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CD74HC123E Datasheet(PDF) 1 Page - Texas Instruments |
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CD74HC123E Datasheet(HTML) 1 Page - Texas Instruments |
1 / 19 page 1 Data sheet acquired from Harris Semiconductor SCHS142F September 1997 - Revised October 2003 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 . . . . . . . . . . . . . . . 10 LSTTL Loads - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads • Wide Operating Temperature Range . . . -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 either edge of the input pulse. If either Mono is not used each input on the unused device (A, B, and R) must be terminated high or low. The minimum value of external resistance, Rx is typically 5k Ω. The minimum value external capacitance, CX, is 0pF. The calculation for the pulse width is tW = 0.45 RXCX at VCC = 5V. Ordering Information PART NUMBER TEMP. RANGE (oC) PACKAGE CD54HC123F3A -55 to 125 16 Ld CERDIP CD54HCT123F3A -55 to 125 16 Ld CERDIP CD74HC123E -55 to 125 16 Ld PDIP CD74HC123M -55 to 125 16 Ld SOIC CD74HC123MT -55 to 125 16 Ld SOIC CD74HC123M96 -55 to 125 16 Ld SOIC CD74HC123NSR -55 to 125 16 Ld SOP CD74HC123PW -55 to 125 16 Ld TSSOP CD74HC123PWR -55 to 125 16 Ld TSSOP CD74HC123PWT -55 to 125 16 Ld TSSOP CD74HC423E -55 to 125 16 Ld PDIP CD74HC423M -55 to 125 16 Ld SOIC CD74HC423MT -55 to 125 16 Ld SOIC CD74HC423M96 -55 to 125 16 Ld SOIC CD74HC423NSR -55 to 125 16 Ld SOP CD74HCT123E -55 to 125 16 Ld PDIP CD74HCT123M -55 to 125 16 Ld SOIC CD74HCT123MT -55 to 125 16 Ld SOIC CD74HCT123M96 -55 to 125 16 Ld SOIC CD74HCT423E -55 to 125 16 Ld PDIP CD74HCT423MT -55 to 125 16 Ld SOIC CD74HCT423M96 -55 to 125 16 Ld SOIC NOTE: When ordering, use the entire part number. The suffixes 96 and R denote tape and reel. The suffix T denotes a small-quantity reel of 250. CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. Copyright © 2003, Texas Instruments Incorporated 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) /Sub- ject (High Speed |
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Similar Description - CD74HC123E |
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