ISL32450E Datasheet, PDF (4/21 Pages) Intersil Corporation – ±60V Fault Protected, 3.3V to 5V, ±20V Common Mode Range, RS-485/RS-422 Transceivers with Cable Invert and ±15kV ESD

ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E
Pin Descriptions
PIN
NAME
RO
ISL32450E,
ISL32453E,
(14 LD SOIC)
PIN #
ISL32450E,
ISL32453E,
(10 LD MSOP)
PIN #
ISL32452E,
ISL32455E
(8 LD SOIC,
8 LD MSOP)
PIN #
2
1
1
RE
3
2
2
DE
4
3
3
DI
5
4
4
GND
6, 7
5
5
A/Y
N/A
N/A
6
B/Z
N/A
N/A
7
A
12
9
N/A
B
11
8
N/A
Y
9
6
N/A
Z
10
7
N/A
V_CC
14
10
8
INV
N/A
N/A
N/A
NC
1, 8, 13
N/A
N/A
ISL32457E
(8 LD SOIC,
8 LD MSOP)
PIN #
FUNCTION
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).
N/A
Receiver output enable. RO is enabled when RE is low; RO is high impedance
when RE is high. Internally pulled low.
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.
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.
5
Ground connection.
6
±60V 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.
7
±60V 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 - B/Z is the inverting
receiver input and inverting driver output. If INV is high, B/Z is the non-inverting
receiver input and the non-inverting driver output. Pin is an input if DE = 0; pin
is an output if DE = 1.
N/A
±60V Fault Protected and ±15kV ESD protected RS-485/RS-422 non-inverting
receiver input.
N/A
±60V Fault Protected and ±15kV ESD protected RS-485/RS-422 inverting
receiver input.
N/A
±60V Fault Protected and ±15kV ESD protected RS-485/RS-422 non-inverting
driver output.
N/A
±60V Fault Protected and ±15kV ESD protected RS-485/RS-422 inverting
driver output.
8
System power supply input (3V to 5.5V).
2
Receiver and driver Cable Invert (polarity selection) input. When driven high
this pin swaps the polarity of the driver output and receiver input pins. If
unconnected (floating) or connected low, normal RS-485 polarity conventions
apply. Internally pulled low.
N/A
No Internal Connection.
4
FN7921.0
February 20, 2012