75323G-S20-R datasheet(10/12 Pages) UTC

10 / 12 page

75323

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

10 of 12

www.unisonic.com.tw

QW-R113-007,B

APPLICATION INFORMATION

Diodes placed in series with the VDD and VSS leads protect the UTC 75323 in the fault condition in which the

device output are shorted to VDD or VSS, and the Power supplies are at low and provide low-impedance paths to

ground (see Figure7)

UTC

75323

UTC

75323

VDD

Output

±15V

VSS

VDD

VSS

Fig. 7 Power-Supply Protection to Meet Power-Off Fault Condition of TIA/EIA-232-F

DTR

CTS

RTS

DSR

DCD

12V

DTR

CTS

RTS

DSR

DCD

-12V

C5*

C4*

C3*

C2*

C1*

GND

5DA

3RY

4DA

2RY

1RY

3DA

2DA

1DA

Vcc

VSS

5DY

3RA

4DY

2RA

1RA

3DY

2DY

1DY

VDD

UTC

75323

TL16C450

ACE

TIA/EIA-232-F

DB9S

CONNECTOR

Fig. 8 Typical Connection

*See Figure Slew Rate vs. Load Capacitance to select the correct values for the loading capacitors (C1, C2, C3, C4

and C5), which may be required to meet the RS-232 maximum slew-rate requirement of 30V/us. The value of the

loading capacitors resrequired depends upon the line length and desired slew rate, but is typically 330pF.

Note C: To use the receivers only, VDD and Vss both must be powered or tied to ground.

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