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Transcript
Lab #2: TTL and CMOS Specifications SAIT- ENT-DIGI-260 Lab #2: TTL and CMOS Specifications Updated January 2010 Print pages 4 and 5 Objectives: 1. Plot transfer characteristic curves for TTL NAND (7400) and CMOS NAND (4011) gates. 2. Determine the power supply and logic input current requirements of logic devices. 3. Compare measured values with those in the specification sheets. Pre-Lab Preparation: 1. Attend lectures and review the theory of electrical properties of gates and devices. 2. Read the textbook chapters, manufacturer specification sheets and on-line materials that relate to the TTL and CMOS logic families. Equipment Required: 1. 2. 3. 4. 5. 6. 7. Experimenter’s board with 5V power supply Function Generator Oscilloscope DC meter PC, with Excel, Access to specification sheets Parts kit Additional Notes: 1. Remember to offset the function generator. Marks will be deducted. 2. Remember how to properly use an ammeter. 3. Do not make measurements while using the probe or an output LED, as these will have a loading effect on your circuit and skew the measurements. 4. Circuit simulations are not required for this lab. 5. Graphs must be neat and labeled appropriately. You may use Excel to create the graphs. 6. This is a 2-person group lab. 1 Lab #2: TTL and CMOS Specifications SAIT- ENT-DIGI-260 Procedure 1: Transfer Characteristics Curves 1. Using a 7400 and/or 74LS00 IC, create a transfer characteristics curve by doing the following: a. See the manufacturer specification sheets for a sample of the transfer characteristics curve. b. Connect one input of the NAND gate to Vcc, making the NAND gate an inverter. Use a 1kΩ pot as a voltage divider across Vcc and ground to provide a variable input voltage to the gate. See Figure 1 below. c. Measure a number of values of VIN and VOUT using DC meters. See figure #1. Note: Due to Vt+ and Vt- (hysteresis), turn the potentiometer in the same direction for accurate measurements. d. Using EXCEL, plot the transfer characteristic curve by recording as many measurements as are necessary to create an accurate graph. e. On the graph, indicate the specified values of VOH (min), and VOL (max). Note: You may do this manually (neatly) on the printed graph. f. Print the graph and the tabulated data. Figure 1: Set-up for TTL Transfer Characteristics 2. Repeat the procedure above using the 4011B (CMOS) device. 3. Demonstrate these circuits and display the graphs or values to your instructor. 2 Lab #2: TTL and CMOS Specifications SAIT- ENT-DIGI-260 Procedure 2: Measure power supply current 1. For the TTL device, look up the minimum and maximum values for I CCH and ICCL in the specification sheet. Record these values in Table #1. 2. For the TTL device, measure the ICCH by connecting the gates so they all provide a logic high, and measure ICCL by connecting the gates to provide a logic low. Record these values in Table #1. 3. Demonstrate a sample measurement to your instructor. 4. Answer the question at the end of this lab. Procedure 3: Measure input currents 1. Using a 74LS00, measure gate input currents using the following procedure: a. Look up the typical values for IIH and IIL in the specification sheet. Record these values in Table #2. b. Tie one input of the gate high. Measure the current flowing into the other input with a logic low applied, and again with a logic high applied. Record your results in Table #2. c. Tie both inputs of the gate together. Measure the current flowing in these two inputs with a logic low applied, and again with a logic high applied. Record your results in Table #2. 2. Repeat the procedure above using a 4011B. Record values in Table #3. 3. Demonstrate a sample measurement to the instructor. 4. Answer the questions at the end of this lab. 3 Lab #2: TTL and CMOS Specifications SAIT- ENT-DIGI-260 Table #1 (TTL ICCH and ICCL from procedure 2): Specification Manufacturer spec Measured value ICCH Typ. ICCH Max ICCL Typ. ICCL Max Table #1: ICCH and ICCL Table #2 (TTL IIH and IIL from procedure 3): Specification Specification Measured Single Measured Two Sheet Input Input IIH Max IIL Max Table #2: IIH and IIL for TTL device Table #3 (CMOS IIH and IIL from procedure 3): Specification Specification Measured Single Sheet Input IIH Max IIL Max Table #3: IIH and IIL for CMOS device 4 Lab #2: TTL and CMOS Specifications SAIT- ENT-DIGI-260 Answer the following questions. 1. In procedure 2, were your measurements within specification? Explain. 2. In procedure 3 and the TTL device, why did you get the results you did when comparing the single gate input and the two gate input values? You will need to use the specification sheet to aid in your explanation. 3. In procedure 3 and the CMOS device, why were the measurements troublesome? Signatures: Procedure 1 circuits: ___________ Procedure 2 circuit: ___________ Procedure 3 circuits: ___________ Submission: Submit all graphs, values and answered questions as a report. The report should include: cover sheet with basic information (such as the lab number, names, date, etc…) printed graphs measured values pages 4 and 5 from this lab (with instructor signatures) Student Names: _____________ _______________ Date: ___________ 5