M74HCT367 datasheet(5/11 Pages) STMICROELECTRONICS

5 / 11 page

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

Symbol

Parameter

Test Conditions

Value

Unit

VCC

(V)

(pF)

TA =25

54HC and 74HC

-40 to 85

74HC

-55 to 125

54HC

Min.

Typ.

Max.

Min.

Max.

Min.

Max.

tTLH

tTHL

Output Transition

Time

2.0

tPLH

tPHL

Propagation

Delay Time

(for HCT367 only)

2.0

150

tPLH

tPHL

Propagation

Delay Time

(for HCT368 only)

2.0

150

tPZL

tPZH

Output Enable

Time

2.0

150

tPLZ

tPHZ

Output Disable

Time

2.0

CIN

Input Capacitance

CPD (*)

Power Dissipation

Capacitance

fot HCT367

for HCT368

(*) 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 operting current can be obtained by the following equation. ICC(opr) = CPD

•VCC •fIN +ICC/6 (per Channel)

TEST CIRCUIT ICC (Opr.)

* INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF

SWITCHING CHARACTERISTICS TEST.

CPD CALCULATION

CPD is to be calculated with the following

formula by using the measured value of

ICC (opr.) in the test circuit opposite.

CPD =

ICC (opr)

fIN

× VCC

In determining the typical value of CPD,a

relatively high frequency of 1 MHz was ap-

plied to fIN, in order to eliminate any error

caused by the quiescent supply current.

M54/M74HCT367/368

5/11

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