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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.
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In what sequence should I turn on and off the power and input signals?

[Figure: input/output equivalent circuit of TC74HC/HCT]
[Figure: input/output equivalent circuit of TC74HC/HCT]

The following figure shows the I/O-equivalent circuit of the TC74HC/HCT series.

To meet the absolute maximum ratings, the power-on sequence must be as follow: (1) GND, (2) Vcc, (3) input signals. For the power-off sequence, perform the power-on sequence in reverse order.


Input-tolerant devices (i.e., devices that do not have a diode in the forward direction from inputs to the power source) such as TC74VHC/VHCT, TC74LCX and TC74VCX can accept input signals even when no power is supplied. Therefore, the order of (2) and (3) is not significant. However, the absolute rated input diode current (IIK) must not be exceeded.

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