TD100 delay line chip?

The question about the ttl oscillator jogged my memory. Anyone recognize a line of "delay line" chips with names like TD25, TD50, TD100, etc... The look they were expensive at the time, like $10 around 1976. The TD100 pinout looks like this: +------+ input | 1 14 | vcc | 2 13 | | 3 12 | 20ns 40ns | 4 11 | | 5 10 | 60s 80ns | 6 9 | gnd | 7 8 | 100ns +------+ I don't have an exact part number or mfg. (I know where I can find one but it's not easy and will take some work) I want to model these in verilog but I'm not exactly sure how they work. They are delay lines, but I'm not sure how they react. The input seems to be a short pulse from high to low of about 40ns. I'm assuming this produces an approx 40ns pulse after the prescibed delay, but I'm not entirely sure. I would love to see a few pages from a data book which describes how these react (enough to model them correctly). any pointers? -brad