The Brown-Meyer Lectures on Digital Systems
Module 1: Boolean Algebra & CMOS logic structures
© 2013
1.3 Properties of Open Drain NAND Gates
Introduction
Open Drain (OD) NAND gates are an unusual sort of logic gates. Unlike a traditional logic gate containing both N-channel and P-channel MOSFETs, the OD NAND gates only contain N-channel MOSFETs which means it is only connected to ground. Thus an external power source of 5 volts is connected to the output with a pull-up resistor connecting the two.
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