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ISL3180E Schematic ( PDF Datasheet ) - Intersil Corporation
| Teilenummer | ISL3180E |
|
| Beschreibung | RS-485/RS-422 Transceivers | |
| Hersteller | Intersil Corporation | |
| Logo |  |
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Gesamt 18 Seiten 
DATASHEET
High ESD Protected, +125°C, 40Mbps, 3.3V, Full
Fail-Safe, RS-485/RS-422 Transceivers
ISL3179E, ISL3180E
Intersil’s ISL3179E and ISL3180E are high ESD Protected (see
Table 2), 3.3V powered, single transceivers that meet both the
RS-485 and RS-422 standards for balanced communication.
Each device has low bus currents (+220µA/-150µA), so it
presents a “1/5 unit load” to the RS-485 bus. This allows up to
160 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 terminated but undriven.
The ISL3180E is configured for full duplex applications. The
ISL3179E half duplex version multiplexes the Rx inputs and Tx
outputs to allow a transceiver with an output disable function
in 8 Ld packages.
Hot plug circuitry ensures that the Tx and Rx outputs remain in
a high impedance state while the power supply stabilizes.
Applications
• Motor controller/position encoder systems
• Factory automation
• Field bus networks
• Security networks
• Building environmental control systems
• Industrial/process control networks
Features
• High ESD protection on RS-485 I/O pins
- ISL3179E. . . . . . . . . . . . . . . . . . . . . . . . . ±16.5kV IEC61000
- ISL3180E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±12kV HBM
- Class 3 HBM level on all other pins (ISL3179E) . . . . . >9kV
• Specified for +125°C operation
• High data rates. . . . . . . . . . . . . . . . . . . . . . . . . . . up to 40Mbps
• 5V tolerant logic inputs
• 1/5 unit load allows up to 160 devices on the bus
• Full fail-safe (open, shorted, terminated/undriven) receiver
• Hot plug - Tx and Rx outputs remain three-state during
power-up
• Low quiescent current . . . . . . . . . . . . . . . . . . . . . . . 4mA (max)
• Low current shutdown mode . . . . . . . . . . . . . . . . . 1µA (max)
• -7V to +12V common-mode input voltage range
• Three-state Rx and Tx outputs
• 16/16.5ns (max) Tx/Rx propagation delays; 1.5ns (max) skew
• Operates from a single +3.3V supply (10% tolerance)
• Current limiting and thermal shutdown for driver overload
protection
• Pb-free (RoHS compliant)
TABLE 1. KEY DIFFERENCES BETWEEN HIGH-SPEED INTERFACE
FAMILY OF PARTS
PART
NUMBER
FULL/HALF
DUPLEX
VCC VOD
(V) (V)
DATA RATE
(Mbps)
ISL3179E
Half 3.3 1.5
40
ISL3180E
Full 3.3 1.5
40
ISL3159E
Half 5 2.1 40
ISL3259E
Half
5 2.1
100
+3.3V
(SOIC AND MSOP PIN NUMBERS SHOWN)
+3.3V
+
0.1µF
8
1 RO
VCC
R
2 RE
B/Z 7
RT
3 DE
A/Y 6
0.1µF +
RT 7
6
8
VCC
B/Z
A/Y
D DI 4
DE 3
RE 2
4 DI D
GND
5
R
GND
5
RO 1
FIGURE 1. TYPICAL OPERATING CIRCUIT - ISL3179E
August 25, 2015
FN6365.5
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2007-2008, 2011, 2015. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
 
ISL3179E, ISL3180E
Electrical Specifications Test Conditions: VCC = 3.0V to 3.6V; Typicals are at VCC = 3.3V, TA = +25°C. Boldface limits apply across the
operating temperature range. (Note 7) (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
MIN
MAX
(°C) (Note 17) TYP (Note 17) UNIT
Receiver Output Low Voltage
Receiver Output Low Current
Three-state (high impedance)
Receiver Output Current
VOL IO = +10mA, VID = -200mV
IOL VOL = 1V, VID = -200mV
IOZR 0.4V ≤ VO ≤ 2.4V
Full - - 0.4 V
Full 25 -
- mA
Full
-1 0.015
1
µA
Receiver Input Resistance
Receiver Short-circuit Current
SUPPLY CURRENT
RIN
IOSR
-7V ≤ VCM ≤ 12V
0V ≤ VO ≤ VCC
Full 54 80 - kΩ
Full
±20
-
±110
mA
No-load Supply Current (Note 8)
Shutdown Supply Current
ESD PERFORMANCE
ICC
ISHDN
DI = DE = 0V or VCC
DE = 0V, RE = VCC, DI = 0V or VCC
Full - 2.6 4 mA
Full
- 0.05 1
µA
RS-485 Pins (A/Y, B/Z)
ISL3179E Only
IEC61000-4-2, Air-gap Discharge Method
IEC61000-4-2, Contact Discharge Method
25
- ±16.5 -
kV
25 - ±9 - kV
Human Body Model, from bus pins to GND
25
- ±16.5 -
kV
All Pins
ISL3179E Only
Human Body Model, per JEDEC
Machine Model, per JEDEC
25
- >±9 -
kV
25 - >±400 - V
RS-485 Pins (A, B, Y, Z)
ISL3180E Only
IEC61000-4-2, Air-gap Discharge Method
IEC61000-4-2, Contact Discharge Method
25 - ±4 - kV
25 - ±5 - kV
Human Body Model, from bus pins to GND
25
- ±12 -
kV
All Pins
ISL3180E Only
Human Body Model, per JEDEC
Machine Model, per JEDEC
25 - ±3 - kV
25 - ±150 - V
DRIVER SWITCHING CHARACTERISTICS
Maximum Data Rate
Driver Differential Output Delay
Prop Delay Part-to-part Skew
Driver Differential Output Skew
Driver Differential Rise or Fall Time
Driver Enable to Output High
fMAX
tDD
tSKP-P
tSKEW
tR, tF
tZH
VOD ≥ ±1.5V, RD = 54Ω, CL = 100pF (Figure 7)
RD = 54Ω, CD = 50pF (Figure 5)
RD = 54Ω, CD = 50pF (Figure 5), (Note 15)
RD = 54Ω, CD = 50pF (Figure 5)
RD = 54Ω, CD = 50pF (Figure 5)
RL = 110Ω, CL = 50pF, SW = GND (Figure 6),
(Note 10)
Full
Full
Full
Full
Full
Full
40 60
- Mbps
-
11 16
ns
- - 4 ns
- 0 1.5 ns
- 4 7 ns
-
18 25
ns
Driver Enable to Output Low
tZL RL = 110Ω, CL = 50pF, SW = VCC (Figure 6),
Full
-
16 25
ns
(Note 10)
Driver Disable from Output High
tHZ RL = 110Ω, CL = 50pF, SW = GND (Figure 6)
Full
-
15 25
ns
Driver Disable from Output Low
tLZ RL = 110Ω, CL = 50pF, SW = VCC (Figure 6)
Full
-
18 25
ns
Time to Shutdown
tSHDN (Note 12)
Full 60 - 600 ns
Driver Enable from Shutdown to
tZH(SHDN) RL = 110Ω, CL = 50pF, SW = GND (Figure 6),
Full
-
-
1000
ns
Output High
(Notes 12, 13)
Driver Enable from Shutdown to
tZL(SHDN) RL = 110Ω, CL = 50pF, SW = VCC (Figure 6),
Full
-
-
1000
ns
Output Low
(Notes 12, 13)
RECEIVER SWITCHING CHARACTERISTICS
Maximum Data Rate
Receiver Input to Output Delay
Prop Delay Part-to-part Skew
fMAX VID = ±1.5V
tPLH, tPHL Figure 8
tSKP-P Figure 8, Note 15
Full 40 60 - Mbps
Full
-
10 16.5
ns
Full - - 4 ns
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6
FN6365.5
August 25, 2015
6 Page 
ISL3179E, ISL3180E
Application Information
RS-485 and RS-422 are differential (balanced) data
transmission standards for use in 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 mix 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’ (~1200m), 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
This transceiver utilizes a differential input receiver for maximum
noise immunity and common-mode rejection. Input sensitivity is
±200mV, as required by the RS-422 and RS-485 specifications.
Receiver inputs function with common-mode voltages as great
as +9/-7V outside the power supplies
(i.e., +12V and -7V), making them ideal for long networks, or
industrial environments, where induced voltages are a realistic
concern.
The receiver input resistance of 50kΩ surpasses the RS-422
specification of 4kΩ, and is 5x the RS-485 “Unit Load” (UL)
requirement of 12kΩ minimum. Thus, the ISL3179E is known as
a “one-fifth UL” transceiver, and there can be up to 160 devices
on the RS-485 bus while still complying with the RS-485 loading
specification.
The receiver is a “full fail-safe” version 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 (terminated/undriven).
Rx outputs deliver large low state currents (typically 28mA at
VOL = 1V) to ease the design of optically coupled isolated
networks.
Receivers easily meet the 40Mbps data rate supported by the
driver, and the receiver output is tri-statable via the active low RE
input.
Driver (Tx) Features
The RS-485/RS-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.
Outputs of the drivers are not slew rate limited, so faster output
transition times allow data rates of at least 40Mbps. Driver
outputs are tri-statable via the active high DE input.
For parallel applications, bit-to-bit skews between any two
transmitter and receiver pairs are guaranteed to be no worse
than 8ns (4ns max for any two Tx, 4ns max for any two Rx).
ESD Protection
All pins on the ISL3179E include class 3 (>9kV) 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 (ISL3179E) or ±12kV HBM (ISL3180E), and
±16.5kV (ISL3179E) or ±4kV (ISL3180E) 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 the ISL3179E’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 more difficult to obtain repeatable results. The ISL3179E
RS-485 pins withstand ±16.5kV air-gap discharges, while the
ISL3180E’s RS-485 pins withstand ±4kV.
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 the ISL3179E survive ±9kV contact discharges, while the
ISL3180E’s RS-485 pins withstand ±5kV.
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 ISL3179E and ISL3180E incorporate a
Submit Document Feedback 12
FN6365.5
August 25, 2015
12 Page | ||
| Seiten | Gesamt 18 Seiten | |
| PDF Download | [ ISL3180E Schematic.PDF ] | |
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