HP Forums / HP Calculators (and very old HP Computers) / General Forum v / smaller HP 82166A with 32-pin connector

Post Reply 
smaller HP 82166A with 32-pin connector
09-09-2021, 04:56 AM
Post: #27
Dave Frederickson Offline
Senior Member
 		Posts: 2,187
Joined: Dec 2013
RE: smaller HP 82166A with 32-pin connector
(09-08-2021 04:51 PM)Klaus Overhage Wrote:  While looking for a 74LS74, I came across a 7474 with no letters in between. Didn't know that these TTL-ICs are also available without letters, is probably an early version, but behaves exactly like a 74LS74.

No, a standard TTL 7474 does not behave exactly like a Low-Power Schottky device. The std TTL part outputs can sink 16mA while the LS device outputs can only sink 8mA. See the datasheet.
https://www.ti.com/lit/ds/symlink/sn54ls74a-sp.pdf

Dave
Find all posts by this user
Quote this message in a reply
Post Reply 


Messages In This Thread
RE: smaller HP 82166A with 32-pin connector - Dave Frederickson - 09-09-2021 04:56 AM



User(s) browsing this thread: 2 Guest(s)

Contact Us | The Museum of HP Calculators | Return to Top | Return to Content | Lite (Archive) Mode | RSS Syndication