SN74LS378DW 查看數據表（PDF） - Motorola => Freescale

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SN74LS378DW

OCTAL D FLIP-FLOP WITH ENABLE; HEX D FLIP-FLOP WITH ENABLE; 4-BIT D FLIP-FLOP WITH ENABLE

Motorola => Freescale 

SN54/74LS377 • SN54/74LS378 • SN54/74LS379

TRUTH TABLE

E

CP

Dn

Qn

Qn

H

X

No

No

Change Change

L

H

H

L

L

L

L

H

L = LOW Voltage Level

H = HIGH Voltage Level

X = Immaterial

AC WAVEFORMS

CP

D OR E

Q

SN54 / 74LS377

1.3 V

ts(H)

*

1.3 V

1/fmax

tW

ts(L)

th(H)

tPLH

1.3 V

1.3 V

th(L)

1.3 V

tPHL

1.3 V

Figure 1. Clock to Output Delays Clock Pulse

Width, Frequency, Setup and Hold Times Data

or Enable to Clock

CP

E, D

Q

SN54 / 74LS378

1.3 V

ts(H)

1/fmax

tW

ts(L)

th(H)

*

1.3 V

tPHL

1.3 V

1.3 V

th(L)

1.3 V

tPLH

1.3 V

Figure 2. Clock to Output Delays Clock Pulse

Width, Frequency, Setup and Hold Times Data

or Enable to Clock

CP

E, D

Q

SN54 / 74LS379

1.3 V

ts(H)

*

1.3 V

1/fmax

tW

ts(L)

th(H)

tPLH

1.3 V

1.3 V

th(L)

1.3 V

tPHL

1.3 V

*The shaded areas indicate when the input is permitted to change for predictable output performance.

Figure 3. Clock to Output Delays Clock Pulse

Width, Frequency, Setup and Hold Times Data,

Enable to Clock

FAST AND LS TTL DATA

5-537

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