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74VHC_VHCT245 датащи(PDF) 8 Page - NXP Semiconductors |
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74VHC_VHCT245 датащи(HTML) 8 Page - NXP Semiconductors |
8 / 16 page 74VHC_VHCT245_1 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 01 — 25 August 2009 8 of 16 NXP Semiconductors 74VHC245; 74VHCT245 Octal bus transceiver; 3-state [1] Typical values are measured at nominal supply voltage (VCC = 3.3 V and VCC = 5.0 V). [2] tpd is the same as tPLH and tPHL. [3] ten is the same as tPZL and tPZH. [4] tdis is the same as tPLZ and tPHZ. [5] CPD is used to determine the dynamic power dissipation (PD in µW). PD =CPD × VCC2 × fi × N+ Σ(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; Σ(C L × VCC 2 × f o) = sum of the outputs. 10.1 Waveforms tdis disable time OE to An; OE to Bn; signal name DIR; see Figure 6 [4] CL = 15 pF - 5.0 14.4 1.0 15.5 1.0 18.0 ns CL = 50 pF - 6.0 15.4 1.0 16.5 1.0 19.5 ns CPD power dissipation capacitance fi = 1 MHz; VI = GND to VCC [5] -15 - - - - - pF Table 7. Dynamic characteristics …continued Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 7. Symbol Parameter Conditions 25 °C −40 °C to +85 °C −40 °C to +125 °C Unit Min Typ[1] Max Min Max Min Max Measurement points are given in Table 8. VOL and VOH are typical voltage output levels that occur with the output load. Fig 5. Input to output propagation delays mna176 An, Bn input Bn, An output tPLH tPHL GND VI VM VM VM VM VOH VOL |
Аналогичный номер детали - 74VHC_VHCT245_15 |
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Аналогичное описание - 74VHC_VHCT245_15 |
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