I'm building a breadboard 8-bit computer (Ben Eater design: https://eater.net/). However, I decided to substitute two 74ls173 (D flip-flops) with one 74hct377. The register works as expected, but the 74ls245 doesn't output the data to the bus. What did I check:
- The connections seem ok. The Buffer is working in A->B direction (pin 1 high). The output is enabled (pin 19 is low). Both ground and VC are connected.
- The buffer receives data on pins A. The voltage is approx. 2,5V.
- The supply voltage is a bit too low: 3,5-4V. My power supply is supposed to give 5V, but I got Voltage drops (I have difficulties handling them). Anyway, other IC seem to work well enough on 3,5-4V, even the 74ls245 at the other location in the circuit.