ISL32457EIUZ-T7A Intersil, ISL32457EIUZ-T7A Datasheet - Page 4

• Manufacturer Part Number: ISL32457EIUZ-T7A
• Description: RS-422/RS-485 Interface IC 60V OVP POLV -40+85 5V RS-485 1/2 DUP
• Manufacturer: Intersil

Specifications of ISL32457EIUZ-T7A

• Product Category: RS-422/RS-485 Interface IC
• Rohs: yes
• Data Rate: 250 Kbps, 1 Mbps
• Operating Supply Voltage: 3.3 V to 5 V
• Supply Current: 4.5 mA
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Package / Case: MSOP-8
• Function: Transceiver
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Shutdown: Yes

Pin Descriptions
NAME
GND
A/Y
B/Z
PIN
V
INV
RO
RE
DE
NC
DI
A
B
Y
Z
CC
(14 LD SOIC)
ISL32450E,
ISL32453E,
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E
1, 8, 13
PIN #
6, 7
N/A
N/A
N/A
12
11
10
14
2
3
4
5
9
(10 LD MSOP)
ISL32450E,
ISL32453E,
PIN #
N/A
N/A
N/A
N/A
10
1
2
3
4
5
9
8
6
7
4
8 LD MSOP)
ISL32452E,
ISL32455E
(8 LD SOIC,
PIN #
N/A
N/A
N/A
N/A
N/A
N/A
1
2
3
4
5
6
7
8
8 LD MSOP)
ISL32457E
(8 LD SOIC,
PIN #
N/A
N/A
N/A
N/A
N/A
N/A
1
3
4
5
6
7
8
2
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).
Receiver output enable. RO is enabled when RE is low; RO is high impedance
when RE is high. Internally pulled low.
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.
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.
Ground connection.
±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.
±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.
±60V Fault Protected and ±15kV ESD protected RS-485/RS-422 non-inverting
receiver input.
±60V Fault Protected and ±15kV ESD protected RS-485/RS-422 inverting
receiver input.
±60V Fault Protected and ±15kV ESD protected RS-485/RS-422 non-inverting
driver output.
±60V Fault Protected and ±15kV ESD protected RS-485/RS-422 inverting
driver output.
System power supply input (3V to 5.5V).
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.
No Internal Connection.
FUNCTION
February 20, 2012
FN7921.0