CMOS Vs TTL Logic voltage levels

[sankar.m8]

Friends..
I was confused with the logic levels of CMOS & TTL Logic..
In Wikipedia Logic level - Wikipedia, the free encyclopedia it was given that

Logic Low Logic High
CMOS 0 V to VDD/2 VDD/2 to VDD VDD = supply voltage
TTL 0 V to 0.8 V 2 V to VCC VCC = 5 V ±10%

But i have some other resource Logic Voltage Thresholds for TTL, CMOS, LVCMOS, and GTLP IC families which says both have same logic threshold.

Please help me....

Thanks in advance

 

[dave9000]

Some CMOS families/components have input levels compliant to the TTL standard, and output levels going from GND to VCC (nearly).

Most other CMOS have an input threshold placed somewhere between GND and VDD, usually near VCC/2 but with no guarantee; outputs are still rail to rail.

So the output of any CMOS with VCC>2V can drive a TTL compatible input.

 

[kak111]

In your attachment is shown several logic families



Logic Voltage Thresholds for TTL, CMOS, LVCMOS, and GTLP IC families

Look these.....

Glue Logic IC Family Selection Guide

IC Glue Logic Family Descriptions

 

[krishna2728]

Logic signal voltage levels : LOGIC GATES

check this it maybe helpful