IS25LQ040B-JBLE vs FT24C128A-UMR-B
| Part Number |
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| Category | General Memory | General Memory |
| Manufacturer | ISSI, Integrated Silicon Solution Inc | Fremont Micro Devices Ltd |
| Description | IC FLASH 4MBIT SPI/QUAD 8SOIC | IC EEPROM 128KBIT I2C 1MHZ 8MSOP |
| Package | -Reel® | Tube |
| Series | - | - |
| Voltage - Supply | 2.3V ~ 3.6V | 1.8V ~ 5.5V |
| Operating Temperature | -40°C ~ 105°C (TA) | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 8-SOIC (0.209\", 5.30mm Width) | 8-TSSOP, 8-MSOP (0.118\", 3.00mm Width) |
| Supplier Device Package | 8-SOIC | 8-MSOP |
| Memory Size | 4Mb (512K x 8) | 128Kb (16K x 8) |
| Technology | FLASH - NOR | EEPROM |
| Memory Type | Non-Volatile | Non-Volatile |
| Clock Frequency | 104 MHz | 1 MHz |
| Access Time | - | 550 ns |
| Memory Format | FLASH | EEPROM |
| Write Cycle Time - Word, Page | 800µs | 5ms |
| Memory Interface | SPI - Quad I/O | I²C |
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1. What are volatile and non-volatile memory?
Volatile memory loses data when power is off, such as RAM; non-volatile memory retains data after power is off, such as ROM and flash memory.
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2. What is the memory hierarchy in a computer?
The computer memory hierarchy includes registers, cache, main memory (RAM), secondary storage (such as HDD or SSD), and external storage (such as tape, optical disk) from speed to capacity, and each level has different storage and access speeds.
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3. What is virtual memory and how does it work?
Virtual memory is a technology that uses hard disk space as memory, allowing the system to use hard disk space to expand memory when physical RAM is insufficient, improving the system's multitasking capabilities.
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4. What is High Bandwidth Memory (HBM) and what are its advantages?
HBM is a high-bandwidth, low-latency memory technology commonly used in graphics cards and AI accelerators that can handle a large number of parallel computing tasks. HBM's stacked architecture makes it take up less space and more efficient, making it an ideal choice for big data and high-performance computing applications.
