SP335E Datasheet, PDF (20/22 Pages) Exar Corporation – RS-232/RS-485/RS-422 TRANSCEIVER

SP335E
RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
REV. 1.0.0
TABLE 3: RS-485/422 TX TRUTH TABLE
INPUTS
SHDN
RS-485/RS-232
DE/T2IN
0
X
X
1
1
0
1
1
1
1
1
1
X
0
X
DI/T1IN
X
X
0
1
X
OUTPUTS
Z(B)/T1OUT
Y(A)/T2OUT
1/8th unit load
1/8th unit load
1/8th unit load
1/8th unit load
1
0
0
1
RS-232 Mode
TABLE 4: RS-485/422 RX TRUTH TABLE
RS-485/RS-232
1
SHDN
0
INPUTS
HALF/FULL
RE
X
X
1
1
0
0
1
1
0
0
1
1
0
0
1
1
1
0
1
1
1
0
1
1
1
0
1
1
X
1
0
X
X
X
(A-B)
X
t-50mV
d -200mV
Floating
X
X
X
X
X
(Y-Z)
X
X
X
X
t-50mV
d -200mV
Floating
X
X
OUTPUT
RO/R2OUT
High-Z
1
0
1
1
0
1
High-Z
RS-232 Mode
TABLE 5: RS-485/422 TERMINATION TRUTH TABLE
FD_TX_TERM
PIN 12
X
0
1
X
X
X
TERM
PIN 13
0
1
1
0
1
X
RS-485/RS-232
PIN 14
1
1
1
1
1
0
HALF/FULL
PIN 15
0
0
0
1
1
X
TX TERM
PINS 3-4
-
-
ON
-
ON
-
The DE and RE pins have no effect on the termination setting in any mode.
RX TERM
PINS 18-19
-
ON
ON
-
-
-
20