Dual Monostable Multivibrator
Data sheet acquired from Harris Semiconductor SCHS166F
November 1997 - Revised October 2003
CD54HC221, CD74HC221, CD74H...
Description
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 ...
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