June 26, 2009

Integeated Circuits(IC)

In real this is how an IC looks like..

First IC that was ever created ..

Introduction of
Integrated Circuits are usually called ICs or chips. They are complex circuits which have been etched onto tiny chips of semiconductor (silicon). The chip is packaged in a plastic holder with pins spaced on a 0.1" (2.54mm) grid which will fit the holes on stripboard and breadboards. Very fine wires inside the package link the chip to the pins.

IC pin numbersPin numbers
The pins are numbered anti-clockwise around the IC (chip) starting near the notch or dot. The diagram shows the numbering for 8-pin and 14-pin ICs, but the principle is the same for all sizes.

Common ICs

Below, the most common ICs are shown. (Those parts that I use most.)
For extensive details on each part, see the corresponding data sheet.
The part numbers of the SN74 series ICs are written with a 74, often followed by LS or HC.
LS (Low power Shottky) indicates low power consumption. HC indicates the device is High speed C-MOS (Complementary-Metal Oxide Semiconductor), and is also a low power consumption IC.
The average current consumption for each type of chip is listed below.
The current shown is for when the device is in a LOW state output. In the case of the LOW state output, current consumption is much greater than in the HIGH state output.


Several kinds of ICs are not available in the LS or HC type. For example, SN7445 is not available in LS or HC. It is available only as SN7445, the normal type.

NameFunctionVccPin Assign(Top View)Remarks
SN74HC00Quad 2 Input NAND+5V2 input NAND circuits entered 4 pieces
SN74HC04Hex Inverters+5V Inverter circuit entered 6 pieces
+5VOne of output takes LOW state serected by the binary input.
+5V Open collector type of 7442

Max current of output is 80mA.
SN74LS47 BCD to Segment
+5V Front View
Driving IC of ‚Vsegments LED.
Open collector type
Max resistance voltage:15V
6 and 9 disply type:
Related 74247
SN74HC73 Dual JK-FFs
With Clear
+5V2 pieces of JK-FF
SN74LS90Decade Counter+5V Asynchronous 2 + 5 counter.
Async preset : 9
Async clear
SN74HC93 4-Bit Binary
+5VAsynchronous 2 + 8 counter.
SN74HC123 Dual Retriggaerable
Single Shot
+5V Single shot resister holds the output in the required time from the input states goes to ON.
The output holding time corresponds to C(capacitor) and R(resistor) connected to the Cext(External capacitor) and Rext(External resistor) respectivly.
SN74LS247 BCD to Segment
+5V Front View

6 and 9 disply type:
Related 7447
SN74LS290Decade Counter+5V This type is the same as the SN7490, with a different layout of pins.
SN74HC390 Dual Decade
+5V Type that inserted 2 SN7490.
Presetting 9 is omitted .
4040B 12Bit Binary
+5V 12-stage Binary counter.
It has a clear function.
Counts downward with an external clock pulse.
4541B Progarammable
+5V Programmable 16 stage binary counter.
Used in RC oscillation circuits, power reset, output control circuits.
Tap outputs of 8, 10, 13, 16 bits are possible by the control terminal.
NE555Timer+4.5 to +16V Max frequency: 500kHz
Temperature drift: 0.005%/°C.
Max output current: 200mA.
Delay time setting
:several micro sec to several hours
LM386N-1Low frequency electric power amplifier+4 to 12V Max output: 660mW
Load: 8 to 32-ohm
Waiting current: 4mA
LM386N-4Low frequency electric power amplifier+5 to 18V

Max output: 1.25W
Load: 8 to 32-ohm
Waiting current: 4mA
TA7368PLow frequency electric power amplifier+2 to +10V Max output: 1.1W
Load: 4 to 16-ohm
uPC319Voltage comparator 5 to 18V

Standard general use comparator with single power supply/dual power supply operation

Other compatible ICs
7975 Multi-melody IC
+1.5 to +3V Melody IC that includes 8 pre-programmed melodies.
It has 2 sound resources and a settable envelope.

Fur Elise
Heavenly Creatures
Ich bin ein musikante
Valse Favorite
Home On The Range

Three Terminal Voltage Regulator

It is very easy to get stabilized voltage for ICs by using a three terminal voltage regulator.
The power supply voltage for a car is +12V - +14V. At this voltage, some ICs can not operate directly except for the car component ICs. In this case, a three terminal voltage regulator is necessary to get the required voltage.
The three terminal voltage regulator outputs stabilized voltage at a lower level than the higher input voltage. A voltage regulator cannot put out higher voltage than the input voltage. They are similar in appearance to a transistor.

On the left in the photograph is a 78L05. The size and form is similar to a 2SC1815 transistor.
The output voltage is +5V, and the maximum output current is about 100mA.
The maximum input voltage is +35V. (Differs by manufacturer.)

On the right is a 7805. The output voltage is +5V, and maximum output current is 500mA to 1A. (It depends on the heat sink used)
The maximum input voltage is also +35V.

There are many types with different output voltages.
5V, 6V, 7V, 8V, 9V, 10V, 12V, 15V, 18V

Component Lead of Three Terminal Voltage Regulator

Because the component leads differ between kinds of regulators,

you need to confirm the leads with a datasheet, etc.

    Example of 78L05
    Part number is printed on the flat face of the regulator, and indicates the front.

    Right side : Input
    Center : Ground
    Left side : Output

Example of 7805
Part number is printed on the flat face of the regulator, and indicates the front.

Right side : Output
Center : Ground
Left side : Input

Opposite from 78L05.


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Electronics is the study and use of electrical that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves. and semiconductors. The pure study of such devices is considered as a branch of physics, while the design and construction electronic circuits to solve practical problems is called electronic engineering.

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