nand - More Fun with the CD4093 IC as Schmitt Trigger Oscillator. Any practical difference between circuit version with "Enable" pin and Without? - Electrical Engineering Stack Exchange
CD4093 - Quad 2-Input NAND Schmitt Trigger IC
How to Understand and Use IC 4093 NAND Gates, PinOuts | Homemade Circuit Projects
CD4093 - Quad 2-Input NAND Schmitt Trigger IC
CD4093 datasheet -
CD4093B: CD4093 specification - Logic forum - Logic - TI E2E support forums