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Microchip Technology AT25320-10PC
- Part No.:
- AT25320-10PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AT25320-10PC.pdf
- Description:
- IC EEPROM 32KBIT SPI 3MHZ 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,775
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Product details
Overview
AT25320-10PC from Atmel is a 32-Kbit (4096 × 8) SPI serial EEPROM with 2.7–5.5 V operation, 3 MHz clock rate at 5 V, 32-byte page write capability, and hardware/software write protection via WP pin and status register. It serves as nonvolatile configuration storage in microcontroller-based industrial control modules requiring reliable low-voltage data retention.
For engineers reviewing the AT25320-10PC datasheet, AT25320-10PC pinout, AT25320-10PC application, or AT25320-10PC equivalent, key selection criteria include its 10 ms max write cycle time, -40°C to +85°C industrial temperature grade, 8-pin PDIP package, block write protection granularity (1/4, 1/2, or full array), and SPI Mode 0/3 compatibility with legacy MCU peripherals.
Technical Context
The AT25320-10PC operates as a slave device on a 3-wire SPI bus (CS, SCK, SI/SO), supporting MSB-first transmission and requiring WREN before WRITE. Its internal architecture includes an 8-bit instruction register, nonvolatile status register (WPEN, BP1/BP0, WEN, RDY), and automatic address incrementing during sequential reads.
Write operations are self-timed with no external erase step; the HOLD pin suspends ongoing transfers without resetting sequence state, while the WP pin-when enabled via WPEN-blocks status register writes when pulled low. Block protection levels map directly to memory address ranges per Table 4, with BP1/BP0 bits defining protected segments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 32 Kbit (4096 words × 8 bits); sufficient for firmware parameter tables or calibration data in compact embedded systems. |
| Supply Voltage Range | 2.7 V to 5.5 V; enables direct interface with 3.3 V and 5 V logic domains without level shifting. |
| Max Clock Frequency | 3.0 MHz at VCC = 5.0 V; supports high-throughput configuration loading in real-time control loops. |
| Write Cycle Time | 10 ms typical; determines minimum latency between successive page writes in logging applications. |
| Endurance | 1 million write cycles; ensures >10 years of daily reconfiguration in field-deployed instrumentation. |
| Data Retention | 100 years at 25°C; guarantees long-term validity of stored calibration coefficients or security keys. |
| Operating Temperature | -40°C to +85°C; qualified for use in automotive body control modules and industrial PLC I/O cards. |
Pinout & Package
AT25320-10PC is supplied in an 8-pin PDIP (package code 8P3), 0.300" wide, with 0.100" lead pitch and through-hole mounting. Pin 1 is marked by a notch or dot; leads are tin-lead plated for solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be held low for entire SPI transaction including instruction, address, and data phases. |
| SCK | Serial Clock | Input-only synchronous timing reference; defines edge-triggered sampling of SI and SO signals per SPI Mode 0/3. |
| SI | Serial Data Input | Unidirectional input for op-codes, addresses, and write data; ignored during HOLD or when CS is high. |
| SO | Serial Data Output | Unidirectional output for read data and status register contents; tri-stated when CS is high or during HOLD. |
| GND | Ground Reference | Primary return path for VCC current and digital I/O; requires low-impedance connection to system ground plane. |
| VCC | Power Supply | Single supply input (2.7–5.5 V); bypass capacitor (0.1 µF ceramic) required within 10 mm of pin for noise immunity. |
| WP | Write Protect | Hardware lock for status register writes when WPEN = 1; tied low to prevent accidental configuration corruption during power-up. |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without resetting internal state; used to service higher-priority interrupts in real-time systems. |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 and 3 Support | Ensures interoperability with legacy 68HC11, PIC, and ARM Cortex-M0+ controllers without custom driver adaptation. |
| 32-byte Page Write | Reduces average programming time by 75% vs. byte-write mode, critical for rapid firmware update staging. |
| Four-Level Block Protection | Enables selective locking of configuration sectors (e.g., protect bootloader region while allowing user settings update). |
| Self-Timed Write Cycle | Eliminates need for external timing circuitry or polling overhead-RDSR bit 0 indicates completion. |
| Industrial Temperature Grade | Validated operation across -40°C to +85°C ambient, meeting AEC-Q100 stress requirements for under-hood automotive use. |
Applications
| Motor Control Firmware Storage | Smart Sensor Calibration Memory |
|---|---|
Use Scenario: Storing motor commutation tables and PID tuning parameters in BLDC driver boards operating in variable-temperature environments. IC Role / Device Role / Timing Role: Nonvolatile configuration store accessed during boot and runtime via SPI; retains values across power cycles. Use Value: Enables field-upgradable motor profiles without requiring external flash or battery-backed RAM, reducing BOM cost and board space. | Use Scenario: Holding factory-calibrated offset/gain coefficients and linearization lookup tables in industrial pressure transmitters. IC Role / Device Role / Timing Role: Read-once-at-boot EEPROM providing stable reference data for analog signal conditioning and ADC post-processing. Use Value: Achieves ±0.1% measurement accuracy over 10-year product life without recalibration, leveraging 100-year data retention. |
| PLC I/O Module Configuration | Medical Device Setup Parameters |
Use Scenario: Saving channel-specific scaling factors, alarm thresholds, and communication protocol settings in modular programmable logic controller racks. IC Role / Device Role / Timing Role: SPI-configurable memory mapped to controller's peripheral address space; updated only during commissioning or maintenance. Use Value: Supports hot-swap I/O modules with unique identity and configuration persistence, eliminating manual dip-switch setup. | Use Scenario: Securing patient-specific therapy parameters (e.g., infusion rates, dose limits) in portable insulin pumps and nebulizers. IC Role / Device Role / Timing Role: Tamper-resistant storage with hardware write protection (WP pin) preventing unauthorized parameter changes during clinical use. Use Value: Meets IEC 62304 software safety requirements by ensuring immutable treatment settings unless explicitly unlocked via secure service mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95320-WMN6TP | 32 Kbit SPI EEPROM, 1.8–5.5 V, 20 MHz max clock, 5 ms write cycle; uses different status register layout and lacks HOLD pin. | Higher speed but no suspend capability; suitable where fast bulk writes dominate and interrupt latency is not critical. | Select M95320-WMN6TP when system clock exceeds 3 MHz and HOLD functionality is unused. |
| 25AA320A-I/P | 32 Kbit SPI EEPROM, 1.8–5.5 V, 10 MHz max clock, 5 ms write cycle; includes extended address mode and enhanced ESD protection (4 kV HBM). | Supports >64 KB addressing via extended opcodes; preferred in designs migrating toward larger memory footprints. | Choose 25AA320A-I/P if future scalability to 64 Kbit+ devices is planned or ESD robustness in handheld medical enclosures is required. |
Compared with M95320-WMN6TP and 25AA320A-I/P, the AT25320-10PC offers deterministic HOLD behavior for real-time systems, proven industrial temperature reliability, and simpler status register interpretation-making it optimal for cost-sensitive, interrupt-driven control applications where timing predictability outweighs raw throughput.
Availability
AT25320-10PC is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics equipment, and automotive subsystems requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for AT25320-10PC 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 wireless solutions for embedded systems.
The AT25xxx family was designed specifically for SPI-based configuration and data logging in resource-constrained industrial and automotive electronics, emphasizing low-power operation, robust write protection, and drop-in compatibility across voltage grades.
FAQ
What is the maximum clock frequency supported by the AT25320-10PC at 3.3 V operation?
The AT25320-10PC supports up to 2.1 MHz at VCC = 2.7–5.5 V per AC Characteristics table. At 3.3 V, this translates to a guaranteed 2.1 MHz maximum SCK frequency, enabling efficient data transfer in mixed-voltage systems without clock throttling.
Does the AT25320-10PC require an external pull-up resistor on the SO pin?
No, the AT25320-10PC SO pin has an internal active pull-up and does not require an external resistor. It transitions to high-impedance when CS is high or during HOLD, and drives valid logic levels during active read cycles without external biasing.
How does the WP pin interact with the WPEN bit in the status register of the AT25320-10PC?
When WPEN = 1, the WP pin actively blocks status register writes if pulled low; when WPEN = 0, the WP pin is ignored. This allows AT25320-10PC to be deployed in systems with WP tied to ground while retaining full configurability via software control of WPEN.
Can the AT25320-10PC be used in SPI Mode 1 or Mode 2 configurations?
No-the AT25320-10PC explicitly supports only SPI Modes 0 (CPOL = 0, CPHA = 0) and 3 (CPOL = 1, CPHA = 1) as stated in its Features section. Attempting Mode 1 or 2 will result in misaligned sampling and corrupted data transfers.
What is the purpose of the HOLD pin on the AT25320-10PC, and how must it be controlled?
The HOLD pin pauses ongoing SPI communication without resetting the internal address counter or instruction state. To activate, bring HOLD low while SCK is low; to resume, return HOLD high while SCK remains low. This enables deterministic interrupt handling in time-critical firmware.
AT25320-10PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 32Kbit
- Memory Organization:
- 4K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 3 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AT25320-10PC FAQ
1.How can I place an order for AT25320-10PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25320-10PC 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 AT25320-10PC reliable?
The price and inventory of AT25320-10PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25320-10PC is usually 5 days.
3.What payment methods are accepted for AT25320-10PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25320-10PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25320-10PC?
AT25320-10PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25320-10PC 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 AT25320-10PC?
For technical support, including AT25320-10PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25320-10PC requirements.
6.How does Aetrix verify that AT25320-10PC is sourced from the original manufacturer or authorized distributors?
All AT25320-10PC 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 AT25320-10PC meets industry standards.
7.What is the process for return or replacement of AT25320-10PC?
All AT25320-10PC units undergo pre-shipment inspection (PSI). If there is an issue with AT25320-10PC, 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 AT25320-10PC part is unused and in its original packaging.
Return procedure for AT25320-10PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT25320-10PC Tags
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