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I was curious about feature size (e.g. wire width). The number of transistors can actually be found in some datasheets (don't remember exactly which manufacture
by codedokode 2y ago
I was curious about feature size (e.g. wire width). The number of transistors can actually be found in some datasheets (don't remember exactly which manufacturer published it though).
- GeorgeTirebiter 2y agoA 2-input TTL NAND gate usually consists of 5 transistors: Two multi-emitter transistors (counted as two separate transistors here) One phase splitter transistor. One pull-down transistor. One output transistor. The multi-emitter transistors are easy to make on-chip and are a clever way of getting two inputs into one 'device'. For a 7400 that was 4 sections x 5 transistors per section = 20 transistors, total. NAND was the fundamental block in TTL; in the earlier RTL, NOR was the fundamental block - and used only 2 transistors, but needed resistors for the inputs and as the load pull-up. Power hungry and slow as a result.
- kragen 2y agoshouldn't you count the input clamping diodes as transistors