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74AHC_AHCT257 데이터시트(PDF) 10 Page - NXP Semiconductors |
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74AHC_AHCT257 데이터시트(HTML) 10 Page - NXP Semiconductors |
10 / 16 page 74AHC_AHCT257_2 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 02 — 9 May 2008 10 of 16 NXP Semiconductors 74AHC257; 74AHCT257 Quad 2-input multiplexer; 3-state 11. Waveforms Measurement points are given in Table 8. VOL and VOH are typical voltage output levels that occur with the output load. Fig 6. Data inputs and common data select input to output propagation delays mna486 tPHL tPLH VM VM nI0, nI1, S input nY output GND VI VOH VOL Measurement points are given in Table 8. VOL and VOH are typical voltage output levels that occur with the output load. Fig 7. Enable and disable times mna813 tPLZ tPHZ outputs disabled outputs enabled VY VX outputs enabled Qn output LOW-to-OFF OFF-to-LOW Qn output HIGH-to-OFF OFF-to-HIGH OE input VOL VOH VCC VI VM GND GND tPZL tPZH VM VM Table 8. Measurement points Type Input Output VM VM VX VY 74AHC257 0.5 × VCC 0.5 × VCC VOL + 0.3 V VOH − 0.3 V 74AHCT257 1.5 V 0.5 × VCC VOL + 0.3 V VOH − 0.3 V |
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