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PDF ISL3158E Data sheet ( Hoja de datos )
| Número de pieza | ISL3158E | |
| Descripción | (ISL3150E - ISL3158E) RS-485/RS-422 Transceivers | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
ISL3150E, ISL3152E, ISL3153E,
ISL3155E, ISL3156E, ISL3158E
December 14, 2006
FN6363.0
±16.5kV ESD (IEC61000-4-2) Protected,
Large Output Swing, 5V, Full Fail-Safe, 1/8
Unit Load, RS-485/RS-422 Transceivers
The ISL315XE are BiCMOS, IEC61000 ESD protected, 5V
powered, single transceivers that meet 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 ISL315XE transmitters all deliver 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.
These devices have very low bus currents (+125μA/-75μA),
so they present 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
thewww.DataSheet4U.com design of optocoupled isolated interfaces).
The ISL3150E, ISL3152E, ISL3153E, ISL3155E utilize slew
rate limited drivers which reduce EMI, and minimize reflections
from improperly terminated transmission lines, or unterminated
stubs in multidrop and multipoint applications.
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 ISL3150E, ISL3153E, ISL3156E are configured for full
duplex applications. The half duplex versions multiplex the
Rx inputs and Tx outputs to allow transceivers with output
disable functions in 8 Ld packages.
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
• Tiny MSOP Packages Save 50% Board Space
• 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 20Mbps
• Low Quiescent Supply Current . . . . . . . . . . . . . . . 600μA
Ultra Low Shutdown Supply Current . . . . . . . . . . . . 70nA
• -7V to +12V Common Mode Input Voltage Range
• Half and Full Duplex Pinouts
• Pb-Free Packaging (RoHS Compliant)
• Three-State Rx and Tx Outputs
• Current Limiting and Thermal Shutdown 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
PART
NUMBER
ISL3150E
ISL3152E
ISL3153E
ISL3155E
ISL3156E
ISL3158E
TABLE 1. SUMMARY OF FEATURES
HALF/FULL DATA RATE SLEW-RATE
# DEVICES
Rx/Tx
DUPLEX
(Mbps)
LIMITED? HOT PLUG ON BUS ENABLE?
Full 0.115 Yes Yes 256 Yes
Half 0.115 Yes Yes 256 Yes
Full 1
Yes Yes 256 Yes
Half 1
Yes Yes 256 Yes
Full 20
No Yes 256 Yes
Half 20
No Yes 256 Yes
QUIESCENT
ICC (μA)
600
600
600
600
600
600
LOW POWER PIN
SHUTDOWN? COUNT
Yes 10, 14
Yes 8
Yes 10, 14
Yes 8
Yes 10, 14
Yes 8
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. 2004-2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL3150E, ISL3152E, ISL3153E, ISL3155E, ISL3156E, ISL3158E
Absolute Maximum Ratings
VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC + 0.3V)
Input/Output Voltages
A/Y, B/Z, A, B, Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . -9V to +13V
A/Y, B/Z, A, B, Y, Z (Transient Pulse Through 100Ω) . . . . . . ±25V
RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC +0.3V)
Short Circuit Duration
Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
Thermal Information
Thermal Resistance (Typical, Note 3)
θJA (°C/W)
8 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . .
105
8 Ld MSOP Package . . . . . . . . . . . . . . . . . . . . . . . .
140
10 Ld MSOP Package . . . . . . . . . . . . . . . . . . . . . . .
130
14 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . .
130
Maximum Junction Temperature (Plastic Package) . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . +300°C
(Lead Tips Only)
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
3. 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 4)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(°C)
MIN
TYP MAX UNITS
DC CHARACTERISTICS
Driver Differential VOUT (No load)
VOD1
Full -
-
VCC
V
Driver Differential VOUT (Loaded)
VOD2 RL = 100Ω (RS-422) (Figure 1A)
Full 2.8
3.6
-
V
RL = 54Ω (RS-485) (Figure 1A)
Full 2.4
3.1 VCC V
RL = 15Ω (Eight 120Ω terminations) (Note 13)
25
-
1.65 -
V
RL = 60Ω, -7V ≤ VCM ≤ 12V (Figure 1B)
Full 2.4 3 - V
Change in Magnitude of Driver
Differential VOUT for
Complementary Output States
ΔVOD RL = 54Ω or 100Ω (Figure 1A)
Full
-
0.01 0.2
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, B, A/Y, B/Z)
Output Leakage Current (Y, Z) (Full
Duplex Versions Only)
Output Leakage Current (Y, Z)
in Shutdown Mode (Full Duplex)
Driver Short-Circuit Current,
VO = High or Low
Receiver Differential Threshold
Voltage
VIH
VIL
VHYS
IIN1
IIN2
IIN3
IIN4
IOSD1
DE, DI, RE
DE, DI, RE
DE, DI, RE
DE = 0V, VCC = 0V or 5.5V VIN = 12V
VIN = -7V
RE = 0V, DE = 0V, VCC = 0V VIN = 12V
or 5.5V
VIN = -7V
RE = VCC, DE = 0V, VCC = VIN = 12V
0V or 5.5V
VIN = -7V
DE = VCC, -7V ≤ VY or VZ ≤ 12V (Note 6)
VTH -7V ≤ VCM ≤ 12V
Full 2
Full -
25 -
Full -2
Full -
Full -75
Full -
Full -40
Full -
Full -20
Full -
- -V
- 0.8 V
100 - mV
- 2 μA
70 125 μA
55 - μA
1 40 μA
-9 - μA
1 20 μA
-9 - μA
- ±250 mA
Full -200 -90 -50 mV
5 FN6363.0
December 14, 2006
5 Page 
ISL3150E, ISL3152E, ISL3153E, ISL3155E, ISL3156E, ISL3158E
Application Information
RS-485 and RS-422 are differential (balanced) data
transmission standards used for long haul or noisy
environments. RS-422 is a subset of RS-485, so RS-485
transceivers are also RS-422 compliant. RS-422 is a point-
to-multipoint (multidrop) standard, which allows only one
driver and up to 10 (assuming one unit load devices)
receivers on each bus. RS-485 is a true multipoint standard,
which allows up to 32 one unit load devices (any
combination of drivers and receivers) on each bus. To allow
for multipoint operation, the RS-485 spec requires that
drivers must handle bus contention without sustaining any
damage.
Another important advantage of RS-485 is the extended
common mode range (CMR), which specifies that the driver
outputs and receiver inputs withstand signals that range from
+12V to -7V. RS-422 and RS-485 are intended for runs as
long as 4000’, so the wide CMR is necessary to handle
ground potential differences, as well as voltages induced in
the cable by external fields.
Receiver (Rx) Features
These devices utilize a differential input receiver for maximum
noise immunity and common mode rejection. Input sensitivity
is better than ±200mV, as required by the RS-422 and RS-485
specifications.
Rx outputs feature high drive levels - typically 28mA @
VOL = 1V (to ease the design of optically coupled isolated
interfaces).
Receiver input resistance of 96kΩ surpasses the RS-422
spec of 4kΩ, and is eight times the RS-485 “Unit Load (UL)”
requirement of 12kΩ minimum. Thus, these products are
known as “one-eighth UL” transceivers, and there can be up
to 256 of these devices on a network while still complying
with the RS-485 loading spec.
Rx inputs function with common mode voltages as great as
±7V outside the power supplies (i.e., +12V and -7V), making
them ideal for long networks where induced voltages are a
realistic concern.
All the receivers include a “full fail-safe” function that
guarantees a high level receiver output if the receiver inputs
are unconnected (floating), shorted together, or connected to
a terminated bus with all the transmitters disabled.
Receivers easily meet the data rates supported by the
corresponding driver, and all receiver outputs are three-
statable via the active low RE input.
Driver (Tx) Features
The RS-485/422 driver is a differential output device that
delivers at least 2.4V across a 54Ω load (RS-485), and at
least 2.8V across a 100Ω load (RS-422). The drivers feature
low propagation delay skew to maximize bit width, and to
minimize EMI, and all drivers are three-statable via the
active high DE input.
The 115kbps and 1Mbps driver outputs are slew rate limited
to minimize EMI, and to minimize reflections in unterminated
or improperly terminated networks. Outputs of the
ISL3156Eand ISL3158E drivers are not limited, so faster
output transition times allow data rates of at least 20Mbps
High VOD Improves Noise Immunity and Flexibility
The ISL315XE driver design delivers larger differential
output voltages (VOD) than the RS-485 standard requires, or
than most RS-485 transmitters can deliver. The minimum
±2.4V VOD guarantees at least ±900mV more noise
immunity than networks built using standard 1.5V VOD
transmitters.
Another advantage of the large VOD is the ability to drive
more than two bus terminations, which allows for utilizing the
ISL315XE in “star” and other multi-terminated, “non-
standard” network topologies. Figure 8, details the
transmitter’s VOD vs. IOUT characteristic, and includes load
lines for six (20Ω) and eight (15Ω) 120Ω terminations. The
figure shows that the driver typically delivers 1.65/1.5V into
6/8 terminations, even at the worst case temperature of
+85°C.The RS-485 standard requires a minimum 1.5V VOD
into two terminations, but the ISL315XE delivers RS-485
voltage levels with 3X to 4X the number of terminations.
Hot Plug Function
When a piece of equipment powers up, there is a period of
time where the processor or ASIC driving the RS-485 control
lines (DE, RE) is unable to ensure that the RS-485 Tx and
Rx outputs are kept disabled. If the equipment is connected
to the bus, a driver activating prematurely during power up
may crash the bus. To avoid this scenario, the ISL315XE
devices incorporate a “Hot Plug” function. Circuitry monitoring
VCC ensures that, during power up and power down, the Tx
and Rx outputs remain disabled, regardless of the state of DE
and RE, if VCC is less than ~3.4V. This gives the
processor/ASIC a chance to stabilize and drive the RS-485
control lines to the proper states.
VCC
5
2.5
A/Y
0
RO
3.5V
3.3V
ISL315XE
ISL315XE
DE, DI = VCC
RE = GND 5
2.5
0
RL = 1kΩ
5
RL = 1kΩ
2.5
0
TIME (40μs/DIV)
FIGURE 7. HOT PLUG PERFORMANCE (ISL315XE) vs
ISL83088E WITHOUT HOT PLUG CIRCUITRY
11 FN6363.0
December 14, 2006
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ISL3158E.PDF ] | |
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