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ISL3332 Datasheet, PDF (3/26 Pages) Intersil Corporation – 3.3V, ±15kV ESD Protected, Two Port, Dua Protocol RS-232/RS-485 Transceivers
◁
ISL3332, ISL3333
TABLE 2. ISL3332 FUNCTION TABLE
SEL1 or 2
0
INPUTS
ON/OFF
1
DE 1 or 2
N.A.
RECEIVER OUTPUTS
RA
RB
ON
ON
DRIVER OUTPUTS
Y
Z
ON
ON
CHARGE PUMPS
(NOTE 1)
ON
MODE
RS-232
X
0
X
High-Z
High-Z
High-Z
High-Z
OFF
Shutdown
1
1
0
ON
High-Z *
High-Z
High-Z
OFF
RS-485
1
1
1
ON
High-Z *
ON
ON
OFF
RS-485
NOTE:
1. Charge pumps are off if SEL1 = SEL2 = 1, or if ON/OFF = 0. If ON = 1, and either port is programmed for RS-232 mode, then the charge pumps
are on.
ISL3332 Truth Tables (FOR EACH PORT)
RS-232 TRANSMITTING MODE
INPUTS
OUTPUTS
SEL1 or 2 ON/OFF DY
DZ
Y
Z
0
1
0
0
1
1
0
1
0
1
1
0
0
1
1
0
0
1
0
1
1
1
0
0
0
0
X
X
High-Z High-Z
RS-485 TRANSMITTING MODE
INPUTS
OUTPUTS
SEL1 or 2 ON/OFF DE1 or 2 DY
Y
Z
1
1
1
0
1
0
1
1
1
1
0
1
1
1
0
X
High-Z High-Z
1
0
X
X
High-Z High-Z
RS-232 RECEIVING MODE
INPUTS
OUTPUT
SEL1 or 2 ON/OFF
A
0
1
0
B
RA
RB
0
1
1
0
1
0
1
1
0
0
1
1
0
0
1
0
1
1
1
0
0
0
1
Open Open
1
1
0
0
X
X
High-Z High-Z
RS-485 RECEIVING MODE
INPUTS
OUTPUT
SEL1 or 2 ON/OFF
1
1
B-A
≥ -40mV
RA
RB *
1 High-Z
1
1
≤ -200mV
0 High-Z
1
1 Open or Shorted together 1 High-Z
1
0
X
High-Z High-Z
* Internally pulled high through a 40kΩ resistor.
3
FN6362.0
May 27, 2008
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