M74HCT138RM13TR 查看數據表（PDF） - STMicroelectronics

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M74HCT138RM13TR

3 TO 8 LINE DECODER (INVERTING)

STMicroelectronics 

M74HCT138

AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)

Test Condition

Value

Symbol

Parameter

VCC

(V)

tTLH tTHL Output Transition

Time

4.5

tPLH tPHL Propagation Delay

Time (A, B, C - Y)

4.5

tPLH tPHL Propagation Delay

Time (G1 - Y)

4.5

tPLH tPHL Propagation Delay

Time (G2 - Y)

4.5

TA = 25°C

-40 to 85°C -55 to 125°C Unit

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

8 15

19

22 ns

17 30

38

45 ns

16 30

38

45 ns

19 30

38

45 ns

CAPACITIVE CHARACTERISTICS

Test Condition

Value

Symbol

Parameter

VCC

(V)

TA = 25°C

-40 to 85°C -55 to 125°C Unit

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

CIN Input Capacitance

5 10

10

10 pF

CPD Power Dissipation

Capacitance (note

52

pF

1)

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

TEST CIRCUIT

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

RT = ZOUT of pulse generator (typically 50Ω)

4/9

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