5-537

FAST AND LS TTL DATA

SN54/74LS377

• SN54/74LS378 • SN54/74LS379

TRUTH TABLE

E

CP

Dn

Qn

Qn

H

X

No

Change

No

Change

L

H

H

L

L

L

L

H

L = LOW Voltage Level

H = HIGH Voltage Level

X = Immaterial

AC WAVEFORMS

SN54 / 74LS377

SN54 / 74LS378

SN54 / 74LS379

1.3 V

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

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1/fmax

tW

ts(H)

th(H)

ts(L)

th(L)

CP

tPLH

tPHL

E, D

Q

*

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1/fmax

tW

ts(H)

th(H)

ts(L)

th(L)

CP

tPHL

tPLH

D OR E

Q

*

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1.3 V

1/fmax

tW

ts(H)

th(H)

ts(L)

th(L)

CP

tPHL

tPLH

E, D

Q

*

Figure 1. Clock to Output Delays Clock Pulse

Width, Frequency, Setup and Hold Times Data

or Enable to Clock

Figure 2. Clock to Output Delays Clock Pulse

Width, Frequency, Setup and Hold Times Data

or Enable to Clock

Figure 3. Clock to Output Delays Clock Pulse

Width, Frequency, Setup and Hold Times Data,

Enable to Clock