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CD54HC123

Texas Instruments
Part Number CD54HC123
Manufacturer Texas Instruments
Description High-Speed CMOS Logic Dual Retriggerable Monostable Multivibrators
Published Oct 15, 2019
Detailed Description Data sheet acquired from Harris Semiconductor SCHS142F September 1997 - Revised October 2003 CD54/74HC123, CD54/74HCT12...
Datasheet PDF File CD54HC123 PDF File

CD54HC123
CD54HC123


Overview
Data sheet acquired from Harris Semiconductor SCHS142F September 1997 - Revised October 2003 CD54/74HC123, CD54/74HCT123, CD74HC423, CD74HCT423 High-Speed CMOS Logic Dual Retriggerable Monostable Multivibrators with Resets [ /Title (CD74 HC123 , CD74 HCT12 3, CD74 HC423 , CD74 HCT42 3) /Subject (High Speed Features • Overriding Reset Terminates Output Pulse • Triggering From the Leading or Trailing Edge • Q and Q Buffered Outputs • Separate Resets • Wide Range of Output-Pulse Widths • Schmitt Trigger on Both A and B Inputs • Fanout (Over Temperature Range) - Standard Outputs .
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10 LSTTL Loads - Bus Driver Outputs .
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15 LSTTL Loads • Wide Operating Temperature Range .
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-55oC to 125oC • Balanced Propagation Delay and Transition Times • Significant Power Reduction Compared to LSTTL Logic ICs • HC Types - 2V to 6V Operation - High Noise Immunity: NIL = 30%, NIH = 30%of VCC at VCC = 5V • HCT Types - 4.
5V to 5.
5V Operation - Direct LSTTL Input Logic Compatibility, VIL= 0.
8V (Max), VIH = 2V (Min) - CMOS Input Compatibility, Il ≤ 1µA at VOL, VOH Description The ’HC123, ’HCT123, CD74HC423 and CD74HCT423 are dual monostable multivibrators with resets.
They are all retriggerable and differ only in that the 123 types can be triggered by a negative to positive reset pulse; whereas the 423 types do not have this feature.
An external resistor (RX) and an external capacitor (CX) control the timing and the accuracy for the circuit.
Adjustment of Rx and CX provides a wide range of output pulse widths from the Q and Q terminals.
Pulse triggering on the A and B inputs occur at a particular voltage level and is not related to the rise and fall times of the trigger pulses.
Once triggered, the output pulse width may be extended by retriggering inputs A and B.
The output pulse can be terminated by a LOW level on the Reset (R) pin.
Trailing edge triggering (A) and leading edge triggering (B) inputs are provided for triggering from eithe...



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