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An open collector output processes an IC's output through the base of an internal bipolar junction transistor (BJT), whose collector is exposed as the external output pin. For NPN open collector outputs, the emitter of the NPN transistor is internally connected to ground, [1] so the NPN open collector internally forms either a short-circuit ...
See also: Diode logic § Active-high AND logic gate Open-collector buffers connected as wired AND.. The wired AND connection is a form of AND gate.When using open collector or similar outputs (which can be identified by the ⎐ symbol in schematics), wired AND only requires a pull up resistor on the shared output wire.
The output voltages at the collector load resistors R C1 and R C3 are shifted and buffered to the inverting and non-inverting outputs by the emitter followers T4 and T5 (shaded blue). The output emitter resistors R E4 and R E5 do not exist in all versions of ECL. In some cases 50 Ω line termination resistors connected between the bases of the ...
open-collector (28) SN74GTL2006: 74x2007 1 12-bit GTL to 3.3V TTL level translator open-collector (28) SN74GTL2007: 74x2010 1 10-bit level translator (24) SN74GTL2010: 74x2014 1 4-bit GTL to TTL transceiver three-state and open-collector (14) SN74GTL2014: 74x2031 1 9-bit Futurebus address/data transceiver three-state and open-collector (48 ...
IIL circuit. The heart of an I2L circuit is the common emitter open collector inverter. Typically, an inverter consists of an NPN transistor with the emitter connected to ground and the base biased with a forward current from the current source. The input is supplied to the base as either a current sink (low logic level) or as a high-z floating ...
The output open collector transistor, T11, can sink currents up to 100 mA, and is protected from polarity reversal with a reverse diode. [4] [5] The circuit does not provide protection against excessive current or overheating. [4] [5]
The circuit can be explained by viewing the transistor as being under the control of negative feedback. From this viewpoint, a common-collector stage (Fig. 1) is an amplifier with full series negative feedback. In this configuration (Fig. 2 with β = 1), the entire output voltage V out is placed contrary and in series with the input voltage V in.
In this circuit, the base terminal of the transistor serves as the input, the collector is the output, and the emitter is common to both (for example, it may be tied to ground reference or a power supply rail), hence its name. The analogous FET circuit is the common-source amplifier, and the analogous tube circuit is the common-cathode amplifier.