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74AHC257D Scheda tecnica(PDF) 8 Page - NXP Semiconductors |
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74AHC257D Scheda tecnica(HTML) 8 Page - NXP Semiconductors |
8 / 16 page 74AHC_AHCT257_2 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 02 — 9 May 2008 8 of 16 NXP Semiconductors 74AHC257; 74AHCT257 Quad 2-input multiplexer; 3-state 10. Dynamic characteristics Table 7. Dynamic characteristics Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 8. Symbol Parameter Conditions 25 °C −40 °C to +85 °C −40 °C to +125 °C Unit Min Typ[1] Max Min Max Min Max 74AHC257 tpd propagation delay nI0, nI1 to nY; see Figure 6 [2] VCC = 3.0 V to 3.6 V CL = 15 pF - 4.2 9.3 1.0 11.0 1.0 12.0 ns CL = 50 pF - 6.0 12.8 1.0 14.5 1.0 16.0 ns VCC = 4.5 V to 5.5 V CL = 15 pF - 2.9 5.9 1.0 7.0 1.0 7.5 ns CL = 50 pF - 4.2 7.9 1.0 9.0 1.0 11.5 ns S to nY; see Figure 6 [2] VCC = 3.0 V to 3.6 V CL = 15 pF - 5.2 11.0 1.0 13.0 1.0 14.0 ns CL = 50 pF - 7.4 14.5 1.0 16.5 1.0 18.5 ns VCC = 4.5 V to 5.5 V CL = 15 pF - 3.5 6.8 1.0 8.0 1.0 8.5 ns CL = 50 pF - 5.0 8.8 1.0 10.0 1.0 12.5 ns ten enable time OE to nY; see Figure 7 [3] VCC = 3.0 V to 3.6 V CL = 15 pF - 4.5 10.5 1.0 12.5 1.0 13.5 ns CL = 50 pF - 6.4 14.0 1.0 16.0 1.0 17.5 ns VCC = 4.5 V to 5.5 V CL = 15 pF - 3.2 6.8 1.0 8.0 1.0 8.5 ns CL = 50 pF - 4.5 8.8 1.0 10.0 1.0 12.5 ns tdis disable time OE to nY; see Figure 7 [4] VCC = 3.0 V to 3.6 V CL = 15 pF - 5.1 9.5 1.0 11.0 1.0 11.5 ns CL = 50 pF - 7.2 12.0 1.0 13.5 1.0 14.5 ns VCC = 4.5 V to 5.5 V CL = 15 pF - 3.4 6.5 1.0 7.0 1.0 8.5 ns CL = 50 pF - 4.9 7.9 1.0 9.0 1.0 9.5 ns CPD power dissipation capacitance fi = 1 MHz; VI = GND to VCC [5] 4 outputs switching via input S -45 - - - - - pF 1 output switching via input I -15 - - - - - pF |
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