[time-nuts] Need info on HP 1 MHz ovenized XO

Charles P. Steinmetz charles_steinmetz at lavabit.com
Mon Jan 14 00:00:46 UTC 2013


Ed wrote:

>On opening it up I found that the circuitry includes a 74LS73 dual 
>JK FF, and a 74LS140 - very obscure - apparently a dual 4-input gate 
>of some sort.

AFAIK, the '140 was only supplied in the "S" series (74S140).  It's a 
dual 4-input NAND 50 ohm line driver.

Best regards,

Charles









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