Digital output circuit and digital output device

Abstract

This invention discloses a digital output circuit and a digital output device, relating to the field of communication technology. The digital output device includes a first external connection terminal and a second external connection terminal; the digital output circuit includes: a driving circuit; an optocoupler circuit, the input terminal of which is electrically connected to the output terminal of the driving circuit, for outputting a voltage signal according to a driving signal; a first NMOS transistor, the drain of which is electrically connected to the first external connection terminal, the gate of which is electrically connected to the first output terminal of the optocoupler circuit, and the source of which is electrically connected to the second output terminal of the optocoupler circuit; and a second NMOS transistor, the drain of which is electrically connected to the second external connection terminal, the gate of which is electrically connected to the first output terminal of the optocoupler circuit, and the source of which is electrically connected to the source of the first NMOS transistor; wherein, the first NMOS transistor and the second NMOS transistor are used to turn on or off the path between the first external connection terminal and the second external connection terminal according to the voltage signal. This invention aims to improve the applicability of digital output circuits.

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