4 MBIT, LOW VOLTAGE, SERIAL FLASH MEMORY WITH 25 MHZ SPI BUS INTERFACE The M25P40 is a serial flash memory device manufactured by STMicroelectronics. Here are its key specifications, descriptions, and features:
### **Specifications:**
- **Memory Size:** 4 Mbit (512 KB)
- **Interface:** SPI (Serial Peripheral Interface)
- **Voltage Supply:** 2.7V to 3.6V
- **Operating Temperature Range:** -40°C to +85°C (Industrial)
- **Page Size:** 256 bytes
- **Sector Size:** 4 KB (64 sectors total)
- **Block Size:** 64 KB (8 blocks total)
- **Write Time (Page):** 1.4 ms (typical)
- **Erase Time (Sector):** 0.6 s (typical)
- **Erase Time (Block):** 2 s (typical)
- **Erase Time (Chip):** 30 s (typical)
- **Clock Frequency:** Up to 50 MHz
- **Data Retention:** 20 years
- **Endurance:** 100,000 write/erase cycles per sector
### **Descriptions:**
- The M25P40 is a non-volatile memory chip designed for embedded systems requiring reliable data storage.
- It supports SPI modes 0 and 3 for communication with microcontrollers.
- Features a deep power-down mode for reduced standby current consumption.
- Organized in uniform sectors and blocks for flexible erase operations.
### **Features:**
- **SPI Bus Compatibility:** Works with standard SPI interfaces.
- **Software & Hardware Write Protection:** Protects against accidental writes.
- **Deep Power-Down Mode:** Reduces power consumption to 1 µA (typical).
- **Fast Read Access:** Supports high-speed read operations.
- **Uniform Sector Architecture:** Simplifies memory management.
- **JEDEC Standard ID:** Ensures compatibility with industry standards.
This information is based on the manufacturer's datasheet and technical documentation.
