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74HCT123DB датащи(PDF) 10 Page - NXP Semiconductors |
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74HCT123DB датащи(HTML) 10 Page - NXP Semiconductors |
10 / 24 page 74HC_HCT123_5 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 05 — 13 July 2009 10 of 24 NXP Semiconductors 74HC123; 74HCT123 Dual retriggerable monostable multivibrator with reset [1] tpd is the same as tPHL and tPLH; tt is the same as tTHL and tTLH [2] For other REXT and CEXT combinations see Figure 7. If CEXT > 10 nF, the next formula is valid. tW =K × REXT × CEXT, where: tW = typical output pulse width in ns; REXT = external resistor in kΩ; CEXT = external capacitor in pF; K = constant = 0.45 for VCC = 5.0 V and 0.55 for VCC = 2.0 V. The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF. [3] The time to retrigger the monostable multivibrator depends on the values of REXT and CEXT. The output pulse width will only be extended when the time between the active-going edges of the trigger input pulses meets the minimum retrigger time. If CEXT >10 pF, the next formula (at VCC = 5.0 V) for the setup time of a retrigger pulse is valid: trtrig = 30 + 0.19 × REXT × CEXT0.9 +13 × REXT1.05, where: trtrig = retrigger time in ns; CEXT = external capacitor in pF; REXT = external resistor in kΩ. The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF. [4] When the device is powered-up, initiate the device via a reset pulse, when CEXT <50pF. [5] CPD is used to determine the dynamic power dissipation (PD in µW). PD =CPD × VCC2 × fi + ∑(CL × VCC2 × fo) + 0.75 × CEXT × VCC2 × fo +D × 16 × VCC where: fi = input frequency in MHz; fo = output frequency in MHz; D = duty factor in %; CL = output load capacitance in pF; VCC = supply voltage in V; CEXT = timing capacitance in pF; ∑(CL × VCC2 × fo) sum of outputs. tW pulse width VCC = 4.5 V nA LOW; see Figure 10 20 3 - 25 - 30 - ns nB HIGH; see Figure 10 20 5 - 25 - 30 - ns nRD LOW; see Figure 11 20 7 - 25 - 30 - ns nQ HIGH and nQLOW; VCC = 5.0 V; see Figure 10 and 11 [2] CEXT = 100 nF; REXT = 10 kΩ - 450 - - - - - µs CEXT = 0 pF; REXT =5kΩ -75- - - - - ns trtrig retrigger time nA, nB; CEXT = 0 pF; REXT =5kΩ;VCC = 5.0 V; see Figure 10 [3][4] - 110 - - - - - ns REXT external timing resistor VCC = 5.0 V; see Figure 7 2 - 1000 - - - - k Ω CEXT external timing capacitor VCC = 5.0 V; see Figure 7 [4] --- - - - - pF CPD power dissipation capacitance per monostable; VI = GND to VCC [5] -56- - - - - pF Table 7. Dynamic characteristics …continued Voltages are referenced to GND (ground = 0 V); CL = 50 pF unless otherwise specified; for test circuit see Figure 12. Symbol Parameter Conditions 25 °C −40 °C to +85 °C −40 °C to +125 °C Unit Min Typ Max Min Max Min Max |
Аналогичный номер детали - 74HCT123DB |
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Аналогичное описание - 74HCT123DB |
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