54LS123
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.
- Overriding Clear Terminates Output Pulse
- pensated 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
SN54 / 74LS123 (TOP VIEW) (SEE NOTES 1 THRU 4)
V CC
1ĂR ext/ C ext
1 C ext
1Q 13
2Q 12
2 CLR
2B
2A 9
Q CLR Q
CLR Q
1A
1B
1 CLR
1Q
2Q
2 C ext
2 R ext/ C ext
SN54 / 74LS122 (TOP VIEW) (SEE NOTES 1 THRU 4)
R ext/
V CC
C ext
C...
