I was given spec sheets for twochips: 74LS00 and the 74HCT00 I\'m asked: \"Are t

Question

I was given spec sheets for twochips: 74LS00 and the 74HCT00 I'm asked: "Are the voltage levels for the two devicescompatible? Briefly explain." 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 twochips: 74LS00 and the 74HCT00 I'm asked: "Are the voltage levels for the two devicescompatible? Briefly explain." 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 twochips: 74LS00 and the 74HCT00 I'm asked: "Are the voltage levels for the two devicescompatible? Briefly explain." What is the general formula for figuring this out? Whatdo I look for in the spec sheets? Thanks in advance.

Explanation / Answer

To check for the compatibility, it is necessary to ensure thatthe output characteristics of the driving gate match the inputcharacteristics of the driven gate. If the HIGH and LOW output voltages of the driven gate fallswithin the permissible range of the HIGH and LOW input voltages ofthe load gate , then the two are compatible. That is if VoH (min) of 74LS00 is less than VIH (min) of 74HCT00 VoH (max) of 74LS00 is less than VIH (max) of 74HCT00 VoH (max) of 74LS00 is less than VIH (max) of 74HCT00 VoL (min) of 74LS00 is less than VIL (min) of 74HCT00 VoL (min) of 74LS00 is less than VIL (min) of 74HCT00 VoL (max) of 74LS00 is less than VIL (max) of 74HCT00 Then 74LS00 can drive 74HCT00 Similarly you can check the compatibility for thereverse VoL (max) of 74LS00 is less than VIL (max) of 74HCT00 Then 74LS00 can drive 74HCT00 Similarly you can check the compatibility for thereverse

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