AT28C256E-15TU-T vs IS34ML01G081-BLI
| Part Number |
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| Category | General Memory | General Memory |
| Manufacturer | Microchip Technology | ISSI, Integrated Silicon Solution Inc |
| Description | IC EEPROM 256KBIT PAR 28TSOP | IC FLASH 1GBIT PARALLEL 63VFBGA |
| Package | -Reel® | Tray |
| Series | - | - |
| Voltage - Supply | 4.5V ~ 5.5V | 2.7V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C (TC) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 28-TSSOP (0.465\", 11.80mm Width) | 63-VFBGA |
| Supplier Device Package | 28-TSOP | 63-VFBGA (9x11) |
| Memory Size | 256Kb (32K x 8) | 1Gb (128M x 8) |
| Technology | EEPROM | FLASH - NAND (SLC) |
| Memory Type | Non-Volatile | Non-Volatile |
| Clock Frequency | - | - |
| Access Time | 150 ns | 25 ns |
| Memory Format | EEPROM | FLASH |
| Write Cycle Time - Word, Page | 10ms | 25ns |
| Memory Interface | Parallel | Parallel |
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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 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 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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4. How to upgrade the computer's memory?
Computer storage performance can usually be improved by adding RAM modules or upgrading the HDD to a faster SSD. It is also necessary to ensure that the new hardware is compatible with the system, especially motherboard support and memory type.
