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Are there any guidelines for inputs with a slowly rising or falling edge?

The input rise and fall times of a general-purpose CMOS logic IC are specified in the Recommended Operating Conditions table.

These are the maximum limits that do not cause a malfunction due to output oscillation.

If a slowly rising or falling signal is applied, a current spike occurs during switching, causing Vcc and GND bounce, which might result in output oscillation or a malfunction. Even a gate or a buffer is subject to a malfunction or oscillation. Thus, care should be exercised with regard to control signals such as clocks.

Use Schmitt trigger ICs for inputs with a slowly rising or falling edge.While input voltage is between VP and VN, DC current flowing between the power supply and ground will increase. We recommend that you do not use extremely slow input signals.

 

List of input rising and trailing time in recommended operating conditions
Vcc series
High speed Advance
5V logic
3.3V low speed
low voltage
middle speed
low voltage
high speed
CMOS
Logic
ICs
One-
Gate
Logic
CMOS
Logic
ICs
CMOS
Logic
ICs
One-
Gate
Logic
CMOS
Logic
ICs
One-
Gate
Logic
CMOS
Logic
ICs
One-
Gate
Logic
TC74HC TC7W TC74AC TC74VHC TC7SH
TC7WH
TC74LCX TC7SZ
TC7WZ
TC74VCX 7UL1G
5V 500ns 500ns 20ns/V 20ns/V 20ns/V 10ns/V *1 5ns/V - -
3.3V - - 100ns/V 100ns/V 100ns/V 10ns/V 10ns/V 10ns/V 10ns/V

*1:LCX07

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