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PDF ISL31485E Data sheet ( Hoja de datos )
| Número de pieza | ISL31485E | |
| Descripción | (ISL31480E - ISL31486E) RS-485/RS-422 Transceivers | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Fault Protected, Extended CMR, RS-485/RS-422
Transceivers with Cable Invert
ISL31480E, ISL31483E, ISL31485E, ISL31486E
The ISL3148xE are fault protected, 5V powered
differential transceivers that exceed the RS-485 and
RS-422 standards for balanced communication. The
RS-485 transceiver pins (driver outputs and receiver
inputs) are protected against faults up to ±60V.
Additionally, the extended common mode range allows
these transceivers to operate in environments with
common mode voltages up to ±25V (>2X the RS-485
requirement), making this RS-485 family one of the
most robust on the market.
Transmitters deliver an exceptional 2.5V (typical)
differential output voltage into the RS-485 specified 54Ω
load. This yields better noise immunity than standard
RS-485 ICs, or allows up to six 120Ω terminations in star
network topologies.
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.
The ISL31483E, ISL31485E and ISL31486E include cable
invert functions that reverse the polarity of the Rx and/or
Tx bus pins in case the cable is misconnected. Unlike
competing devices, Rx full fail-safe operation is
maintained even when the Rx input polarity is switched.
The ISL31480E and ISL31486E feature a logic supply
(VL) pin that sets the VOH of the Rx outputs, and the
switching points of the logic input pins, to be compatible
with a lower supply voltage (down to 1.8V) in mixed
voltage systems. See Table 1 on page 2 for key features
and configurations by device number.
Features
• Fault Protected RS-485 Bus Pins. . . . . . up to ±60V
• Extended Common Mode Range . . . . . . . . . . ±25V
More Than Twice the Range Required for RS-485
• Cable Invert Pins (Except ISL31480)
Corrects for Reversed Cable Connections While
Maintaining Rx Full Fail-safe Functionality
• Logic Supply (VL) Pin (ISL31480E, ISL31486E)
Simplifies Interface to Lower Voltage Logic Devices
• Full Fail-safe (Open, Short, Terminated) RS-485
Receivers
• 1/4 Unit Load (UL) for up to 128 Devices on the Bus
• High Rx IOL for Opto-Couplers in Isolated Designs
• Hot Plug Circuitry - Tx and Rx Outputs Remain
Three-State During Power-up/Power-down
• Slew Rate Limited RS-485 Data Rate . . . . . . 1Mbps
• Low Quiescent Supply Current . . . . . . . . . . . 2.3mA
Ultra Low Shutdown Supply Current . . . . . . . . 10µA
Applications*(see page 19)
• Utility Meters/Automated Meter Reading Systems
• High Node Count Systems
• PROFIBUS® and Field Bus Networks, and Factory
Automation
• Security Camera Networks
• Building Lighting and Environmental Control Systems
• Industrial/Process Control Networks
Exceptional Rx Operates at
1Mbps Even With ±25V
Common Mode Voltage
30
B
25
A
VID = ±1V
20
15
10
5
RO
0
-5
TIME (400ns/DIV)
Transceivers Deliver Superior
Common Mode Range vs.
Standard RS-485 Devices
25
12
0
-7
-12
-20
-25
STANDARD RS-485 CLOSEST
TRANSCEIVER COMPETITOR
ISL3148XE
June 25, 2010
FN7638.0
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL31480E, ISL31483E, ISL31485E, ISL31486E
www.DataSheet4U.com
Truth Tables
TRANSMITTING
INPUTS
OUTPUTS
RE DE DI INV or
DINV
Y
Z
X11
0
10
X10
0
01
X11
1
01
X10
1
10
00X
X High-Z High-Z
10X
X High-Z* High-Z*
NOTE: *Low Power Shutdown Mode (See Note 13),
except for ISL31485E.
RECEIVING
INPUTS
OUTPUT
RE DE (Half DE (Full A-B INV or RO
Duplex) Duplex)
RINV
00
X
≥ -0.01V
0
1
00
X
≤ -0.2V
0
0
00
X
≤ 0.01V
1
1
00
X
≥ 0.2V
1
0
00
X
Inputs
X
Open or
Shorted
1
10
0
X X High-Z*
11
1
X X High-Z
NOTE: *Low Power Shutdown Mode (See Note 13), except
for ISL31485E.
Typical Operating Circuits
+
0.1µF
ISL31486E HALF DUPLEX EXAMPLE (MSOP PIN NUMBERS SHOWN)
+1.8V +5V
10 9
+
0.1µF
3 VL
INV
1 RO R
2 RE
4 DE
VCC
A/Y 7
B/Z 8
RT
+
0.1µF
+5V +1.8V
9
VCC
10
VL
RT
8 B/Z
R RO 1
RE 2
7 A/Y
DE 4
5 DI
D
GND
6
GND
6
DI 5
D
3
INV
+
0.1µF
THE IC ON THE LEFT HAS THE CABLE CONNECTIONS
SWAPPED, SO THE INV PIN IS STRAPPED HIGH TO
INVERT ITS RX AND TX POLARITY
5 FN7638.0
June 25, 2010
5 Page 
ISL31480E, ISL31483E, ISL31485E, ISL31486E
www.DataSheet4U.com
Electrical Specifications Test Conditions: VCC = 4.5V to 5.5V, VL = VCC; Unless Otherwise Specified. Typicals are at
VCC = 5V, TA = +25°C (Note 8). Boldface limits apply over the operating temperature
range, -40°C to +85°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP MIN
MAX
(°C) (Note 16) TYP (Note 16) UNITS
Receiver Skew | tPLH -
tPHL |
Receiver Enable to
Output Low
tSKD
tZL
(Figure 5)
RL = 1kΩ, CL = 15pF, SW = VCC
(Figure 6), (Notes 12, 19)
Full -
Full -
4 10 ns
- 50 ns
Receiver Enable to
Output High
tZH RL = 1kΩ, CL = 15pF, SW = GND Full -
(Figure 6), (Notes 12, 19)
- 50 ns
Receiver Disable from
Output Low
tLZ RL = 1kΩ, CL = 15pF, SW = VCC
(Figure 6) (Note 19)
Full -
- 50 ns
Receiver Disable from
Output High
tHZ RL = 1kΩ, CL = 15pF, SW = GND Full -
(Figure 6) (Note 19)
- 50 ns
Time to Shutdown
tSHDN (Notes 13, 19)
Receiver Enable from
tZH(SHDN) RL = 1kΩ, CL = 15pF, SW = GND
Shutdown to Output High
(Figure 6), (Notes 13, 15, 19)
Full 60 160 600
ns
Full -
- 2000 ns
Receiver Enable from
tZL(SHDN) RL = 1kΩ, CL = 15pF, SW = VCC
Shutdown to Output Low
(Figure 6), (Notes 13, 15, 19)
Full -
- 2000 ns
NOTES:
8. All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device
ground unless otherwise specified.
9. Supply current specification is valid for loaded drivers when DE = 0V.
10. Applies to peak current. See “Typical Performance Curves” beginning on page 18 for more information
11. Keep RE = 0 to prevent the device from entering SHDN.
12. The RE signal high time must be short enough (typically <100ns) to prevent the device from entering SHDN.
13. Transceivers (except on the ISL31485E) are put into shutdown by bringing RE high and DE low. If the inputs are in this state
for less than 60ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 600ns, the parts
are guaranteed to have entered shutdown. See “Low Power Shutdown Mode” on page 17.
14. Keep RE = VCC, and set the DE signal low time >600ns to ensure that the device enters SHDN.
15. Set the RE signal high time >600ns to ensure that the device enters SHDN.
16. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established
by characterization and are not production tested.
17. See Figure 9 for more information, and for performance over-temperature.
18. Tested according to TIA/EIA-485-A, Section 4.2.6 (±80V for 15ms at a 1% duty cycle).
19. Does not apply to the ISL31485E. The ISL31485E has no Rx enable function, and thus no SHDN function.
20. See “Caution” statement in the “Recommended Operating Conditions” section on page 9.
Test Circuits and Waveforms
VL OR VCC
DE
DI
Z
D
Y
VOD
RL/2
RL/2 VOC
VL OR
VCC
DE
DI
Z
D
Y
RL/2
375Ω
VOD
VOC
RL/2
VCM
375Ω
FIGURE 1A. VOD AND VOC
FIGURE 1. DC DRIVER TEST CIRCUITS
FIGURE 1B. 1B
11
FN7638.0
June 25, 2010
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ISL31485E.PDF ] | |
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