M74HCT646 datasheet(7/12 Pages) STMICROELECTRONICS

7 / 12 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

Min.

Typ.

Max.

Min.

Max.

tTLH

tTHL

Output Transition Time

4.5

tPLH

tPHL

Propagation Delay Time

(BUS - BUS)

4.5

150

tPLH

tPHL

Propagation Delay Time

(CLOCK - BUS)

4.5

150

tPLH

tPHL

Propagation Delay Time

(SELECT - BUS)

4.5

150

tPZL

tPZH

3-State Output Enable Time

(G, DIR - BUS)

4.5

RL =1 K

Ω

4.5

150

RL =1 K

Ω

tPLZ

tPHZ

3-State Output Disable Time

(G, DIR - BUS)

4.5

RL =1 K

Ω

fMAX

Maximum Clock Frequency

4.5

MHz

tW(H)

tW(L)

Minimum Pulse Width

4.5

Minimum Set-up Time

4.5

Minimum Hold Time

4.5

CIN

Input Capacitance

CI/O

Bus Terminal Capacitance

CPD (*)

Power Dissipation Capacitance

for HCT646

for HCT648

(*) 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/8 (per bit)

M74HCT646/648

7/12

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