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74LS12 Datasheet

  • 74LS12

  • RETRIGGERABLE MONOSTABLE MULTIVIBRATORS

  • 10頁

  • MOTOROLA   MOTOROLA

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SN54/74LS122
SN54/74LS123
RETRIGGERABLE MONOSTABLE
MULTIVIBRATORS
These dc triggered multivibrators feature pulse width control by three meth-
ods. 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 ba-
sic 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.
RETRIGGERABLE MONOSTABLE
MULTIVIBRATORS
LOW POWER SCHOTTKY
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Overriding Clear Terminates Output Pulse
Compensated for VCC and Temperature Variations
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
16
1
J SUFFIX
CERAMIC
CASE 620-09
SN54 / 74LS123
(TOP VIEW)
(SEE NOTES 1 THRU 4)
1 R
ext/
V
CC
16
C
ext
15
1
C
ext
14
1Q
13
2Q
12
2
CLR
2B
10
2A
9
16
1
N SUFFIX
PLASTIC
CASE 648-08
11
Q
CLR
Q
CLR
Q
Q
16
1
6
2
7
2
R
ext/
C
ext
8
GND
D SUFFIX
SOIC
CASE 751B-03
1
1A
2
1B
3
1
CLR
4
1Q
5
2Q
C
ext
J SUFFIX
CERAMIC
CASE 632-08
14
1
SN54 / 74LS122
(TOP VIEW)
(SEE NOTES 1 THRU 4)
R
ext/
V
CC
14
C
ext
13
NC
12
C
ext
11
NC
10
R
int
9
Q
8
R
int
Q
14
1
N SUFFIX
PLASTIC
CASE 646-06
CLR
Q
1
A1
2
A2
3
B1
4
B2
5
CLR
6
Q
7
GND
14
1
D SUFFIX
SOIC
CASE 751A-02
NC
NO INTERNAL CONNECTION.
NOTES:
1. An external timing capacitor may be connected between Cext and Rext/Cext (positive).
2. To use the internal timing resistor of the LS122, connect Rint to VCC.
3. For improved pulse width accuracy connect an external resistor between Rext/Cext and
VCC with Rint open-circuited.
4. To obtain variable pulse widths, connect an external variable resistance between Rint/Cext
and VCC.
ORDERING INFORMATION
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
FAST AND LS TTL DATA
5-197

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