9321 [NSC]
DUAL 1-OF-4 DECODER; 双1 -OF -4解码器
| 型号： | 9321 |
| 厂家： | 
National Semiconductor |
| 描述： | DUAL 1-OF-4 DECODER |
| 文件： | 总6页 (文件大小：127K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
June 1989
9321/DM9321
Dual 1-of-4 Decoder
General Description
Features
Y
Multifunction capability
The 9321 consists of two independent multipurpose decod-
ers, each designed to accept two inputs and provide four
mutually exclusive outputs. In addition an active LOW en-
able input, which gives demultiplexing capability, is provided
for each decoder.
Y
Mutually exclusive outputs
Y
Demultiplexing capability
Y
Active low enable for each decoder
Connection Diagram
Logic Symbol
Dual-In-Line Package
TL/F/10209–2
e
e
V
Pin 16
CC
GND
Pin 8
TL/F/10209–1
Order Number 9321DMQB, 9321FMQB or DM9321N
See NS Package Number J16A, N16E or W16A
Pin Names
Description
Ea, Eb
Enable Inputs (Active LOW)
Address Inputs
A0a, A1a, A0b, A1b
O0a–O3a
Decoder Outputs (Active LOW)
O0b–O3b
(
C
1995 National Semiconductor Corporation
TL/F/10209
RRD-B30M105/Printed in U. S. A.
Absolute Maximum Ratings (Note)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Note: The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed. 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.
Supply Voltage
Input Voltage
7V
5.5V
Operating Free Air Temperature Range
MIL
COMM
b
b
a
55 C to 125 C
§
0 C to 70 C
§
a
§
§
a
65 C to 150 C
Storage Temperature Range
§
§
Recommended Operating Conditions
Military
Commercial
Units
Symbol
Parameter
Min
Nom
Max
Min
Nom
Max
V
V
Supply Voltage
4.5
5
5.5
4.75
5
5.25
V
V
CC
High Level Input
Voltage
IH
2
2
V
Low Level Input
Voltage
IL
OH
OL
0.8
0.8
V
I
I
High Level Output
Current
b
b
0.8
0.8
mA
mA
Low Level Output
Current
16
16
T
A
Free Air Operating
Temperature
b
55
125
0
70
C
§
Electrical Characteristics over recommended operating free air temperature (unless otherwise noted)
Typ
Symbol
Parameter
Conditions
Min
Max
Units
(Note 1)
e
e
e b
e
b
1.5
V
V
Input Clamp Voltage
V
Min, I
Min, I
10 mA
V
V
I
CC
I
High Level Output
Voltage
V
V
Max,
Min
OH
CC
OH
2.4
e
e
Max, V
IL
IH
e
e
V
OL
Low Level Output
Voltage
V
V
Min, I
Max,
CC
OL
0.4
V
e
e
Min, V
Max
IH
IL
@
Input Current Max
e
e
e
e
I
I
I
I
V
V
V
V
Max, V
Max, V
Max, V
Max
5.5V
I
CC
CC
CC
CC
I
I
I
1
mA
mA
mA
Input Voltage
e
e
e
High Level Input
Current
2.4V
0.4V
IH
IL
40
Low Level Input
Current
b
1.6
b
b
70
Short Circuit
MIL
20
OS
mA
mA
Output Current
(Note 2)
b
b
3.7
COM
1.3
e
CC
I
Supply Current
V
Max (Note 3)
50
CC
e
e
25 C.
Note 1: All typicals are at V
5V, T
§
CC
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 3: I is measured with all outputs open and all inputs grounded.
A
CC
2
e a
e a
25 C (See Section 1 for test waveforms and output load)
Switching Characteristics V
5.0V, T
§
CC
A
e
C
L
15 pF
Symbol
Parameter
Units
Min
Max
t
t
Propagation Delay, An to On
Propagation Delay, E to On
20
21
PLH
ns
ns
PHL
t
t
14
18
PLH
PHL
Functional Description
Truth Table (Each Decoder)
The 9321 consists of two separate decoders each designed
to accept two binary weighted inputs and provide four mutu-
ally exclusive active LOW outputs as shown in the logic
symbol. Each decoder can be used as a 4-output demulti-
plexer by using the enable as a data input.
Inputs
Outputs
E
A0
A1
O0
O1
O2
O3
L
L
L
L
H
L
H
L
L
L
L
H
H
H
H
H
L
H
H
L
H
H
H
L
H
H
X
H
H
H
H
X
H
H
H
e
e
e
H
L
HIGH Voltage Level
LOW Voltage Level
Immaterial
X
Logic Diagram
TL/F/10209–3
3
4
Physical Dimensions inches (millimeters)
16-Lead Ceramic Dual-In-Line Package (J)
Order Number 9321DMQB
NS Package Number J16A
16 Lead Molded Dual-In-Line Package (N)
Order Number DM9321N
NS Package Number N16E
5
Physical Dimensions inches (millimeters) (Continued)
16-Lead Ceramic Flat Package (W)
Order Number 9321FMQB
NS Package Number W16A
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to the user.
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
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