I was given spec sheets for two chips: 74LS00 and the74HCT00 I\'m asked: \"What

Question

I was given spec sheets for two chips: 74LS00 and the74HCT00 I'm asked: "What are the noise margins for the output ofthe 74LS00 driving the 74HCT00 and the output of the 74HCT00driving a 74LS00?" What is the general formula for figuring this out? Whatdo I look for in the spec sheets? Thanks in advance. I was given spec sheets for two chips: 74LS00 and the74HCT00 I'm asked: "What are the noise margins for the output ofthe 74LS00 driving the 74HCT00 and the output of the 74HCT00driving a 74LS00?" What is the general formula for figuring this out? Whatdo I look for in the spec sheets? Thanks in advance.

Explanation / Answer

The noise margin is given by 0 = [VIL(max) of load gate] -[VoL(max) of driver gate] 1 = [VoH(min) of driver gate] -[VoH(max) of load gate] Nose margin for the output of 74LS00 driving the 74HCT00is 1 = [VoH(min) of driver gate] -[VoH(max) of load gate] Nose margin for the output of 74LS00 driving the 74HCT00is 0 = [VIL(max) of 74HCT00] -[VoL(max) of 74LS00] 1 = [VoH(min) of 74LS00] -[VoH(max) of 74HCT00] Nose margin for the output of 74HCt00 driving the 74LS00is 0 = [VIL(max) of 74LS00] -[VoL(max) of 74HCT00] 1 = [VoH(min) of 74HCT00] -[VoH(max) of 74LS00] 0 = [VIL(max) of 74HCT00] -[VoL(max) of 74LS00] 1 = [VoH(min) of 74LS00] -[VoH(max) of 74HCT00] Nose margin for the output of 74HCt00 driving the 74LS00is 0 = [VIL(max) of 74LS00] -[VoL(max) of 74HCT00] 1 = [VoH(min) of 74HCT00] -[VoH(max) of 74LS00] 1 = [VoH(min) of 74LS00] -[VoH(max) of 74HCT00] Nose margin for the output of 74HCt00 driving the 74LS00is 0 = [VIL(max) of 74LS00] -[VoL(max) of 74HCT00] 1 = [VoH(min) of 74HCT00] -[VoH(max) of 74LS00] Nose margin for the output of 74HCt00 driving the 74LS00is 0 = [VIL(max) of 74LS00] -[VoL(max) of 74HCT00] 1 = [VoH(min) of 74HCT00] -[VoH(max) of 74LS00] 0 = [VIL(max) of 74LS00] -[VoL(max) of 74HCT00] 1 = [VoH(min) of 74HCT00] -[VoH(max) of 74LS00] 1 = [VoH(min) of 74HCT00] -[VoH(max) of 74LS00]

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