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CD74FCT245M 数据表(PDF) 5 Page - Texas Instruments |
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CD74FCT245M 数据表(HTML) 5 Page - Texas Instruments |
5 / 7 page 5 Test Circuits and Waveforms NOTE: 9. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; ZOUT ≤ 50Ω; tf, tr ≤ 2.5ns. FIGURE 1. TEST CIRCUIT FIGURE 2. SETUP, HOLD, AND RELEASE TIMING FIGURE 3. PULSE WIDTH FIGURE 4. ENABLE AND DISABLE TIMING FIGURE 5. PROPAGATION DELAY 3V 0 DUT PULSE ZO GEN 7V 500 Ω 50pF 500 Ω VCC RT RT = ZO V0 CL RL RL VI tr, tf = 2.5ns (NOTE 9) SWITCH POSITION TEST SWITCH tPLZ, tPZL, Open Drain Closed tPHZ, tPZH, tPLH, tPHL Open DEFINITIONS: CL = Load capacitance, includes jig and probe capacitance. RT = Termination resistance, should be equal to ZOUT of the Pulse Generator. VIN = 0V to 3V. Input: tr =tf = 2.5ns (10% to 90%), unless otherwise specified ASYNCHRONOUS CONTROL tH tSH 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V 3V 1.5V 0V tH tSH PRESET CLEAR CLOCK ENABLE ETC. SYNCHRONOUS CONTROL tREM DATA INPUT TIMING INPUT tW LOW-HIGH-LOW PULSE HIGH-LOW-HIGH PULSE 1.5V 1.5V 3V 1.5V 0V CONTROL INPUT OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH SWITCH OPEN tPZL 3.5V 1.5V 1.5V 0V tPLZ tPHZ tPZH 0V 3.5V 0.3V 0.3V VOL VOH SWITCH CLOSED ENABLE DISABLE 1.5V 3V 0V 1.5V 3V 0V tPLH SAME PHASE INPUT TRANSITION tPHL tPLH tPHL OPPOSITE PHASE INPUT TRANSITION OUTPUT 1.5V VOH VOL CD54FCT245, CD74FCT245 |
类似零件编号 - CD74FCT245M |
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类似说明 - CD74FCT245M |
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