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SN75177B Datasheet(PDF) 7 Page - Texas Instruments |
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SN75177B Datasheet(HTML) 7 Page - Texas Instruments |
7 / 12 page SN75177B, SN75178B DIFFERENTIAL BUS REPEATERS SLLS002C – D2606, JULY 1985 – REVISED FEBRUARY 1993 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2–7 PARAMETER MEASUREMENT INFORMATION 1.3 V 1.5 V VOLTAGE WAVEFORMS 1.3 V 0 V 3 V VOL VOH tPHL tPLH 1.5 V Output Input TEST CIRCUIT (see Note B) CL = 15 pF Output 1.5 V 50 Ω Generator (see Note A) Figure 6. Receiver Propagation Delay Times VOH 0.5 V ≈ 1.3 V tPHZ 1.5 V 0 V 3 V S1 to 1.5 V S2 Closed S3 Closed tPLZ ≈ 1.3 V VOL 0.5 V 1.5 V 0 V S1 to –1.5 V S2 Closed S3 Closed 3 V ≈ 4.5 V VOL 1.5 V 0 V 1.5 V 3 V tPZL 0 V 1.5 V VOH 0 V Output Input tPZH S1 to 1.5 V S2 Open S3 Closed 1.5 V 3 V TEST CIRCUIT (see Note B) CL = 15 pF 50 Ω S3 5 V S2 2 k Ω 5 k Ω S1 –1.5 V 1.5 V VOLTAGE WAVEFORMS (see Note C) Output Output Input Output Input Output Input (SN75178B) (SN75177B) (SN75178B) (SN75177B) (SN75178B) (SN75177B) (SN75178B) (SN75177B) S1 to –1.5 V S2 Closed S3 Open Generator (see Note A) Figure 7. Receiver Output Enable and Disable Times NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR ≤ 1 MHz, 50% duty cycle, tr ≤ 6 ns, tf ≤ 6 ns, ZO = 50 Ω. B. CL includes probe and jig capacitance. C. All diodes are 1N916 or equivalent. |
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