CD74HC221 High Speed CMOS Logic Dual Monostable Multivibrators with Reset | TI.com

CD74HC221 (ACTIVE) High Speed CMOS Logic Dual Monostable Multivibrators with Reset

High Speed CMOS Logic Dual Monostable Multivibrators with Reset - CD74HC221
Datasheet
 

Description

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 wide range of output pulse widths from the Q and Q\ terminals. Pulse triggering on the B input occurs at a particular voltage level and is not related to the rise and fall time of the trigger pulse.

Once triggered, the outputs are independent of further trigger inputs on 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. On power up, the IC is reset. If either Mono is not used each input (on the unused device) must be terminated either high or low.

The minimum value of external resistance, RX, is typically 500. The minimum value of external capacitance, CX, is 0pF. The calculation for the pulse width is tW = 0.7 RXCX at VCC = 4.5V.

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 B Inputs
  • Fanout (Over Temperature Range)
    • Standard Outputs . . . . 10 LSTTL Loads
    • Bus Driver Outputs . . . . 15 LSTTL Loads
  • Wide Operating Temperature Range . . . –55°C to 125°C
  • 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

Data sheet acquired from Harris Semiconductor

Parametrics

Compare all products in Monostable multivibrator (one-shot) Email Download to Excel
Part number Order Technology Family VCC (Min) (V) VCC (Max) (V) Bits (#) Voltage (Nom) (V) F @ nom voltage (Max) (MHz) ICC @ nom voltage (Max) (mA) tpd @ nom Voltage (Max) (ns) IOL (Max) (mA) IOH (Max) (mA) Schmitt trigger Rating Operating temperature range (C) Package Group
CD74HC221 Order now HC     2     6     2     3.3
5    
70     0.08     45     5.2     -5.2     No     Catalog     -55 to 125     PDIP | 16
SOIC | 16
SO | 16
TSSOP | 16    
CD54HC221 Samples not available HC     2     6     2     3.3
5    
70     0.08     45     5.2     -5.2     No     Military     -55 to 125     CDIP | 16