Memory is a physical device for storing information, categorized as temporary (RAM) or permanent (ROM). The RAM IC 7489 is a high-speed 64-bit memory organized as a 16-word by 4-bit array, with specific inputs for data and address selection. Operation involves enabling inputs for reading and writing data based on the state of the memory enable and write enable signals.

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.