Transistor-transistor logic circuit with hysteresis

Details Transistor-transistor logic circuit with hysteresis Transistor-transistor logic circuit with hysteresis

H - Electricity

03

K

328/136, 328/196

H03K 19/088 (2006.01)

Patent

CA 1194149

ABSTRACT: "Transistor-transistor logic circuit with hysteresis." A TTL circuit having a pair of current sources (R1/VCC and R2/VCC) and a pair of transistors (Q1 and Q2) arranged a a standard TTL input/inverting configuration has hysteresis in the input signal (VX) for providing noise protection. A hysteresis circuit (10) suitably containing another current source (R3/VCC) coupled to the base of the inverting transistor (Q2) and a rectifier (12) coupled between the collector of the inverting transistor and the current source (R1/VCC) coupled to the base of the input transistor (Q1) provides the hysteresis at the circuit switching points.

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