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Old 12th Oct 2021, 10:56 am   #8
Radio1950
Hexode
 
Join Date: Apr 2017
Location: Buderim, Queensland, Australia.
Posts: 428
Default Re: Interesting Vintage TTL Logic IC Problem

Quote:
Originally Posted by PJL View Post
The sink current for CKB is -3.2mA and low voltage is 0.4V. You really need a transistor buffer with pull-up resistor to drive this.
I did try a PN100 emitter follower with no improvement.
It had 1000R emitter resistor, no collector resistor, 5V supply, DC coupled to clock input.
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