Transceivers. ISL32457E Datasheet

ISL32457E Datasheet PDF


Part

ISL32457E

Description

(ISL32450E - ISL32457E) RS-485/RS-422 Transceivers

Manufacture

Intersil

Page 21 Pages
Datasheet
Download ISL32457E Datasheet


ISL32457E Datasheet
±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
The ISL32450E through ISL32457E are 3.3V to 5V powered, fault
protected, extended common mode range differential transceivers
for balanced communication. The RS-485 bus pins (driver outputs
and receiver inputs) are protected against overvoltages up to
±60V, and against ±15kV ESD strikes. These transceivers operate
in environments with common mode voltages up to ±20V
(exceeds the RS-485 requirement), making this RS-485 family
one of the more robust on the market.
Features
• Fault Protected RS-485 Bus Pins . . . . . . . . . . . . . . Up to ±60V
• Extended Common Mode Range . . . . . . . . . . . . . . . . . . . ±20V
Larger Than Required for RS-485
• ±15kV HBM ESD Protection on RS-485 Bus Pins
• Wide Supply Range . . . . . . . . . . . . . . . . . . . . . . . . . 3V to 5.5V
Transmitters are RS-485 compliant with VCC 4.5V and deliver a
1.1V differential output voltage into the RS-485 specified 54
load even with VCC = 3V.
Receiver (Rx) inputs feature a “Full Fail-Safe” design, which
ensures a logic-high Rx output if Rx inputs are floating, shorted, or
on a terminated but undriven (idle) bus. Rx full fail-safe operation
is maintained even when the Rx input polarity is switched (cable
invert function on ISL32457E).
The ISL32457E includes a cable invert function that reverses the
polarity of the Rx and Tx bus pins in case the cable is
misconnected during installation.
• Cable Invert Pin (ISL32457E Only)
Corrects for Reversed Cable Connections While Maintaining Rx
Full Fail-safe Functionality
• 1/4 Unit Load for Up to 128 Devices on the Bus
• High Transient Overvoltage Tolerance . . . . . . . . . . . . . . . ±80V
• Full Fail-safe (Open, Short, Terminated) RS-485 Receivers
• Choice of RS-485 Data Rates . . . . . . . . . . . . 250kbps or 1Mbps
• Low Quiescent Supply Current . . . . . . . . . . . . . . . . . . . 2.1mA
Ultra Low Shutdown Supply Current . . . . . . . . . . . . . . . 10µA
• Pb-Free (RoHS Compliant)
See Table 1 on page 2 for key features and configurations by
device number.
Related Literature
Applications
• Utility Meters/Automated Meter Reading Systems
• Air Conditioning Systems
• See FN7784, “ISL32470E, ISL32472E, ISL32475E,
ISL32478E: Fault Protected, Extended Common Mode Range,
RS-485/RS-422 Transceivers with ±16.5kV ESD”
• Security Camera Networks
• Building Lighting and Environmental Control Systems
• Industrial/Process Control Networks
A
20
B
15
10
5
RO
0
VCC = 3V
VID = ±1V
2Mbps
TIME (200ns/DIV)
FIGURE 1. EXCEPTIONAL ISL32453E RX OPERATES AT >1Mbps
EVEN WITH ±20V COMMON MODE VOLTAGE
20
12
0
-7
-20
STANDARD RS-485
TRANSCEIVER
ISL3245XE
FIGURE 2. TRANSCEIVERS DELIVER SUPERIOR COMMON MODE
RANGE vs STANDARD RS-485 DEVICES
February 20, 2012
FN7921.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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ISL32457E Datasheet
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E
PART
NUMBER
ISL32450E
ISL32452E
ISL32453E
ISL32455E
ISL32457E
HALF/FULL
DUPLEX
Full
Half
Full
Half
Half
DATA RATE
(Mbps)
0.25
0.25
1
1
0.25
TABLE 1. SUMMARY OF FEATURES
SLEW-RATE
LIMITED?
EN
PINS?
HOT
PLUG
CABLE INVERT
(INV) PIN?
Yes Yes No
No
Yes Yes No
No
Yes Yes No
No
Yes Yes No
No
Yes
Tx Only
No
Yes
QUIESCENT ICC
(mA)
2.1
2.1
2.1
2.1
2.1
LOW POWER
SHDN?
Yes
Yes
Yes
Yes
No
PIN COUNT
10, 14
8
10, 14
8
8
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL32450EIBZ
ISL32450 EIBZ
-40 to +85
14 Ld SOIC
M14.15
ISL32450EIUZ
2450E
-40 to +85
10 Ld MSOP
M10.118
ISL32452EIBZ
32452 EIBZ
-40 to +85
8 Ld SOIC
M8.15
ISL32452EIUZ
2452E
-40 to +85
8 Ld MSOP
M8.118
ISL32453EIBZ
ISL32453 EIBZ
-40 to +85
14 Ld SOIC
M14.15
ISL32453EIUZ
2453E
-40 to +85
10 Ld MSOP
M10.118
ISL32455EIBZ
32455 EIBZ
-40 to +85
8 Ld SOIC
M8.15
ISL32455EIUZ
2455E
-40 to +85
8 Ld MSOP
M8.118
ISL32457EIBZ
32457 EIBZ
-40 to +85
8 Ld SOIC
M8.15
ISL32457EIUZ
2457E
-40 to +85
8 Ld MSOP
M8.118
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to Tech Brief TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information pages for ISL32450E , ISL32452E, ISL32453E, ISL32455E, ISL32457E. For more
information on MSL please see Tech Brief TB363.
2 FN7921.0
February 20, 2012
Free Datasheet http://www.datasheet4u.com/


Features Datasheet pdf ±60V Fault Protected, 3.3V to 5V, ±20V Common Mode Range, RS-485/RS-422 Trans ceivers with Cable Invert and ±15kV ES D ISL32450E, ISL32452E, ISL32453E, ISL3 2455E, ISL32457E The ISL32450E through ISL32457E are 3.3V to 5V powered, fault Features protected, extended common mo de range differential transceivers for balanced communication. The RS-485 bus pins (driver outputs and receiver input s) are protected against overvoltages u p to ±60V, and against ±15kV ESD stri kes. These transceivers operate in envi ronments with common mode voltages up t o ±20V (exceeds the RS-485 requirement ), making this RS-485 family one of the more robust on the market. Transmitter s are RS-485 compliant with VCC ≥ 4.5 V and deliver a 1.1V differential outpu t voltage into the RS-485 specified 54 load even with VCC = 3V. Receiver (R x) inputs feature a “Full Fail-Safe design, which ensures a logic-high Rx output if Rx inputs are floating, shor ted, or on a terminated but undriven (idle) bus. Rx full fail-safe operation .
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