CYM1838

The CYM1838 is a very high performance 4-megabit static RAM module organized as 128K words by 32 bits. The CYM1838  is constructed using four 128K x 8 static RAMs mounted onto a multilayer ceramic substrate. Four chip selects (CS₁, CS₂, CS₃, CS₄) are used to independently enable the four bytes. Reading or writing of the CYM1838  can be executed on individual bytes or any combination of multiple bytes through proper use of selects.

Writing to each byte is accomplished when the appropriate chip selects (CS) and write enable (WE) inputs of the CYM1838 are both LOW.Data on the input/output pins (I/OX) is written into the memory location specified on the address pins (A0 through A16).

Reading the CYM1838 is accomplished by taking chip selects LOW while write enable remains HIGH. Under these conditions, the contents of the memory location specified on the address pins will appear on the data input/output pins. The data input/output pins of the CYM1838  remain in a high-impedance state when write enable is LOW or the appropriate chip selects are HIGH.