Datasheet

LTC2872
25
2872f
Typical applicaTions
Figure 27. Sharing RS232 Receiver Inputs
Figure 28. Low Voltage Microprocessor Interface
2872 F27
RA1 A1
A2
RXEN1
RS232
INPUT
* DOES NOT MEET RS232 SPECIFICATIONS
R
IN
RA2
RXEN2
S1
OUT1
OUT2
LTC2872
–OR–
S2
S2
1
0
1
0
S1
0
1
1
0
ACTIVE OUTPUT
OUT1
OUT2
NONE (Hi-Z)
OUT1, OUT2
R
IN
5k
5k
62.5k
2.5k*
RB1 B1
B2
RXEN1
RS232
INPUT
R
IN
RB2
RXEN2
S1
OUT1
OUT2
LTC2872
S2
2872 F28
3V TO 5.5V
1.7V TO V
CC
µP
LTC2872
LOGIC
LEVEL
SIGNALS
LINE
LEVEL
SIGNALS
RS232
AND/OR
RS485
V
CC
V
L
GND
V
CC
= 3V to 5.5V, V
L
= 1.7V to V
CC
. Logic input pins not shown are tied to a valid logic
state. External components necessary for operation are not shown.