IS34ML01G081-BLI vs AT28C256F-15SU-T

Part Number	IS34ML01G081-BLI	AT28C256F-15SU-T
Category	General Memory	General Memory
Manufacturer	ISSI, Integrated Silicon Solution Inc	Microchip Technology
Description	IC FLASH 1GBIT PARALLEL 63VFBGA	IC EEPROM 256KBIT PAR 28SOIC
Package	Tray	Tape & Reel (TR)
Series	-	-
Voltage - Supply	2.7V ~ 3.6V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TC)
Mounting Type	Surface Mount	Surface Mount
Package / Case	63-VFBGA	28-SOIC (0.295\", 7.50mm Width)
Supplier Device Package	63-VFBGA (9x11)	28-SOIC
Memory Size	1Gb (128M x 8)	256Kb (32K x 8)
Technology	FLASH - NAND (SLC)	EEPROM
Memory Type	Non-Volatile	Non-Volatile
Clock Frequency	-	-
Access Time	25 ns	150 ns
Memory Format	FLASH	EEPROM
Write Cycle Time - Word, Page	25ns	3ms
Memory Interface	Parallel	Parallel

1. 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.
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.
3. Why is the DRAM refresh rate important?

DRAM needs to be refreshed regularly to maintain data. The refresh rate affects the power consumption and speed of the memory. The higher the refresh rate, the faster the memory responds, but it also increases power consumption.
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.