Gregory's Serverfor contrast, this is the VTC of a standard 74HC04 (with buffering). the multiple stages of transistor inverters inside the chip sharpens up the transition region.
|
5 comments
 next up is the 74LS362. it is a clock generator. you connect a crystal or square wave source and it produces four non-overlapping phased clock outputs. there is a separate VDD rail that can handle 12V for level shifting the outputs. i think this part was used in the TI 99/4A. this is the 74LS624, which is a VCO (voltage controlled oscillator). i have no idea what it is doing in the 74xx series since it is totally analog!   |
74HCU04 devices can be used to build oscillators and even amplifiers! this snippet of the Snappy Video Snapshot circuit shows how they used a similar chip as an inverting op-amp to build an active low-pass filter!