<p style="margin-left:24px; text-align:justify"><span style="font-size:14px">The manufacturers prefer to use discrete components like diodes, transistors, resisters, capacitors etc. in the integrated form, ICs. ICs either employ TTL (Transistor to transistor logic) or MOS logic (Metal Oxide Semiconductor). Some of the TTL chips commonly used are listed below:</span></p>

<p style="margin-left:24px; text-align:justify">&nbsp;</p>

<ul>
	<li style="text-align:justify">
	<p><span style="font-size:14px">7400 Quad 2-input NAND</span></p>
	</li>
	<li style="text-align:justify">
	<p><span style="font-size:14px">7402 Quad 2-input NOR</span></p>
	</li>
	<li style="text-align:justify">
	<p><span style="font-size:14px">7405 Quad 2-input AND</span></p>
	</li>
	<li style="text-align:justify">
	<p><span style="font-size:14px">7432 Quad 2-input OR</span></p>
	</li>
	<li style="text-align:justify">
	<p><span style="font-size:14px">7486 Quad 2-input EX-OR</span></p>
	</li>
	<li style="text-align:justify">
	<p><span style="font-size:14px">7489 64 bits RAM</span></p>
	</li>
	<li style="text-align:justify">
	<p><span style="font-size:14px">74121 Monostable Multivibrator</span></p>
	</li>
	<li style="text-align:justify">
	<p><span style="font-size:14px">555 Astable Multivibrator</span></p>
	</li>
	<li style="text-align:justify">
	<p><span style="font-size:14px">8223 256 bits ROM</span></p>
	</li>
	<li style="text-align:justify">
	<p><span style="font-size:14px">741 Operational Amplifier</span></p>
	</li>
	<li style="text-align:justify">
	<p><span style="font-size:14px">747 Dual Operational Amplifier</span></p>
	</li>
	<li style="text-align:justify">
	<p><span style="font-size:14px">LM 324 Quad Operational Amplifier</span></p>
	</li>
</ul>