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TL/F/9788
9314/DM9314 Quad Latch
June 1989
9314/DM9314 Quad Latch
General Description
The ’9314 is a multifunctional 4-bit latch designed for general purpose storage applications in high speed digital systems. All outputs have active pull-up circuitry to provide high
capacitance drive and to provide low impedance in both
logic states for good noise immunity.
Connection Diagram
Dual-In-Line Package
TL/F/9788– 1
Order Number 9314DMQB, 9314FMQB or DM9314N
See NS Package Number J16A, N16E or W16A
Logic Symbol
TL/F/9788– 2
V
CC
e
Pin 16
GND
e
Pin 8
Pin Names Description
E Enable Input (Active LOW)
D0–D3 Data Inputs
S
0–S3 Set Inputs (Active LOW)
MR
Master Reset Input (Active LOW)
Q0–Q3 Latch Outputs
C
1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.
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Absolute Maximum Ratings (Note)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Supply Voltage 7V
Input Voltage 5.5V
Operating Free Air Temperature Range
Military
b
55§Ctoa125§C
Commercial 0
§
Ctoa70§C
Storage Temperature Range
b
65§Ctoa150§C
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.
Recommended Operating Conditions
Symbol Parameter
Military Commercial
Units
Min Nom Max Min Nom Max
V
CC
Supply Voltage 4.5 5 5.5 4.75 5 5.25 V
V
IH
High Level Input Voltage 2 2 V
V
IL
Low Level Input Voltage 0.8 0.8 V
I
OH
High Level Output Current
b
0.8
b
0.8 mA
I
OL
Low Level Output Current 16 16 mA
T
A
Free Air Operating Temperature
b
55 125 0 70
§
C
ts(H) Setup Time HIGH or LOW 5.0 5.0
ns
t
s
(L) Dnto E 18 18
th(H) Hold Time HIGH or LOW 0 0
ns
th(L) Dnto E 5.0 5.0
ts(H) Setup Time HIGH, Dnto S
n
8.0 8.0 ns
th(L) Hold Time LOW, Dnto S
n
8.0 8.0 ns
tw(L) E Pulse Width LOW 18 18 ns
tw(L) MR Pulse Width LOW 18 18 ns
t
rec
Recovery Time, MR to E 00ns
Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min
Typ
Max Units
(Note 1)
V
I
Input Clamp Voltage V
CC
e
Min, I
I
eb
12 mA
b
1.5 V
V
OH
High Level Output Voltage V
CC
e
Min, I
OH
e
Max
2.4 3.4 V
V
IL
e
Max
V
OL
Low Level Output Voltage V
CC
e
Min, I
OL
e
Max
0.2 0.4 V
V
IH
e
Min
I
I
Input Current@Max V
CC
e
Min, V
I
e
5.5V
1mA
Input Voltage
I
IH
High Level Input Current V
CC
e
Max, V
I
e
2.4V 40
mA
Data Inputs 60
I
IL
Low Level Input Current V
CC
e
Max, V
I
e
0.4V
b
1.6
mA
Data Inputs
b
2.7
I
OS
Short Circuit V
CC
e
Max MIL
b
20
b
70
mA
Output Current (Note 2)
COM
b
20
b
70
I
CC
Supply Current V
CC
e
Max 55 mA
Note 1: All typicals are at V
CC
e
5V, T
A
e
25§C.
Note 2: Not more than one output should be shorted at a time.
2
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Switching Characteristics V
CC
ea
5.0V, T
A
ea
25§C (See Section 1 for waveforms and load configurations)
Symbol Parameter
C
L
e
15 pF
Units
Min Max
t
PLH
Propagation Delay 24
ns
t
PHL
E to Q
n
24
t
PLH
Propagation Delay 12
ns
t
PHL
Dnto Q
n
24
t
PLH
Propagation Delay
18 ns
MR to Q
n
t
PHL
Propagation Delay
24 ns
S
n
to Q
n
Functional Description
The ’9314 consists of four latches with a common active
LOW Enable input and active LOW Master Reset input.
When the Enable goes HIGH, data present in the latches is
stored and the state of the latch is no longer affected by the
S
n
and Dninputs. The Master Reset when activated overrides all other input conditions forcing all latch outputs LOW.
Each of the four latches can be operated in one of two
modes:
D-TYPE LATCHÐFor D-type operation the S
input of a latch
is held LOW. While the common Enable is active the latch
output follows the D input. Information present at the latch
output is stored in the latch when the Enable goes HIGH.
SET/RESET LATCHÐDuring set/reset operation when the
common Enable is LOW a latch is reset by a LOW on the D
input, and can be set by a LOW on the S
input if the D input
is HIGH. If both S
and D inputs are LOW, the D input will
dominate and the latch will be reset. When the Enable goes
HIGH, the latch remains in the last state prior to disablement. The two modes of latch operation are shown in the
Truth Table.
Truth Table
MR E DS QnOperation
H L L L L D Mode
HLHL H
HHXXQ
n
b
1
H L L L L R/S Mode
HLHL H
HLLH L
H LHHQ
nb1
HHXXQ
n
b
1
L X X X L Reset
HeHIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
Q
nb1
e
Previous Output State
Q
n
e
Present Output State
3
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Logic Diagram
TL/F/9788– 3
4
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Physical Dimensions inches (millimeters)
16-Lead Ceramic Dual-In-Line Package (J)
Order Number 9314DMQB
NS Package Number J16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM9314N
NS Package Number N16E
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9314/DM9314 Quad Latch
Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flat Package (W)
Order Number 9314FMQB
NS Package Number W16A
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failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.
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