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54121DMQB Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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54121DMQB Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 6 page TLF6538 June 1989 54121DM54121DM74121 One-Shot with Clear and Complementary Outputs General Description The DM5474121 is a monostable multivibrator featuring both positive and negative edge triggering with complemen- tary outputs An internal 2kX timing resistor is provided for design convenience minimizing component count and lay- out problems This device can be used with a single external capacitor Inputs (A) are active-low trigger transition inputs and input (B) is an active-high transition Schmitt-trigger in- put that allows jitter-free triggering from inputs with tran- sition rates as slow as 1 voltsecond A high immunity to VCC noise of typically 15V is also provided by internal cir- cuitry at the input stage To obtain optimum and trouble free operation please read operating rules and NSC one-shot application notes careful- ly and observe recommendations Features Y Triggered from active-high transition or active-low tran- sition inputs Y Variable pulse width from 30 ns to 28 seconds Y Jitter free Schmitt-trigger input Y Excellent noise immunity typically 12V Y Stable pulse width up to 90% duty cycle Y TTL DTL compatible Y Compensated for VCC and temperature variations Y Input clamp diodes Y Alternate MilitaryAerospace device (54121) is avail- able Contact a National Semiconductor Sales Office Distributor for specifications Functional Description The basic output pulse width is determined by selection of an internal resistor RINT or an external resistor (RX) and capacitor (CX) Once triggered the output pulse width is in- dependent of further transitions of the inputs and is a func- tion of the timing components Pulse width can vary from a few nano-seconds to 28 seconds by choosing appropriate RX and CX combinations There are three trigger inputs from the device two negative edge-triggering (A) inputs one pos- itive edge Schmitt-triggering (B) input Connection Diagram Dual-In-Line Package TLF6538 – 1 Order Number 54121DMQB 54121FMQB DM54121J DM54121W or DM74121N See NS Package Number J14A N14A or W14B Function Table Inputs Outputs A1 A2 B Q Q LX H L H XL H L H XX L L H HH X L H H v H v HH vv H LX u XL u 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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