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CD74AC253MG4 Datasheet(PDF) 6 Page - Texas Instruments |
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CD74AC253MG4 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 15 page 6 FIGURE 1. THREE-STATE PROPAGATION DELAY WAVEFORMS AND TEST CIRCUIT FIGURE 2. PROPAGATION DELAY TIMES DUT WITH THREE- STATE OUTPUT INPUT LEVEL 90% VS 10% GND tf = 3ns tPZL tPZH tPLZ tPHZ OUTPUTS ENABLED OUTPUTS DISABLED OUTPUT: LOW TO OFF TO LOW OUTPUT: HIGH TO OFF TO HIGH OTHER INPUTS (TIED HIGH OR LOW) OUTPUT DISABLE CL 50pF 500 Ω† RL 500 Ω† RL OUT VS 0.2VCC VOL (≠ GND) VOH (≠ VCC) 0.8 VCC VS GND (tPHZ, tPZH) OUTPUTS ENABLED OPEN (tPHL, tPLH) 2 VCC (tPLZ, tPZL) (OPEN DRAIN) tr = 3ns OUTPUT DISABLE †FOR AC SERIES ONLY: WHEN VCC = 1.5V, RL = 1kΩ tr = 3ns tf = 3ns I OR S INPUT OUTPUT Y tPLH tPHL 90% VS 10% VS LEVEL DUT OUTPUT RL (NOTE) OUTPUT LOAD 500 Ω CL 50pF NOTE: For AC Series Only: When VCC = 1.5V, RL = 1kΩ. FIGURE 3. PROPAGATION DELAY TIMES AC ACT Input Level VCC 3V Input Switching Voltage, VS 0.5 VCC 1.5V Output Switching Voltage, VS 0.5 VCC 0.5 VCC CD74AC253, CD54/74ACT253 |
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