DatasheetsPDF.com

DP8422A Datasheet

Part Number DP8422A
Manufacturers National Semiconductor
Logo National Semiconductor
Description (DP8420A - DP8422A) microCMOS Programmable 256k/1M/4M Dynamic RAM Controller/Drivers
Datasheet DP8422A DatasheetDP8422A Datasheet (PDF)

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 R.

  DP8422A   DP8422A






Part Number DP8422V
Manufacturers National Semiconductor
Logo National Semiconductor
Description microCMOS Programmable 256k/1M/4M Dynamic RAM Controller/Drivers
Datasheet DP8422A DatasheetDP8422V Datasheet (PDF)

DP8420V 21V 22V-33 DP84T22-25 microCMOS Programmable 256k 1M 4M Dynamic RAM Controller Drivers May 1992 DP8420V 21V 22V-33 DP84T22-25 microCMOS Programmable 256k 1M 4M Dynamic RAM Controller Drivers General Description The DP8420V 21V 22V-33 DP84T22-25 dynamic RAM controllers provide a low cost single chip interface between dynamic RAM and all 8- 16- and 32-bit systems The DP8420V 21V 22V-33 DP84T22-25 generate all the required access control signal timing for DRAMs An on-chip refresh request .

  DP8422A   DP8422A







(DP8420A - DP8422A) microCMOS Programmable 256k/1M/4M Dynamic RAM Controller/Drivers

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 precharge time after refreshes and back to back accesses 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 feature of the DP8422A is two access ports to simplify dual accessing Arbitration among these ports and refresh is done on chip of Pins (PLCC) 68 68 84 of Address Outputs 9 10 11 Features Y Y Y Y Y Y Y Y Y On chip high precision delay line to guarantee critical DRAM access timing parameters microCMOS process for low power High capacitance drivers for RAS CAS WE and DRAM address on chip On chip support for nibble page and static column DRAMs Byte enable signals on chip allow byte writing in a word size up to 32 bits wi.


2006-01-07 : D8741A    DP8406    DP8459    DP8440    DP8432V    DP8431V    DP8430V    DP8429    DP8428    DP84244   


@ 2014 :: Datasheetspdf.com ::
Semiconductors datasheet search & download site (Privacy Policy & Contact)