SN74LS123DR2 [ROCHESTER]
Monostable Multivibrator, LS Series, 2-Func, TTL, PDSO16, PLASTIC, SOIC-16;
| 型号： | SN74LS123DR2 |
| 厂家： | 
Rochester Electronics |
| 描述： | Monostable Multivibrator, LS Series, 2-Func, TTL, PDSO16, PLASTIC, SOIC-16 时钟 输入元件 光电二极管 逻辑集成电路 |
| 文件： | 总12页 (文件大小：251K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN74LS122, SN74LS123
Retriggerable Monostable
Multivibrators
These dc triggered multivibrators feature pulse width control by
three methods. The basic pulse width is programmed by selection of
external resistance and capacitance values. The LS122 has an internal
timing resistor that allows the circuits to be used with only an external
capacitor. Once triggered, the basic pulse width may be extended by
retriggering the gated low-level-active (A) or high-level-active (B)
inputs, or be reduced by use of the overriding clear.
http://onsemi.com
LOW POWER SCHOTTKY
• Overriding Clear Terminates Output Pulse
PLASTIC
N SUFFIX
CASE 646
• Compensated for V and Temperature Variations
CC
• DC Triggered from Active-High or Active-Low Gated Logic Inputs
• Retriggerable for Very Long Output Pulses, up to 100% Duty Cycle
• Internal Timing Resistors on LS122
14
1
SOIC
D SUFFIX
CASE 751A
14
1
GUARANTEED OPERATING RANGES
PLASTIC
N SUFFIX
CASE 648
Symbol
Parameter
Supply Voltage
Min
4.75
0
Typ
5.0
25
Max
5.25
70
Unit
V
V
CC
16
T
A
Operating Ambient
Temperature Range
°C
1
SOIC
D SUFFIX
CASE 751B
I
Output Current − High
Output Current − Low
External Timing Resistance
External Capacitance
Wiring Capacitance at
−0.4
8.0
mA
mA
kW
OH
I
16
OL
1
R
5.0
260
ext
C
No Restriction
50
ext
SOEIAJ
M SUFFIX
CASE 966
R
/C
pF
ext ext
16
R /C Terminal
ext ext
1
ORDERING INFORMATION
Device
Package
14 Pin DIP
SOIC−14
SOIC−14
16 Pin DIP
SOIC−16
Shipping
2000 Units/Box
55 Units/Rail
SN74LS122N
SN74LS122D
SN74LS122DR2
SN74LS123N
SN74LS123D
SN74LS123DR2
SN74LS123M
SN74LS123MEL
2500/Tape & Reel
2000 Units/Box
38 Units/Rail
SOIC−16 2500/Tape & Reel
SOEIAJ−16
SOEIAJ−16
See Note 1
See Note 1
1. For ordering information on the EIAJ version of
the SOIC package, please contact your local
ON Semiconductor representative.
©
Semiconductor Components Industries, LLC, 2006
1
Publication Order Number:
June, 2006 − Rev. 8
SN74LS122/D
SN74LS122, SN74LS123
SN74LS123 (TOP VIEW)
(SEE NOTES 1 THRU 4)
1ꢀR
C
2
2Q CLR
ext/
1
V
C
ext
1Q
13
2B
10
2A
9
CC
ext
16
15
14
12
11
Q
Q
CLR
Q
Q
CLR
3
1
2
4
5
6
2
8
7
2
1A
1B
1
CLR
1Q
2Q
GND
R
C
ext
ext/
C
ext
SN74LS122 (TOP VIEW)
(SEE NOTES 1 THRU 4)
R
ext/
V
NC
12
C
NC
10
R
int
Q
8
C
CC
ext
ext
14
13
11
9
R
int
Q
Q
CLR
5
1
2
3
4
6
7
A1
A2
B1
B2 CLR
Q
GND
NC ꢁ NO INTERNAL CONNECTION.
NOTES:
1. An external timing capacitor may be connected between C and R /C (positive).
ext
2. To use the internal timing resistor of the LS122, connect R to V
ext ext
.
int
CC
3. For improved pulse width accuracy connect an external resistor between R /C and V with R open-circuited.
ext ext CC
4. To obtain variable pulse widths, connect an external variable resistance between R /C and V
int
.
int ext
CC
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2
SN74LS122, SN74LS123
LS122 FUNCTIONAL TABLE
INPUTS
LS123 FUNCTIONAL TABLE
OUTPUTS
INPUTS
A
OUTPUTS
CLEAR
A1
A2
B1
B2
Q
Q
CLEAR
B
Q
Q
L
X
X
X
H
H
H
H
H
H
H
↑
X
H
X
X
L
X
H
X
X
X
X
L
X
X
L
X
↑
X
X
X
L
H
↑
L
L
L
L
H
H
H
H
L
X
X
H
H
↑
X
H
X
L
↓
L
X
X
L
↑
H
H
L
L
L
H
H
H
L
H
↑
X
X
H
↓
↓
L
H
↑
L
H
H
H
H
H
H
↓
↓
H
X
L
H
H
H
H
H
↑
X
TYPICAL APPLICATION DATA
The output pulse t is a function of the external
Figures 5 and 6 show the behavior of the circuit shown in
Figures 1 and 2 if separate power supplies are used for V
W
CC
components, C and R or C and R on the LS122.
and V . If V is tied to V , Figure 7 shows how K will
ext
ext
ext
int
RC CC RC
For values of C ≥ 1000 pF, the output pulse at V = 5.0
vary with V and temperature. Remember, the changes in
CC
ext
CC
V and V = 5.0 V (see Figures 1, 2, and 3) is given by
R and C with temperature are not calculated and
ext ext
RC
included in the graph.
As long as C ≥ 1000 pF and 5K ≤ R ≤ 260K, the
t
= K R
C
where K is nominally 0.45
W
ext ext
ext
ext
If C is on pF and R is in kΩ then t is in nanoseconds.
ext
ext
W
change in K with respect to R is negligible.
ext
The C terminal of the LS122 and LS123 is an internal
ext
If C ≤ 1000 pF the graph shown on Figure 8 can be used
ext
connection to ground, however for the best system
performance C should be hard-wired to ground.
Care should be taken to keep R and C as close to the
monostable as possible with a minimum amount of
inductance between the R /C junction and the R /C
pin. Good groundplane and adequate bypassing should be
to determine the output pulse width. Figure 9 shows how K
ext
will change for C ≤ 1000 pF if V and V are connected
ext
CC
RC
ext
ext
to the same power supply. The pulse width t in
W
nanoseconds is approximated by
ext ext
ext ext
t
W
= 6 + 0.05 C (pF) + 0.45 R (kΩ) C + 11.6 R
ext ext ext ext
designed into the system for optimum performance to ensure
that no false triggering occurs.
In order to trim the output pulse width, it is necessary to
include a variable resistor between V and the R /C pin
CC
ext ext
It should be noted that the C pin is internally connected
or between V and the R pin of the LS122. Figure 10, 11,
ext
CC ext
to ground on the LS122 and LS123, but not on the LS221.
and 12 show how this can be done. R remote should be
ext
Therefore, if C
is hard-wired externally to ground,
kept as close to the monostable as possible.
ext
substitution of a LS221 onto a LS123 socket will cause the
LS221 to become non-functional.
Retriggering of the part, as shown in Figure 3, must not
occur before C is discharged or the retrigger pulse will not
ext
The switching diode is not needed for electrolytic
capacitance application and should not be used on the LS122
and LS123.
have any effect. The discharge time of C in nanoseconds
ext
is guaranteed to be less than 0.22 C (pF) and is typically
ext
0.05 C (pF).
ext
To find the value of K for C ≥ 1000 pF, refer to Figure 4.
For the smallest possible deviation in output pulse widths
ext
Variations on V or V can cause the value of K to
from various devices, it is suggested that C be kept
CC
RC
ext
change, as can the temperature of the LS123, LS122.
≥ 1000 pF.
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3
SN74LS122, SN74LS123
WAVEFORMS
RETRIGGER
(See Application Data)
PULSE
B INPUT
Q OUTPUT
t
W
OUTPUT WITHOUT RETRIGGER
EXTENDING PULSE WIDTH
B INPUT
CLEAR PULSE
CLEAR INPUT
OUTPUT WITHOUT CLEAR PULSE
Q OUTPUT
OVERRIDING THE OUTPUT PULSE
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4
SN74LS122, SN74LS123
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Min
Typ
Max
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
V
2.0
V
IH
0.8
Guaranteed Input LOW Voltage for
All Inputs
V
V
V
Input LOW Voltage
V
IL
Input Clamp Diode Voltage
Output HIGH Voltage
−0.65
−1.5
V
V
V
V
= MIN, I = −18 mA
IN
IK
CC
2.7
3.5
= MIN, I = MAX, V = V
OH IN
CC
IH
OH
or V per Truth Table
IL
V
V
= V MIN,
0.25
0.35
0.4
V
I
I
= 4.0 mA
= 8.0 mA
CC
CC
OL
OL
V
Output LOW Voltage
Input HIGH Current
= V or V
OL
IN
IL
IH
0.5
20
V
per Truth Table
μA
mA
mA
mA
V
V
V
V
= MAX, V = 2.7 V
IN
CC
CC
CC
CC
I
IH
0.1
= MAX, V = 7.0 V
IN
I
I
Input LOW Current
−0.4
−100
11
= MAX, V = 0.4 V
IL
IN
Short Circuit Current (Note 2)
−20
= MAX
OS
LS122
LS123
I
Power Supply Current
mA
V
= MAX
CC
CC
20
2. Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (T = 25°C, V = 5.0 V)
A
CC
Limits
Typ
23
Min
Max
33
Symbol
Parameter
Unit
Test Conditions
t
t
Propagation Delay, A to Q
Propagation Delay, A to Q
PLH
PHL
ns
32
45
C
ext
= 0
C = 15 pF
23
44
L
t
t
Propagation Delay, B to Q
Propagation Delay, B to Q
PLH
PHL
ns
ns
34
56
R
ext
= 5.0 kΩ
R = 2.0 kΩ
L
28
45
t
t
Propagation Delay, Clear to Q
Propagation Delay, Clear to Q
PLH
PHL
20
27
t
A or B to Q
A to B to Q
116
4.5
200
5.0
ns
W min
C
= 1000 pF, R = 10 kΩ,
ext
ext
C = 15 pF, R = 2.0 kΩ
L
L
t Q
4.0
μs
W
AC SETUP REQUIREMENTS (T = 25°C, V = 5.0 V)
A
CC
Limits
Typ
Min
Max
Symbol
Parameter
Unit
Test Conditions
t
Pulse Width
40
ns
W
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5
SN74LS122, SN74LS123
V
V
V
CC
RC
CC
V
R
V
V
RC
CC
CC
R
ext
ext
0.1 μF
C
ext
0.1 μF
C
ext
R
C
C
R
C
/ V
CC
ext
ext
C
/
V
CC
ext
ext
CLR
ext
ext
P
Q
P
Q
out
out
B2
B1
A2
A1
CLR
B
LS122
1/2 LS123
Q
Q
P
in
P
A
in
GND
GND
51 Ω
51 Ω
Figure 1.
Figure 2.
P
P
in
t
out
W
RETRIGGER
Figure 3.
10
5K ≤ R ≤ 260K
ext
1
0.1
0.01
0.001
0.3 0.35 0.4
0.45 0.5 0.55
K
Figure 4.
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6
SN74LS122, SN74LS123
0.55
0.55
0.55
V
C
= 5 V
= 1000 pF
CC
V
C
= 5 V
= 1000 pF
RC
C
ext
= 1000 pF
ext
ext
0.5
0.5
K
0.5
K
−55°C
−55°C
0°C
0°C
−55°C
0°C
K
25°C
0.45
0.45
0.45
25°C
70°C
70°C
25°C
70°C
125°C
125°C
0.4
0.4
0.4
125°C
0.35
0.35
0.35
4.5
5
CC
5.5
4.5
5
RC
5.5
4.5
5
5.5
V
V
V
V
CC = RC
Figure 5. K versus VCC
Figure 6. K versus VRC
Figure 7. K versus VCC and VRC
100000
R
ext
R
ext
= 260 kΩ
= 160 kΩ
10000
1000
100
10
R
ext
R
ext
R
ext
R
ext
R
ext
= 80 kΩ
= 40 kΩ
= 20 kΩ
= 10 kΩ
= 5 kΩ
1
10
100
1000
C , EXTERNAL TIMING CAPACITANCE (pF)
ext
Figure 8.
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7
SN74LS122, SN74LS123
0.65
0.6
C
ext
= 200 pF
−55°C
0°C
25°C
70°C
K
0.55
0.5
125°C
4.5
4.75
5
5.25
5.5
V
VOLTS
CC
Figure 9.
V
CC
R
ext
REMOTE
R
ext
PIN 7
OR 15
C
ext
PIN 6
OR 14
Figure 10. LS123 Remote Trimming Circuit
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8
SN74LS122, SN74LS123
V
CC
PIN 9
OPEN
R
ext
REMOTE
R
ext
PIN 13
C
ext
PIN 11
Figure 11. LS122 Remote Trimming Circuit Without Rext
V
CC
R
ext
REMOTE
PIN 9
PIN 13
PIN 11
Figure 12. LS122 Remote Trimming Circuit with Rint
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9
SN74LS122, SN74LS123
PACKAGE DIMENSIONS
N SUFFIX
PLASTIC PACKAGE
CASE 646−06
ISSUE M
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
14
1
8
7
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
B
INCHES
DIM MIN MAX
MILLIMETERS
A
F
MIN
18.16
6.10
3.69
0.38
1.02
MAX
18.80
6.60
4.69
0.53
1.78
A
B
C
D
F
0.715
0.240
0.145
0.015
0.040
0.770
0.260
0.185
0.021
0.070
L
N
C
G
H
J
0.100 BSC
2.54 BSC
0.052
0.008
0.115
0.290
−−−
0.095
0.015
0.135
0.310
10
1.32
0.20
2.92
7.37
−−−
2.41
0.38
3.43
7.87
10
−T−
SEATING
PLANE
K
L
J
K
M
N
_
_
0.015
0.039
0.38
1.01
D 14 PL
H
G
M
M
0.13 (0.005)
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751A−03
ISSUE F
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
−A−
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
14
8
7
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
−B−
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
P 7 PL
M
M
B
0.25 (0.010)
1
MILLIMETERS
INCHES
G
DIM MIN
MAX
8.75
4.00
1.75
0.49
1.25
MIN
MAX
0.344
0.157
0.068
0.019
0.049
F
R X 45
_
C
A
B
C
D
F
8.55
3.80
1.35
0.35
0.40
0.337
0.150
0.054
0.014
0.016
−T−
SEATING
PLANE
J
M
G
J
1.27 BSC
0.050 BSC
K
D 14 PL
0.19
0.10
0
0.25
0.25
7
0.008
0.004
0
0.009
0.009
7
M
S
S
0.25 (0.010)
T B
A
K
M
P
R
_
_
_
_
5.80
0.25
6.20
0.50
0.228
0.010
0.244
0.019
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10
SN74LS122, SN74LS123
PACKAGE DIMENSIONS
N SUFFIX
PLASTIC PACKAGE
CASE 648−08
ISSUE R
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
−A−
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
16
1
9
8
B
S
INCHES
DIM MIN MAX
MILLIMETERS
MIN
18.80
6.35
3.69
0.39
1.02
MAX
19.55
6.85
4.44
0.53
1.77
F
A
B
C
D
F
0.740
0.250
0.145
0.015
0.040
0.770
0.270
0.175
0.021
0.70
C
L
SEATING
PLANE
−T−
G
H
J
0.100 BSC
0.050 BSC
2.54 BSC
1.27 BSC
K
M
0.008
0.015
0.130
0.305
10
0.21
0.38
3.30
7.74
10
H
J
K
L
0.110
0.295
0
2.80
7.50
0
G
D 16 PL
M
S
_
_
_
_
0.020
0.040
0.51
1.01
M
M
0.25 (0.010)
T A
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751B−05
ISSUE J
−A−
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
16
9
−B−
P 8 PL
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
M
S
B
0.25 (0.010)
1
8
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
G
MILLIMETERS
INCHES
MIN
DIM MIN
MAX
10.00
4.00
1.75
0.49
1.25
MAX
0.393
0.157
0.068
0.019
0.049
F
A
B
C
D
F
9.80
3.80
1.35
0.35
0.40
0.386
0.150
0.054
0.014
0.016
R X 45
K
_
C
G
J
1.27 BSC
0.050 BSC
−T−
SEATING
PLANE
0.19
0.10
0
0.25
0.25
7
0.008
0.004
0
0.009
0.009
7
J
M
K
M
P
R
D
16 PL
_
_
_
_
5.80
0.25
6.20
0.50
0.229
0.010
0.244
0.019
M
S
S
A
0.25 (0.010)
T B
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11
SN74LS122, SN74LS123
PACKAGE DIMENSIONS
M SUFFIX
SOEIAJ PACKAGE
CASE 966−01
ISSUE O
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS D AND E DO NOT INCLUDE MOLD
FLASH OR PROTRUSIONS AND ARE MEASURED
AT THE PARTING LINE. MOLD FLASH OR
PROTRUSIONS SHALL NOT EXCEED 0.15 (0.006)
PER SIDE.
L
16
9
E
Q
1
H
E
E
M
_
4. TERMINAL NUMBERS ARE SHOWN FOR
REFERENCE ONLY.
5. THE LEAD WIDTH DIMENSION (b) DOES NOT
INCLUDE DAMBAR PROTRUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.08 (0.003)
TOTAL IN EXCESS OF THE LEAD WIDTH
DIMENSION AT MAXIMUM MATERIAL CONDITION.
DAMBAR CANNOT BE LOCATED ON THE LOWER
RADIUS OR THE FOOT. MINIMUM SPACE
BETWEEN PROTRUSIONS AND ADJACENT LEAD
TO BE 0.46 ( 0.018).
1
8
L
DETAIL P
Z
D
VIEW P
e
MILLIMETERS
INCHES
MIN MAX
−−− 0.081
A
DIM MIN
MAX
2.05
0.20
0.50
0.27
10.50
5.45
c
A
−−−
0.05
0.35
0.18
9.90
5.10
A
1
0.002
0.008
0.020
0.011
0.413
0.215
b
c
0.014
0.007
0.390
0.201
D
E
A
1
b
0.13 (0.005)
e
1.27 BSC
0.050 BSC
0.10 (0.004)
M
H
7.40
0.50
1.10
8.20
0.85
1.50
0.291
0.020
0.043
0.323
0.033
0.059
E
L
L
E
0
0.70
−−−
10
10
0.035
−−− 0.031
M
Q
0
0.028
_
_
_
_
0.90
0.78
1
Z
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SN74LS122/D
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SN74LS123DRE4
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SN74LS123DRG4
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