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CD74HCT273 Datasheet(PDF) 6 Page - Texas Instruments |
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CD74HCT273 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 8 page 6 Power Dissipation Capacitance (Notes 5, 6) CPD - 5 25 - - - pF HCT TYPES Propagation Delay, Clock to Output (Figure 4) tPLH, tPHL CL = 50pF 4.5 - 30 38 45 ns CL = 15pF 5 12 - - - ns Propagation Delay, MR to Output (Figure 4) tPHL CL = 50pF 4.5 - 32 40 48 ns Output Transition Time tTLH, tTHL CL = 50pF 4.5 - 15 19 22 ns Input Capacitance CIN -- - 10 10 10 pF Maximum Clock Frequency fMAX CL = 15pF 5 50 - - - MHz Power Dissipation Capacitance (Notes 5, 6) CPD - 5 25 - - - pF NOTES: 5. CPD is used to determine the dynamic power consumption, per flip-flop. 6. PD =CPD VCC 2 f i + ∑ (CL VCC 2 +f O) where fi = Input Frequency, fO = Output 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 TYP MAX MAX MAX Test Circuits and Waveforms NOTE: Outputs should be switching from 10% VCC to 90% VCC in accordance with device truth table. For fMAX, input duty cycle = 50%. FIGURE 1. HC CLOCK PULSE RISE AND FALL TIMES AND PULSE WIDTH NOTE: Outputs should be switching from 10% VCC to 90% VCC in accordance with device truth table. For fMAX, input duty cycle = 50%. FIGURE 2. HCT CLOCK PULSE RISE AND FALL TIMES AND PULSE WIDTH FIGURE 3. HC AND HCU TRANSITION TIMES AND PROPAGA- TION DELAY TIMES, COMBINATION LOGIC FIGURE 4. HCT TRANSITION TIMES AND PROPAGATION DELAY TIMES, COMBINATION LOGIC CLOCK 90% 50% 10% GND VCC trCL tfCL 50% 50% tWL tWH 10% tWL + tWH = fCL I CLOCK 2.7V 1.3V 0.3V GND 3V trCL = 6ns tfCL = 6ns 1.3V 1.3V tWL tWH 0.3V tWL + tWH = fCL I 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% CD74HC273, CD74HCT273 |
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