CS4141 IDL Notes. I. Quick Overview of IDL Prototyping Unit

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1 CS4141 IDL Notes IDL-800 Prototyping System The IDL-800 logic panels are powerful tools for any logic designer. They enable a wide range of IC s to be used in a breadboard experiment. I. Quick Overview of IDL Prototyping Unit A. Become familiar with the IDL-800 chassis Note that the rear panel (forward-facing near-vertical panel at the back of unit) contains the master power on-off switch. In addition, the left side of the panel contains a function generator which can generate an electrical signal in three forms: sinusoidal, triangular, and square wave. Both the frequency and amplitude can be varied. On the right side of the panel, there is a digital voltmeter that can measure various voltages applied to circuits. Note that the voltmeter can be connected either to banana plugs or the small wire connectors that are used to connect circuit pins together. B. Study the flat portion of the IDL-800 chassis. On the left side are two +5VDC (non-variable) power outputs, plus a variable DC supply with

2 outputs of 0-15 and 0-(-15) V. On the right are wire connector-tobanana plug adapters and other inputs (which will not be used in this lab). At the bottom are some function switches that can apply +/ 5V, and two pulse switches which will apply a 1 (5V) or 0 (0V) as long as they are held down. There are also 8 data switches that can be switched to apply 1 or 0 (5V or 0V) to any input. At the rear of the flat board are data indicators, including two seven-segment displays which will display numbers, and 8 light-emitting diode (LED) indicators which can be connected to circuit pins to indicate whether a one (5V) or a 0 (0V) is present. A 1 will light up the LED; a 0 turns it off. C. The center of the flat chassis area is the prototype board. At the top and bottom are power busses. When these are connected by the small solid copper wires to one of the supplies (red to +, blue to ground or 0), all the other holes in the respective lines connect to that voltage element. D. Note that the prototype board contains two main areas of pins. When a chip is plugged into any set of pins in such a way that it bridges the wide space in the middle of each pin group, all pin holes in each vertical column which contains a chip pin are also connected to that pin. Thus other components, inputs, or voltages can be connected to each pin of the circuit being evaluated.

3 E. Take some time to study the chassis, and ask questions of the instructor or TA if necessary. II. IDL Control Panels (Used) A. Power Source Panel: The power source panel is directly to the left of the breadboard. You will use it to power and ground your IC s. There is a +5V hole next to each power bus strip and a ground hole next to each ground bus strip. Connect these holes to the bus strips when you conduct your experiments. Do not use the +V, -5V, or V holes. Your experiment will not work. B. 3-Way Switch Panel: The 3-way switch panel is directly below the power source panel. You will use these switches to provide a constant signal of 0 or 1, that you can change over time. These switches have three settings: +5V, 0V, and 5V. Use the 0V setting to represent 0 and the +5V setting to represent a 1. Both of the holes next to each switch are output holes. C. Pulse Switch Panel: The pulse switch panel is directly to the right of the 3-way switch panel. Use it to supply a signal that is a zero most of the time and momentarily a 1. You can also use it to supply a signal that is 1 most of the time and momentarily 0. This can be handy as a slow motion clock signal. The holes next to A and B provide 0 until the switch is pressed. A 1 is momentarily provided and then the signal goes back to 0. The holes next to A (A complement) and B (B complement) provide 1 until the switch is pressed. A 0 is momentarily provided and then the signal goes back to 1. Both of the holes next to each switch are output holes D. 8-bit Data Switch Panel: The 8-bit data switch panel is directly to the right of the pulse switch panel. You can use any of the switches to provide a constant signal of 1 or 0. The only difference between these switches and the 3-way switches is that these switches can t supply a 5V signal. Both of the holes next to each switch are output holes E. 8-Bit Data Display Panel: The 8-bit data display panel is directly below the digital voltmeter panel. This panel allows you to observe the value of 8 different signal at the same time. If a 0 is supplied to a data display, the light will be off. If a 1 is supplied to a data display, the light will be on. There are two holes for each data display. Use the left hole for input to the display and the right hole to send the signal to some other location if required.

4 F. Signal Generation Panel: The signal generation panel is located in the upper left hand corner of the IDL panel. It contains: a. The ON-OFF switch for the entire logic panel b. A dial labeled Amplitude which controls the intensity of the 8- bit data display lamps. c. A switch with 5 different Frequency-range settings. d. A Dial labeled 1-10 which controls/adjusts the output frequency with a selected range. e. A hole labeled Out. When you want to set up a periodic clock signal connect a wire from this hole to your circuit (0-8V). f. A switch which selects 3 different Signal-waveform settings. Keep this switch at the square wave setting. III. IDL Control Panels (Not used) A. Digital Voltmeter Panel: The digital voltmeter(dvm) panel is in the upper right hand corner of the IDL panel. You will not use this panel in your experiments since the only voltages we are using are 0V and 5V. B. Seven Segment Display Panel: The seven segment display panel is directly below the signal generation panel. You will not use this panel in your experiments. C. Adapter Panel: The Adapter panel is directly to the right of the breadboard. You will not use this panel in your experiments since it has to do with the receiving signals from external sources. IV. IDL Logic Panel A. Bus Strips: There are pairs of bus strips on the top, middle, and bottom of the breadboard. The red line is next to one of the bus strips in each pair, and a blue line next to the other bus strip. Use the bus strip next to the red line for power (+5V). Use the bus strip next to the blue line for ground. There are two groups of connected holes on a bus strip. One group starts at hole #3 on the breadboard and ends at hole #31. The other group starts at hole #34 on the breadboard and ends at hole #62. When you supply power to hole #3 you automatically supply power to all the other holes in that group. This means you can use short wires to power and ground your IC s. Caution: Since the two groups of connected holes are not connected to each other, connect them by placing one end of a short jumper wire in hole #31 and the other end in hole #34 of the bus strip. B. IC Connections: In between the bus strips there are two 10X64 matrices of holes. In each matrix the rows are assigned the letters A-J and the columns are numbered There is a channel running between rows E and F. When you build your logic circuits half of the pins of the IC will be in row E and the other half will be in row F. For any given column, the holes from rows A-E are connected and the holes from F-J are connected. This makes it easy to send the output of a particular pin of an IC to up to four different locations. For example, suppose you have an IC with an output pin in hole #E-25. If

5 you insert a wire in A-25, B-25, C-25, or D-25 the other end of the wire will have the same voltage as that output pin, E-25. V. Guidelines to Setup Logic Panel Use the wiring setup procedure provided in the LAB ASSIGNMENT sheet. If one has not been provided or you are connecting you own design you may use the following steps as a guide: 1. Make sure the IDL logic panel is turned off. 2. Connect the two groups of each bus strip by placing a short wire from hole #31 to hole #34 on each bus strip. 3. Connect power to each bus power strip. 4. Connect ground to each ground bus strip. 5. Find the first chip in your circuit. 6. First, ground the chip by connecting the chips ground pin, normally pin 7(check IC diagram), to the nearest ground bus strip. 7. Next, supply power to the chip by connecting the chips power pin, Vcc, normally pin 14(check IC diagram), to the nearest power bus strip. 8. Repeat steps 5-7 for each IC in your circuit. 9. Make connections between the IC according to your circuit design (or the instructions on the LAB ASSIGNMENT sheets).

6 10. Finally, turn the IDL logic panel on and conduct the experiment. Note: If no power, check that the workbench s electrical plug strip has also been turned on. VI. IC Hardware Configurations 1. The IC s used in this lab are TTL logic parts which contain multiple copies, 2,4,6, or 8, of a logic gate. 2. The chips may have 14, 16, 18, 22, or more pins for accessing the logic functions. The pins provide for access to the logic operators input and output signals, and the chips power voltage (Vcc) and ground. Ground (0V.) connection Notch LS XXX 14-Pin Chip Outline Power (+5V.) connection 3. Each chip has a notch (or dimple) on one end. The pins are number counter clockwise starting with pin 1. Pin 1 is always the first physical pin to the left of the chips notch when viewed from above. Check the IC s data sheet to determine which pins are used for power and ground connection. Do not connect these voltages backwards. This is the easiest method to destroy an IC. IC s are susceptible to static electricity but are otherwise very rugged. You TA will show you how protect the IC s. Unfortunately the labs do not have grounding straps. 4. Care must be taken when plugging IC s into the breadboard. The pins are easily bent and may break off. Especially if they have been bent in several previous labs. IC s may be harder to install if they are new. The rows of pins point slightly outward, away from each other. When inserting the chip, tip it slightly to the side and start the pins from one side first. When they are in their respective holes, tip the other side down. If the pins are not quite aligned apply a small amount of

7 pressure or even use a pencil to help adjust individual pins. If you have to force it something is wrong! Stop and try again. 5. The IDL-800 s are rugged but need your special attention. Wires or pins, while being inserted into holes on the control panel or the breadboard area, may be broken off in these holes. The IDL may no longer be useable. The IDL unit has redundant holes but those are only a temporary fix and may prohibit some of the more complex experiments later in class where multiple connections are needed. Inform your TA of any such problems that you discover. Acknowledgement: Prof. Herman Harrison