M38510/31402BFA

M38510/31402BFA

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M38510/31402BFA
DUAL MONOSTABLE MULTIVIBRATORS W
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M38510/31402BFA description/ordering information

’221 andThe’LS221 devices are dualmultivibrators with performance characteristicsvirtually identical to those of the ’121 devices.Each multivibrator features a negative-transition-triggered input and a positive-transition-triggeredinput, either of which can be used as an inhibitinput.

M38510/31402BFA description/ordering information (continued)

Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the inputpulse. Schmitt-trigger input circuitry (TTL hysteresis) for B input allows jitter-free triggering from inputs withtransition at rates as slow as 1 V/s, providing the circuit with excellent noise immunity, typically of 1.2 V. A highimmunity to VCC noise, typically of 1.5 V, also is provided by internal latching circuitry.Once fired, the outputs are independent of further transitions of the A and B inputs and are a function of the timingcomponents, or the output pulses can be terminated by the overriding clear. Input pulses can be of any durationrelative to the output pulse. Output pulse length can be varied from 35 ns to the maximum by choosingappropriate timing components. With Rext = 2 kΩ and Cext = 0, an output pulse typically of 30 ns is achievedthat can be used as a dc-triggered reset signal. Output rise and fall times are TTL compatible and independentof pulse length. Typical triggering and clearing sequences are shown as a part of the switching characteristicswaveforms.Pulse-width stability is achieved through internal compensation and is virtually independent of VCC andtemperature. In most applications, pulse stability is limited only 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 timingcapacitance (10 pF to 10 µF) and more than one decade of timing resistance (2 kΩ to 30 kΩ for the SN54221,2 kΩ to 40 kΩ for the SN74221, 2 kΩ to 70 kΩ for the SN54LS221, and 2 kΩ to 100 kΩ for the SN74LS221).Throughout these ranges, pulse width is defined by the relationship: tw(out) = CextRext In2 ≈ 0.7 CextRext. Incircuits where pulse cutoff is not critical, timing capacitance up to 1000 µF and timing resistance as low as 1.4 kΩcan be used. Also, the range of jitter-free output pulse widths is extended if VCC is held to 5 V and free-airtemperature is 25°C. Duty cycles as high as 90% are achieved when using maximum recommended RT. Higherduty cycles are available if a certain amount of pulse-width jitter is allowed.The variance in output pulse width from device to device typically is less than ±0.5% for given external timingcomponents. An example of this distribution for the ’221 is shown in Figure 3. Variations in output pulse widthversus supply voltage and temperature for the ’221 are shown in Figures 4 and 5, respectively.Pin assignments for these devices are identical to those of the SN54123/SN74123 or SN54LS123/SN74LS123so that the ’221 or ’LS221 devices can be substituted for those products in systems not using the retrigger bymerely changing the value of Rext and/or Cext; however, the polarity of the capacitor must be changed.

Product Attributes

TYPE DESCRIPTION Select all
Voltage - Supply 4.5 V ~ 5.5 V
Current - Output High, Low 4mA, 400µA
Schmitt Trigger Input No
Independent Circuits 2
Logic Type Monostable
Product Status Active
Package Tube
Supplier Device Package 16-CFP
Series 54LS
Package / Case 16-CFlatPack
Mounting Type Surface Mount
Operating Temperature -55°C ~ 125°C
Propagation Delay 50 ns

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Quantity Available: 2967
SZC Quality Assurance
Texas Instruments

Texas Instruments

Texas Instruments Incorporated (TI) is a global semiconductor powerhouse, crafts advanced analog ICs and embedded processors. Fueled by top-tier minds, TI's innovations drive tech's future, impacting 100,000+ clients.

View All Product from Texas Instruments
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