CYM1465

The CYM1465 is a high-performance 4-megabit static RAM module organized as 512K words by 8 bits. The  CYM1465  is constructed using four 128K x 8 RAMs mounted on a substrate with pins. A decoder is used to interpret the higher-order addresses (A₁₇ and A₁₈) and to select one of the four RAMs.

Writing to the  CYM1465  is accomplished when the chip select (CS) and write enable (WE) inputs are both LOW. Data on the eight input/output pins (I/O₀ through I/O₇) of the  CYM1465  is written into the memory location specified on the address pins (A₀ through A₁₈). Reading the device is accomplished by taking chip select and output enable (OE) LOW while write enable remains inactive or HIGH. Under these conditions, the contents of the memory location specified on the address pins (A₀ through A₁₈) will appear on the eight appropriate data input/ output pins (I/O0 through I/O₇).

The input/output pins of the  CYM1465  remain in a high-impedance state unless the module is selected, outputs are enabled, and write enable is HIGH.