ISL3330_14 Datasheet, PDF (4/25 Pages) Intersil Corporation – 3.3V, ±15kV ESD Protected, Dual Protocol (RS-232/RS-485) Transceivers

ISL3330, ISL3331
TABLE 3. ISL3331 FUNCTION TABLE
485/232
0
INPUTS
RXEN
AND/OR
ON
RXEN ^{DEN SLEW SPB}
RECEIVER
OUTPUTS
R_A
R_B
DRIVER
OUTPUTS
Y
Z
DRIVER
DATA
RATE
(Mbps)
CHARGE
PUMPS
(Note 3)
1
1 and 0
0
N/A
N/A High-Z High-Z High-Z High-Z
-
ON
MODE
RS-232
0
1
1 and 0
1
N/A
N/A High-Z High-Z ON
ON
0.46
ON
RS-232
0
1
0 or 1
0
N/A
N/A
ON
ON High-Z High-Z
-
ON
RS-232
0
1
0 or 1
1
N/A
N/A
ON
ON
ON
ON
0.46
ON
RS-232
0
0
1 and 0
1
N/A
N/A High-Z High-Z ON High-Z 0.46
ON
RS-232
0
0
0 or 1
0
N/A
N/A High-Z ON
ON High-Z 0.46
ON
RS-232
0
0
0 or 1
1
N/A
N/A
ON
ON
ON
ON
0.46
ON RS-232 (Note 4)
X
0
1 and 0
0
X
X High-Z High-Z High-Z High-Z
-
OFF
Shutdown
1
1
1 and 0
0
X
X High-Z High-Z High-Z High-Z
-
OFF
RS-485
1
X
1 and 0
1
0
1/0 High-Z High-Z ON
ON 0.46/0.115 OFF
RS-485
1
X
1 and 0
1
1
X High-Z High-Z ON
ON
20
OFF
RS-485
1
X
0 or 1
0
X
X
ON High-Z High-Z High-Z
-
OFF
RS-485
1
1
0 or 1
1
0
1/0
ON High-Z ON
ON 0.46/0.115 OFF
RS-485
1
1
0 or 1
1
1
X
ON High-Z ON
ON
20
OFF
RS-485
1
0
0 or 1
1
0
1/0
ON High-Z ON
ON 0.46/0.115 OFF RS-485 (Note 4)
1
0
0 or 1
1
1
X
ON High-Z ON
ON
20
OFF RS-485 (Note 4)
NOTES:
3. Charge pumps are on if in RS-232 mode and ON or DEN or RXEN is high, or RXEN is low.
4. Loopback is enabled when ON = 0, and DEN = 1, and (RXEN = 1 or RXEN = 0).
ISL3331 Truth Tables
485/232
0
0
0
0
0
RS-232 TRANSMITTING MODE
INPUTS (ON = 1)
OUTPUTS
DEN
D_Y
D_Z
Y
Z
1
0
0
1
1
1
0
1
1
0
1
1
0
0
1
1
1
1
0
0
0
X
X
High-Z High-Z
RS-232 RECEIVING MODE
INPUTS (ON = 1)
OUTPUT
485/232 RXEN and/or RXEN A
0
0 or 1
0
B
R_A R_B
0
1
1
0
0 or 1
0
1
1
0
0
0 or 1
1
0
0
1
0
0 or 1
1
1
0
0
0
0 or 1
Open Open 1
1
0
1 and 0
X
X High-Z High-Z
RS-485 TRANSMITTING MODE
INPUTS (ON = 1)
OUTPUTS DATA
485/232 DEN SLEW SPB D_Y
Y
1
1
0
0 0/1 1/0
Z Mbps
0/1 0.115
1
1
0
1 0/1 1/0 0/1 0.460
1
1
1
X 0/1 1/0 0/1
20
1
0
X
X
X High-Z High-Z -
RS-485 RECEIVING MODE
INPUTS (ON = 1)
OUTPUT
485/232 RXEN and/or RXEN
1
0 or 1
B-A
≥ -40mV
R_A R_B
1 High-Z
1
0 or 1
≤ -200mV
0 High-Z
1
0 or 1
Open or Shorted 1 High-Z
together
1
1 and 0
X
High-Z High-Z
4
FN6361.0
May 20, 2008