74VHC27 查看數據表（PDF） - STMicroelectronics

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74VHC27

TRIPLE 3-INPUT NOR GATE

STMicroelectronics 

74VHC27

Table 8: Capacitive Characteristics

Symbol

Parameter

CIN Input Capacitance

CPD Power Dissipation

Capacitance

(note 1)

Test Condition

Value

TA = 25°C

-40 to 85°C -55 to 125°C Unit

Min. Typ. Max. Min. Max. Min. Max.

6 10

10

10 pF

17

pF

1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without

load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/3 (per gate)

Figure 3: Test Circuit

CL =15/50pF or equivalent (includes jig and probe capacitance)

RT = ZOUT of pulse generator (typically 50Ω)

Figure 4: Waveform - Propagation Delays (f=1MHz; 50% duty cycle)

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