전자부품 데이터시트 검색엔진 |
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CD74FCT541SM 데이터시트(PDF) 6 Page - Texas Instruments |
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CD74FCT541SM 데이터시트(HTML) 6 Page - Texas Instruments |
6 / 7 page 8-6 Test Circuits and Waveforms NOTE: 8. Pulse Generator for All Pulses: Rate ≤ 1.0MHz; ZOUT ≤ 50Ω; tf, tr ≤ 2.5ns. FIGURE 1. TEST CIRCUIT FIGURE 2. ENABLE AND DISABLE TIMING FIGURE 3. PROPAGATION DELAY NOTES: 9. VOLP is measured with respect to a ground reference near the output under test. VOHV is measured with respect to VOH. 10. Input pulses have the following characteristics: PRR ≤ 1MHz, tr = 2.5ns, tf = 2.5ns, skew 1ns. 11. R.F. fixture with 700MHz design rules required. IC should be soldered into test board and bypassed with 0.1 µF capacitor. Scope and probes require 700MHz bandwidth. FIGURE 4. SIMULTANEOUS SWITCHING TRANSIENT WAVEFORMS 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 8) 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 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 OTHER OUTPUTS OUTPUT UNDER TEST VOH VOL VOH VOHV VOLP VOL |
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