ELET 3132L - Lab #1

PROCEDURE:
Steps 1 through 3: typical TTL (Transistor-Transistor Logic) Gate
Figure 38: TTL Logic Gate
Step 1. Construct the circuit shown in Figure 38 above with the +5V supply off and the function
generator off. Turn the function generator amplitude all the way down.
Step 2. Turn on the +5V supply. Turn on the function generator and set it for a sine wave, 1kHz,
5VP-P with a 2.5VDC offset (0 to 5V signal). Use the oscilloscope to determine at what
input voltage the Q1 turns on (VOUT = 0) and at what input voltage Q1 turns OFF
(VOUT = 5V).
Step 3. Fill out Table 1 as required.
NM V V
Table 1: Noise Margins
= − LO
Lo HI OUTHI INHI
LO IN OUT
NM = V − V
What logic function does this TTL gate implement?__________________________
ELET 3132L Experiment #1 22 of 25