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CD74HCT138M Datasheet(PDF) 5 Page - Texas Instruments |
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CD74HCT138M Datasheet(HTML) 5 Page - Texas Instruments |
5 / 19 page 5 Enable to Output HC/HCT138 tPLH, tPHL CL = 50pF 2 - - 150 - 190 - 265 ns 4.5 - - 30 - 38 - 53 ns 6 - - 26 - 33 - 45 ns Output Transition Time (Figure 1) tTLH, tTHL CL = 50pF 2 - - 75 - 95 - 110 ns 4.5 - - 15 - 19 - 22 ns 6 - - 13 - 16 - 19 ns Power Dissipation Capacitance (Notes 3, 4) CPD CL = 15pF 5 - 67 - - - - - pF Input Capacitance CIN - - - - 10 - 10 - 10 pF HCT TYPES Propagation Delay Address to Output tPLH, tPHL CL = 50pF 4.5 - - 35 - 44 - 53 ns CL = 15pF 5 - 14 - - - - - ns Enable to Output HC/HCT138 tPLH, tPHL CL = 50pF 4.5 - - 35 - 44 - 53 ns Enable to Output HC/HCT238 tPLH, tPHL CL = 15pF 4.5 - - 40 - 50 - 60 ns Output Transition Time (Figure 2) tTLH, tTHL CL = 50pF 4.5 - - 15 - 19 - 22 ns Power Dissipation Capacitance (Notes 3, 4) CPD CL = 15pF 5 - 67 - - - - - pF Input Capacitance CIN - - - - 10 - 10 - 10 pF NOTES: 3. CPD is used to determine the dynamic power consumption, per gate. 4. 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 7. HC AND HCU TRANSITION TIMES AND PROPAGA- TION DELAY TIMES, COMBINATION LOGIC FIGURE 8. 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% CD54/74HC138, CD54/74HCT138, CD54/74HC238, CD54/74HCT238 |
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