GD75323_16 Datasheet, PDF (10/19 Pages) Texas Instruments – MULTIPLE RS-232 DRIVERS AND RECEIVERS

GD75323
MULTIPLE RS-232 DRIVERS AND RECEIVERS
SLLS213A – JANUARY 1996 – REVISED JUNE 1999
APPLICATION INFORMATION
Diodes placed in series with the V_DD and V_SS leads protect the GD75323 in the fault condition in which the device
outputs are shorted to V_DD or V_SS, and the power supplies are at low and provide low-impedance paths to
ground (see Figure 15).
VDD
GD75323
Output
± 15 V
VDD
GD75323
VSS
VSS
Figure 15. Power-Supply Protection to Meet Power-Off Fault Conditions of TIA / EIA-232-F
TL16C450
ACE
RI ⁴³
DTR ³⁷
CTS ⁴⁰
SO ¹³
RTS ³⁶
SI ¹¹
DSR ⁴¹
DCD ⁴²
10
GND
9
5DA
8
3RY
7
4DA
6
2RY
5
1RY
4
3DA
3
2DA
2
1DA
1
VCC
5V
GD75323
– 12 V
11
VSS
12
5DY
13
3RA
14
4DY
15
2RA
16
1RA
17
3DY
18
2DY
19
1DY
20
VDD
RI
DTR
CTS
TX
RTS
RX
DSR
DCD ^C2†
12 V
C5†
C4†
C3†
C1†
TIA/EIA-232-F
DB9S
Connector
5
9
6
1
† _{See Figure 10 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 30 V/µs. The value of the loading capacitors required depends upon the line length and desired slew rate,
but is typically 330 pF.
NOTE C: To use the receivers only, VDD and VSS both must be powered or tied to ground.
Figure 16. Typical Connection
10
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