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PDF ISL32452E Data sheet ( Hoja de datos )
| Número de pieza | ISL32452E | |
| Descripción | (ISL32450E - ISL32457E) RS-485/RS-422 Transceivers | |
| Fabricantes | Intersil | |
| Logotipo |  |
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±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 54Ω
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.
Free Datasheet http://www.datasheet4u.com/
1 page  
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E
Typical Operating Circuits
+3.3V
14 + 0.1µF
2 RO
3 RE
VCC A 12
R B 11
RT
4 DE
5 DI
D
Z 10
Y9
GND
6, 7
SOIC PINOUT SHOWN
+3.3V
+
0.1µF
14
9 Y VCC
10 Z
D DI 5
DE 4
RT 11 B
12 A
RE 3
R RO 2
GND
6, 7
ISL32450E, ISL32453E FULL DUPLEX NETWORK
+3.3V
8 + 0.1µF
1 RO
2 RE
VCC
R
B/Z
7
RT
3 DE
A/Y 6
+
0.1µF
+3.3V
8
VCC
RT 7 B/Z
6 A/Y
D DI 4
DE 3
RE 2
4 DI D
GND
5
R
GND
5
RO 1
ISL32452E, ISL32455E HALF DUPLEX NETWORK
2 INV
1 RO
3 DE
+3.3V
8
VCC
R A/Y
B/Z
+
0.1µF
6 RT
7
+
0.1µF
+3.3V
8
VCC
RT
7 B/Z
R RO 1
6 A/Y
DE 3
4 DI D
GND
5
THE IC ON THE LEFT HAS THE CABLE CONNECTIONS
SWAPPED, SO THE INV PIN IS STRAPPED HIGH TO
INVERT THE RX AND TX POLARITY
GND
5
D DI 4
2
INV
ISL32457E HALF DUPLEX NETWORK USING CABLE INVERT FUNCTION
5 FN7921.0
February 20, 2012
Free Datasheet http://www.datasheet4u.com/
5 Page 
ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E
Test Circuits and Waveforms (Continued)
RE
B
A
R RO
15pF
B
1.5V
A
1.5V
+2.25V
+750mV
SIGNAL
GENERATOR
+1.5V
SIGNAL
GENERATOR
tPLH
tPHL
RO
50%
50%
FIGURE 7A. TEST CIRCUIT
FIGURE 7B. MEASUREMENT POINTS
FIGURE 7. RECEIVER PROPAGATION DELAY AND DATA RATE
VCC
0V
SIGNAL
GENERATOR
RE
B
A
R RO
1kΩ
15pF
VCC
SW GND
NOTE 14
RE
50%
50%
3V
0V
PARAMETER
DE A
tHZ 0 +1.5V
tLZ 0 -1.5V
tZH (Note 13)
0 +1.5V
tZL (Note 13)
0 -1.5V
tZH(SHDN) (Note 16) 0 +1.5V
tZL(SHDN) (Note 16)
0
-1.5V
SW
GND
VCC
GND
VCC
GND
VCC
tZH, tZH(SHDN)
NOTE 14
RO
tZL, tZL(SHDN)
NOTE 14
RO
tHZ
OUTPUT HIGH
1.5V
VOH - 0.5V
VOH
0V
tLZ
1.5V
OUTPUT LOW
VCC
VOL + 0.5V VOL
FIGURE 8A. TEST CIRCUIT
FIGURE 8B. MEASUREMENT POINTS
FIGURE 8. RECEIVER ENABLE AND DISABLE TIMES
11 FN7921.0
February 20, 2012
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet ISL32452E.PDF ] | |
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