SN74LS122D [ONSEMI]
LOW POWER SCHOTTKY; 小功率肖特基
| 型号： | SN74LS122D |
| 厂家： | 
ONSEMI |
| 描述： | LOW POWER SCHOTTKY |
| 文件： | 总12页 (文件大小：175K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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.
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LOW POWER SCHOTTKY
• Overriding Clear Terminates Output Pulse
• 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
PLASTIC
N SUFFIX
CASE 646
GUARANTEED OPERATING RANGES
Symbol
Parameter
Supply Voltage
Min
4.75
0
Typ
5.0
25
Max
5.25
70
Unit
V
14
V
CC
1
SOIC
T
A
Operating Ambient
Temperature Range
°C
D SUFFIX
CASE 751A
I
Output Current – High
Output Current – Low
External Timing Resistance
External Capacitance
Wiring Capacitance at
–0.4
8.0
mA
mA
k
OH
I
OL
R
C
5.0
260
ext
ext
No Restriction
50
16
R
/C
pF
ext ext
1
R
/C Terminal
ext ext
PLASTIC
N SUFFIX
CASE 648
16
1
SOIC
D SUFFIX
CASE 751B
ORDERING INFORMATION
Device
Package
14 Pin DIP
14 Pin
Shipping
SN74LS122N
SN74LS122D
SN74LS123N
SN74LS123D
2000 Units/Box
2500/Tape & Reel
2000 Units/Box
2500/Tape & Reel
16 Pin DIP
16 Pin
Semiconductor Components Industries, LLC, 1999
1
Publication Order Number:
December, 1999 – Rev. 6
SN74LS122/D
SN74LS122 SN74LS123
SN74LS123 (TOP VIEW)
(SEE NOTES 1 THRU 4)
1 R
2
ext/
1
V
C
C
ext
1Q
13
2Q CLR 2B
2A
9
CC
ext
16
15
14
12
11
10
Q
Q
CLR
Q
Q
CLR
3
1
2
4
5
6
2
8
7
2
1A
1B
1
1Q
2Q
GND
R
ext/
CLR
C
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
ext ext
2. To use the internal timing resistor of the LS122, connect R to V
.
int
CC
3. For improved pulse width accuracy connect an external resistor between R /C and V with R open-circuited.
ext ext
CC
int
4. To obtain variable pulse widths, connect an external variable resistance between R /C and V
.
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
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
↑
H
H
H
H
H
H
H
H
H
H
H
H
X
L
↑
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
RC CC RC
ext
ext
ext
int
For values of C ≥ 1000 pF, the output pulse at V = 5.0
vary with V and temperature. Remember, the changes in
ext
CC
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 areconnected
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
designedintothesystemforoptimumperformancetoensure
that no false triggering occurs.
In order to trim the output pulse width, it is necessary to
includea variableresistorbetweenV 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
capacitanceapplicationandshouldnotbeusedontheLS122
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
IH
2.0
V
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
3.5
–1.5
V
V
V
V
= MIN, I = –18 mA
IN
IK
CC
2.7
= MIN, I = MAX, V = V
OH IN IH
CC
OH
or V per Truth Table
IL
V
V
= V MIN,
CC
0.25
0.35
0.4
0.5
V
V
I
I
= 4.0 mA
= 8.0 mA
CC
OL
= V or V
IH
V
Output LOW Voltage
Input HIGH Current
IN
IL
OL
per Truth Table
OL
20
0.1
µA
mA
mA
mA
V
V
V
V
= MAX, V = 2.7 V
IN
CC
CC
CC
CC
I
IH
= 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 1)
–20
= MAX
OS
LS122
LS123
I
Power Supply Current
mA
V
= MAX
CC
CC
20
Note 1: 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
= 0
ext
C = 15 pF
L
23
44
t
t
Propagation Delay, B to Q
Propagation Delay, B to Q
PLH
PHL
ns
ns
34
56
R
= 5.0 kΩ
ext
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
W
4.0
µs
AC SETUP REQUIREMENTS (T = 25°C, V = 5.0 V)
A
CC
Limits
Typ
Min
Max
Symbol
Parameter
Unit
Test Conditions
t
W
Pulse Width
40
ns
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5
SN74LS122 SN74LS123
V
V
CC
V
CC
RC
V
R
V
CC
V
CC
RC
R
ext
ext
0.1 µF
C
ext
0.1 µF
C
ext
C
R
C
/ V
CC
ext
ext
C
R
C
/
V
CC
ext
ext
CLR
ext
P
out
ext
Q
P
out
Q
B2
CLR
B
LS122
B1
1/2 LS123
A2
Q
Q
P
in
A1
P
in
A
GND
GND
51 Ω
51 Ω
Figure 1.
Figure 2.
P
P
in
t
W
out
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
= 1000 pF
ext
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
R
= 260 kΩ
= 160 kΩ
ext
ext
10000
1000
100
R
R
R
R
R
= 80 kΩ
= 40 kΩ
= 20 kΩ
= 10 kΩ
= 5 kΩ
ext
ext
ext
ext
ext
10
1
10
100
1000
C
, EXTERNAL TIMING CAPACITANCE (pF)
ext
Figure 8.
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7
SN74LS122 SN74LS123
0.65
C
= 200 pF
ext
–55°C
0°C
0.6
25°C
70°C
K
0.55
125°C
0.5
4.5
4.75
5
5.25
5.5
V
CC
VOLTS
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
0.770 18.16
MILLIMETERS
A
F
MIN
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
0.260
0.185
0.021
0.070
6.10
3.69
0.38
1.02
L
N
C
G
H
J
K
L
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
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.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
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.
14
1
8
7
–B–
P 7 PL
M
M
0.25 (0.010)
B
MILLIMETERS
DIM MIN MAX
INCHES
G
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
8.75 0.337
4.00 0.150
1.75 0.054
0.49 0.014
1.25 0.016
–T–
SEATING
PLANE
J
M
G
J
K
M
P
1.27 BSC
0.050 BSC
K
D 14 PL
0.19
0.10
0
0.25 0.008
0.25 0.004
0.009
0.009
7
M
S
S
0.25 (0.010)
T B
A
7
0
5.80
0.25
6.20 0.228
0.50 0.010
0.244
0.019
R
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10
SN74LS122 SN74LS123
PACKAGE DIMENSIONS
N SUFFIX
PLASTIC PACKAGE
CASE 648–08
ISSUE R
NOTES:
–A–
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
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
0.740 0.770 18.80 19.55
MILLIMETERS
MIN MAX
F
A
B
C
D
F
C
L
0.250 0.270
0.145 0.175
0.015 0.021
6.35
3.69
0.39
1.02
6.85
4.44
0.53
1.77
0.040
0.70
SEATING
–T–
G
H
J
K
L
M
S
0.100 BSC
0.050 BSC
0.008 0.015
2.54 BSC
1.27 BSC
PLANE
K
M
0.21
0.38
3.30
7.74
10
H
J
0.110
0.295 0.305
10
0.020 0.040
0.130
2.80
7.50
0
G
D 16 PL
0
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
0.25 (0.010)
B
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
DIM MIN MAX
INCHES
MIN
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
10.00 0.386
4.00 0.150
1.75 0.054
0.49 0.014
1.25 0.016
R X 45
K
C
G
J
K
M
P
1.27 BSC
0.050 BSC
–T–
SEATING
PLANE
0.19
0.10
0
0.25 0.008
0.25 0.004
0.009
0.009
7
J
M
D
16 PL
7
0
5.80
0.25
6.20 0.229
0.50 0.010
0.244
0.019
M
S
S
0.25 (0.010)
T B
A
R
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11
SN74LS122 SN74LS123
ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
withoutfurthernoticetoanyproductsherein. SCILLCmakesnowarranty,representationorguaranteeregardingthesuitabilityofitsproductsforanyparticular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability,
including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
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For additional information, please contact your local
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SN74LS122/D
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