to-Main-Memory Page Program operation, the RDY/BUSY pin goes low at CS rising edge and remains low for the entire self-timed duration (≤ tEP). It returns high only after successful completion, signaling readiness for the next command. This behavior is electrically identical to status register bit 7, providing hardware-level flow control independent of SPI communication.
Can AT45DB642-TC be used without connecting the parallel interface pins (I/O7–I/O0)?
Yes, AT45DB642-TC can be used exclusively in serial mode by tying SER/PAR high and leaving I/O7–I/O0 unconnected or floating (per datasheet recommendation). All functionality - including page read, buffer access, and status polling - remains fully operational via SI, SO, SCK/CLK, and CS. The parallel interface is optional and electrically disabled in this configuration.
What is the purpose of the SER/PAR pin, and what happens if it is left floating?
The SER/PAR pin selects active interface mode: high = serial (SI/SO), low = parallel (I/O7–I/O0). If left floating, the device enters an undefined state per datasheet - potentially causing bus contention or failed commands. Microchip specifies that SER/PAR must be actively driven to a valid logic level (VIL ≤ 0.2VCC or VIH ≥ 0.8VCC) before CS activation to ensure deterministic interface selection.
AT45DB642-TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 64Mbit
- Memory Organization:
- 1056 Bytes x 8192 pages
- Memory Interface:
- Parallel, SPI
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- 14ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TSOP
AT45DB642-TC FAQ
1.How can I place an order for AT45DB642-TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB642-TC 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 AT45DB642-TC reliable?
The price and inventory of AT45DB642-TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB642-TC is usually 5 days.
3.What payment methods are accepted for AT45DB642-TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB642-TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB642-TC?
AT45DB642-TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB642-TC 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 AT45DB642-TC?
For technical support, including AT45DB642-TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB642-TC requirements.
6.How does Aetrix verify that AT45DB642-TC is sourced from the original manufacturer or authorized distributors?
All AT45DB642-TC 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 AT45DB642-TC meets industry standards.
7.What is the process for return or replacement of AT45DB642-TC?
All AT45DB642-TC units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB642-TC, 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 AT45DB642-TC part is unused and in its original packaging.
Return procedure for AT45DB642-TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB642-TC Tags
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