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PDF ISL83078E Data sheet ( Hoja de datos )
| Número de pieza | ISL83078E | |
| Descripción | (ISL83070E - ISL83078E) RS-485/RS-422 Transceivers | |
| Fabricantes | Intersil Corporation | |
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ISL83070E, ISL83071E, ISL83072E, ISL83073E,
® ISL83075E, ISL83076E, ISL83077E, ISL83078E
Data Sheet
March 21, 2006
FN6115.3
±15kV ESD Protected, 3.3V, Full Fail-safe,
Low Power, High Speed or Slew Rate
Limited, RS-485/RS-422 Transceivers
The Intersil ISL8307XE are BiCMOS 3.3V powered, single
transceivers that meet both the RS-485 and RS-422
standards for balanced communication. These devices have
very low bus currents (+125µA/-100µA), 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. For example, in a remote utility meter reading
system, individual meter readings are routed to a concentrator
via an RS-485 network, so the high allowed node count
minimizes the number of repeaters required.
Receiver (Rx) inputs feature a “Full Fail-Safe” design, which
ensures a logic high Rx output if Rx inputs are floating,
shorted, or terminated but undriven.
Hot Plug circuitry ensures that the Tx and Rx outputs remain
in a high impedance state while the power supply stabilizes.
The ISL83070E through ISL83075E utilize slew rate limited
drivers which reduce EMI, and minimize reflections from
www.DataSheet4U.coimmproperly terminated transmission lines, or unterminated
stubs in multidrop and multipoint applications. Slew rate limited
versions also include receiver input filtering to enhance noise
immunity in the presence of slow input signals.
The ISL83070E, ISL83071E, ISL83073E, ISL83076E,
ISL83077E are configured for full duplex (separate Rx input
and Tx output pins) applications. The half duplex versions
multiplex the Rx inputs and Tx outputs to allow transceivers
with output disable functions in 8 lead packages.
Features
• Pb-Free Plus Anneal (RoHS Compliant)
• RS-485 I/O Pin ESD Protection . . . . . . . . . . . . . ±15kV HBM
- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM
• Full Fail-safe (Open, Short, Terminated/Floating)
Receivers
• Hot Plug - Tx and Rx Outputs Remain Three-state During
Power-up
• True 1/8 Unit Load Allows up to 256 Devices on the Bus
• Single 3.3V Supply
• High Data Rates . . . . . . . . . . . . . . . . . . . . . . up to 20Mbps
• Low Quiescent Supply Current . . . . . . . . . . .800µA (Max)
- Ultra Low Shutdown Supply Current . . . . . . . . . . .10nA
• -7V to +12V Common Mode Input/Output Voltage Range
• Half and Full Duplex Pinouts
• Three State Rx and Tx Outputs Available
• Current Limiting and Thermal Shutdown for driver
Overload Protection
• Tiny MSOP package offering saves 50% board space
Applications
• Automated Utility Meter Reading Systems
• High Node Count Systems
• Field Bus Networks
• Security Camera Networks
• Building Environmental Control/ Lighting Systems
• Industrial/Process Control Networks
TABLE 1. SUMMARY OF FEATURES
PART HALF/FULL DATA RATE SLEW-RATE HOT # DEVICES RX/TX
NUMBER DUPLEX
(Mbps)
LIMITED? PLUG? ON BUS ENABLE?
ISL83070E
FULL
0.25
YES
YES
256
YES
ISL83071E
FULL
0.25
YES
YES
256
NO
ISL83072E
HALF
0.25
YES
YES
256
YES
ISL83073E
FULL
0.5
YES
YES
256
YES
ISL83075E
HALF
0.5
YES
YES
256
YES
ISL83076E
FULL
20
NO
YES
256
YES
ISL83077E
FULL
20
NO
YES
256
NO
ISL83078E
HALF
20
NO
YES
256
YES
QUIESCENT
ICC (µA)
510
510
510
510
510
510
510
510
LOW POWER PIN
SHUTDOWN? COUNT
YES
14
NO 8
YES
8
YES
14
YES
8
YES
14
NO 8
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. 2005, 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL83070E, ISL83071E, ISL83072E, ISL83073E, ISL83075E, ISL83076E, ISL83077E, ISL83078E
Absolute Maximum Ratings
VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
Input/Output Voltages
A, B, Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -9V to +13V
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
14 Ld SOIC Package . . . . . . . . . . . . . . . . . . . . . . . .
128
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 = 3.0V to 3.6V; Unless Otherwise Specified. Typicals are at VCC = 3.3V, TA = 25°C,
Note 4
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(°C)
MIN
TYP MAX UNITS
DC CHARACTERISTICS
Driver Differential VOUT
Change in Magnitude of Driver
Differential VOUT for
Complementary Output States
VOD
∆VOD
RL = 100Ω (RS-422) (Figure 1A, Note 15)
RL = 54Ω (RS-485) (Figure 1A)
No Load
RL = 60Ω, -7V ≤ VCM ≤ 12V (Figure 1B)
RL = 54Ω or 100Ω (Figure 1A)
Full 2 2.3 - V
Full 1.5
2
VCC
V
- - VCC
Full 1.5 2.2 -
V
Full
-
0.01 0.2
V
Driver Common-Mode VOUT
Change in Magnitude of Driver
Common-Mode VOUT for
Complementary Output States
VOC
∆VOC
RL = 54Ω or 100Ω (Figure 1A)
RL = 54Ω or 100Ω (Figure 1A)
Full -
2 3V
Full
-
0.01 0.2
V
Logic Input High Voltage
Logic Input Low Voltage
Logic Input Hysteresis
Logic Input Current
Input Current (A, B, A/Y, B/Z)
Output Leakage Current (Y, Z) (Full
Duplex Versions Only, Note 12)
Output Leakage Current (Y, Z)
in Shutdown Mode (Full Duplex,
Note 12)
VIH
VIL
VHYS
IIN1
IIN2
IIN3
IIN4
DI, DE, RE
DI, DE, RE
DE, RE, (Note 14)
DI = DE = RE = 0V or VCC, Note 17
DE = 0V, VCC = 0V or
3.6V
VIN = 12V
VIN = -7V
RE = 0V, DE = 0V,
VCC = 0V or 3.6V
VIN = 12V
VIN = -7V
RE = VCC, DE = 0V,
VCC = 0V or 3.6V
VIN = 12V
VIN = -7V
Full 2
- -V
Full -
- 0.8 V
25 - 100 - mV
Full -2
- 2 µA
Full - 80 125 µA
Full -100 -50 - µA
Full - 10 40 µA
Full -40 -10 - µA
Full - 10 40 µA
Full -40 -10 - µA
Driver Short-Circuit Current,
VO = High or Low
Receiver Differential Threshold
Voltage
IOSD1 DE = VCC, -7V ≤ VY or VZ ≤ 12V (Note 6)
VTH -7V ≤ VCM ≤ 12V
Full -
- ±250 mA
Full
-200
-125 -50
mV
Receiver Input Hysteresis
Receiver Output High Voltage
∆VTH
VOH
VCM = 0V
IO = -4mA, VID = -50mV
25 - 15
Full VCC - 0.6 -
- mV
-V
5 FN6115.3
March 21, 2006
5 Page 
ISL83070E, ISL83071E, ISL83072E, ISL83073E, ISL83075E, ISL83076E, ISL83077E, ISL83078E
Receivers easily meet the data rates supported by the
corresponding driver, and all receiver outputs - except on the
ISL83071E and ISL83077E- are tri-statable via the active
low RE input.
Driver Features
The RS-485/422 driver is a differential output device that
delivers at least 1.5V across a 54Ω load (RS-485), and at
least 2V across a 100Ω load (RS-422). The drivers feature
low propagation delay skew to maximize bit width, and to
minimize EMI.
All drivers are tri-statable via the active high DE input, except
on the ISL83071E and ISL83077E.
The 250kbps and 500kbps driver outputs are slew rate
limited to minimize EMI, and to reduce reflections in
unterminated or improperly terminated networks. Outputs of
the ISL83076E - ISL83078E drivers are not limited, so faster
output transition times allow data rates of at least 20Mbps.
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 ISL8307XE
family incorporates a “Hot Plug” function. During power up,
circuitry monitoring VCC ensures that the Tx and Rx outputs
remain disabled for a period of time, regardless of the state of
DE and RE. This gives the processor/ASIC a chance to
stabilize and drive the RS-485 control lines to the proper states.
ESD Protection
All pins on these devices include 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 ±15kV HBM. The RS-485 pins are
particularly vulnerable to ESD damage 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, protect
without allowing any latchup mechanism to activate, 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.
Data Rate, Cables, and Terminations
RS-485/422 are intended for network lengths up to 4000’,
but the maximum system data rate decreases as the
transmission length increases. Devices operating at 20Mbps
are limited to lengths less than 100’, while the 250kbps
versions can operate at full data rates with lengths of several
thousand feet.
Twisted pair is the cable of choice for RS-485/422 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 20Mbps
devices, to minimize reflections. Short networks using the
250kbps versions need not be terminated, but, 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 spec requires that drivers
survive worst case bus contentions undamaged. These
devices meet this requirement via driver output short circuit
current limits, and on-chip thermal shutdown circuitry.
The driver output stages incorporate short circuit current
limiting circuitry which ensures that the output current never
exceeds the RS-485 spec, even at the common mode
voltage range extremes. Additionally, these devices utilize a
foldback circuit which reduces the short circuit current, and
thus the power dissipation, whenever the contending voltage
exceeds either supply.
In the event of a major short circuit condition, devices also
include a thermal shutdown feature that disables the drivers
whenever the die temperature becomes excessive. This
eliminates the power dissipation, allowing the die to cool. The
drivers automatically re-enable after the die temperature
drops about 15 degrees. If the contention persists, the thermal
shutdown/re-enable cycle repeats until the fault is cleared.
Receivers stay operational during thermal shutdown.
Low Power Shutdown Mode
These CMOS transceivers all use a fraction of the power
required by their bipolar counterparts, but some also include
a shutdown feature that reduces the already low quiescent
ICC to a 10nA trickle. These devices enter 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 50ns 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 7-11, at the
end of the Electrical Specification table, for more information.
11 FN6115.3
March 21, 2006
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet ISL83078E.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ISL83078E | (ISL83070E - ISL83078E) RS-485/RS-422 Transceivers | Intersil Corporation |
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