IDT7164S20YIC SRAM 64KBIT 20NS 28SOJ|IDT|Lead All|RoHS Mixed IDT7164S20YG IDT7164S20YIIC SRAM 64KBIT 20NS 28SOJ|IDT|Lead All|RoHS Mixed IDT7164S20YGI IDT7164S20YI8IC SRAM 64KBIT 20NS 28SOJ|IDT|Lead All|RoHS Mixed IDT7164S20YGI8