Set up the circuit shown in Fig. 1. Use the Sweep & Capture program to control the Keithley 230 power supply, the HP 3478A DMM and the Keithley 197A DMM. Use the "Set Voltage" inputs to vary the input voltage over the range of 0 to 2 V in .02 V increments. Set the current limit to 2 mA. The "Choose Measurement" input should be set to "Two Voltages". Assign names to the "HP Data" and the "Keithley Data" files. Then run the sweep. Repeat this for each of the four TTL gate types available. Plot V_O vs. V_I for all four types on the same graph.

Set up the circuit of Fig. 2. Manually set the Keithley 197A to measure current with a range of 200 mA. Manually increase the Keithley 230 power supply and observe the output voltage and current. Note the power supply voltage at which the output voltage from the gate is less than 1 V but in no case should the current be allowed to exceed 70 mA even if the output voltage is still above 1 V. Call this voltage V_max . Choose an increment so as to collect about 100 points. Note that the transistor doesn't begin to conduct until V_BE = 0.7 V. Use the Sweep & Capture program to vary the Keithley 230 voltage source from 0 V to V_max and record V_OH vs. I_OH. The "Choose Measurement" should be "Voltage (HP) & Current (Keithley)". Set the current limit to 2 mA. Repeat for all four TTL types. Plot V_OH vs. I_OH for all four types on the same graph.

Set up the circuit of Fig. 3. Manually set the Keithley 197A to measure current with a range of 200 mA. Manually increase the Keithley 230 power supply and observe the output voltage and current. Note the power supply voltage at which the output voltage from the gate is approximately 0.4 V. Call this voltage V_max . Choose an increment so as to collect about 100 points. Use the Sweep & Capture program to vary the Keithley 230 voltage source from 0 V to V_max and record V_OL vs. I_OL. The "Choose Measurement" should be "Voltage (HP) & Current (Keithley)". Set the current limit to 2 mA. Repeat for all four TTL types. Plot V_OL vs. I_OL for all four types on the same graph.

a) Set up the circuit of Fig. 4.

b) Adjust V_I to 2.4 V and measure I_IH for each of the four types of gates.

c) Adjust V_I to 0.4 V and measure I_IL for each of the four types of gates.

From the voltage transfer curves, determine the following values for each type of gate:

a) V_OH b) V_OL c) V_IL

d) V_IH e) NM_H f) NM_L

500F