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DP8421A

National Semiconductor
Part Number DP8421A
Manufacturer National Semiconductor
Description (DP8420A - DP8422A) microCMOS Programmable 256k/1M/4M Dynamic RAM Controller/Drivers
Published Jan 7, 2006
Detailed Description DP8420A 21A 22A microCMOS Programmable 256k 1M 4M Dynamic RAM Controller Drivers July 1992 DP8420A 21A 22A microCMOS P...
Datasheet PDF File DP8421A PDF File

DP8421A
DP8421A

Overview
DP8420A 21A 22A microCMOS Programmable 256k 1M 4M Dynamic RAM Controller Drivers July 1992 DP8420A 21A 22A microCMOS Programmable 256k 1M 4M Dynamic RAM Controller Drivers General Description The DP8420A 21A 22A dynamic RAM controllers provide a low cost single chip interface between dynamic RAM and all 8- 16- and 32-bit systems The DP8420A 21A 22A generate all the required access control signal timing for DRAMs An on-chip refresh request clock is used to automatically refresh the DRAM array Refreshes and accesses are arbitrated on chip If necessary a WAIT or DTACK output inserts wait states into system access cycles including burst mode accesses RAS low time during refreshes and RAS prech...


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