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CD74HC20 Datasheet(PDF) 5 Page - Texas Instruments |
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CD74HC20 Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 6 page 
5 Transition Times (Figure1) tTLH, tTHL CL = 50pF 2 - - 75 - 95 - 110 ns 4.5 - - 15 - 19 - 22 ns 6 - - 13 - 16 - 19 ns Input Capacitance CI - - - - 10 - 10 - 10 pF Power Dissipation Capacitance (Notes 5, 6) CPD - 5 - 26 - ---- pF HCT TYPES Propagation Delay, Input to Output (Figure 2) tPLH, tPHL CL = 50pF 4.5 - - 28 - 35 - 42 ns Propagation Delay, Data Input to Output Y tPLH, tPHL CL = 15pF 5 - 11 - ---- ns Transition Times (Figure 2) tTLH, tTHL CL = 50pF 4.5 - - 15 - 19 - 22 ns Input Capacitance CI - - - - 10 - 10 - 10 pF Power Dissipation Capacitance (Notes 5, 6) CPD - 5 - 38 - ---- pF NOTES: 5. CPD is used to determine the dynamic power consumption, per gate. 6. PD = VCC 2 f i (CPD + CL) where fi = input frequency, CL = output load capacitance, VCC = supply voltage. Switching Specifications Input tr, tf = 6ns (Continued) PARAMETER SYMBOL TEST CONDITIONS VCC (V) 25oC -40oC TO 85oC -55oC TO 125oC UNITS MIN TYP MAX MIN MAX MIN MAX Test Circuits and Waveforms FIGURE 1. HC AND HCU TRANSITION TIMES AND PROPAGA- TION DELAY TIMES, COMBINATION LOGIC FIGURE 2. HCT TRANSITION TIMES AND PROPAGATION DELAY TIMES, COMBINATION LOGIC tPHL tPLH tTHL tTLH 90% 50% 10% 50% 10% INVERTING OUTPUT INPUT GND VCC tr = 6ns tf = 6ns 90% tPHL tPLH tTHL tTLH 2.7V 1.3V 0.3V 1.3V 10% INVERTING OUTPUT INPUT GND 3V tr = 6ns tf = 6ns 90% CD74HC20, CD74HCT20 |
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