DM54122 [NSC]
Retriggerable Resettable Multivibrator; 可重触发复位多谐振荡器
| 型号： | DM54122 |
| 厂家： | 
National Semiconductor |
| 描述： | Retriggerable Resettable Multivibrator |
| 文件： | 总6页 (文件大小：128K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
June 1989
54122/DM74122
Retriggerable Resettable Multivibrator
General Description
The ’122 features positive and negative DC level triggering
by a LOW signal applied to C , which also prevents trigger-
D
inputs, complementary outputs, an optional 10 kX internal
timing resistor and an overriding Direct Clear (C ) input.
D
ing. An internal connection from C to the input gate makes
D
it possible to trigger the circuit by a positive-going signal on
When the circuit is in the quasi-stable (delay) state, another
trigger applied to the inputs (per Truth Table) will cause the
delay period to start again, without disturbing the outputs.
This process can be repeated indefinitely and thus the out-
put pulse period (Q HIGH, Q LOW) can be made as long as
desired. Alternatively, a delay period can be terminated
C , as shown in the Truth Table. For timing capacitor values
D
greater than 1000 pF, the output pulse width is defined as
follows:
e
a
0.7/R )
t
w
0.32 R C (1.0
X
X
X
Where t is in ns, R is in kX and C is in pF.
w
X
X
Connection Diagram
Logic Symbol
Dual-In-Line Package
TL/F/10212–2
e
V
Pin 14
CC
GND
e
Pin 7
Pins 10 and 12
TL/F/10212–1
Order Number 54122DMQB, 54122FMQB or DM74122N
See NS Package Number J14A, N14A or W14B
e
NC
Pin Names
Description
A , A
1
Trigger Inputs (Active Falling Edge)
Trigger Inputs (Active Rising Edge)
Direct Clear Inputs (Active LOW)
Outputs
2
B , B
1
2
C
D
Q, Q
C
1995 National Semiconductor Corporation
TL/F/10212
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
54
DM74
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
54122
DM74122
Symbol
Parameter
Units
Min
4.5
2
Nom
Max
Min
4.75
2
Nom
Max
V
V
V
Supply Voltage
5
5.5
5
5.5
V
V
CC
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
IH
0.8
0.8
V
IL
b
0.8
16
b
I
I
0.8
16
70
mA
mA
OH
OL
b
b
55
T
A
55
125
C
§
e a
e a
25 C
Recommended Operating Conditions V
5.0V, T
§
CC
A
DM74
Symbol
Parameter
Conditions
Units
Min
Max
t
Trigger Pulse Width
40
5.0
5.0
ns
w
R
External Timing Resistor
XC
Over Operating V and
CC
50
25
X
kX
Temperature Range
XM
C
X
External Timing Capacitor
No Restrictions
pF
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Typ
Symbol
Parameter
Conditions
Min
Max
Units
V
(Note 1)
e
e
e b
e
b
1.5
V
V
Input Clamp Voltage
V
Min, I
Min, I
12 mA
Max,
I
CC
I
High Level Output Voltage
V
V
OH
CC
OH
2.4
V
e
Max
IL
e
e
e
Min
V
Low Level Output Voltage
V
Min, V
IH
0.4
V
OL
CC
CC
@
Input Current Max
e
I
V
Max, V
5.5V
I
I
1
mA
Input Voltage
e
e
e
e
I
High Level Input Current
V
Max, V
2.4V
0.4V
Inputs
Clear
Inputs
Clear
40
80
IH
IL
CC
CC
I
mA
b
I
Low Level Input Current
V
Max, V
1.6
3.2
I
mA
b
e
e
b
b
40
28
I
I
Short Circuit Output Current
Supply Current
V
V
Max (Note 2)
Max
10
mA
mA
OS
CC
CC
CC
e
e
25 C.
Note 1: All typicals are at V
5V, T
§
Note 2: Not more than one output should be shorted at a time, and the duration should not exceed one second.
CC
A
2
Switching Characteristics
5.0V, T
e a
e a
25 C (See Section 3 for waveforms and load configurations)
V
CC
§
A
54/74
e
e
C
15 pF
L
Symbol
Parameter
Conditions
Units
R
400X
L
Min
Max
t
t
t
t
t
t
t
t
Propagation Delay
B to Q
PLH
28
33
ns
ns
ns
ns
ns
ns
ns
ms
Propagation Delay
A to Q
PLH
e
Figure 3-1, Figure a
e
X
C
X
0 pF, R
5 kX
Propagation Delay
B to Q
PLH
36
Propagation Delay
A to Q
PHL
40
Propagation Delay
PLH
40
e
e
0 pF, R
X
C
D
to Q
C
X
5 kX
Figure 3-1, Figure 3-10
Propagation Delay
to Q
PHL
27
C
D
e
e
0 pF, R
X
Pulse Width at Q with Zero
Timing Capacitor
C
X
5 kX
w(out)
w(out)
65
Figure 3-1, Figure a
e
Figure 3-1, Figure a
e
10 kX
Pulse Width with External
Timing Components
C
X
1000 pF, R
X
3.08
3.76
Triggering Truth Table
Inputs*
Response
C
A
1
A
2
B
B
2
D
1
L
X
X
X
X
No Trigger
No Trigger
No Trigger
Trigger
X
X
H
K
K
K
L
X
H
X
L
X
X
H
H
X
X
H
X
H
L
X
H
X
X
L
L
L
H
L
X
H
H
No Trigger
No Trigger
Trigger
L
L
Trigger
e
e
e
H
L
HIGH Voltage Level
LOW Voltage Level
Immaterial
X
*Input pins 1 and 2 are logically interchangeable, as are input pins 3 and 4.
3
Pulse Width vs R and C
X
X
TL/F/10212–3
Timing Capacitor C –pF
X
TL/F/10212–4
FIGURE A
4
Physical Dimensions inches (millimeters)
14-Lead Ceramic Dual-In-Line Package (J)
Order Number 54122DMQB
NS Package Number J14A
14-Lead Molded Dual-In-Line Package (N)
Order Number DM74122N
NS Package Number N14A
5
Physical Dimensions inches (millimeters) (Continued)
14-Lead Ceramic Flat Package (W)
Order Number 54122FMQB
NS Package Number W14B
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