MC1489 查看數據表（PDF） - ON Semiconductor

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MC1489

Quad Line EIA-232D Receivers

ON Semiconductor 

MC1489, MC1489A

TEST CIRCUITS

5.0 Vdc

RL

All diodes

1N3064

or equivalent

Ein

3.0 V

50%

50%

Ein

tPLH

EO

tTHL 1.5 V

tTLH

1.5 V

Eo

CL

tTLH and tTHL

measured

10% - 90%

CL = 15 pF = total parasitic capacitance which includes

probe and wiring capacitances

Figure 3. Switching Response

VR

R

C

1/4

Response Node

MC1489A

Vin

VO

C, capacitor is for noise filtering.

R, resistor is for threshold shifting.

Figure 4. Response Control Node

http://onsemi.com

4

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