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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
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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.

Series Part Number

Operating voltage range (V)

Input-tolerant function

Output power-down protection

Standard CMOS TC4000B
3 to 18 - -
High-Speed TC74HC 2 to 6 - -
TC74HCT 4.5 to 5.5
Advanced TC74AC 2 to 5.5 - -
TC74ACT 4.5 to 5.5
Very-High-Speed 74VHC
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

Usage Considerations of CMOS Logic ICs

Handling of Unused Input Pins
Input Rise and Fall Time Specifications
Multiple Outputs from a General-Purpose CMOS Logic IC Come Into Conflict (Short-Circuiting)
Connecting a Load Capacitance to a CMOS Output Pin
Calculating the Operating Supply Current and Power Dissipation
Level Shifting Using an Input-Tolerant Function
Example of Application of the Power-Down Protection Function (Partial Power-Down)
Types of Noise to be Noted
Countermeasures for Reducing Switching Noise
Countermeasures for Signal Reflection
Countermeasures for Crosstalk
Countermeasures for Hazards
Countermeasures for Metastability
Countermeasures for Latch-Up
Countermeasures for ESD Protection


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