ISL32430E Datasheet, PDF (3/21 Pages) Intersil Corporation – ±40V Fault Protected, 3.3V to 5V, ±15V Common Mode Range, RS-485/RS-422 Transceivers With Cable Invert and ±15kV ESD

ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Pin Configurations (Continued)
ISL32432E, ISL32435E
(8 LD SOIC, 8 LD MSOP)
TOP VIEW
ISL32437E
(8 LD SOIC, 8 LD MSOP)
TOP VIEW
RO 1
R
RE 2
DE 3
DI 4
D
8 V_CC
7 B/Z
6 A/Y
5 GND
RO 1
R
INV 2
DE 3
DI 4
D
8 V_CC
7 B/Z
6 A/Y
5 GND
Truth Tables
TRANSMITTING
INPUTS
OUTPUTS
RE
DE
DI
INV (Note 4)
Y
Z
X
1
1
0
1
0
X
1
0
0
0
1
X
1
1
1
0
1
X
1
0
1
1
0
0
0
X
X
High-Z High-Z
1
0
X
X
High-Z* High-Z*
NOTES:
4. Parts without the INV pin follow the rows with INV = “0” and “X”.
*Low Power Shutdown Mode (See Notes 13 and 18).
RECEIVING
INPUTS
OUTPUT
RE DE (Half DE (Full
(Note 18) Duplex) Duplex)
A-B
INV (Note 4) RO
0
0
X
≥ -0.01V
0
1
0
0
X
≤ -0.2V
0
0
0
0
X
≤ 0.01V
1
1
0
0
X
≥ 0.2V
1
0
0
0
X
Inputs
X
1
Open or
Shorted
1
0
0
X
X
High-Z*
1
1
1
X
X
High-Z
NOTE: *Low Power Shutdown Mode (See Notes 13 and 18).
Pin Descriptions
PIN NUMBER
ISL32430E, ISL32430E,
PIN ISL32433E, ISL32433E, ISL32432E,
NAME 14 LD SOIC 10 LD MSOP ISL32435E ISL32437E
FUNCTION
RO
2
1
1
1
Receiver output. For parts without the cable invert function - or if INV is low - then: If
A - B ≥ -10mV, RO is high; if A - B ≤ -200mV, RO is low. If INV is high, then: If B - A ≥ -10mV,
RO is high; if B - A ≤ -200mV, RO is low. In all cases, RO = High if A and B are unconnected
(floating), or shorted together, or connected to an undriven, terminated bus (i.e., Rx is
always failsafe open, shorted, and idle, even if polarity is inverted).
RE
3
2
2
N/A Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE
is high. Internally pulled low.
DE
4
3
3
3
Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high, and
they are high impedance when DE is low. Internally pulled high.
DI
5
4
4
4
Driver input. For parts without the cable invert function - or if INV is low - a low on DI
forces output Y low and output Z high, while a high on DI forces output Y high and
output Z low. The output states, relative to DI, invert if INV is high.
GND
6, 7
5
5
5
Ground connection.
A/Y
N/A
N/A
6
6
±40V Fault Protected and ±15kV ESD protected RS-485/RS-422 I/O pin. For parts
without the cable invert function - or if INV is low - A/Y is the non-inverting receiver input
and non-inverting driver output. If INV is high, A/Y is the inverting receiver input and
the inverting driver output. Pin is an input if DE = 0; pin is an output if DE = 1.
3
FN7920.0
March 1, 2012