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74HCT423BQ Arkusz danych(PDF) 10 Page - NXP Semiconductors |
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74HCT423BQ Arkusz danych(HTML) 10 Page - NXP Semiconductors |
10 / 23 page 74HC_HCT423_3 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 03 — 24 July 2008 10 of 23 NXP Semiconductors 74HC423; 74HCT423 Dual retriggerable monostable multivibrator with reset [1] tpd is the same as tPHL and tPLH. [2] tt is the same as tTHL and tTLH. [3] For other REXT and CEXT combinations see Figure 8. If CEXT > 10 pF, the next formula is valid: tW = K × REXT × CEXT (typ.), where: tW = output pulse width in ns; REXT = external resistor in kΩ; CEXT = external capacitor in pF; K = 0.55 for VCC = 2.0 V and 0.45 for VCC = 5.0 V; see Figure 9. Inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF. [4] 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 set-up time of a retrigger pulse is valid: trtrig = 30 + 0.19 × REXT × CEXT0.9 + 13 × REXT1.05 (typ.); where: trtrig = retrigger time in ns; CEXT = external capacitor in pF; REXT = external resistor in kΩ. Inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF. [5] When the device is powered-up, initiate the device via a reset pulse, when CEXT < 50 pF. [6] CPD is used to determine the dynamic power dissipation (PD in µW): PD =CPD × VCC2 × fi × N+ ∑ (CL × VCC2 × fo); where: fi = input frequency in MHz; fo = output frequency in MHz; CL = output load capacitance in pF; VCC = supply voltage in V; N = number of inputs switching; ∑ (C L × VCC 2 × f o) = sum of outputs. CPD power dissipation capacitance per package; VI = GND to VCC − 1.5 V [6] - 56 - ---- pF Table 7. Dynamic characteristics …continued GND = 0 V; test circuit see Figure 12. Symbol Parameter Conditions 25 °C −40 °Cto +85 °C −40 °Cto +125 °C Unit Min Typ Max Min Max Min Max |
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