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74AHC_AHCT257 데이터시트(PDF) 9 Page - NXP Semiconductors |
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74AHC_AHCT257 데이터시트(HTML) 9 Page - NXP Semiconductors |
9 / 16 page 74AHC_AHCT257_2 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 02 — 9 May 2008 9 of 16 NXP Semiconductors 74AHC257; 74AHCT257 Quad 2-input multiplexer; 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. 74AHCT257; VCC = 4.5 V to 5.5 V tpd propagation delay nI0, nI1 to nY; see Figure 6 [2] CL = 15 pF - 3.7 6.5 1.0 8.0 1.0 9.0 ns CL = 50 pF - 4.9 8.5 1.0 10.0 1.0 11.0 ns S to nY; see Figure 6 [2] CL = 15 pF - 5.1 9.0 1.0 10.5 1.0 11.5 ns CL = 50 pF - 6.4 10.5 1.0 12.5 1.0 13.5 ns ten enable time OE to nY; see Figure 7 [3] CL = 15 pF - 3.9 8.0 1.0 9.0 1.0 10.0 ns CL = 50 pF - 5.1 10.0 1.0 11.0 1.0 12.0 ns tdis disable time OE to nY; see Figure 7 [4] CL = 15 pF - 4.5 7.5 1.0 8.0 1.0 8.5 ns CL = 50 pF - 6.5 9.5 1.0 10.5 1.0 11.5 ns CPD power dissipation capacitance fi = 1 MHz; VI = GND to VCC [5] 4 outputs switching via input S -51 - - - - - pF 1 output switching via input I -15 - - - - - pF Table 7. Dynamic characteristics …continued 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 |
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