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# How many amperes of current can an output pin drive?

The current value that can be driven by the output of the CMOS logic IC is explained based on the value described in the data sheet.Related items are DC output current IOUT and DC Vcc current/ground current ICC/IGND.
IOUT is the maximum current that can be driven by one output, and ICC/IGND is the maximum current that can be driven by the entire IC.
Note that the following formula does not always hold when the number of outputs is n.

ICC/IGND / n = IOUT

Example: TC74ACT244FT
The following is a copy of the Absolute Maximum Ratings table from the TC74ACT244FT datasheet. The TC74ACT244FT provides an IOUT of 50 mA and an ICC of 200 mA. When all the eight outputs provide an equal amount of current, the amount of current that each output can drive is calculated to be:

200 mA / 8 = 25 mA

Therefore, not all the outputs can drive an output current of 50 mA as specified as IOUT simultaneously.

Comparison of the absolute maximum rated output current Iout and DC Vcc current/ground current ICC/IGND among typical ICs of different CMOS logic series
Typical products used in the table

CMOS logic ICs : 74xx244
One-gate logic ICs  : TC7S00, TC7PZ34, TC7xx125 for the other series

The following table shows the characteristics of the typical IC in each series as an overall indication of their output drive capabilities. (Different logic functions have different characteristics.)
Use this table as a guide when creating a design.
Output current IOUT and DC Vcc current/ground current ICC/IGND are not specified for the Standard series.

Characteristic

Symbol

(Unit)

Series

Standard

High Speed

Very High Speed

Low Voltage,

Medium Speed

Low Voltage,

High Speed

CMOS Logic ICs

One-Gate Logic ICs

CMOS Logic ICs

One-Gate Logic ICs

CMOS Logic ICs

CMOS Logic ICs

CMOS Logic ICs

One-Gate Logic ICs

CMOS Logic ICs

One-Gate Logic ICs

CMOS Logic ICs

One-Gate Logic ICs

TC40

TC45

TC4S

TC4W

TC74HC

TC74HCT

TC7S

TC7W

TC7WT

TC74AC

TC74ACT

74VHC

74VHCT

74VHCV

TC7SH

TC7WH

TC7SET

74LCX

TC7SZ

TC7WZ

TC7PZ

TC74VCX

7UL

Output current

IOUT

(mA)

-

-

±35

±12.5

±35

±50

±25

±50

±25

±50

±50

±50

±50

±25

DC VCC current/
ground current

Icc/IGND

(mA)

-

-

±75

±25

±37.5

±200

±75

±100

±50

±100

±50

±100

±100

±50

Note: Any one of the absolute maximum ratings must not be exceeded even instantaneously.
Even when an IC is used at a temperature, current, and voltage within the absolute maximum rated and operating ranges, its reliability could degrade substantially if it is continuously exposed to heavy loads (e.g., high temperature, high current, high voltage, and large temperature changes). Be sure to build reliability into applications, referring to the Toshiba Semiconductor Reliability Handbook (particularly the sections on handling precautions and derating) and information on the reliability of individual devices (e.g., reliability test reports and estimated failure rates).

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