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PDF ISL3158AE Data sheet ( Hoja de datos )
| Número de pieza | ISL3158AE | |
| Descripción | RS-485/RS-422 Transceiver | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
April 3, 2009
ISL3158AE
FN6886.0
±16.5kV ESD (IEC61000-4-2) Protected,
Large Output Swing, 5V, Full Fail-Safe, 1/8
Unit Load, RS-485/RS-422 Transceiver
The ISL3158AE is a BiCMOS, IEC61000 ESD protected, 5V
powered, single transceiver that meets both the RS-485 and
RS-422 standards for balanced communication. Each driver
output and receiver input is protected against ±16.5kV ESD
strikes without latch-up.
The ISL3158AE transmitter delivers exceptional differential
output voltages (2.4V min), into the RS-485 required 54Ω
load, for better noise immunity or to allow up to eight 120Ω
terminations in “star” or other non-standard bus topologies.
This device has very low bus currents (+125µA/-75µA), so it
presents a true “1/8 unit load” to the RS-485 bus. This allows
up to 256 transceivers on the network without violating the
RS-485 specification’s 32 unit load maximum, and without
using repeaters.
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 bus. Rx outputs
feature high drive levels - typically 28mA @ VOL = 1V (to ease
the design of optocoupled isolated interfaces).
Hot Plug circuitry ensures that the Tx and Rx outputs remain
in a high impedance state until the power supply has
stabilized, and the Tx outputs are fully short circuit protected.
The ISL3158AE is a half duplex version. It multiplexes the
Rx inputs and Tx outputs to allow transceivers with output
disable functions in an 8 Ld package.
Features
• High Driver VOD . . . . . . . . . . . . . . 2.4V (Min) @ RD = 54Ω
- Better Noise Immunity, or Drive Up to 8 Terminations
• IEC61000 ESD Protection on RS-485 I/O Pins . . ±16.5kV
- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM
• Full Fail-safe (Open, Short, Terminated and Undriven)
Receivers
• High Rx IOL to Drive Opto-Couplers for Isolated
Applications
• Hot Plug Circuitry - Tx and Rx Outputs Remain
Three-State During Power-up/Power-down
• True 1/8 Unit Load Allows up to 256 Devices on the Bus
• Specified for Single 5V, 10% Tolerance, Supplies
• High Data Rates . . . . . . . . . . . . . . . . . . . . . up to 10Mbps
• Low Quiescent Supply Current . . . . . . . . . . . . . . . 600µA
Ultra Low Shutdown Supply Current . . . . . . . . . . . . 70nA
• -7V to +12V Common Mode Input Voltage Range
• Half Duplex Pinouts
• Pb-free (RoHS compliant)
• Three-State Rx and Tx Outputs
• Current Limiting for Driver Overload Protection
Applications
• Utility Meters and 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
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
HALF/FUL DATA RATE SLEW-RATE
# DEVICES
Rx/Tx
L DUPLEX (Mbps)
LIMITED? HOT PLUG ON BUS ENABLE?
ISL3158AEM
Half
10
No Yes 256 Yes
ISL3158AEMW
Half
10
No Yes 256 Yes
QUIESCENT
ICC (µA)
600
LOW POWER
SHUTDOWN?
Yes
PIN
COUNT
8
600 Yes N/A
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. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL3158AE
www.ADabtasSohleuette4UM.caomximum Ratings
VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC + 0.3V)
Input/Output Voltages
A/Y, B/Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -9V to +13V
A/Y, B/Z (Transient Pulse Through 100Ω) . . . . . . . . . . . . . . ±25V
RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC +0.3V)
Short Circuit Duration
Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . See Specifications Table
Thermal Information
Thermal Resistance (Typical, Note 1)
θJA (°C/W)
8 Ld SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
120
Maximum Junction Temperature (Plastic Package) . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . .-55°C to +125°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTE:
1. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are at VCC = 5V, TA = +25°C
(Note 2). 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.
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(°C) MIN TYP MAX UNITS
DC CHARACTERISTICS
Driver Differential VOUT (No load)
Driver Differential VOUT (Loaded)
Change in Magnitude of Driver
Differential VOUT for
Complementary Output States
VOD1
VOD2
ΔVOD
Full
RL = 100Ω (RS-422) (Figure 1A)
RL = 54Ω (RS-485) (Figure 1A)
RL = 15Ω (Eight 120Ω terminations) (Note 10)
RL = 60Ω, -7V ≤ VCM ≤ 12V (Figure 1B)
RL = 54Ω or 100Ω (Figure 1A)
Full
Full
25
Full
Full
-
2.8
2.4
-
2.4
-
-
3.6
3.1
1.65
3
0.01
VCC
-
VCC
-
-
0.2
V
V
V
V
V
V
Driver Common-Mode VOUT
Change in Magnitude of Driver
Common-Mode VOUT for
Complementary Output States
VOC
ΔVOC
RL = 54Ω or 100Ω (Figure 1A)
RL = 54Ω or 100Ω (Figure 1A)
Full -
- 3.15 V
Full - 0.01 0.2 V
Logic Input High Voltage
Logic Input Low Voltage
DI Input Hysteresis Voltage
Logic Input Current
Input Current (A/Y, B/Z)
Driver Short-Circuit Current,
VO = High or Low
Receiver Differential Threshold
Voltage
VIH
VIL
VHYS
IIN1
IIN2
IOSD1
DE, DI, RE
DE, DI, RE
DE, DI, RE
DE = 0V, VCC = 0V or 5.5V VIN = 12V
VIN = -7V
DE = VCC, -7V ≤ VY or VZ ≤ 12V (Note 4)
VTH -7V ≤ VCM ≤ 12V (Note 12)
Full 2 - - V
Full -
- 0.8 V
25 - 100 - mV
Full -2
-
2 µA
Full -
70 125 µA
Full -75
55
- µA
Full -
- ±250 mA
Full -200
-90
-50 mV
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
Receiver Output Low Current
ΔVTH
VOH
VOL
IOL
VCM = 0V
IO = -8mA, VID = -50mV
IO = -8mA, VID = -200mV
VO = 1V, VID = -200mV
25 - 20 - mV
Full VCC - 1.2 4.3
Full - 0.25
-
0.5
V
V
Full 15
28
- mA
5 FN6886.0
April 3, 2009
5 Page 
ISL3158AE
www.EDaStaDShPereot4tUe.cctoimon
All pins on this device includes class 3 (>7kV) Human Body
Model (HBM) ESD protection structures, but the RS-485
pins (driver outputs and receiver inputs) incorporate
advanced structures allowing them to survive ESD events
in excess of ±16.5kV HBM and ±16.5kV (1/2 duplex)
IEC61000-4-2. The RS-485 pins are particularly vulnerable
to ESD strikes because they typically connect to an
exposed port on the exterior of the finished product. Simply
touching the port pins, or connecting a cable, can cause an
ESD event that might destroy unprotected ICs. These new
ESD structures protect the device whether or not it is
powered up, and without degrading the RS-485 common
mode range of -7V to +12V. This built-in ESD protection
eliminates the need for board level protection structures
(e.g., transient suppression diodes), and the associated,
undesirable capacitive load they present.
IEC61000-4-2 Testing
The IEC61000 test method applies to finished equipment,
rather than to an individual IC. Therefore, the pins most likely
to suffer an ESD event are those that are exposed to the
outside world (the RS-485 pins in this case), and the IC is
tested in its typical application configuration (power applied)
rather than testing each pin-to-pin combination. The
IEC61000 standard’s lower current limiting resistor coupled
with the larger charge storage capacitor yields a test that is
much more severe than the HBM test. The extra ESD
protection built into this device’s RS-485 pins allows the
design of equipment meeting level 4 criteria without the need
for additional board level protection on the RS-485 port.
AIR-GAP DISCHARGE TEST METHOD
For this test method, a charged probe tip moves toward the
IC pin until the voltage arcs to it. The current waveform
delivered to the IC pin depends on approach speed,
humidity, temperature, etc., so it is difficult to obtain
repeatable results. The ISL3158AE 1/2 duplex RS-485 pins
withstand ±16.5kV air-gap discharges.
CONTACT DISCHARGE TEST METHOD
During the contact discharge test, the probe contacts the
tested pin before the probe tip is energized, thereby
eliminating the variables associated with the air-gap
discharge. The result is a more repeatable and predictable
test, but equipment limits prevent testing devices at voltages
higher than ±9kV. The RS-485 pins of all the ISL3158AE
versions survive ±9kV contact discharges.
Data Rate, Cables, and Terminations
RS-485/RS-422 are intended for network lengths up to
4000’, but the maximum system data rate decreases as the
transmission length increases. Devices operating at 10Mbps
are limited to lengths of less than 100’.
Twisted pair is the cable of choice for RS-485/RS-422
networks. Twisted pair cables tend to pick up noise and
other electromagnetically induced voltages as common
mode signals, which are effectively rejected by the
differential receivers in these ICs.
Proper termination is imperative, when using the 10Mbps
devices, to minimize reflections. Terminations are
recommended unless power dissipation is an overriding
concern.
In point-to-point, or point-to-multipoint (single driver on bus)
networks, the main cable should be terminated in its
characteristic impedance (typically 120Ω) at the end farthest
from the driver. In multi-receiver applications, stubs
connecting receivers to the main cable should be kept as
short as possible. Multipoint (multi-driver) systems require
that the main cable be terminated in its characteristic
impedance at both ends. Stubs connecting a transceiver to
the main cable should be kept as short as possible.
Built-In Driver Overload Protection
As stated previously, the RS-485 specification requires that
drivers survive worst case bus contentions undamaged.
These devices meet this requirement via driver output short
circuit current limit circuitry.
The driver output stages incorporate short circuit current
limiting circuitry which ensures that the output current never
exceeds the RS-485 specification, even at the common
mode voltage range extremes.
Low Power Shutdown Mode
This CMOS transceiver uses a fraction of the power required
by it’s bipolar counterparts, but it also includes a shutdown
feature that reduces the already low quiescent ICC to a 70nA
trickle. This device enters shutdown whenever the receiver
and driver are simultaneously disabled (RE = VCC and
DE = GND) for a period of at least 600ns. Disabling both the
driver and the receiver for less than 60ns guarantees that
the transceiver will not enter shutdown.
Note that receiver and driver enable times increase when
the transceiver enables from shutdown. Refer to Notes 5, 6,
7, 8 and 9, at the end of the “Electrical Specification” table on
page 6, for more information.
11 FN6886.0
April 3, 2009
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ISL3158AE.PDF ] | |
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