AT28C256E-15TU-T vs AT28HC256-12SU-T
| Part Number |
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| Category | General Memory | General Memory |
| Manufacturer | Microchip Technology | Microchip Technology |
| Description | IC EEPROM 256KBIT PAR 28TSOP | IC EEPROM 256KBIT PAR 28SOIC |
| Package | -Reel® | Tape & Reel (TR) |
| Series | - | - |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TC) | -40°C ~ 85°C (TC) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 28-TSSOP (0.465\", 11.80mm Width) | 28-SOIC (0.295\", 7.50mm Width) |
| Supplier Device Package | 28-TSOP | 28-SOIC |
| Memory Size | 256Kb (32K x 8) | 256Kb (32K x 8) |
| Technology | EEPROM | EEPROM |
| Memory Type | Non-Volatile | Non-Volatile |
| Clock Frequency | - | - |
| Access Time | 150 ns | 120 ns |
| Memory Format | EEPROM | EEPROM |
| Write Cycle Time - Word, Page | 10ms | 10ms |
| Memory Interface | Parallel | Parallel |
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1. What are the main types of memory?
Common memory types include random access memory (RAM), read-only memory (ROM), flash memory, hard disk drive (HDD), and solid-state drive (SSD).
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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 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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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.
