Historically, how did the density of bipolar (e.g. TTL) chips compare with MOS? How complex could bipolar ICs get before they hit limits? Does anyone have a Moore's law-style graph for bipolar technology?
Edit: A specific number I'd like to know is the most transistors or gates implemented on a bipolar IC.
Background, and what I've found so far:
I'm looking at the TTL 74181 ALU chip (1970, 75 logic gates), which was a fairly advanced bipolar chip for its time. At the time, MOS was somewhat ahead in density with thousands of transistors on a chip. But now MOS ICs can have billions of transistors but bipolar is nowhere near that. That got me wondering at what point did TTL (or other bipolar technologies) stop scaling?
I came across Integrated Injection Logic (I2L), a bipolar technology that was supposed to provide MOS-like density. The TI SPB9900 microprocessor (1976) used I2L and had 6034 gates, which surprisingly is more than MOS microprocessors from 1976. I haven't heard much about I2L, so did it die out?
In 1986 there was the MBM10494 64K bipolar ECL RAM, versus 256K MOS DRAM, so bipolar was still fairly close. I haven't been able to find larger bipolar RAMs, so I suspect that's about the limit. Was the limiting factor power consumption, manufacturing, economics, or something else?