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DM74LS123 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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DM74LS123 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 6 page TLF6386 March 1991 DM74LS123 Dual Retriggerable One-Shot with Clear and Complementary Outputs General Description The DM74LS123 is a dual retriggerable monostable multivi- brator capable of generating output pulses from a few nano- seconds to extremely long duration up to 100% duty cycle Each device has three inputs permitting the choice of either leading edge or trailing edge triggering Pin (A) is an active- low transition trigger input and pin (B) is an active-high tran- sition trigger input The clear (CLR) input terminates the out- put pulse at a predetermined time independent of the timing components The clear input also serves as a trigger input when it is pulsed with a low level pulse transition ( ) To obtain the best trouble free operation from this device please read the operating rules as well as the NSC one-shot application notes carefully and observe recommendations Features Y DC triggered from active-high transition or active-low transition inputs Y Retriggerable to 100% duty cycle Y Compensated for VCC and temperature variations Y Triggerable from CLEAR input Y DTL TTL compatible Y Input clamp diodes Functional Description The basic output pulse width is determined by selection of an external resistor (RX) and capacitor (CX) Once triggered the basic pulse width may be extended by retriggering the gated active-low transition or active-high transition inputs or be reduced by use of the active-low or CLEAR input Retrig- gering to 100% duty cycle is possible by application of an input pulse train whose cycle time is shorter than the output cycle time such that a continuous ‘‘HIGH’’ logic state is maintained at the ‘‘Q’’ output Connection Diagram Dual-In-Line Package TLF6386 – 1 Order Number DM74LS123M or DM74LS123N See NS Package Number M16A or N16E Function Table Inputs Outputs CLEAR A B Q Q LX X L H XH X L H XX L L H HL u H v H u LH H e High Logic Level L e Low Logic Level X e Can Be Either Low or High u e Positive Going Transition v e Negative Going Transition e A Positive Pulse e A Negative Pulse C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
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