CD74HC221

Data sheet acquired from Harris Semiconductor SCHS166F November 1997 - Revised October 2003 CD54HC221, CD74HC221, CD74HCT221 High-Speed CMOS Logic Dual Monostable Multivibrator with Reset [ /Title (CD74 HC221 , CD74 HCT22 1) /Subject (High Speed CMOS Logic Dual Monos table Multi- Features Description 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 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 Pinout CD54HC221 (CERDIP) CD74HC221 (PDIP, SOIC, SOP, TSSOP) CD74HCT221 (PDIP, SOIC) TOP VIEW 1A 1 1B 2 1R 3 1Q 4 2Q 5 2CX 6 2CXRX 7 GND 8 16 VCC 15 1CXRX 14 1CX 13 1Q 12 2Q 11 2R 10 2B 9 2A The ’HC221 and CD74HCT221 are dual monostable multivibrators with reset. 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 ...