What are the differences among the general-purpose logic ICs?

General-purpose logic ICs (CMOS logic ICs/one-gate logic (L-MOS)) are made into series (family) based on operating voltage range, propagation delay time (speed), output current, input tolerance, etc.

These are often used for the purpose of signal conversion, distribution, switching, etc. in the control board of electronic equipment and the interface between boards.

The features of each series are as follows.

  • Standard (TC40/TC45, TC4S/TC4W):
    Covers a wide operating voltage range from 3 to 18 V and guarantees electrical characteristics at three supply voltages: 5 V, 10 V, and 15 V.
  • High speed (TC74HC/TC74HCT, TC7S/TC7W/TC7WT)
    Widely used with a 5 V power supply
  • Advanced (TC74AC/TC74ACT)
    Suitable as transmission line drivers because of high output current (24 mA)
  • Very High Speed (TC74VHC/74VHC/TC74VHCT/74VHCT/TC74VHCV/74VHCV, TC7SH/TC7WH/TC7PH/TC7SET)
    Combines high speed and low noise; most widely used for applications requiring high-speed operations because of the highest speed at 5 V under light-load conditions
  • For low-voltage systems
    Low voltage (TC74LCX/74LCX, TC7SZ/TC7PZ/TC7WZ)
    Even at a VCC of 3.3 V, provides speed equivalent to the conventional 5 V high-speed series (AC/VHC series) and guarantees correct operation at 2.5 V and 1.8 V
    Very low voltage (TC74VCX, 7UL).
    The very low Voltage is a series that achieves even faster speeds and VCC = 1.2 V (7UL series is a series that guarantees operation with 0.9 V).
Table-1. Major Characteristics of General-Purpose Logic ICs

Type

Series Name

 CMOS Logic ICs
Series No.		 One-Gate Logic
( L-MOS )
Equivalent		 Operating
Voltage Range
VCC (V)

Propagation
Delay Time*1
tpLH, tpHL (ns)

 Output
Current *2
IOUT (mA)

Input-Tolerant
Function

 Output
Power-down
Protection

For 5 V Systems

Standard

TC40xxB
TC45xxB

TC4S
TC4W

3 to 18

200
( at 5.0 V)

±0.51
(at 5.0 V)

△*3

-

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）

△*3

-

TC74HCT

TC7WT

4.5 to 5.5

31
(at 4.5 V)

 -

Advanced

TC74AC

  

2 to 5.5

8.5
(at 4.5 V)

±24
(at 4.5 V)

-

-

TC74ACT

  

4.5 to 5.5

9.0
(at 5.0 V)

Very High Speed

TC74VHC
74VHC

TC7SH
TC7WH

2 to 5.5

8.5
(at 5.0 V)

±8.0
(at 4.5 V)

●

-

TC74VHC9
74VHC9

10
(at 5.0 V)

TC74VHCT
74VHCT

TC7SET

4.5 to 5.5

9.5
(at 5.0 V)

●

●*4

TC74VHCV
74VHCV

  

1.8 to 5.5

8.5
(at 5.0 V)

±16
(at 4.5 V)

●

●

For low
voltage systems

Low Voltage

TC74LCX
74LCX

TC7SZ
TC7PZ
TC7WZ

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

6.5
(at 3.3 V)

±24
(at 3.0 V)

●

●*5

Very Low Voltage

TC74VCX

7UL

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

4.2
(at 2.3 V)

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

●

●

*1: Maximum propagation delay time of typical ICs (TC4001, TC74HC244, TC74HCT244, TC74AC244, TC74ACT244, 74VHC244, 74VHC9541 (An-Yn), VHCT244, VHCV244, 74LCX244, and TC74VCX244) at -40 to 85 °C, except for the TC4001 for which the maximum propagation delay time at 25 °C is shown.
*2: Those output current values are from DC Characteristics table of the datasheet. In addition, they are specified in absolute maximum ratings.
*3: TC4049BF/BP, TC4050BF/BP, TC74HC4049BP/BF/BFT, 74HC4049D, TC74HC4050BP/BF/BFT and 74HC4050D have the input-tolerant function that allows level shifting from a higher voltage to a lower voltage.
*4: The TC7SET series and TC7SZU04/TC7WZU04 does not have an output power-down protection function.
*5: 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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