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comparison of TTL and CMOS

written 5.0 years ago by

teamques10 ★ 64k

modified 2.1 years ago by

binitamayekar ★ 6.4k

Parameters	TTL	CMOS
1] Design.	It is designed using BJTs.	It is designed using FETs.
2] Density of logic gates.	It has greater density of logic gates since a logic gate consists of BJTs and extra components.	It is designed using FETs. it has lesser density of logic gates since a logic gate consists of two FETs.
3] Power.	10MW per gate	10 nW per gate
4] Cost.	It is relatively cheaper.	It is expensive.
5] Damage due to electrostatic charge.	It is relatively cheaper, less susceptible	It is expensive, more susceptible to damage.
6] Power consumption.	Consumes more power at rest.	Consumes less power at rest.
7] Propagation delay.	10ns	25ns-50ns.
8] Voltage level range.	0 to VDD, low level is 0 to 1/3 VOD and high level is 2/3 VDD to VDD.	0 to VCC where VCC is 4.75 - 5.25 V, 0 - 0.8 V creates logic level 0 & 2v - vcc creates logic 1.
9] Fan-out.	10	50
10] Fan-in.	12-14	Greater than 10
11] Basic gates used.	NAND gates	NAND -NOR gates.
12] Noise margin.	0.5V	1.5V
13] Noise immunity.	Worse than CMOS	Better than TTL

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2.8 years ago by teamques10 ★ 64k