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74HCT157 Datasheet(PDF) 8 Page - NXP Semiconductors |
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74HCT157 Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 18 page 74HC_HCT157 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 3 — 31 December 2010 8 of 18 NXP Semiconductors 74HC157; 74HCT157 Quad 2-input multiplexer [1] tpd is the same as tPLH and tPHL. [2] tt is the same as tTHL and tTLH. [3] CPD is used to determine the dynamic power dissipation (PD in W). 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. 11. Waveforms tt transition time nY; see Figure 7 [2] VCC = 4.5 V - 7 15 - 19 - 22 ns CPD power dissipation capacitance CL =50pF;f= 1 MHz; VI =GND to VCC [3] -70 - - - - - 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 9. Symbol Parameter Conditions Tamb = 25 C Tamb = 40 C to +85 C Tamb = 40 C to +125 C Unit Min Typ 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 7. Propagation delay input (nI0, nI1, S) to output (nYn) mna486 tPHL tPLH VM VM nI0, nI1, S input nY output GND VI VOH VOL |
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