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74AHCT157 데이터시트(PDF) 3 Page - NXP Semiconductors |
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74AHCT157 데이터시트(HTML) 3 Page - NXP Semiconductors |
3 / 16 page 1999 Sep 24 3 Philips Semiconductors Product specification Quad 2-input multiplexer 74AHC157; 74AHCT157 QUICK REFERENCE DATA GND = 0 V; Tamb =25 °C; tr =tf ≤ 3.0 ns. Notes 1. CPD is used to determine the dynamic power dissipation (PD in µW). PD =CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where: fi = input frequency in MHz; fo = output frequency in MHz; ∑ (CL × VCC2 × fo) = sum of outputs; CL = output load capacitance in pF; VCC = supply voltage in Volts. 2. The condition is VI = GND to VCC. PINNING SYMBOL PARAMETER CONDITIONS TYPICAL UNIT AHC AHCT tPHL/tPLH propagation delay nI0,nI1 to nY CL = 15 pF; VCC = 5 V 3.2 3.4 ns StonY CL = 15 pF; VCC = 5 V 4.5 5.1 ns EtonY CL = 15 pF; VCC = 5 V 3.7 4.0 ns CI input capacitance VI =VCC or GND 3.0 3.0 pF CO output capacitance 4.0 4.0 pF CPD power dissipation capacitance CL = 50 pF; f = 1 MHz; notes 1 and 2 4 outputs switching via S 31 41 pF 1 output switching via I 13 16 pF PIN SYMBOL DESCRIPTION 1 S common data select input 2, 5, 11 and 14 1I0 to 4I0 data inputs from source 0 3, 6, 10 and 13 1I1 to 4I1 data inputs from source 1 4, 7, 9 and 12 1Y to 4Y multiplexer outputs 8 GND ground (0 V) 15 E enable input (active LOW) 16 VCC DC supply voltage |
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