he problem of the VOH(min) of a TTL IC being too low to drive a CMOS circuit and meet the CMOS requirement of VIH(min) is usually easily overcome by:

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adding an external pull-up resistor to vcc

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adding a fixed voltage- divider bias resistive network at the output of the ttl device

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avoiding this condition and only using ttl to drive ttl

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adding an external pull- down resistor to ground

Q. he problem of the VOH(min) of a TTL IC being too low to drive a CMOS circuit and meet the CMOS requirement of VIH(min) is usually easily overcome by: