How many amperes is the output current of a general-purpose logic IC able to drive?
The current value that can be driven by the output of the general-purpose 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
Table-1 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.
Comparing absolute maximum ratings (Output Current IOUT and Power Supply /GND Current ICC/IGND) of Main Products in Each Series
Typical product used in the table-2
General-purpose logic IC :74xx244
One-gate logic (L-MOS:TC7S00, TC7PZ34, other series is TC7xx125)
The values in table-2 are values of representative products and show the tendency of each series. (This may change depending on the function you select.) Use this as a guide for designing.
Output current IOUT and DC Vcc current/ground current ICC/IGND are not specified for the Standard series.
特性 |
符号 （单位） |
系列 |
|||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
标准型 |
高速型 |
进阶型 |
超高速型 |
低压型 |
超低压型 |
||||||||||
CMOS逻辑IC |
单门逻辑IC |
CMOS逻辑IC |
单门逻辑IC |
CMOS逻辑IC |
CMOS逻辑IC |
CMOS逻辑IC |
单门逻辑IC |
CMOS逻辑IC |
单门逻辑IC |
CMOS逻辑IC |
单门逻辑IC |
||||
TC40 TC45 |
TC4S |
TC74HC |
TC7S |
TC7W |
TC74AC |
74VHC |
74VHCV |
TC7SH |
74LCX |
TC7SZ |
TC7PZ |
TC74VCX |
7UL1G |
||
7UL2G |
|||||||||||||||
输出电流 |
IOUT （mA） |
- |
- |
±35 |
±12.5 |
±35 |
±50 |
±25 |
±50 |
±25 |
±50 |
±50 |
±50 |
±50 |
±25 |
电源／ |
Icc／IGND （mA） |
- |
- |
±75 |
±25 |
±37.5 |
±200 |
±75 |
±100 |
±50 |
±100 |
±50 |
±100 |
±100 |
±50 |
注：即使是瞬间，也不得超过绝对最大额定值中的任何一个值。
即使在绝对最大额定和工作范围内的温度、电流和电压下使用IC时，如果IC持续暴露于重负载（例如，高温、大电流、高压和温度大幅变化）环境下，其可靠性也会大幅降低。请参阅《东芝半导体可靠性手册》（特别是关于操作注意事项和降额的章节）以及关于各器件可靠性的信息（例如，可靠性测试报告和估计故障率），务必保证应用时的可靠性。
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