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CD54HC4538 データシート(PDF) 1 Page - Texas Instruments |
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CD54HC4538 データシート(HTML) 1 Page - Texas Instruments |
1 / 11 page 1 Data sheet acquired from Harris Semiconductor SCHS123 Features • Retriggerable/Resettable Capability • Trigger and Reset Propagation Delays Independent of RX, CX • Triggering from the Leading or Trailing Edge • Q and Q Buffered Outputs Available • Separate Resets • Wide Range of Output-Pulse Widths • Schmitt Trigger Input on A and B Inputs • Retrigger Time is Independent of CX • 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 CD54HC4538, CD74HC4538, CD74HCT4538 (PDIP, SOIC, CERDIP) TOP VIEW Description The Harris CD54HC4538, CD74HC4538 and CD74HCT4538 are dual retriggerable/resettable monostable precision multivibrators for fixed voltage timing applications. 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. The propagation delay from trigger input-to-output transition and the propagation delay from reset input-to-output transition are independent of RX and CX. Leading-edge triggering (A) and trailing edge triggering (B) inputs are provided for triggering from either edge of the input pulse. An unused “A” input should be tied to GND and an unused B should be tied to VCC. On power up the IC is reset. Unused resets and sections must be terminated. In normal operation the circuit retriggers on the application of each new trigger pulse. To operate in the non-triggerable mode Q is connected to B when leading edge triggering (A) is used or Q is connected to A when trailing edge triggering (B) is used. The period ( τ) can be calculated from τ = (0.7) RX, CX; RMIN is 5kΩ. CMIN is 0pF. 14 15 16 9 13 12 11 10 1 2 3 4 5 7 6 8 1CX 1RXCX 1R 1A 1B 1Q GND 1Q VCC 2RXCX 2R 2A 2B 2Q 2Q 2CX Ordering Information PART NUMBER TEMP. RANGE (oC) PACKAGE PKG. NO. CD54HC4538F -55 to 125 16 Ld CERDIP F16.3 CD74HC4538E -55 to 125 16 Ld PDIP E16.3 CD74HCT4538E -55 to 125 16 Ld PDIP E16.3 CD74HC4538M -55 to 125 16 Ld SOIC M16.15 CD74HCT4538M -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 and die for this part number is available which meets all electrical specifications. Please contact your local sales office or Harris customer service for ordering information. CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures. Copyright © Harris Corporation 1998 File Number 1671.2 CD54HC4538, CD74HC4538, CD74HCT4538 High Speed CMOS Logic Dual Retriggerable Precision Monostable Multivibrator [ /Title (CD54 HC453 8, CD74 HC453 8, CD74 HCT45 38) /Sub- ject (High Speed CMOS Logic June 1998 |
同様の部品番号 - CD54HC4538 |
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同様の説明 - CD54HC4538 |
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