PCF8570T/F5,512 vs AS62V256A-70SINTR
| Part Number |
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| Category | General Memory | General Memory |
| Manufacturer | NXP USA Inc. | Alliance Memory, Inc. |
| Description | IC SRAM 2KBIT I2C 100KHZ 8SO | IC SRAM 256KBIT PARALLEL 28SOP |
| Package | Tube | Tray |
| Series | - | - |
| Voltage - Supply | 2.5V ~ 6V | 2.5V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 8-SOIC (0.295\", 7.50mm Width) | 28-SOIC (0.330\", 8.38mm Width) |
| Supplier Device Package | 8-SO | 28-SOP |
| Memory Size | 2Kb (256 x 8) | 256Kb (32K x 8) |
| Technology | SRAM | SRAM - Asynchronous |
| Memory Type | Volatile | Volatile |
| Clock Frequency | 100 kHz | - |
| Access Time | - | 70 ns |
| Memory Format | SRAM | SRAM |
| Write Cycle Time - Word, Page | - | 70ns |
| Memory Interface | I²C | Parallel |
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1. What is flash memory and what are the common types of flash memory?
Flash memory is a non-volatile memory used to store data, and the data will not be lost even if the device is powered off. Common types are NAND and NOR flash memory, which are mainly used in USB flash drives, SSDs, memory cards, etc.
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2. What is the difference between cache and RAM?
Cache is a high-speed memory between the CPU and the main memory, which is used to temporarily store data and instructions commonly used by the CPU to speed up the system. RAM is the main storage of the system, which is used to store data for applications and operating systems.
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3. What is embedded memory?
Embedded memory is a memory integrated into an electronic system for real-time data processing and program execution of the device. It is commonly found in microcontrollers, mobile devices, and embedded systems.
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4. 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.
