GD75323
MULTIPLE RS-232 DRIVERS AND RECEIVERS
SLLS213A – JANUARY 1996 – REVISED JUNE 1999
APPLICATION INFORMATION
DiodesplacedinserieswiththeV andV leadsprotecttheGD75323inthefaultconditioninwhichthedevice
DD
SS
SS
outputs are shorted to V
ground (see Figure 15).
or V , and the power supplies are at low and provide low-impedance paths to
DD
V
DD
V
DD
Output
±15 V
GD75323
GD75323
V
SS
V
SS
Figure 15. Power-Supply Protection to Meet Power-Off Fault Conditions of TIA/EIA-232-F
TIA/EIA-232-F
DB9S
Connector
–12 V
TL16C450
ACE
10
9
8
7
6
5
4
3
2
1
11
12
13
14
15
16
17
18
19
20
5
GND
5DA
3RY
4DA
2RY
1RY
3DA
2DA
1DA
V
SS
9
43
RI
RI
DTR
CTS
SO
5DY
3RA
4DY
2RA
1RA
3DY
2DY
1DY
†
C5
37
40
13
36
11
41
42
DTR
CTS
TX
†
C4
GD75323
RTS
RX
RTS
SI
†
†
C3
6
DSR
DCD
DSR
DCD
†
C2
1
C1
V
CC
V
DD
12 V
5 V
†
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, V
DD
and V
both must be powered or tied to ground.
SS
Figure 16. Typical Connection
10
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