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SN65C3221DBR Datasheet(PDF) 7 Page - Texas Instruments |
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SN65C3221DBR Datasheet(HTML) 7 Page - Texas Instruments |
7 / 19 page SN65C3221, SN75C3221 3V TO 5.5V SINGLECHANNEL RS232 COMPATIBLE LINE DRIVER/RECEIVER SLLS351E − APRIL 2002 − REVISED OCTOBER 2004 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION 50 Ω TEST CIRCUIT VOLTAGE WAVEFORMS −3 V −3 V 3 V 3 V 0 V 3 V Output Input VOL VOH tTLH Generator (see Note B) RL 3 V FORCEOFF RS-232 Output tTHL CL (see Note A) SR(tr) + 6V t THL or tTLH NOTES: A. CL includes probe and jig capacitance. B. The pulse generator has the following characteristics: PRR = 250 kbit/s, ZO = 50 Ω, 50% duty cycle, tr ≤ 10 ns, tf ≤ 10 ns. Figure 1. Driver Slew Rate 50 Ω TEST CIRCUIT VOLTAGE WAVEFORMS 0 V 3 V Output Input VOL VOH tPLH Generator (see Note B) RL 3 V FORCEOFF RS-232 Output tPHL CL (see Note A) NOTES: A. CL includes probe and jig capacitance. B. The pulse generator has the following characteristics: PRR = 250 kbit/s, ZO = 50 Ω, 50% duty cycle, tr ≤ 10 ns, tf ≤ 10 ns. 50% 50% 1.5 V 1.5 V Figure 2. Driver Pulse Skew TEST CIRCUIT VOLTAGE WAVEFORMS 50 Ω −3 V 3 V Output Input VOL VOH tPHL Generator (see Note B) tPLH Output CL (see Note A) 3 V or 0 V FORCEON NOTES: A. CL includes probe and jig capacitance. B. The pulse generator has the following characteristics: ZO = 50 Ω, 50% duty cycle, tr ≤ 10 ns, tf ≤ 10 ns. 3 V FORCEOFF 1.5 V 1.5 V 50% 50% Figure 3. Receiver Propagation Delay Times |
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