Custom 17MHz counter

► revisited some old stuff (BJT-RAM, . . .) that gave a new concept for a TTL counter that required a fast buffer for link up (which i designed) but it appeared to be not fully consistent in a new custom counter . . . so here what "we" came up (put through a fast/minimal testing) ::

the 67MHz inverting buffer

X1 - X6 're the new inverting buffers -- the Y-s 're 7404-s (? @ 37MHz)

the RAM induced concept counter . . . it'll use a lot of power . . .

. . . i guess the LS counters had a frequency lim. @ 6...7MHz the , the 7474 has 25MHz -- so this custom one doesn't quite extend a sh¡t here other than a 2-(now 4-) "inverter" counter design ? (. . . i !guess! the new buffer can be replaced by the 1/6-th of 7404 with minor modifications to this counter circuit - which is a pointless remark - but let's "us" to complete stat.-s as the 3x7400 and 2x7404 (5 IC-s) 'd make 6-bit counter = 3x7474 = 1.5x74193 (← ?? up 2 → 25...32MHz) ? from where i remember "my" 6...7MHz , hm ??? . . . . . . . . . i thought i put a link here for 74193's 30,25,20, or at least 16 MHz scope diagram ► the only thing the Google found was some ancient nasa tech. paper where they used it with 4...5MHz CLK input that is way lower of proposed 25...32MHz . . . whatever)

[Eop]