Output buffer circuit

The output buffer circuit is capable of taking three output states, high level, low level and high impedance. … The buffer circuit includes a detector circuit (Zener diode D3, resistors R5 and R6, and transistor Q5) for detecting power source voltage (Vcc) applied to the buffer circuit. When the pow...

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Bibliographic Details
Main Authors KOYAMA, KAZUMI, KAWABATA, YUICHI, FUKUSHIMA, TOSHITAKA
Format Patent
LanguageEnglish
French
German
Published 07.07.1982
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
INFORMATION STORAGE
PHYSICS
PULSE TECHNIQUE
STATIC STORES
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Summary:The output buffer circuit is capable of taking three output states, high level, low level and high impedance. … The buffer circuit includes a detector circuit (Zener diode D3, resistors R5 and R6, and transistor Q5) for detecting power source voltage (Vcc) applied to the buffer circuit. When the power source voltage becomes high (e.g. 7V) the detector circuit (D3, R5, R6, Q5) switches the buffer circuit to high impedance output state (diode D3 is turned ON, so that transistor Q5 is turned ON to connect the collector of a transistor Q2 to ground G and to turn the output stage transistors Q3, Q2, Q4 OFF).
Bibliography:Application Number: EP19810305914