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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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The datasheets for some CMOS logic ICs do not show the maximum operating frequency. What is their maximum operating frequency?

The maximum operating frequency can be estimated as follows using the propagation delay times (tpLH and tpHL) shown in the datasheet.

Maximum operating frequency ≈ 1 / (tpLH + tpHL)

The following table shows the propagation delay times of typical ICs and the results of the above equation for each series.
Propagation delay times depend on the IC function. For ICs other than the typical ICs shown below, see the datasheet for propagation delay times and use them to calculate the maximum operating frequency. Propagation delay times also depend on wire lengths and loads in actual applications.
The maximum operating frequencies shown below should be considered only as a guide. Be sure to verify that the ICs you have selected operate properly under actual usage conditions.

Type

Series Name

Series No.

One-Gate Logic (L-MOS) Equivalents

Operating Voltage Range (V)

Output current*1, IOUT

tpLH (ns) 
CL = 50 pF

tpHL (ns) 
CL = 50 pF

Result of Maximum Operating Frequency Calculation (MHz)

For 5-V Systems

Standard

TC40xxB
TC45xxB

TC4S
TC4W

3 to 18

±0.51
(at 5.0 V)

200
(at 5.0 V)

200
(at 5.0 V)

3

High Speed

TC74HC

TC7S
TC7W

2 to 6

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

23
(at 4.5 V)

23
(at 4.5 V)

22

TC74HCT

TC7WT

4.5 to 5.5

28
(at 4.5 V)

31
(at 4.5 V)

17

Advanced

TC74AC

-

2 to 5.5

± 24
(at 4.5 V)

8.5
(at 4.5 V)

8.5
(at 4.5 V)

59

TC74ACT

 

4.5 to 5.5

9.0
(at 5.0 V)

9.0
(at 5.0 V)

56

Very High Speed

TC74VHC
74VHC

TC7SH
TC7WH

2 to 5.5

± 8.0
(at 4.5 V)

8.5
(at 5.0 V)

8.5
(at 5.0 V)

59

TC74VHC9
74VHC9

10
(at 5.0 V)

10
(at 5.0 V)

50

TC74VHCT
74VHCT

TC7SET*2

9.5
(at 5.0 V)

9.5
(at 5.0 V)

53

TC74VHCV
74VHCV

 

4.5 to 5.5

± 16
(at 4.5 V)

8.5
(at 5.0 V)

8.5
(at 5.0 V)

59

For low-voltage systems

Medium Speed

TC74LCX
74LCX

TC7SZ*3
TC7PZ
TC7WZ

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

± 24
(at 3.0 V)

6.5
(at 3.3 V)

6.5
(at 3.3 V)

77

High Speed

TC74VCX

7UL

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

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

4.4
(at 3.3 V)

4.4
(at 3.3 V)

114

*1: Output current values are specified in the DC Characteristics table shown in the datasheet. Absolute maximum rated output current is specified separately.
*2: The TC7SET series does not have an output power-down protection function.  
*3: 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

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