The HS-6564RH is a radiation hardened 64K bit, synchronous CMOS RAM module. It consists of 16 HS-6504RH 4K x 1 radiation hardened CMOS RAMs, in leadless carriers, mounted on a ceramic substrate. The individual RAMs are fabricated using the Intersil radiation hardened guard ring, self-aligned silicon gate technology. The HS-6564RH is configured as an extra wide, standard length 40 pin DIP. The memory appears to the system as an array of 16 4K x 1 static RAMs. The array is organized as two 8K by 4 blocks of RAM sharing only the address bus. The data inputs, data outputs, chip enables and write enables are seperate for each block of RAM. This allows the user to organize the HS-6564RH RAM as either an 8K by 8 or a 16K by 4 array.