AK536512W

The Accutek AK536512W high density memory module is a CMOS dynamic RAM organized in 512K x 36 bit words. The module consists of sixteen standard 256K x 4 DRAMs in plastic SOJ packages and eight 256K x 1 DRAMs in PLCC packages. The assembly has 12 drams mounted on each side of a printed circuit board in a 72 pad leadless SIM configuration.

This configuration allows socket-mounting of large quantities of emory in applications where high density and ease of inserting additional emory are important.

The operation of the AK536512 is identical to sixteen 256K x 4 plus ight 256K x 1 DRAMs. There are four CAS lines and four RAS ines. On each bank of 256K x 36, independent byte control is accomplished y four CAS lines. Each separate CAS line controls our 256K x 4 DRAMs and two 256K x 1 DRAMs with data in tied to ata out to form a 9 bit byte. Two banks of 36 bits are controlled by he two pairs of RAS lines. An eighteen bit data path can be produced y connecting DQ0 to DQ18, DQ1 to DQ19, etc. and alternately trobing RAS0 with RAS1 and RAS2 with RAS3.