5-197
FAST AND LS TTL DATA
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.
• Overriding Clear Terminates Output Pulse
• Compensated for V
CC
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
SN54/74LS122 (TOP VIEW)
(SEE NOTES 1 THRU 4)
SN54/74LS123 (TOP VIEW)
(SEE NOTES 1 THRU 4)
NOTES:
1. An external timing capacitor may be connected between C
ext
and R
ext
/C
ext
(positive).
2. To use the internal timing resistor of the LS122, connect R
int
to V
CC
.
3. For improved pulse width accuracy connect an external resistor between R
ext
/C
ext
and
V
CC
with R
int
open-circuited.
4. To obtain variable pulse widths, connect an external variable resistance between R
int
/C
ext
and V
CC
.
C0049C0052 C0049C0051 C0049C0050 C0049C0049 C0049C0048 C0057
C0049 C0050 C0051 C0052 C0053 C0054
C0056
C0055
C0086
C0067C0067
C0082
C0101C0120C0116C0047
C0067
C0101C0120C0116
C0078C0067 C0067
C0101C0120C0116
C0078C0067 C0082
C0105C0110C0116
C0081
C0065C0049 C0065C0050 C0066C0049 C0066C0050 C0067C0076C0082 C0081 C0071C0078C0068
C0067C0076C0082
C0081
C0081
C0082
C0105C0110C0116
C0050
C0082
C0101C0120C0116C0047
C0067
C0101C0120C0116
C0049
C0067
C0101C0120C0116
C0049C0258C0082
C0101C0120C0116C0047
C0067
C0101C0120C0116
C0049C0052 C0049C0051 C0049C0050 C0049C0049 C0049C0048 C0057
C0049 C0050 C0051 C0052 C0053 C0054 C0055
C0049C0054 C0049C0053
C0056
C0086
C0067C0067
C0049C0065
C0049C0081 C0050C0081 C0050C0066
C0050
C0067C0076C0082
C0050C0065
C0049C0066 C0049
C0067C0076C0082
C0049C0081 C0050C0081 C0050
C0067
C0101C0120C0116
C0071C0078C0068
C0081
C0081
C0081
C0081
C0067C0076C0082
C0067C0076C0082
C0078C0067 C0266 C0078C0079 C0073C0078C0084C0069C0082C0078C0065C0076 C0067C0079C0078C0078C0069C0067C0084C0073C0079C0078C0046
SN54/74LS122
SN54/74LS123
RETRIGGERABLE MONOSTABLE
MULTIVIBRATORS
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16
1
16
1
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
16
1
D SUFFIX
SOIC
CASE 751B-03
J SUFFIX
CERAMIC
CASE 632-08
N SUFFIX
PLASTIC
CASE 646-06
14
1
14
1
14
1
D SUFFIX
SOIC
CASE 751A-02