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ISL3332_14 Datasheet, PDF (4/26 Pages) Intersil Corporation – 3.3V, ±15kV ESD Protected, Two Port, Dual Protocol (RS-232/RS-485) Transceivers
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ISL3332, ISL3333
TABLE 3. ISL3333 FUNCTION TABLE
SEL1 or 2 ON/OFF
0
1
0
1
0
1
0
1
X
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
SPA
INPUTS
SPB
RXEN 1 DEN 1
or 2
or 2 DE 1 or 2
RECEIVER
OUTPUTS
RA
RB
DRIVER
OUTPUTS
Y
Z
DRIVER
CHARGE DATA
PUMPS RATE
(NOTE 2) (Mbps)
MODE
X
X
0
0
N.A.
ON
ON High-Z High-Z ON
0.46 RS-232
X
X
0
1
N.A.
ON
ON
ON
ON
ON
0.46 RS-232
X
X
1
0
N.A. High-Z High-Z High-Z High-Z ON
0.46 RS-232
X
X
1
1
N.A. High-Z High-Z ON
ON
ON
0.46 RS-232
X
X
X
X
X
High-Z High-Z High-Z High-Z OFF
N.A. Shutdown
X
X
0
N.A.
0
ON High-Z * High-Z High-Z OFF
N.A. RS-485
0
0
0
N.A.
1
ON High-Z * ON
ON
OFF
0.46 RS-485
0
1
0
N.A.
1
ON High-Z * ON
ON
OFF 0.115 RS-485
1
0
0
N.A.
1
ON High-Z * ON
ON
OFF
20 RS-485
1
1
0
N.A.
1
ON High-Z * ON
ON
OFF
20 RS-485
X
X
1
N.A.
0
High-Z High-Z * High-Z High-Z OFF
N.A. RS-485
0
0
1
N.A.
1
High-Z High-Z * ON
ON
OFF
0.46 RS-485
0
1
1
N.A.
1
High-Z High-Z * ON
ON
OFF 0.115 RS-485
1
1
1
0
1
N.A.
1
High-Z High-Z * ON
ON
OFF
20 RS-485
1
1
1
1
1
N.A.
1
High-Z High-Z * ON
ON
OFF
20 RS-485
NOTE:
2. 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.
ISL3333 Truth Tables (FOR EACH PORT)
RS-232 TRANSMITTING MODE
INPUTS
OUTPUTS
SEL1 or 2 ON/OFF DEN1 or 2 DY
DZ
Y
Z
0
1
1
0
0
1
1
0
1
1
0
1
1
0
0
1
1
1
0
0
1
0
1
1
1
1
0
0
0
1
0
X
X High-Z High-Z
0
0
X
X
X High-Z High-Z
RS-485 TRANSMITTING MODE
INPUTS
OUTPUTS
DATA
RATE
SEL1 ON/ DE
or 2 OFF 1 or 2 SPA SPB DY
Y
1
1
1
0 0 0/1 1/0
Z Mbps
0/1 0.46
1
1
1
0 1 0/1 1/0
0/1 0.115
1
1
1
1 X 0/1 1/0
0/1
20
1
1
0
X X X High-Z High-Z N.A.
1
0
X
X X X High-Z High-Z N.A.
RS-232 RECEIVING MODE
INPUTS
OUTPUT
RXEN 1
SEL1 or 2 ON/OFF or 2
A
0
1
0
0
B
RA RB
0
1
1
0
1
0
0
1
1
0
0
1
0
1
0
0
1
0
1
0
1
1
0
0
0
1
0
Open Open 1
1
0
1
1
X
X High-Z High-Z
0
0
X
X
X High-Z High-Z
RS-485 RECEIVING MODE
INPUTS
OUTPUT
SEL1
or 2
1
RXEN 1
ON/OFF or 2
1
0
B-A
≥ -40mV
RA RB *
1 High-Z
1
1
0
≤ -200mV
0 High-Z
1
1
0 Open or Shorted 1 High-Z
together
1
1
1
X
High-Z High-Z
1
0
X
X
High-Z High-Z
* Internally pulled high through a 40kΩ resistor.
4
FN6362.0
May 27, 2008
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