K7Q163664B sram equivalent, (k7q161864b / k7q163664b) 512kx36 & 1mx18 qdr tm b4 sram.
* 1.8V/2.5V +0.1V/-0.1V Power Supply.
* I/O Supply Voltage 1.5V +0.1V/-0.1V for 1.5V I/O, 1.8V+0.1V/-0.1V for 1.8V I/O.
* Separate independent read and write .
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