MEMORY CIRCUITS In Digital Logic Design.pptx

MEMORY CIRCUITS In Digital Logic Design.pptx

1. MEMORY CIRCUITS USING RAM IC 7489

2. What is memory?   Memory  is any physical device capable of storing information. Temporarily like, RAM (random access  memory ). Permanently, like ROM (read-only  memory ).  Memory  devices utilize integrated circuits and are used by operating systems, software, and hardware.

3. RAM IC 7489 The 7489 is a high speed 64 bit RAM organized as 16-word by 4-bit array. Data Inputs are used to insert 4-bit data. Address Inputs are used to select the specific address for data inputs. There are 4 pins for address inputs which means we can store data in 16 different addresses. Data Outputs are used to display stored data in Read Mode and data while storing Write Mode .

4. RAM IC 7489 Memory Enable (ME)  input must be in ‘0’ state to read information from the  memory. Write Enable (WE) must be ‘0’ while storing data and ‘1’ for reading data.