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CD74HCT221M 데이터시트(PDF) 1 Page - Texas Instruments |
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CD74HCT221M 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 11 page 1 Data sheet acquired from Harris Semiconductor SCHS166A 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 . . . -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 CD74HC221, and CH74HCT221 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 500Ω. The minimum value of external capacitance, CX, is 0pF. The calculation for the pulse width is tW = 0.7 RXCX at VCC = 4.5V. Pinout CD74HC221, CD74HCT221 (PDIP, SOIC) TOP VIEW Ordering Information PART NUMBER TEMP. RANGE (oC) PACKAGE PKG. NO. CD74HC221E -55 to 125 16 Ld PDIP E16.3 CD74HCT221E -55 to 125 16 Ld PDIP E16.3 CD74HC221M -55 to 125 16 Ld SOIC M16.15 CD74HCT221M -55 to 125 16 Ld SOIC M16.15 NOTES: 1. When ordering, use the entire part number. Add the suffix 96 to obtain the variant in the tape and reel. 2. Wafer or die are available which meets all electrical specifications. Please contact your local sales office or Harris customer service for ordering information. 14 15 16 9 13 12 11 10 1 2 3 4 5 7 6 8 1A 1B 1R 1Q 2Q 2CX GND 2CXRX VCC 1CX 1Q 2Q 2R 2B 2A 1CXRX November 1997 - Revised April 1999 CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. Copyright © Harris Corporation 1997 CD74HC221, CD74HCT221 High Speed CMOS Logic Dual Monostable Multivibrator with Reset File Number 1670.1 [ /Title (CD74 HC221 , CD74 HCT22 1) /Sub- ject (High Speed CMOS Logic Dual Monos table Multi- |
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