Microcmos Programmable 256k/1m/4m Dynamic Ram Controller/drivers

The DP8420A DP8421A DP8422A dynamic RAM controllers provide a low cost, single chip Interface between dynamic RAM and all 8-, 16- and 32-bit systems. The DP8420A DP8421A DP8422A gen- erate all the required access control signal Timing for DRAMs An on-chip refresh request Clock is used to auto- matically refresh the DRAM array. Refreshes and accesses are arbitrated on chip. If necessary, a WAIT or DTACK out- put inserts wait states into system access cycles, including burst mode accesses. RAS low time during refreshes and RAS precharge time after refreshes and back to back ac- cesses are guaranteed through the insertion of wait states. Separate on-chip precharge Counters for each RAS output CAN be used for memory interleaving to avoid delayed back to back accesses because of precharge. An additional fea- ture of the DP8422A is two access ports to simplify dual accessing. Arbitration among these ports and refresh is done on chip. By National Semiconductor Corporation
DP8420A 's PackagesDP8420A 's pdf datasheet
DP8421A
DP8422A




DP8420A Pinout, Pinouts
DP8420A pinout,Pin out
This is one package pinout of DP8420A,If you need more pinouts please download DP8420A's pdf datasheet.

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DP8420A Application Notes DP8420A RoHS DP8420A Circuits DP8420A footprint
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