M95256-DRMF3TG/K - 256Kbit SPI EEPROM | STMicroelectronics
MPN: M95256-DRMF3TG/K ✓ نشطM95256-DRMF3TG/K نظرة عامة
A serial EEPROM is a non-volatile memory that retains data when power is removed, using a serial interface (SPI, I2C, or Microwire) to communicate with a host microcontroller. In the memory hierarchy, it sits between volatile RAM and mass storage, providing byte-level programmability and endurance of up to 4 million write cycles. The SPI interface offers a balance of speed and simplicity, making it ideal for applications requiring frequent updates of configuration parameters, calibration data, or small logs.
Key features of the M95256-DRMF3TG/K include a wide voltage range (1.8V to 5.5V), a 20 MHz SPI clock, write protection via a hardware pin (WC), and a status register with WIP (Write In Progress) and WEL (Write Enable Latch) bits. It also supports page write mode (up to 64 bytes per page) and a self-timed write cycle of 5 ms typical. The device is RoHS compliant and halogen-free, meeting modern environmental standards.
Technically, the M95256-DRMF3TG/K uses a floating-gate CMOS process, providing endurance of 4 million write cycles and data retention of 100 years. The SPI interface supports modes 0 and 3, and the device includes a write-protect pin (WC) that, when held high, prevents write operations to the entire memory array. The MLP package offers a small footprint (2x3 mm) with a thermal resistance of approximately 100 C/W, suitable for space-constrained designs.
Typical applications include industrial automation (parameter storage), automotive electronics (calibration data), smart meters (data logging), and IoT devices (device configuration). The wide voltage range and low power consumption (1 uA standby current) make it suitable for battery-powered equipment.
When designing with this device, ensure the SPI lines are properly terminated and the WC pin is tied to a known logic level (e.g., via a pull-up resistor) to avoid unintended writes. Also, consider the write cycle time (5 ms) when planning system timing, and use the WIP bit to poll for write completion.
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M95256-DRMF3TG
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M95256-DRMF3TG/K
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عرض ورقة البيانات ←M95256-DRMF3TG/K
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عرض ورقة البيانات ←M95256-DRMF3TG/K المواصفات
| حجم الذاكرة | 256 Kbit (32 Kbyte) |
| نوع الواجهة | SPI |
| Clock Frequency | 20 MHz (max) |
| جهد التغذية | 1.8 V to 5.5 V |
| التنظيم | 32,768 x 8 bits |
| Page Size | 64 bytes |
| Write Cycle Time | 5 ms (typical) |
| Endurance | 4 million write cycles |
| Data Retention | 100 years |
| Standby Current | 1 uA (typical) |
| درجة حرارة التشغيل | -40C to +85C |
| العلبة | MLP (DFN) 8-pin, 2x3 mm |
| نوع التركيب | Surface Mount |
| حالة RoHS | Compliant |
| خالٍ من الهالوجين | Yes |
تكوين أطراف M95256-DRMF3TG/K
| دبوس 1 | C — Serial Clock |
| دبوس 2 | D — Serial Data Input |
| دبوس 3 | Q — Serial Data Output |
| دبوس 4 | S — Chip Select (active low) |
| دبوس 5 | WC — Write Control (active high) |
| دبوس 6 | VSS — Ground |
| دبوس 7 | VCC — Power Supply |
| دبوس 8 | NC — Not Connected |
التطبيقات النموذجية
M95256-DRMF3TG/K مناسب لـ 6 التطبيقs: Industrial Automation, Automotive Electronics, Smart Meters, IoT Devices, Medical Devices, Consumer Electronics.
Industrial Automation
The M95256-DRMF3TG/K is used in industrial automation for storing configuration parameters, calibration data, and operational logs. Its wide voltage range (1.8V-5.5V) and high endurance (4 million cycles) ensure reliable operation in harsh environments. The SPI interface allows fast data transfer, and the small MLP package fits compact PLC modules. In a typical PLC, the EEPROM stores user programs and settings, with the microcontroller reading/writing via SPI. The write protection pin (WC) prevents accidental data corruption during firmware updates. Compared to other memory types, the EEPROM provides non-volatile storage with byte-level flexibility, essential for frequent parameter updates.
موصى به
Automotive Electronics
In automotive electronics, the M95256-DRMF3TG/K stores calibration data for engine control units (ECUs), airbag systems, and infotainment. Its operating temperature range (-40C to +85C) meets automotive requirements, and the 100-year data retention ensures long-term reliability. The device is used to store VIN numbers, odometer readings, and diagnostic trouble codes. The SPI interface enables fast read/write operations, and the low standby current (1 uA) is crucial for battery preservation. The write protection pin prevents unauthorized modifications, enhancing security. Compared to EEPROMs with lower endurance, this device supports frequent updates without wear-out.
موصى به
Smart Meters
The M95256-DRMF3TG/K is ideal for smart meters, storing consumption data, tariff information, and calibration constants. Its low power consumption (1 uA standby) extends battery life, and the high endurance (4 million cycles) supports frequent data logging. The SPI interface allows efficient communication with the metering IC. In a typical smart meter, the EEPROM stores monthly consumption records, with the microcontroller writing data at regular intervals. The write protection pin prevents tampering, ensuring data integrity. The wide voltage range accommodates battery voltage variations. Compared to flash memory, EEPROM offers byte-level write capability, essential for frequent small updates.
موصى به
IoT Devices
In IoT devices, the M95256-DRMF3TG/K stores device configuration, network credentials, and sensor calibration data. Its small package (2x3 mm) is ideal for space-constrained designs, and the low power consumption is critical for battery-powered sensors. The SPI interface provides fast data transfer, and the wide voltage range supports various battery chemistries. In a typical IoT node, the EEPROM stores the device ID and Wi-Fi credentials, with the microcontroller reading them at boot. The write protection pin prevents accidental overwrites. The high endurance ensures reliable operation over the device's lifetime. Compared to external flash, EEPROM offers simpler integration and lower cost for small data sizes.
موصى به
Medical Devices
The M95256-DRMF3TG/K is used in medical devices for storing patient data, device settings, and calibration information. Its high reliability (100-year retention) and wide temperature range make it suitable for medical environments. The SPI interface allows secure data transfer, and the write protection pin ensures data integrity. In a typical glucose meter, the EEPROM stores calibration codes and test results. The low power consumption extends battery life, and the small package fits portable devices. Compared to other memory types, EEPROM provides non-volatile storage with high endurance, essential for frequent updates.
موصى به
Consumer Electronics
In consumer electronics, the M95256-DRMF3TG/K stores user preferences, device settings, and firmware configuration. Its small package and low cost make it ideal for mass-produced devices. The SPI interface provides fast data access, and the wide voltage range supports various power supplies. In a typical smart TV, the EEPROM stores channel lists and display settings. The write protection pin prevents accidental changes. The high endurance ensures reliable operation over years of use. Compared to flash memory, EEPROM offers simpler write operations and lower power consumption for small data.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ M95256-DRMF3TG/K — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | M95256-DRMF3TG | 25LC256-I/SN | CAT25M02 |
|---|---|---|---|---|
| Package | MLP (DFN) 8-pin | MLP (DFN) 8-pin | SOIC-8 | SOIC-8 |
| Brand | STMicroelectronics | STMicroelectronics | Microchip Technology | onsemi |
| Memory Size | 256 Kbit | 256 Kbit | 256 Kbit | 2 Mbit |
| Interface | SPI | SPI | SPI | SPI |
| Max Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage | 1.8V - 5.5V | 1.8V - 5.5V | 2.5V - 5.5V | 1.8V - 5.5V |
| Endurance | 4 million cycles | 4 million cycles | 1 million cycles | 1 million cycles |
| Data Retention | 100 years | 100 years | 200 years | 100 years |
أبرز الفروقات
- Higher endurance (4 million cycles) compared to Microchip 25LC256 (1 million cycles) (مقابل25LC256-I/SN)
- Wider supply voltage range (1.8V-5.5V) compared to Microchip 25LC256 (2.5V-5.5V) (مقابل25LC256-I/SN)
- Smaller package (MLP 2x3 mm) compared to SOIC-8 alternatives (مقابل25LC256-I/SN)
ملاحظات التصميم
Place decoupling capacitor (0.1 uF) close to VCC pin. Ensure SPI traces are short and have matched impedance to avoid signal integrity issues at 20 MHz. Use ground plane under the device.
Ensure the WC pin is tied to a known logic level (e.g., via pull-up resistor) to prevent accidental writes. Also, poll the WIP bit after each write to ensure completion before starting a new operation.
The MLP package has a thermal resistance of approximately 100 C/W. For typical operation, power dissipation is low (less than 0.1W), so thermal issues are unlikely. However, in high-temperature environments, ensure the junction temperature stays within limits.
معلومات الامتثال
RoHS compliant and halogen-free per ST datasheet. Not AEC-Q100 qualified for this variant.
