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1-8. Input-Tolerant and Output Power-Down Protection Functions Available with Each Series

The following table shows whether each CMOS logic IC series provides the input-tolerant and output power-down protection functions.

By family input-tolerant and output power-down protection functions
Series	Part Number	Operating voltage range (V)	Input-tolerant function	Output power-down protection
Standard CMOS	TC4000B TC4500B	3 to 18	-^*1	-
High-Speed	TC74HC	2 to 6	-^*1	-
High-Speed	TC74HCT	4.5 to 5.5	-^*1	-
Advanced	TC74AC	2 to 5.5	-	-
Advanced	TC74ACT	4.5 to 5.5	-	-
Very-High-Speed	74VHC 74VHC9	2 to 5.5	✔	-
	74VHCT	4.5 to 5.5	✔	✔
	74VHCV	1.8 to 5.5	✔	✔
Low-Voltage	74LCX	1.65 to 3.6	✔	✔
Very-Low-Voltage	TC74VCX	1.2 to 3.6	✔	✔

*1: TC4049BF/BP, TC4050BF/BP, TC74HC4049BP/BF/BFT, 74HC4049D, TC74HC4050BP/BF/BFT and 74HC4050D have the input-tolerant function that allows level shifting from a higher voltage to a lower voltage.