SST39VF040-70-4I-WHE-T vs AS4C8M16SA-7TCNTR
| Part Number |
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| Category | General Memory | General Memory |
| Manufacturer | Microchip Technology | Alliance Memory, Inc. |
| Description | IC FLASH 4MBIT PARALLEL 32TSOP | IC DRAM 128MBIT PAR 54TSOP II |
| Package | Tape & Reel (TR) | Tape & Reel (TR) |
| Series | SST39 MPF™ | - |
| Voltage - Supply | 2.7V ~ 3.6V | 3V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C (TA) | 0°C ~ 70°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 32-TFSOP (0.488\", 12.40mm Width) | 54-TSOP (0.400\", 10.16mm Width) |
| Supplier Device Package | 32-TSOP | 54-TSOP II |
| Memory Size | 4Mb (512K x 8) | 128Mb (8M x 16) |
| Technology | FLASH | SDRAM |
| Memory Type | Non-Volatile | Volatile |
| Clock Frequency | - | 143 MHz |
| Access Time | 70 ns | 5.4 ns |
| Memory Format | FLASH | DRAM |
| Write Cycle Time - Word, Page | 20µs | 14ns |
| Memory Interface | Parallel | Parallel |
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1. What is the difference between RAM and ROM?
RAM is volatile storage and is used to temporarily store data; while ROM is non-volatile storage, which can still save data after the device is turned off, and is usually used to store unchangeable data such as system startup programs.
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2. What is SSD and how to distinguish it from HDD?
SSD (Solid State Drive) is a non-volatile storage device that stores data through flash memory. It has faster read and write speeds than HDD (Hard Disk Drive), no mechanical structure, and long life, but the price is relatively higher.
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3. What is ECC memory?
ECC (error correction code) memory detects and corrects single-bit errors in stored data, improving the reliability of memory and is commonly used in servers and data centers.
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4. How to extend the life of memory devices?
Measures such as regular data backup, avoiding excessive reading and writing of memory, ensuring proper temperature control, and preventing power fluctuations can help extend the life of memory.
