Questions tagged [ttl]
Transistor Transistor Logic. Logic circuits built from bipolar transistors and resistors.
587 questions
6 votes
3 answers
919 views
Is 74LS00 max current a capability or a limit?
a newbie question here. Many datasheets specify the max input/output current for the integrated circuits. I'd like to know if that is the maximum they can provide or the maximum above which they break....
- 163
0 votes
4 answers
108 views
Why would you put a pullup resistor on the output of a TTL compatible IC?
I am building a square wave generator with a ne555. The datasheet in section 6.3.2 Astable Operations has an example circuit that is essentially the same as my practice circuit but with a 1k pullup ...
- 21
3 votes
1 answer
197 views
7400 vs 4000 series pinout difference for quad two-input gates; explanation?
All of the quad two-input logic gates (AND, OR, NAND, NOR, XOR) have consistent pinouts within the 74xx family [Edit, turns out not true], and a different consistent pinout within the 40xx family [...
- 2,861
1 vote
1 answer
143 views
Problems with SIM808
I have a SIM808 Shield from DFrobot which works fine, I can use it with my Arduino Uno or with my USB-Uart Modul and communicate with it without any problems. However, when using another SIM808 from &...
- 21
2 votes
1 answer
118 views
24-bit parallel image signal length matching requirements
We are using output of deserializer MAX9280 for display. The resolution is 800x480 with frame rate of 60hz. PCLK is around 25Mhz. We thought length matching is not important in this application, so ...
- 41
-1 votes
1 answer
107 views
Converting RS485 to TTL and then to LIN
Is it possible to convert an RS485 signal to TTL and then to LIN without using microcontroller?
- 9
2 votes
3 answers
385 views
Driving a 74LS gate with a 4000-series output
I'm making a PCB based on a schematic I found online. On the schematic, a diode AND gate takes in signals from a 74LS298 multiplexer and a 4520 binary counter and outputs to a 74LS86. Since I've added ...
- 41
0 votes
2 answers
93 views
DIP or DIP like auto-bidirectional multi-voltage level translator [closed]
I am looking for an auto-bidirectional multi-voltage level translator for converting TTL and LVCMOS level signals. I understand that the 3.3 signal coming from the LVCMOS system is safe for the TTL ...
