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Transistor Transistor Logic. Logic circuits built from bipolar transistors and resistors.

5
votes
coupled logic (faster, used in the IBM 7030 Stretch Computer) TTL - transistor-transistor logic (the most popular logic family prior to CMOS) 74xx (1964) - original TTL line (also 54xx for … CMOS, used same pinouts as 74LS family CMOS HCT (1982) - CMOS logic but as TTL logic levels (made combining them possible) CMOS has the advantage over bipolar in that it uses no power except …
answered Oct 22 '14 by tcrosley
3
votes
Because the minimum output level for a logic 1 using 3.3V level logic is 2.4v; and the minimum logic 1 level for 5v logic is 2.0v. As far as your UARTs are concerned, I would test out each one indiv …
answered Apr 15 '15 by tcrosley
3
votes
As others have mentioned the circuit you linked to is a 3-input NAND gate (7410), not an AND. This is a pretty standard circuit for a TTL logic gate, except that instead of the diode between the two …
answered Aug 30 '15 by tcrosley
5
votes
There were quite a few 3-input gates made, with three circuits per package. This meant that 12 pins would be needed (3 inputs, 1 output) x 3 and adding VCC and GND uses up all 14 pins in a 14-pin pac …
answered Aug 21 '14 by tcrosley
1
vote
I assume since your circuit says it is using 7404, and not for example 74LS04 etc then it is really classic 7404 TTL. So you are right, according to the datasheet the range for a low input is 0v to …
answered Jun 7 '15 by tcrosley
3
votes
The 2N6782 N-channel FET is rated at 100v drain to source at a maximum 3.5A and 15W max power. I picked a through-hole part because the surface-mount part would be difficult to solder by hand. To dr …
answered Jan 27 '14 by tcrosley