CSIS CSIS 4381 3-Input AND from Transistors Illustrates basic use of IDL-800 Illustrates construction of gates Illustrates the “transistor bleed-through”

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Presentation transcript:

CSIS CSIS Input AND from Transistors Illustrates basic use of IDL-800 Illustrates construction of gates Illustrates the “transistor bleed-through” problem that affects the AND circuit.

CSIS CSIS 4381 Transistors in Series A B Out C V+ Construction of 3-Input (A,B,C) AND from transistors. Note the resistor and output are at the “bottom”. Three inputs (from switches)

CSIS CSIS 4381 Connection to Power Next slide shows the connection to power. + 5 volt power supply. Connects to top transistor A B Out C V+

CSIS CSIS 4381 Connection to Ground A B Out C V+ After output. Through the current-limiting resistor.

CSIS CSIS 4381 Connection to Logic Switches A B Out C V+ Switches connect to each transitor. Switches are either: 0-off, no voltage, or 1-On, +5 volts

CSIS CSIS 4381 Measuring Output with the Meter A B Out C V Digital Volt Meter connects to output, and to the ground. It measures the voltage differential between those two points.

CSIS CSIS 4381 Measuring Output with a LED The output can be connected to a Light Emitting Diode (LED) rather than to the DVM. A voltage of around 2.5 and greater will cause the LED to light. The LED is already wired on one end to the ground. A current limiting resistor ensure that the LED does not receive too great a voltage and current.

CSIS CSIS 4381 Voltage – 1 input on A B Out C V Illustrates the “transistor bleed-through” effect.

CSIS CSIS 4381 Voltage – 2 inputs on A B Out C V Illustrates the “transistor bleed-through” effect. Two transistors, larger voltage detected. This voltage is large enough to be detected as a “1” by the LED.

CSIS CSIS 4381 Voltage 3 inputs on A B Out C V+ 4.07

CSIS CSIS 4381 “Bleed-Through” voltage can light an LED, and be detected as a “1” A B Out C V Illustrates the “transistor bleed-through” effect. Two transistors, larger voltage detected. This voltage is large enough to be detected as a “1” by the LED.

CSIS CSIS 4381 Use NANDs or NORs Need to support AND, OR and NOT as Boolean operations Manufacturing cost: –Single silicon layering don’t need to support two places (layers) to connect resistors, or measure output AND/OR different layer from NOT –Complete set of operations – NAND or NOR can be wired for any logic Fabricate a chip with one type of gate Avoids AND “transistor bleed-through” problem Actual modern logic implementations will vary as technologies evolve