SP335E_17 Datasheet, PDF (11/23 Pages) Exar Corporation – TRANSCEIVER WITH INTERNAL TERMINATION

SP335E
REV. 1.0.2
RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
FIGURE 2. RS-485 FULL DUPLEX MODE
Cc
1.0µF
C1
0.1µF
C3
0.1µF
C2
0.1µF
C4
0.1µF
32
31
30
29
28
27
26
25
1
GND _SP335
2
24
32 pin QFN
RS-485 Full Duplex 23
Z
3
D
120Ω
Y
4
5
DI
22
DE
21
__
RE
20
6
RO
7
R
120Ω
B
19
A
18
8
9
GND
17
10
11
12
13
14
15
16
Pins 12, 13, and 20 have 300k internal pull-downs (not shown).
Termination control follows the truth table on page 20.
The full duplex driver termination is enabled only when both TERM and FD_TX_TERM are high.
11