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Classification of CMOS Logic ICs and Overview of Each Series

Classification of CMOS Logic ICs and overview of each series

Since the launch of the first Standard CMOS series (4000 series),
Toshiba has released successive generations of high-speed and low-voltage CMOS logic ICs.

Toshiba continues to supply CMOS logic ICs with a wide operating range (1.2 V to 18 V) suitable for various applications.

FAQ : What are the differences among the general-purpose logic IC series?

Type Series Part number Operating voltage range (V) Propagation delay time (ns)*1 Output current (mA)*2 Input-tolerant function*3

Output power-down protection*3

For 5-V Systems



3 to 18 200
(at 5.0V)
(at 5.0V)
- -
High-Speed CMOS TC74HC 2 to 6 23
(at 4.5V)
±4.0 or ±6.0
(at 4.5V)
- -
TC74HCT 4.5 to 5.5



TC74AC 2 to 5.5 8.5
(at 4.5V)
(at 4.5V)
- -
TC74ACT 4.5 to 5.5

Very-High-Speed CMOS

2 to 5.5 8.5
(at 4.5V)
(at 4.5V)
4.5 to 5.5
1.8 to 5.5 ±16
(at 4.5V)
For low-voltage systems Low-Voltage CMOS TC74LCX
1.65 to 3.6 6.5
(at 3.0V)
(at 3.0V)
Very-Low-Voltage CMOS TC74VCX 1.2 to 3.6 4.2
(at 2.3V)
(at 3.0V)

*1: Maximum propagation delay time of typical ICs (TC4001, 74HC244, TC74AC244, 74VHC244, 74LCX244, and TC74VCX244) at 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. Absolute maximum rated output current is specified separately.
*3: The terms “tolerant function” and “power-down protection” are sometimes used interchangeably. The input- and output-tolerant functions may be referred to as input and output power-down protection, respectively.

Chapter1 Overview of CMOS Logic ICs

What is a Logic IC?
What is a Standard Logic IC?
Types of Standard Logic ICs
Equipment in Which CMOS Logic ICs are Used
Reasons Why CMOS Logic ICs are Used


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