dm74ls377 National Semiconductor Corporation, dm74ls377 Datasheet - Page 3

• Manufacturer Part Number: dm74ls377
• Description: Octal D Flip-flop With Common Enable And Clock
• Manufacturer: National Semiconductor Corporation

Switching Characteristics
Functional Description
The ’LS377 consists of eight edge-triggered D flip-flops with
individual D inputs and Q outputs The Clock (CP) and En-
able input (E) are common to all flip-flops
When E is LOW new data is entered into the register on the
next LOW-to-HIGH transition of CP When E is HIGH the
register will retain the present data independent of the CP
Logic Symbol
Logic Diagram
Symbol
f
t
t
max
PLH
PHL
Maximum Clock Frequency
Propagation Delay
CP to Q
n
Parameter
V
CC
e a
5 0V T
V
GND
CC
e
e
A
Pin 20
e a
Pin 10
3
Truth Table
H
L
X
25 C
e
e
e
LOW Voltage Level
Immaterial
HIGH Voltage Level
E
H
L
L
Min
R
30
L
e
2 kX C
Inputs
L
L
CP
X
TL F 9831 – 2
L
e
15 pF
Max
25
25
D
H
X
L
n
No Change
Output
Q
H
L
Units
MHz
n
TL F 9831 – 3
ns