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MM74HC251MTC Datasheet(PDF) 4 Page - Fairchild Semiconductor |
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MM74HC251MTC Datasheet(HTML) 4 Page - Fairchild Semiconductor |
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4 / 7 page  www.fairchildsemi.com 4 AC Electrical Characteristics VCC = 5V, TA = 25°C, CL = 15 pF, tr = tf = 6 ns AC Electrical Characteristics CL = 50 pF, tr = tf = 6 ns (unless otherwise specified) Note 5: CPD determines the no load dynamic power consumption, PD = CPD VCC 2 f + I CC VCC, and the no load dynamic current consumption, IS = CPDVCCf + ICC. Symbol Parameter Conditions Typ Guaranteed Units Limit tPHL, tPLH Maximum Propagation Delay 26 35 ns A, B or C to Y tPHL, tPLH Maximum Propagation 27 35 ns Delay, A, B or C to W tPHL, tPLH Maximum Propagation 22 29 ns Delay, Any D to Y tPHL, tPLH Maximum Propagation 24 32 ns Delay, Any D to W tPZH, tPZL Maximum Output Enable RL = 1 kΩ 19 27 ns Time, W Output CL = 50 pF tPZH, tPZL Maximum Output Enable RL = 1 kΩ 19 26 ns Time, Y Output CL = 50 pF tPHZ, tPLZ Maximum Output Disable Time RL = 1 kΩ 26 40 ns W Output CL = 5 pF tPHZ, tPLZ Maximum Output Disable Time RL = 1 kΩ 27 35 ns Y Output CL = 5 pF Symbol Parameter Conditions VCC TA = 25°CTA = −40 to 85°CTA = −55 to 125°C Units Typ Guaranteed Limits tPHL, tPLH Maximum Propagation Delay 2.0V 90 205 256 300 ns A, B or C to Y 4.5V 31 41 51 60 ns 6.0V 26 35 44 51 ns tPHL, tPLH Maximum Propagation 2.0V 95 205 256 300 ns Delay, A, B or C to W 4.5V 32 41 51 60 ns 6.0V 27 35 44 51 ns tPHL, tPLH Maximum Propagation 2.0V 70 195 244 283 ns Delay, any D to Y 4.5V 27 39 49 57 ns 6.0V 23 33 41 48 ns tPHL, tPLH Maximum Propagation 2.0V 75 185 231 268 ns Delay, any D to W 4.5V 29 37 46 54 ns 6.0V 25 32 40 46 ns tPZH, tPZL Maximum Output Enable Time RL = 1 kΩ 2.0V 45 150 188 218 ns W Output 4.5V 21 30 38 44 ns 6.0V 18 26 33 38 ns tPZH, tPZL Maximum Output Enable Time RL = 1 kΩ 2.0V 45 145 181 210 ns Y Output 4.5V 21 29 36 42 ns 6.0V 18 25 31 36 ns tPHZ, tPLZ Maximum Output Disable Time RL = 1 kΩ 2.0V 60 220 275 319 ns W Output 4.5V 29 44 55 64 ns 6.0V 25 37 46 54 ns tPHZ, tPLZ Maximum Output Disable Time RL = 1 kΩ 2.0V 60 195 244 283 ns Y Output 4.5V 30 39 49 57 ns 6.0V 26 33 41 48 ns tTHL, tTLH Maximum Output Rise 2.0V 30 75 95 110 ns and Fall Time 4.5V 8 15 19 22 ns 6.0V 7 13 16 19 ns CPD Power Dissipation Capacitance (Note 5) (per package) 110 pF CIN Maximum Input Capacitance 5 10 10 10 pF |
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