How do the number of transistors and the number of gates indicating the density differ?
A3 The number of transistors indicates the total number of internal bipolar transistors and MOS transistors (FETs). In contrast, the number of gates indicates the number of MOS gate structures (this does not mean the number of gate pins of each FET). Basically, a gate for a CMOS device consists of two MOS transistors (NMOS and PMOS). Therefore, the number of gates is half the number of transistors. However, one transistor (NMOS only) creates a gate structure for an open-drain output device. This is counted as a difference in the number of gates from those of the CMOS device. The “number of usable gates” of a gated array means the number of CMOS structures that can be used as a logic gate of a circuit which users can design.
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