Monostable Multivibrator With Schmitt-trigger Inputs

These multivibrators feature dual negative-transition-triggered inputs and a single positive-transition-triggered input which CAN be used as an inhibit input. Complementary output pulses are provided.
Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input pulse. Schmitt-trigger input circuitry (TTL hysteresis) for the B input allow jitter-free triggering from inputs with e2a transition rates as slow as 1 volt/second, providing the circuit with an excellent noise immunity of typically 1.2 volts. A high immunity to VCC noise of typically 1.5 volts is also provided by internal latching circuitry.
Once fired, the outputs are independent of further transitions of the inputs and are a function only of the Timing components. Input pulses may be of any duration relative to the output puls. Output pulse length may be varied from 40 nanoseconds to 28 seconds by choosing appropriate Timing components. With no external Timing components (i.e., Rint connected to VCC, Cext and Rext/Cext open), an output pulse of typically 30 or 35 nanoseconds is achieved which may be used as a d-c triggered reset signal. Output rise and fall times are TTL compatible and independent of pulse length.
Pulse width stability is achieved through internal compensation and is virtually independent of VCC and temperature. In most application, pulse stability will only be limited by the accuracy of external Timing components.
Jitter-free operation is maintained over the full temperature and VCC ranges for more than six decades of Timing capacitance (10 pF to 10 F) and more than one decade of Timing resistance (2 k to 30 k for the SN54121 and 2 k to 40 k for the SN74121 . Throughout these ranges, pulse width is defined by the relationship tw(out) = CextRTin2 = 0.7 CextRT. In circuits where pulse cutoff is not critical, Timing capacitance up to 1000 F and Timing resistance as low as 1.4 k may be used. Also, the range of jitter-free output pulse widths is extended if VCC is held to 5 volts and free-air temperature is 25C. Duty cycles as high as 90% are achieved when using maximum recommended RT. Higher duty cycles are available if a certain amount of pulse-width jitter is allowed.
By Texas Instruments
Part Manufacturer Description Datasheet Samples
SN74121J-00 Texas Instruments TTL/H/L SERIES, MONOSTABLE MULTIVIBRATOR, CDIP14
SN74121DG4 Texas Instruments 74121 SERIES, MONOSTABLE MULTIVIBRATOR, PDSO14, GREEN, PLASTIC, SOIC-14
SN74121N Texas Instruments Monostable multivibrator with Schmitt-trigger inputs 14-PDIP 0 to 70
SN74121DRG4 Texas Instruments 74121 SERIES, MONOSTABLE MULTIVIBRATOR, PDSO14, GREEN, PLASTIC, SOIC-14
SN74121DRE4 Texas Instruments 74121 SERIES, MONOSTABLE MULTIVIBRATOR, PDSO14, GREEN, PLASTIC, SOIC-14
SN74121DR Texas Instruments Monostable multivibrator with Schmitt-trigger inputs 14-SOIC 0 to 70
SN74121NSR Texas Instruments 74121 SERIES, MONOSTABLE MULTIVIBRATOR, PDSO14, GREEN, PLASTIC, SOP-14
SN74121D Texas Instruments Monostable multivibrator with Schmitt-trigger inputs 14-SOIC 0 to 70
SN74121NSRE4 Texas Instruments 74121 SERIES, MONOSTABLE MULTIVIBRATOR, PDSO14, GREEN, PLASTIC, SOP-14
SN74121DE4 Texas Instruments Monostable multivibrator with Schmitt-trigger inputs 14-SOIC 0 to 70
SN74121 's PackagesSN74121 's pdf datasheet
SN74121D SOIC
SN74121DE4 SOIC
SN74121DG4 SOIC
SN74121DR SOIC
SN74121DRE4 SOIC
SN74121DRG4 SOIC
SN74121N PDIP
SN74121N3 PDIP
SN74121NE4 PDIP
SN74121NSR SO
SN74121NSRE4 SO
SN74121NSRG4 SO




SN74121 Pinout, Pinouts
SN74121 pinout,Pin out
This is one package pinout of SN74121,If you need more pinouts please download SN74121's pdf datasheet.

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