DUAL MONOSTABLE MULTIVIBRATORS

The LV221A devices are dual multivibrators designed for 2-V to 5.5-V VCC operation. Each multivibrator has a negative-transition-triggered (A) input and a positive-transition-triggered (B) input, either of which CAN be used as an inhibit input.
These edge-triggered multivibrators feature output pulse-duration control by three methods. In the first method, the A input is low and the B input goes high. In the second method, the B input is high and the A input goes low. In the third method, the A input is low, the B input is high, and the clear (CLR) input goes high.
The output pulse duration is programmable by selecting external resistance and capacitance values. The external Timing capacitor must be connected between Cext and Rext/Cext (positive) and an external resistor connected between Rext/Cext and VCC. To obtain variable pulse durations, connect an external variable resistor between Rext/Cext and VCC. The output pulse duration also CAN be reduced by taking CLR low.
Pulse triggering occurs at a particular voltage level and is not related directly to the transition time of the input pulse. The A, B, and CLR inputs have Schmitt Triggers with sufficient hysteresis to handle slow input transition rates with jitter-free triggering at the outputs.
Once triggered, the outputs are independent of further transitions of the A and B inputs and are a function of the Timing components, or the output pulses CAN be terminated by the overriding clear. Input pulses CAN be of any duration relative to the output pulse. Output pulse duration CAN be varied by choosing the appropriate Timing components. Output rise and fall times are TTL compatible and independent of pulse duration. Typical triggering and clearing sequences are illustrated in the input/output Timing diagram.
The variance in output pulse duration from device to device typically is less than 0.5% for given external Timing components. An example of this distribution for the ?LV221A is shown in Figure 8. Variations in output pulse duration versus supply voltage and temperature are shown in Figure 5.
During power up, Q outputs are in the low state, and Q outputs are in the high state. The outputs are glitch free, without applying a reset pulse.
These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down.
Pin assignments are identical to those of the ?AHC123A and ?AHCT123A devices, so the ?LV221A CAN be substituted for those devices not using the retrigger feature.
For additional application information on multivibrators, see the application report Designing With The SN74AHC123A and SN74AHCT123A literature number SCLA014.
By Texas Instruments
Part Manufacturer Description Datasheet Samples
SN74LV221APWT Texas Instruments DUAL MONOSTABLE MULTIVIBRATORS 16-TSSOP -40 to 85
SN74LV221AD Texas Instruments DUAL MONOSTABLE MULTIVIBRATORS 16-SOIC -40 to 85
SN74LV221ADGVR Texas Instruments DUAL MONOSTABLE MULTIVIBRATORS 16-TVSOP -40 to 85
SN74LV221AQPWRG4Q1 Texas Instruments Automotive Catalog Dual Monostable Multivibrators 16-TSSOP -40 to 125
SN74LV221ADG4 Texas Instruments DUAL MONOSTABLE MULTIVIBRATORS 16-SOIC -40 to 85
SN74LV221APW Texas Instruments DUAL MONOSTABLE MULTIVIBRATORS 16-TSSOP -40 to 85
SN74LV221AQPWRQ1 Texas Instruments Automotive Catalog Dual Monostable Multivibrators 16-TSSOP -40 to 125
SN74LV221ANSR Texas Instruments DUAL MONOSTABLE MULTIVIBRATORS 16-SO -40 to 85
SN74LV221ADR Texas Instruments DUAL MONOSTABLE MULTIVIBRATORS 16-SOIC -40 to 85
SN74LV221APWR Texas Instruments DUAL MONOSTABLE MULTIVIBRATORS 16-TSSOP -40 to 85
SN74LV221A 's PackagesSN74LV221A 's pdf datasheet
SN74LV221AD SOIC
SN74LV221ADBR SSOP
SN74LV221ADBRE4 SSOP
SN74LV221ADBRG4 SSOP
SN74LV221ADE4 SOIC
SN74LV221ADG4 SOIC
SN74LV221ADGVR TVSOP
SN74LV221ADGVRE4 TVSOP
SN74LV221ADGVRG4 TVSOP
SN74LV221ADR SOIC
SN74LV221ADRE4 SOIC
SN74LV221ADRG4 SOIC
SN74LV221ANSR SO
SN74LV221ANSRE4 SO
SN74LV221ANSRG4 SO
SN74LV221APW TSSOP
SN74LV221APWE4 TSSOP
SN74LV221APWG4 TSSOP
SN74LV221APWR TSSOP
SN74LV221APWRE4 TSSOP
SN74LV221APWRG4 TSSOP
SN74LV221APWT TSSOP
SN74LV221APWTE4 TSSOP
SN74LV221APWTG4 TSSOP




SN74LV221A Pinout, Pinouts
SN74LV221A pinout,Pin out
This is one package pinout of SN74LV221A,If you need more pinouts please download SN74LV221A's pdf datasheet.

SN74LV221A circuits will be updated soon..., now you can download the pdf datasheet to check the circuits!

Related Electronics Part Number

Related Keywords:

SN74LV221A Pb-Free SN74LV221A Cross Reference SN74LV221A Schematic SN74LV221A Distributor
SN74LV221A Application Notes SN74LV221A RoHS SN74LV221A Circuits SN74LV221A footprint
Hot categories