IDT6116SA20TPIC SRAM 16KBIT 20NS 24DIP|IDT|Lead All|RoHS Mixed IDT6116SA20TPG IDT6116SA20TPIIC SRAM 16KBIT 20NS 24DIP|IDT|Lead All|RoHS Mixed IDT6116SA20TPGI IDT71256SA20TPIIC SRAM 256KBIT 20NS 28DIP|IDT|Lead All|RoHS Mixed IDT71256SA20TPGI