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MAX232DRE4 데이터시트(PDF) 6 Page - Texas Instruments |
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MAX232DRE4 데이터시트(HTML) 6 Page - Texas Instruments |
6 / 14 page MAX232, MAX232I DUAL EIA232 DRIVERS/RECEIVERS SLLS047L − FEBRUARY 1989 − REVISED MARCH 2004 6 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION T1IN or T2IN T1OUT or T2OUT CL = 10 pF (see Note B) TEST CIRCUIT ≤10 ns ≤10 ns Input Output tPHL tPLH VOL VOH 0 V 3 V 10% 90% 50% 5 µs WAVEFORMS 90% 50% 10% RL 90% 10% 90% 10% tTLH tTHL SR + 0.8 (V OH –V OL ) t TLH or 0.8 (V OL –V OH ) t THL NOTES: A. The pulse generator has the following characteristics: ZO = 50 Ω, duty cycle ≤ 50%. B. CL includes probe and jig capacitance. Pulse Generator (see Note A) EIA-232 Output Figure 2. Driver Test Circuit and Waveforms for tPHL and tPLH Measurements (5-µs Input) EIA-232 Output −3 V 3 V −3 V 3 V 3 k Ω 10% 1.5 V 90% WAVEFORMS 20 µs 1.5 V 90% 10% VOH VOL tTLH tTHL ≤10 ns ≤10 ns TEST CIRCUIT CL = 2.5 nF Pulse Generator (see Note A) Input Output SR + 6V t THL or t TLH NOTE A: The pulse generator has the following characteristics: ZO = 50 Ω, duty cycle ≤ 50%. Figure 3. Test Circuit and Waveforms for tTHL and tTLH Measurements (20-µs Input) |
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