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DM54123 Arkusz danych(PDF) 1 Page - National Semiconductor (TI) |
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DM54123 Arkusz danych(HTML) 1 Page - National Semiconductor (TI) |
1 / 6 page TLF6539 March 1993 DM54123DM74123 Dual Retriggerable One-Shot with Clear and Complementary Outputs General Description The ’123 is a dual retriggerable monostable multivibrator capable of generating output pulses from a few nano-sec- onds 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 A low at the clear (CLR) input terminates the output pulse which also inhibits triggering An internal connection from CLR to the input gate makes it possible to trigger the circuit by a positive-going signal on CLR as shown in the truth table To obtain the best and trouble free operation from this de- vice please read the operating rules as well as the NSC one – shot application notes carefully and observe recom- mendations Features Y DC triggered from active-high transition or active-low transition inputs Y Retriggerable to 100% duty cycle Y Direct reset terminates output pulse Y Compensated for VCC and temperature variations 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 transition clear input Retriggering 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 TLF6539 – 1 Order Number DM54123J-MIL DM54123W-MIL or DM74123N See NS Package Number J16A N16A or W16A Triggering Truth Table Inputs Response A B CLR X X L No Trigger K L X No Trigger K H H Trigger H L X No Trigger L L H Trigger LH L Trigger H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
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