Part # 74LS123 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: DM74LS123 Dual Retriggerable One-Shot with Clear and Complementary Outputs

Part Details:

with DM74LS123 March 1991 Clear DM74LS123 Dual Retriggerable One-Shot and Dual with Clear and Complementary Outputs Complementary General Description Y Compensated for VCC and temperature variations Y Triggerable from CLEAR input Retriggerable The DM74LS123 is a dual retriggerable monostable multivi- Y DTL TTL compatible brator capable of generating output pulses from a few nano- Y seconds to extremely long duration up to 100% duty cycle Input clamp diodes Each device has three inputs permitting the choice of eitherleading edge or trailing edge triggering Pin (A) is an active- Functional Description low transition trigger input and pin (B) is an active-high tran- The basic output pulse width is determined by selection of sition trigger input The clear (CLR) input terminates the out- an external resistor (RX) and capacitor (CX) Once triggered put pulse at a predetermined time independent of the timing the basic pulse width may be extended by retriggering the components The clear input also serves as a trigger input gated active-low transition or active-high transition inputs or when it is pulsed with a low level pulse transition ( ) To be reduced by use of the active-low or CLEAR input Retrig- Outputs One-Shot obtain the best trouble free operation from this device gering to 100% duty cycle is possible by application of an please read the operating rules as well as the NSC one-shot input pulse train whose cycle time is shorter than the output application notes carefully and observe recommendations cycle time such that a continuous ``HIGH logic state ismaintained at the ``Q output FeaturesY DC triggered from active-high transition or active-lowtransition inputs Y Retriggerable to 100% duty cycle Connection Diagram Function Table Dual-In-Line Package Inputs Outputs CLEAR A B

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74LS123.pdf Datasheet