Rhopoint Components Ltd
Tel: +44 (0) 870 608 1188 Fax: +44 (0) 870 241 2255
Germany: +49 (0) 692 199 8606 Fax: +49 (0) 692 199 8595
Email: sales@rhopointcomponents.com Website: www.rhopointcomponents.com
The IL485W is a
galvanically isolated, high-
speed differential bus
transceiver, designed for
bi-directional data
communication on
balanced transmission
lines. The IL485W uses
patented IsoLoop®
technology and is the first
isolated RS-485 interface
available in a standard 16
pin SOIC package, which
meets the ANSI Standards
EIA/TIA-422-B and
RS485.
The IL485W has current limiting and thermal shutdown features to
protect against output short circuits and bus contention situations where
these may cause excessive power dissipation.
With a 1 nsec pulse skew and 16 nsec propagation delay, the IL485W is
ideal for PROFIBUS applications. Use of DE/ISODE and IN1/OUT1
allows the IL485W to perform the handshaking operations of RTSAS
and DTSAS of PROFIBUS.
•2500 Vrms Isolation (1 min)
•25 ns Maximum Propagation Delay
•35 MBaud Data Rate
•1 ns Pulse Skew (typ.)
•Designed for Multi-point Transmission on Long Bus
Lines in Noisy Environments
•±60 mA Driver Output Capability
•Thermal Shutdown Protection
•Meets or Exceeds ANSI RS-485 and ISO 8482:1987 (E)
•-40°C to +85°C Temperature Range
•16 Pin SOIC Package
•PROFIBUS International Component Recognition
•UL1577 Approval (pending)
•IEC 61010-1 Approval (pending)
Applications
•PROFIBUS/RS485
•RS-485 Systems
•Multiple Data Point Transmission
Isolated RS485 Interface with
Handshake
IL485W
VID
(A-B) DE RE ISODE R D MODE
≥0.2V L L L HXReceive
≤-0.2V L L L L XReceive
-7<VID<12 XHXZXReceive/
Drive
≥ 1.5 HLH H H Drive
≤-1.5 HLHL L Drive
Open L L L HXReceive
H = High Level
L = Low Level
X = Irrelevant
Z = High Impedance
Function Table
Functional Diagram (IL485W)
Dimensions in mm
PROFIBUS Fault Interrogation
Rhopoint Components Ltd
Tel: +44 (0) 870 608 1188 Fax: +44 (0) 870 241 2255
Germany: +49 (0) 692 199 8606 Fax: +49 (0) 692 199 8595
Email: sales@rhopointcomponents.com Website: www.rhopointcomponents.com
Pin Configuration (IL485W)
Pin Connections (IL485W)
1VDD1 Input Power Supply
2GND1Input Power Supply Ground Return
3ROutput Data from Bus
4OUT1Output from Auxiliary Isolation
Channel
5RE Read Data Enable
(If RE is high, R = High Impedance)
6DE Drive Enable
7DData Input to Bus
8GND1Input Power Supply Ground Return
9GND2Output Power Supply Ground Return
10 ISODE Isolated DE Output for use in
Profibus applications where the state
of the drive enable node needs to be
monitored
11 IN1Input to the Auxiliary Isolation
Channel
12 A‘A’ Bus (Receive- True)
13 B‘B’ Bus (Receive - Inverse)
14 n/c No Internal Connection
15 GND2Output Power Supply Return
16 VDD2 Output Power Supply
PARAMETERS SYMBOL MIN. MAX. UNITS
Storage Temperature TS-65 150 °C
Ambient Operating Temperature TA-40 85 °C
Voltage Range at A or B Bus Pins -7 12 Volts
Supply Voltage(1) VDD1 , VDD2 -0.5 7Volts
Digital Input Voltage -0.5 5.5 Volts
Digital Output Voltage -0.5 VDD +0.1 Volts
Continuous Total (25°C) 725 mWatts
Power Dissipation (85°C) 377 mWatts
Maximum Output Current IO95 mA
Lead Solder Temperature (10s) 260 °C
ESD 2kV Human Body Model
Absolute Maximum Ratings
PARAMETERS CONDITION MIN. TYP. MAX. UNITS
Creepage Distance (External) 8.077 mm
Barrier Impedance >1014||7Ω||pF
Leakage Current 240V
RMS 0.2 µAmps
60Hz
Insulation Specifications
PARAMETERS SYMBOL MIN. MAX. UNITS
Supply Voltage VDD1, VDD2 4.5 5.5 Volts
Input Voltage at any bus terminal VI12
(separately or common mode) VIC -7 Volts
High-Level Digital Input Voltage VIH 3Volts
Low-Level Digital Input Voltage VIL 0.8 Volts
Differential Input Voltage (2) VID +12/ - 7 Volts
High-Level Output Current (Driver) IOH -60 mA
High-Level Digital Output Current
(Receiver) IOH 8 mA
Low-Level Output Current (Driver) IOL 60 mA
Low-Level Digital Output Current
(Receiver) IOL 8 mA
Operating Free Air Temperature TA-40 85 °C
Digital Input Signal
Rise and Fall Times tIR , tIF DC Stable
Recommended Operating Conditions
IEC61010-1
TUV Certificate Numbers: Pending
Classifications as Table 1
MODEL POLLUTION MATERIAL MAX WORKING PACKAGE TYPE
DEGREE GROUP VOLTAGE 16-SOIC (7.5mm)
IL485W II III 300V
RMS ü
UL 1577
Component Recognition Program. File # Pending
Rated 2500VRMS for 1 min.
Rhopoint Components Ltd
Tel: +44 (0) 870 608 1188 Fax: +44 (0) 870 241 2255
Germany: +49 (0) 692 199 8606 Fax: +49 (0) 692 199 8595
Email: sales@rhopointcomponents.com Website: www.rhopointcomponents.com
PARAMETERS SYMBOL MIN. TYP. (5) MAX. UNITS TEST CONDITIONS
Input Clamp Voltage VIK -1.5 VIL= -18mA
Output Voltage VO0 6 VIO= 0
Differential Output Voltage |VOD1|1.5 6VIO= 0
Differential Output Voltage (6) |VOD2|1.5 2.5 5VRL= 54Ω
Differential Output Voltage VOD3 1.5 5V Vtest = -7 to 12V
Change in Magnitude of (7)
Differential Output Voltage ∆|VOD|±0.2 VRL= 54 or 100Ω
Common Mode Output Voltage VOC 3VRL= 54 or 100Ω
-1
Change in Magnitude of (7)
Common Mode Output Voltage ∆|VOC|±0.2 VRL= 54 or 100Ω
Output Current (4) 1mA Output Disabled VO= 12
IO-0.8 mA VO= -7
High Level Input Current IIH 10 µA VI= 3.5V
Low Level Input Current IIL -10 µA VI= 0.4V
Short-Circuit Output Current -250 mA VO= -6
-150 mA VO= 0
IOS 250 mA VO= 8
Supply Current (VDD2 = +5V) IDD2 27 34 mA No Load (Outputs Enabled)
(VDD1 = +5V) IDD1 5 10 mA
Switching Characteristics
Maximum Data Rate 35 Mbd RL= 54Ω, CL= 50pF
Differential Output Delay Time tD(OD) 16 25 ns RL= 54Ω, CL= 50pF
Pulse Skew (10) tSK (P) 1 6 ns RL= 54Ω, CL= 50pF
Differential Output Transition Time tT(OD) 8 10 ns RL= 54Ω, CL= 50pF
Output Enable Time to High Level tPZH 31 65 ns RL= 54Ω, CL= 50pF
Output Enable Time to Low Level tPZL 22 35 ns RL= 54Ω, CL= 50pF
Output Disable Time from High Level tPHZ 28 50 ns RL= 54Ω, CL= 50pF
Output Disable Time from Low Level tPLZ 16 32 ns RL= 54Ω, CL= 50pF
Skew Limit (3) tSK (LIM) 2 8 ns RL= 54Ω, CL= 50pF
Driver Section Specifications
All Specifications are Tmin to Tmax unless otherwise stated
1. All Voltage values are with respect to network ground except differential
I/O bus voltages.
2. Differential input/output voltage is measured at the noninverting
terminal A/Y with respect to the inverting terminal B/Z.
3. Skew limit is the maximum difference in any two channels in one
device.
4. The power-off measurement in ANSI Standard EIA/TIA-422-B applies
to disabled outputs only and is not applied to combined inputs and outputs.
5. All typical values are at VDD1, VDD2 = 5V and TA= 25°C.
6. The minimum V
OD2 with a 100Ωload is either ½VOD1 or 2V,
whichever is greater.
7. ∆|VOD|and ∆|VOC|are the changes in magnitude of VOD and VOC,
respectively, that occur when the input is changed form one logic state to
the other.
8. This applies for both power on and power off, refer to ANSI standard
RS-485 for exact condition. The EIA/TIA-422-B limit does not apply for a
combined driver and receiver terminal.
9. Includes 8 ns read enable time. Maximum propagation delay is 25 ns
after read assertion.
10. Pulse skew is defined as the |tPLH -tPHL|of each channel.
Notes
Rhopoint Components Ltd
Tel: +44 (0) 870 608 1188 Fax: +44 (0) 870 241 2255
Germany: +49 (0) 692 199 8606 Fax: +49 (0) 692 199 8595
Email: sales@rhopointcomponents.com Website: www.rhopointcomponents.com
PARAMETERS SYMBOL MIN. TYP. (5) MAX. UNITS TEST CONDITIONS
Positive-going Input Threshold Voltage VIT+ 0.2 V VO= 2.7V, IO= -0.4mA
Negative-going Input Threshold Voltage VIT- -0.2 V VO= 0.5V, IO= 8mA
Hysteresis Voltage VIT+ VIT-Vhys 60 mV
High Level Digital Output Voltage VOH VDD -0.2 V VID = 200mV, IOH = -20µA
Low Level Digital Output Voltage VOL 0.2 V VID = -200mV, IOL = 20µA
High-Impedance-State Output Current IOZ ±20 µA VO= 0.4 to (VDD2 -0.5) V
Line Input Current (8) II1mA Other Input - 0V VI= 12V
-0.8 VI= -7V
Input Resistance rI50 kΩ
Supply Current (VDD2 = +5) IDD2 27 34 mA No Load (Outputs Enabled)
(VDD1 = +5) IDD1 510 mA
Switching Characteristics
Maximum Data Rate 35 Mbd RL= 54Ω, CL= 50pF
Propagation Time (9) tPD 24 32 ns VO= -1.5 to 1.5V, CL= 15pF
Pulse Skew (10) tSK(P) 16ns VO= -1.5 to 1.5V, CL= 15pF
Skew Limit (3) tSK(lim) 28ns RL= 54Ω, CL= 50pF
Output Enable Time to High Level tPZH 17 24 ns CL= 15pF
Output Enable Time to Low Level tPZL 30 45 ns CL= 15pF
Output Disable Time from High Level tPHZ 30 45 ns CL= 15pF
Output Disable Time from Low Level tPLZ 18 27 ns CL= 15pF
Receiver Section Specifications
All Specifications are Tmin to Tmax unless otherwise stated
