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CD74HCT221MT Datasheet(PDF) 1 Page - Texas Instruments |
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CD74HCT221MT Datasheet(HTML) 1 Page - Texas Instruments |
1 / 21 page 1 Data sheet acquired from Harris Semiconductor SCHS166F 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 Pinout CD54HC221 (CERDIP) CD74HC221 (PDIP, SOIC, SOP, TSSOP) CD74HCT221 (PDIP, SOIC) TOP VIEW 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 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. 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 Ordering Information PART NUMBER TEMP. RANGE (oC) PACKAGE CD54HC221F3A -55 to 125 16 Ld CERDIP CD74HC221E -55 to 125 16 Ld PDIP CD74HC221M -55 to 125 16 Ld SOIC CD74HC221MT -55 to 125 16 Ld SOIC CD74HC221M96 -55 to 125 16 Ld SOIC CD74HC221NSR -55 to 125 16 Ld SOP CD74HC221PW -55 to 125 16 Ld TSSOP CD74HC221PWR -55 to 125 16 Ld TSSOP CD74HC221PWT -55 to 125 16 Ld TSSOP CD74HCT221E -55 to 125 16 Ld PDIP CD74HCT221M -55 to 125 16 Ld SOIC CD74HCT221MT -55 to 125 16 Ld SOIC CD74HCT221M96 -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. November 1997 - Revised October 2003 CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. Copyright © 2003, Texas Instruments Incorporated CD54HC221, CD74HC221, CD74HCT221 High-Speed CMOS Logic Dual Monostable Multivibrator with Reset [ /Title (CD74 HC221 , CD74 HCT22 1) /Sub- ject (High Speed CMOS Logic Dual Monos table Multi- |
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