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

In the datasheet, the rise and fall times of general-purpose CMOS logic ICs are specified in the operating ranges in which their functional operation is guaranteed.
Use CMOS logic ICs within the operating ranges to prevent a malfunction due to output oscillation etc.
If a slowly rising or falling signal (a low slew rate signal) is applied to an input, a current spike occurs during switching, causing VCC and GND bounce, which might result in output oscillation or a malfunction.

Use ICs with a Schmitt-trigger input for slowly changing inputs. However, in the case of excessively slowly changing inputs, even ICs with a Schmitt-trigger input might not be able to suppress noise on power supply or signal lines, resulting in output oscillation or instability.

The following table shows the rise and fall times of a typical IC*1 in each series.

Type

Series Name

Series No.

One-Gate Logic (L-MOS) Equivalents

Operating Voltage Range (V)

Propagation Delay Times*1, tpLH and tpHL (ns)

Output Current*2, IOUT (mA)

Rise and Fall Times at 3.3 V (ns/V)

Rise and Fall Times at 5 V (ns/V)

For 5-V Systems

Standard

TC40xxB
TC45xxB

TC4S
TC4W

3 to 18

200
(at 5.0 V)

±0.51
(at 5.0 V)

0 to 10000*6

0 to 5000*6

High Speed

TC74HC

TC7S
TC7W

2 to 6

23
(at 4.5 V)

±4.0 or 6.0
(at 4.5 V)
(±2.0 in the case of TC7S)

0 to 1000

0 to 500

TC74HCT

TC7WT

4.5 to 5.5

28
(at 4.5 V)

 

0 to 500

Advanced

TC74AC

 

2 to 5.5

8.5
(at 4.5 V)

±24
(at 4.5 V)

0 to 100

0 to 20

TC74ACT

 

4.5 to 5.5

9.0
(at 5.0 V)

 

0 to 10

Very High Speed

TC74VHC
74VHC

TC7SH
TC7WH

2 to 5.5

8.5
(at 5.0 V)

±8.0
(at 4.5 V)

0 to 100

0 to 20

TC74VHC9
74VHC9

10
(at 5.0 V)

  - *5

 - *5

TC74VHCT
74VHCT

TC7SET*3

4.5 to 5.5

9.5
(at 5.0 V)

 

0 to 20

TC74VHCV
74VHCV

 

1.8 to 5.5

8.5
(at 5.0 V)

± 16
(at 4.5 V)

0 to 20 ms/V

0 to 1 ms/V

For low-voltage systems

Medium Speed

TC74LCX
74LCX

TC7SZ*4
TC7PZ
TC7WZ

1.65 to 3.6
(1.65 to 5.5 in the case of TC7SZ/PZ/WZ)

8.5
(at 5.0 V)

± 24
(at 3.0 V)

0 to 10

 

High Speed

TC74VCX

7UL

1.2 to 3.6
(0.9 to 3.6 in the case of 7UL)

6.5
(at 3.0 V)

± 24
(at 3.0 V)
(±8.0 in the case of 7UL)

0 to 10

 

*1: Maximum propagation delay time of typical ICs (TC4001, TC74HC244, TC74AC244, TC74VHC244, TC74LCX244, and TC74VCX244) at 85°C, except for the TC4001 for which the maximum propagation delay time at 25°C is shown
*2: Output current values are specified in the DC Characteristics table shown in the datasheet. Absolute maximum rated output current is specified separately.
*3: The TC7SET series does not have an output power-down protection function.  
*4: The ICs of the TC7SZ series in the fSV package do not have an output power-down protection function except those with an open-drain output.
*5: Rise and fall times are not specified because the TC74VHC9 and 74VHC9 series provide Schmitt-trigger inputs.
*6: Rise and fall times are not specified in the datasheet. The values shown above should be considered only as a guide for creating a design.

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