Very very fast logic.We used to use ECL for very fast core processing, but it has always been expensive.
I think that's a _CMOS_ chip with SiGe ECL-style output stage (which is LVDS basically). The low input currentspecs make it clear it's not ECL throughout!The speed comes from using SiGe transistors in the output stage...
They use to be used a lot as input prescaler dividers ( a divide by 10 decade counter was popular) for frequency counters up to 1200 Mhz or so. They sucked up a lot of Vcc current and ran plenty hot, but they were the speed burners of their day. Motorola was a big supplier of ECL chips as I recall.Lefty
Quote from: retrolefty on Jan 27, 2013, 06:26 pmThey use to be used a lot as input prescaler dividers ( a divide by 10 decade counter was popular) for frequency counters up to 1200 Mhz or so. They sucked up a lot of Vcc current and ran plenty hot, but they were the speed burners of their day. Motorola was a big supplier of ECL chips as I recall.LeftyWas that made out of discrete chips like this or did they have something with a better level of integration?
Motorola's MECL family dates back to early 1970's. (Circa 1972)Parts like: MC10101 Quad Gate or MC1227FTypical Speeds 85-120MHZ / 4ns switching time... not bad for 1972.
The new machine was the first Cray design to use integrated circuits (ICs). Although ICs had been available since the 1960s, it was only in the early 1970s that they reached the performance necessary for high-speed applications. The Cray-1 used only four different IC types, an ECL dual 5-4 NOR gate (one 5-input, and one 4-input, each with differential output), another slower MECL 10K 5-4 NOR gate used for address fanout, a 16×4-bit high speed (6 ns) static RAM (SRAM) used for registers, and a 1,024×1-bit 50 ns SRAM used for the main memory. These integrated circuits were supplied by Fairchild Semiconductor and Motorola. In all, the Cray-1 contained about 200,000 gates.
What I still don't get is the crappy level of integration.
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