MEMORY DATABOOK - Al Kossow's Bitsavers

-----------------------.APPLICATIONS.4. PERIPHERAL CONTROL CIRCUITThe three types of dynamic RAM control ICs shown inthe following teble are available at present.IntelMotorolaManufacturerTexas Instruments(T. IlAdvanced MicroDevice (AMD)Inteli·3242ModelMC-324274 LS601603Am2964Ai-8203Functionso Seven·bit address multiplexer (for 16K bitdynamic RAM)o Seven·bit refresh address count functiono Direct dirving capability of memory elements (forapprox. 20 elements. 250 pF/25 ns 15 pF/9 ns)o Application to a 64K bit dynamic RAM, example(see the following figure)o Refresh timer using an RC multivibratoro Timing generationo Refresh address (7-bit address)o Address latch/multiplex function (16-bit address)o Refresh address countero RAS decoder (2 - 4)o 8-bit address multiplexer (for 16K/64K DRAM)o Direct dring capability of memory elemento Including timing controlREFENABLEAo------.--1--L-----~----------------r_~3242A,.------~---L __ ~-----1---------------------L--lMSM3764A,A,. ______ ---.JA .. --------iROW ENABLEHI447