DM54123 Datasheet | National Semiconductor

Description The ’123 is a dual retriggerable monostable multivibrator 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 activelow transition trigger input and pin (B) is an active-high transition 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 device please read the operating rules as well as the NSC one - shot application notes carefully and observe remendations Features Y Y Y Y Y Y DC triggered from active-high transition or active-low transition inputs Retriggerable to 100% duty cycle Direct reset terminates output pulse pensated for VCC and temperature variations DTL TTL patible 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 Triggering Truth Table Inputs A X K K H L L B X L H L L H CLR L X H X H L No Trigger No Trigger Trigger No Trigger Trigger Trigger Response H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial TL F 6539 - 1 Order Number DM54123J-MIL DM54123W-MIL or DM74123N See NS Package Number J16A N16A or W16A C1995 National Semiconductor Corporation TL F...