IDL-800 DIGITAL LABProbador lgicoEl principal propsito de este evaluador de circuitos es proveer convenientemente a los usuarios de una fuente de CD, un generador de funciones, un vltmetro digital, un arreglo 8 bits de LEDs, dos displays de 7 segmentos y switches lgicos, todo en el mismo aparato. Permite tambin crear una interface entre ste equipo e instrumentos perifricos a travs de los adaptadores tipo banana y BNC que trae integrados.

IDL-800 Prototyping SystemThe IDL-800 logic panels are powerful tools for any logic designer. Theyenable a wide range of ICs 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 themaster power on-off switch. In addition, the left side of the panelcontains a function generator which can generate an electrical signalin three forms: sinusoidal, triangular, and square wave. Both thefrequency and amplitude can be varied. On the right side of the panel,there is a digital voltmeter that can measure various voltages appliedto circuits. Note that the voltmeter can be connected either to bananaplugs or the small wire connectors that are used to connect circuitpins together.B. Study the flat portion of the IDL-800 chassis. On the left side aretwo +5VDC (non-variable) power outputs, plus a variable DC supply with

outputs of 0-15 and 0-(-15) V. On the right are wire connector-tobananaplug adapters and other inputs (which will not be used in thislab). 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 asthey are held down. There are also 8 data switches that can beswitched to apply 1 or 0 (5V or 0V) to any input. At the rear of theflat board are data indicators, including two seven-segment displayswhich will display numbers, and 8 light-emitting diode (LED) indicatorswhich 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 topand bottom are power busses. When these are connected by the smallsolid copper wires to one of the supplies (red to +, blue to ground or0), all the other holes in the respective lines connect to that voltageelement.D. Note that the prototype board contains two main areas of pins. When achip is plugged into any set of pins in such a way that it bridges thewide space in the middle of each pin group, all pin holes in eachvertical column which contains a chip pin are also connected to thatpin. Thus other components, inputs, or voltages can be connected toeach pin of the circuit being evaluated.

E. Take some time to study the chassis, and ask questions of theinstructor or TA if necessary.II. IDL Control Panels (Used)A. Power Source Panel: The power source panel is directly to the left ofthe breadboard. You will use it to power and ground your ICs. Thereis a +5V hole next to each power bus strip and a ground hole next toeach ground bus strip. Connect these holes to the bus strips when youconduct 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 powersource panel. You will use these switches to provide a constant signalof 0 or 1, that you can change over time.These switches have three settings: +5V, 0V, and 5V. Use the 0Vsetting 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 ofthe 3-way switch panel. Use it to supply a signal that is a zero mostof the time and momentarily a 1.You can also use it to supply a signal that is 1 most of the time andmomentarily 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 ismomentarily provided and then the signal goes back to 0. The holesnext to A (A complement) and B(B complement) provide 1 until theswitch is pressed. A 0 is momentarily provided and then the signal goesback to 1.Both of the holes next to each switch are output holesD. 8-bit Data Switch Panel: The 8-bit data switch panel is directly to theright of the pulse switch panel. You can use any of the switches toprovide a constant signal of 1 or 0. The only difference between theseswitches and the 3-way switches is that these switches cant supply a 5V signal.Both of the holes next to each switch are output holesE. 8-Bit Data Display Panel: The 8-bit data display panel is directlybelow the digital voltmeter panel. This panel allows you to observe thevalue of 8 different signal at the same time. If a 0 is supplied to adata display, the light will be off. If a 1 is supplied to a datadisplay, the light will be on.There are two holes for each data display. Use the left hole for inputto the display and the right hole to send the signal to some otherlocation if required.

F. Signal Generation Panel: The signal generation panel is located in theupper left hand corner of the IDL panel. It contains:a. The ON-OFF switch for the entire logic panelb. 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 frequencywith a selected range.e. A hole labeled Out. When you want to set up a periodic clocksignal 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 theupper right hand corner of the IDL panel. You will not use this panelin your experiments since the only voltages we are using are 0V and 5V.B. Seven Segment Display Panel: The seven segment display panel isdirectly below the signal generation panel. You will not use this panelin your experiments.C. Adapter Panel: The Adapter panel is directly to the right of thebreadboard. You will not use this panel in your experiments since ithas to do with the receiving signals from external sources.IV. IDL Logic PanelA. Bus Strips: There are pairs of bus strips on the top, middle, andbottom of the breadboard. The red line is next to one of the bus stripsin each pair, and a blue line next to the other bus strip. Use the busstrip next to the red line for power (+5V). Use the bus strip next tothe blue line for ground.There are two groups of connected holes on a bus strip. One groupstarts at hole #3 on the breadboard and ends at hole #31. The othergroup starts at hole #34 on the breadboard and ends at hole #62.When you supply power to hole #3 you automatically supply power to allthe other holes in that group. This means you can use short wires topower and ground your ICs.Caution: Since the two groups of connected holes are not connected toeach other, connect them by placing one end of a short jumper wire inhole #31 and the other end in hole #34 of the bus strip.B. IC Connections: In between the bus strips there are two 10X64 matricesof holes. In each matrix the rows are assigned the letters A-J and thecolumns are numbered 1-64. There is a channel running between rows Eand F. When you build your logic circuits half of the pins of the ICwill 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 theholes from F-J are connected. This makes it easy to send the output ofa particular pin of an IC to up to four different locations. Forexample, suppose you have an IC with an output pin in hole #E-25. Ifyou insert a wire in A-25, B-25, C-25, or D-25 the other end of thewire will have the same voltage as that output pin, E-25.

V. Guidelines to Setup Logic PanelUse the wiring setup procedure provided in the LAB ASSIGNMENTsheet. If one has not been provided or you are connecting you owndesign 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 shortwire 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 busstrip.7. Next, supply power to the chip by connecting the chips powerpin, Vcc, normally pin 14(check IC diagram), to the nearestpower bus strip.8. Repeat steps 5-7 for each IC in your circuit.9. Make connections between the IC according to your circuitdesign (or the instructions on the LAB ASSIGNMENT sheets).

10. Finally, turn the IDL logic panel on and conduct theexperiment.Note: If no power, check that the workbenchs electrical plugstrip has also been turned on.VI. IC Hardware Configurations1. The ICs used in this lab are TTL logic parts which containmultiple copies, 2,4,6, or 8, of a logic gate.2. The chips may have 14, 16, 18, 22, or more pins for accessing thelogic functions. The pins provide for access to the logicoperators input and output signals, and the chips power voltage(Vcc) and ground.

3. Each chip has a notch (or dimple) on one end. The pins are numbercounter clockwise starting with pin 1. Pin 1 is always the firstphysical pin to the left of the chips notch when viewed fromabove.Check the ICs data sheet to determine which pins are used forpower and ground connection. Do not connect these voltagesbackwards. This is the easiest method to destroy an IC.ICs are susceptible to static electricity but are otherwise veryrugged. You TA will show you how protect the ICs. Unfortunatelythe labs do not have grounding straps.4. Care must be taken when plugging ICs into the breadboard. Thepins are easily bent and may break off. Especially if they havebeen bent in several previous labs. ICs may be harder toinstall if they are new. The rows of pins point slightlyoutward, away from each other. When inserting the chip, tip itslightly 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

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