NSC DM54LS377W Octal d flip-flop with common enable and clock Datasheet

DM54LS377/DM74LS377
Octal D Flip-Flop with Common Enable and Clock
General Description
Features
The ’LS377 is an 8-bit register built using advanced low
power Schottky technology. This register consists of eight
D-type flip-flops with a buffered common clock and a buffered common input enable. The device is packaged in the
space-saving (0.3 inch row spacing) 20-pin package.
Y
Y
Y
8-bit high speed parallel registers
Positive edge-triggered D-type flip-flops
Fully buffered common clock and enable inputs
Connection Diagram
Dual-In-Line Package
TL/F/9831 – 1
Order Number DM54LS377E, DM54LS377J,
DM54LS377W, DM74LS377WM or DM74LS377N
See NS Package Number
E20A, J20A, M20B, N20A or W20A
Pin Names
E
D0–D7
CP
Q0–Q7
C1995 National Semiconductor Corporation
TL/F/9831
Description
Enable Input (Active LOW)
Data Inputs
Clock Pulse Input (Active Rising Edge)
Flip-Flop Outputs
RRD-B30M115/Printed in U. S. A.
DM54LS377/DM74LS377 Octal D Flip-Flop with Common Enable and Clock
May 1992
Absolute Maximum Ratings (Note)
Note: The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The
parametric values defined in the ‘‘Electrical Characteristics’’
table are not guaranteed at the absolute maximum ratings.
The ‘‘Recommended Operating Conditions’’ table will define
the conditions for actual device operation.
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
b 55§ C to a 125§ C
DM54LS
DM74LS
0§ C to a 70§ C
b 65§ C to a 150§ C
Storage Temperature Range
Recommended Operating Conditions
Symbol
DM54LS377
Parameter
DM74LS377
Units
Min
Nom
Max
Min
Nom
Max
4.5
5
5.5
4.75
5
5.25
VCC
Supply Voltage
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
IOH
High Level Output Current
IOL
Low Level Output Current
TA
Free Air Operating Temperature
ts (H)
ts (L)
Setup Time HIGH or LOW
Dn to CP
20
20
10
10
ns
th (H)
th (L)
Hold Time HIGH or LOW
Dn to CP
5.0
5.0
5.0
5.0
ns
ts (H)
ts (L)
Setup Time HIGH or LOW
E to CP
10
20
10
20
ns
th (H)
th (L)
Hold Time HIGH or LOW
E to CP
5.0
5.0
5.0
5.0
ns
tw (H)
tw (L)
CP Pulse Width HIGH or LOW
20
20
20
20
ns
2
2
V
0.7
0.8
V
b 0.4
b 0.4
mA
8
mA
70
§C
4
b 55
V
125
0
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
(Note 1)
Max
Units
b 1.5
V
VI
Input Clamp Voltage
VCC e Min, II e b18 mA
VOH
High Level Output
Voltage
VCC e Min, IOH e Max
VIL e Max
Low Level Output
Voltage
VCC e Min, IOL e Max
VIH e Min
DM74
0.35
0.5
IOL e 4 mA, VCC e Min
DM74
0.25
0.4
Input Current @ Max
Input Voltage
VCC e Max, VI e 7V
VI e 10V
DM54
IIH
High Level Input Current
VCC e Max, VI e 2.7V
20.0
mA
IIL
Low Level Input Current
VCC e Max, VI e 0.4V
b 0.4
mA
IOS
Short Circuit
Output Current
VCC e Max
(Note 2)
Supply Current
VCC e Max
VOL
II
ICC
DM54
2.5
DM74
2.7
V
3.4
DM54
0.4
DM74
0.1
DM54
b 20
b 100
DM74
b 20
b 100
28
Note 1: All typicals are at VCC e 5V, TA e 25§ C.
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
2
V
mA
mA
mA
Switching Characteristics VCC e a 5.0V, TA e a 25§ C
Symbol
RL e 2 kX, CL e 15 pF
Parameter
Min
fmax
Maximum Clock Frequency
tPLH
tPHL
Propagation Delay
CP to Qn
30
MHz
25
25
Functional Description
Units
Max
ns
Truth Table
The ’LS377 consists of eight edge-triggered D flip-flops with
individual D inputs and Q outputs. The Clock (CP) and Enable 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.
Inputs
Output
E
CP
Dn
Qn
H
L
L
X
L
L
X
H
L
No Change
H
L
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Logic Symbol
TL/F/9831 – 2
VCC e Pin 20
GND e Pin 10
Logic Diagram
TL/F/9831 – 3
3
Physical Dimensions inches (millimeters)
Ceramic Leadless Chip Carrier (E)
Order Number DM54LS377E
NS Package Number E20A
20-Lead Ceramic Dual-In-Line Package (J)
Order Number DM54LS377J
NS Package Number J20A
4
Physical Dimensions inches (millimeters) (Continued)
20-Lead Wide Small Outline Molded Package (M)
Order Number DM74LS377WM
NS Package Number M20B
20-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS377N
NS Package Number N20A
5
DM54LS377/DM74LS377 Octal D Flip-Flop with Common Enable and Clock
Physical Dimensions inches (millimeters) (Continued)
20-Lead Ceramic Flat Package (W)
Order Number DM54LS377W
NS Package Number W20A
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and whose
failure to perform, when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
National Semiconductor
Corporation
1111 West Bardin Road
Arlington, TX 76017
Tel: 1(800) 272-9959
Fax: 1(800) 737-7018
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
National Semiconductor
Europe
Fax: (a49) 0-180-530 85 86
Email: cnjwge @ tevm2.nsc.com
Deutsch Tel: (a49) 0-180-530 85 85
English Tel: (a49) 0-180-532 78 32
Fran3ais Tel: (a49) 0-180-532 93 58
Italiano Tel: (a49) 0-180-534 16 80
National Semiconductor
Hong Kong Ltd.
13th Floor, Straight Block,
Ocean Centre, 5 Canton Rd.
Tsimshatsui, Kowloon
Hong Kong
Tel: (852) 2737-1600
Fax: (852) 2736-9960
National Semiconductor
Japan Ltd.
Tel: 81-043-299-2309
Fax: 81-043-299-2408
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.
Similar pages