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PDF ISL3170E Data sheet ( Hoja de datos )
| Número de pieza | ISL3170E | |
| Descripción | (ISL3170E - ISL3178E) RS-485/RS-422 Transceivers | |
| Fabricantes | Intersil Corporation | |
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ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E,
® ISL3175E, ISL3176E, ISL3177E, ISL3178E
Data Sheet
August 28, 2006
FN6307.2
±15kV ESD Protected, 3.3V, Full Fail-safe,
Low Power, High Speed or Slew Rate
Limited, RS-485/RS-422 Transceivers
The Intersil ISL317XE are ±15kV IEC61000 ESD Protected,
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.
Features
• IEC61000 ESD Protection on RS-485 I/O Pins . . . . . ±15kV
- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM
• Pb-Free Plus Anneal Available (RoHS Compliant)
• 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
The ISL3170E through ISL3175E 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 ISL3170E, ISL3171E, ISL3173E, ISL3174E, ISL3176E,
ISL3177E 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.
• Current Limiting and Thermal Shutdown for driver
Overload Protection
• Tiny MSOP Packages Consume 50% Less 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
NUMBER
ISL3170E
HALF/FULL DATA RATE SLEW-RATE
DUPLEX
(Mbps)
LIMITED?
FULL
0.25
YES
HOT
PLUG?
YES
# DEVICES
ON BUS
256
RX/TX
ENABLE?
YES
QUIESCENT
ICC (μA)
510
LOW POWER
SHUTDOWN?
YES
PIN
COUNT
10, 14
ISL3171E
FULL
0.25
YES
YES
256
NO
510
NO 8
ISL3172E
HALF
0.25
YES
YES
256
YES
510
YES
8
ISL3173E
FULL
0.5
YES
YES
256
YES
510
YES
10, 14
ISL3174E
FULL
0.5
YES
YES
256
NO
510
NO 8
ISL3175E
HALF
0.5
YES
YES
256
YES
510
YES
8
ISL3176E
FULL
20
NO
YES
256
YES
510
YES
10, 14
ISL3177E
FULL
20
NO
YES
256
NO
510
NO 8
ISL3178E
HALF
20
NO
YES
256
YES
510
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. 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E, ISL3175E, ISL3176E, ISL3177E, ISL3178E
Absolute Maximum Ratings
VCC to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, DE, RE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7V
Input/Output Voltages
A, B, Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -8V 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
10 Ld MSOP Package . . . . . . . . . . . . . . . . . . . . . . . +190
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
ΔVOD
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
ΔVOC
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
ΔVTH
VOH
VCM = 0V
IO = -4mA, VID = -50mV
25 - 15
Full VCC - 0.6 -
- mV
-V
5 FN6307.2
August 28, 2006
5 Page 
ISL3170E, ISL3171E, ISL3172E, ISL3173E, ISL3174E, ISL3175E, ISL3176E, ISL3177E, ISL3178E
Receivers easily meet the data rates supported by the
corresponding driver, and all receiver outputs - except on the
ISL3171E, ISL3174E and ISL3177E- 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 ISL3171E, ISL3174E and ISL3177E.
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 ISL3176E - ISL3178E 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 ISL317XE
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 and ±15kV
IEC61000. 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, 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 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 ISL317XE RS-485 pins withstand
±15kV 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 ±8kV. The ISL317XE survive ±8kV contact
discharges on the RS-485 pins.
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.
11 FN6307.2
August 28, 2006
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ISL3170E.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ISL3170E | (ISL3170E - ISL3178E) RS-485/RS-422 Transceivers | Intersil Corporation |
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