ETC1 IL3222 Fractional load rs485 and rs422 transceiver Datasheet

IL3285 IL3222
Fractional Load RS485 and RS422 Transceivers
Functional Diagram
Features
•
•
•
•
•
•
•
•
•
•
•
3.3 V Input Supply Compatible
2500 VRMS Isolation (1 min)
40 ns Propagation Delay
5 ns Pulse Skew
20 kV/µs Transient Immunity
Thermal Shutdown Protection
-40°C to +85°C Temperature Range
16 Pin SOIC Package
UL1577 Approval Pending
IEC 61010-1 Approval Pending
+15 kV ESD Protection
Applications
•
•
•
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High Node Count Networks
Security Networks
Building Environmental Controls
Industrial Control Networks
Gaming Systems
Factory Automation
Description
Truth Table.
VID (A-B)
DE
RE
R
D
Mode
= 200 mV
L
L
H
C
Receive
= -200 mV
L
L
L
X
Receive
-7<VID<12
X
H
Z
X
Receive/Drive
= 1.5 V
H
L
H
H
Drive
= -1.5 V
H
L
L
L
Drive
Selection Table.
Model
Half / Full
Duplex
No. of devices
allowed on bus
Data Rate
Mb/s
Fail-safe
IL3285
IL3222
half
full
256
256
1
1
yes
yes
Isoloop® is a registered trademark of NVE Corporation.
*U.S. Patent number 5,831,426; 6,300,617 and others.
ISB-DS-001-IL612-A, January 20, 2005
The IL3000 series are galvanically isolated, differential bus
transceivers designed for bidirectional data communication on
balanced transmission lines. Isolation is achieved through
patented* Isoloop® technology. The IL3285 and IL3222 offer
an exceptional 2.3 V differential output into a 54 Ω load,
which allows better data integrity over longer cable lengths.
These devices are also compatible with 3.3 V input supplies,
allowing interface to standard microcontrollers without the
need for additional level-shifting components.
The IL3000 series have current limiting and thermal shutdown
features to protect against output short circuits and bus
contention situations which may cause excessive power
dissipation. The receivers also incorporate a “sail-safe if
open” design which ensures a logic high on R if the bus lines
are disconnected or “floating”.
NVE Corp., 11409 Valley View Road, Eden Prairie, MN 55344-3617, U.S.A.
Telephone: 952-829-9217, Fax 952-829-9189, www.isoloop.com
© 2005 NVE Corporation
IL3285 IL3222
Absolute Maximum Ratings
Parameters
Storage Temperature
Ambient Operating Temperature
Voltage Range at A or B Bus Pins
Supply Voltage (1)
Digital Input Voltage
Digital Output Voltage
ESD Protection IL3285
IL3222
Symbol
TS
TA
VDD1, VDD2
Min.
-65
-40
-7
-0.5
-0.5
-0.5
+15
+7
Typ.
Max.
150
100
12
7
VDD+0.5
VDD+1
Units
°C
°C
V
V
V
V
kV
kV
Test Conditions
Min.
3.0
4.5
Typ.
Max.
5.5
5.5
12
-7
Units
V
Test Conditions
Recommended Operating Conditions
Parameters
Supply Voltage
Symbol
VDD1
VDD2
VI
VIC
IIH
Input Voltage at any Bus Terminal
(separately or common mode)
High-Level Digital Input Current
-8
+12/-7
-60
8
mA
mA
mA
mA
V
mA
mA
IOL
IOL
-60
-8
60
8
mA
mA
TA
tIR,tIF
-40
85
10
°C
µs
Symbol
Min.
8.077
Max.
Units
Low-Level Digital Input Current
IIH
Differential Input Voltage (2)
High-Level Output Current (Driver)
High-Level Digital Output Current
(Receiver)
Low-Level Output Current (Driver)
Low-Level Digital Output Current
(Receiver)
Ambient Operating Temperature
Digital Input Signal Rise and Fall
Times
VID
IOH
IOH
10
10
-10
-10
V
VDD1= 3.3 V
VDD1= 5.0 V
VDD1= 3.3 V
VDD1= 5.0 V
Insulation Specifications
Parameters
Creepage Distance (external)
Barrier Impedance
Ω || pC
Leakage Current
Typ.
>1014||7
0.2
µARMS
Test Conditions
240 VRMS, 60 Hz
Safety & Approvals
IEC61010-1
TUV Certificate Numbers:
Approval Pending
Classification as Table 1.
Model
IL3285, IL3222
Pollution
Degree
II
Max.
Working
Voltage
300 VRMS
Material
Group
III
Package Type
16-SOIC
(0.3”)
UL 1577
Rated 2500 VRMS for 1 minute
Component Recognition program. File #:
Approval Pending
2
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax (952) 829-9189
Internet: www.isoloop.com
IL3285 IL3222
Pin Connections
1
VDD1
Input Power Supply
2
GND1
Input Power Supply Ground Return
3
R
4
RE
Output Data from Bus
Read Data Enable (if RE is high, R= high
impedance)
5
DE
Drive Enable
6
COIL
Supply voltage side of coils for DE and D
7
D
8
GND1
Input Power Supply Ground Return
Data Input to Bus
9
GND2
Output Power Supply Ground Return
10
NC
11
VDD2
No Internal Connection
12
A
Noninverting bus line
13
B
Inverting bus line
14
NC
15
GND2
Output Power Supply Ground Return
16
VCOIL
Supply voltage side of coil for R
1
VDD1
Input Power Supply
2
GND1
Input Power Supply Ground Return
3
R
4
RE
Read Data Enable (if RE is high, R= high
impedance)
5
DE
Drive Enable
6
COIL
7
D
8
GND1
Input Power Supply Ground Return
9
GND2
Output Power Supply Ground Return
10
Y
11
VDD2
12
Z
Inverting driver bus line
13
B
Inverting receiver bus line
14
A
Noninverting receiver bus line
15
GND2
Output Power Supply Ground Return
16
VCOIL
Supply voltage side of coil for R
Output Power Supply
IL3285
No Internal Connection
Output Data from Bus
Supply voltage side of coils for DE and D
Data Input to Bus
Noninverting driver bus line
Output Power Supply
IL3222
Electrostatic Discharge Sensitivity
This product has been tested for electrostatic sensitivity to the limits stated in the specifications. However, NVE recommends that
all integrated circuits be handled with appropriate care to avoid damage. Damage caused by inappropriate handling or storage
could range from performance degradation to complete failure.
3
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax (952) 829-9189
Internet: www.isoloop.com
IL3285 IL3222
Driver Section
Electrical Specifications are Tmin to Tmax unless otherwise stated.
Parameters
Symbol
Min.
Output voltage
Differential Output Voltage
|VOD1|
Differential Output Voltage(6)
VOD3
1.5
Change in Magnitude of (7) Differential
∆|VOD|
Output Voltage
VOC
Common Mode Output Voltage
VOC
Change in Magnitude of (7) Common
∆|VOC|
Mode Output Voltage
Output Current(4)
High Level Input Current
Low Level Input Current
|Short-circuit Output Current |
Supply Current (VDD2 = +5V)
IIH
IIL
IOS
IDD2
Supply Current
IDD1
IDD1
(VDD1 = +5V)
(VDD2 = +3.3V)
Parameters
Maximum Data Rate
Differential Output Prop Delay
Pulse Skew(10)
Differential Output Rise & Fall Time
Output Enable Time To High Level
Output Enable Time To Low Level
Output Disable Time From High Level
Output Disable Time From Low Level
Skew Limit(3)
Symbol
tD(OD)
tSK(P)
tT(OD)
tPZH
tPZL
tPHZ
tPLZ
tSK(LIM)
Typ.
2.3
60
4
2
1.4
Switching Specifications
Min.
Typ.
5
40
6
12
25
25
25
25
12
Max.
VDD
VDD
5
±0.2
Units
V
V
V
V
3
±0.2
V
V
1
-0.8
2
10
250
7
mA
mA
mA
mA
mA
3
2
mA
mA
Max.
Units
Mbps
ns
ns
ns
ns
ns
ns
ns
ns
65
20
25
80
80
80
80
40
Test Conditions
Io = 0
IO = 0
RL = 54 Ω, VDD = 5 V
RL = 54 Ω or 100 Ω
RL = 54 Ω or 100 Ω
RL = 54 Ω or 100 Ω
Output Disabled,
VO = 12
-7 V < VO <12 V
No Load (Outputs
Enabled)
Test Conditions
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50 pF
RL = 54 Ω, CL = 50pF
Notes: These notes apply to both driver and receiver sections.
1.
2.
3.
4.
All Voltage values are with respect to network ground except differential I/O bus voltages.
Differential input/output voltage is measured at the noninverting terminal A with respect to the inverting terminal B.
Skew limit is the maximum difference in any two channels in one device.
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 VDD!,VDD2 = 5 V or VDD!= 3.3 V and TA = 25°C.
6. While –7 V<VCM>12 V, the minimum VOD2 with a 54 Ω load is either ½ VOD1 or 2.3 V, whichever is greater.
7. D|VOD| and D|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 10 ns read enable time. Maximum propagation delay is 25 ns after read assertion.
10. Pulse skew is defined as the |tPLH -tPHLl| of each channel.
4
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax (952) 829-9189
Internet: www.isoloop.com
IL3285 IL3222
Receiver Section
Electrical Specifications are Tmin to Tmax unless otherwise stated.
Parameters
Symbol
Min.
Positive-going Input Threshold
VIT+
Voltage
Negative-going Input Threshold
VIT–0.2
Voltage
Hysteresis Voltage (Vit+ - Vit-)
VHYS
Typ.
Units
V
Test Conditions
-7 V < VCM < 12 V
V
-7 V < VCM < 12 V
70
mV
VDD
V
VCM =0V, T=25°C
VID = 200 mV
IOH = -20 mA
VID = -200 mV
IOL = 20mA
High Level Digital Output Voltage
VOH
Low Level Digital Output Voltage
VOL
0.2
V
High-impedance-state output current
Line Input Current(8)
IOZ
II
1
1
-0.8
µA
mA
Input Resistance
Supply Current (VDD2 = +5V)
Supply Current (VDD1 = +5V)
Supply Current (VDD1 = +3.3V)
rI
IDD2
IDD1
IDD1
Parameters
Maximum Data Rate
Propagation Delay(9)
Pulse Skew(10)
VDD – 0.2
Max.
0.2
96
4
2
1.4
Switching Characteristics @ 5 V
Symbol
Min.
Typ.
1
tPD
100
tSK(P)
Skew Limit(3)
Output Enable Time To High Level
Output Enable Time To Low Level
Output Disable Time From High Level
Output Disable Time From Low Level
Parameters
Maximum Data Rate
Propagation Delay(9)
Pulse Skew(10)
Skew Limit(3)
Output Enable Time To High Level
Output Enable Time To Low Level
Output Disable Time From High Level
Output Disable Time From Low Level
4
tSK(LIM)
8
tPZH
15
tPZL
15
tPHZ
15
tPLZ
15
Switching Characteristics @ 3.3 V
Symbol
Min.
Typ.
5
tPD
105
7
3
2
Max.
0.4 ≤ VO ≤ (VDD2 - 0.5) V
VI = 12 V
VI = -7 V
kΩ
mA
mA
mA
165
Units
Mbps
ns
16
ns
32
60
60
60
60
ns
ns
ns
ns
ns
Max.
170
Units
Mbps
ns
tSK(P)
4
16
ns
tSK(LIM)
tPZH
tPZL
tPHZ
tPLZ
8
17
17
17
17
16
27
27
27
27
ns
ns
ns
ns
ns
Test Conditions
RL = 54 Ω, CL = 50 pF
-1.5 ≤ VO ≤ 1.5 V,
CL = 15 pF
-1.5 ≤ VO ≤ 1.5 V,
CL = 15 pF
RL = 54 Ω, CL = 50 pF
CL = 15 pF
CL = 15 pF
CL = 15 pF
CL = 15 pF
Test Conditions
RL = 54 Ω, CL = 50 pF
-1.5 ≤ VO ≤ 1.5 V,
CL = 15 pF
-1.5 ≤ VO ≤ 1.5 V,
CL = 15 pF
RL = 54 Ω, CL = 50 pF
CL = 15 pF
CL = 15 pF
CL = 15 pF
CL = 15 pF
5
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax (952) 829-9189
Internet: www.isoloop.com
IL3285 IL3222
Introduction
The absolute maximum current through the coil of the
IL3000 series is 25 mA DC. However, it is important to limit
input current to levels well below this in all applications.
The worst case logic threshold current is 10 mA. While
typical threshold currents are substantially less than this,
NVE recommends designing a 10 mA logic threshold
current in each application.
The IL3000 family of isolated RS485 and RS422
transceivers are based on the revolutionary IL600 family of
digital isolators. A single external resistor is used to set each
input channel’s maximum current for input voltages above
0.5 V. For additional information, view the IL600 Series
data sheet.
Figure 3 shows the response of the IL3000 Series. The GMR
bridge structure is designed such that the output of the
isolator is logic high when no field signal is present. The
output will switch to the low state with 10 mA of coil
current and the output will switch back to the high state
when the input current falls below 2 mA. This allows glitchfree interface with low slew rate signals.
Operation
The IL3000 series are current mode devices and utilize
NVE’s IL600 Series of digital isolators configured for noninverting outputs. The default state of each isolator output is
the logic high state for zero coil current. Therefore, to switch
the digital isolator output low, a logic low input signal
voltage is applied to the input coil via a current limiting
resistor. The resulting coil current switches the isolator
output low which in turn is sent to the transceiver. See
Figure 1 and Figure 2 below for typical coil connections.
Figure 3. IL3000 Series Transfer Function
Figure 1. Typical coil Connections for IL3285
To calculate the value of the protection resistor (R1)
required, use Ohm’s law as shown in the examples below. It
should be noted that we are concerned only with the
magnitude of the voltage across the coil. The absolute values
of Vin High and Vin Low are arbitrary.
Figure 2. Typical coil Connections for IL3222
Only a single resistor is required to limit the input coil to the
recommended 10 mA. This allows a wide range of input
voltages to be used since there is no semiconductor structure
on the input.
Figure 4. Series Resistor Calculation Equivalent Circuit.
6
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax (952) 829-9189
Internet: www.isoloop.com
IL3285 IL3222
DC Correctness
Example 1. In this case, Tnom = 25ºC, Vin High is 5 V, Vin
Low is 0 V, and Icoil minimum is specified as 10 mA. Total
loop resistance is
(Vin High - Vin Low) 5.0
=
Ω = 500 Ω
(R1 + Rcoil) =
Icoil
0.01
Therefore,
R1 = (500 − 55) Ω = 445 Ω
The IL3000 Series of isolated transceivers are inherently DC
stable which effectively maintains the correct output state
with respect to data input. At power up, the bus outputs will
follow the Function Table shown on Page 1. It is
recommended that the DE input is always held low during
power up to eliminate false drive data pulses from the bus.
The use of an external power supply monitor to minimize
glitches caused by slow power-up and power-down
transients is not required.
Example 2. At a maximum operating temperature of 85°C,
Tmax = 85ºC, Tnom = 25ºC, Vin High = 5 V, Vin Low = 0 V,
and nominal Rcoil = 55 Ω. At Tmax = 85ºC
Rcoil = 55 + ( Tmax − Tmin ) × TCRcoil
Application Information_______________________
Receiver Features
The receiver in these devices feature a “fail-safe if open”
function that guarantees a high level receiver output if the
receiver inputs are unconnected (floating). IL3285 receiver
outputs have tri-state capability via the active low RE input.
= 55 + (85 - 25) × 0.165 = 55 + 9.9 = 65 Ω
Therefore, the recommended series resistor is
(VinHigh - VinLow)
- Rcoil
Icoil
5-0
=
− 65 = 435 Ω
0.01
R1 =
Driver Features
The driver is device delivers at least 1.5 V across a 54 Ω
load and features low propagation delay skew to maximize
bit width and to minimize EMI. The drivers have tri-state
capability via the active high DE input.
Allowance should also be made for the temperature
coefficient of the current limiting resistor to ensure that Icoil
is 10 mA at maximum operating temperature.
Receiver Data Rate, Cables and Terminations
This devices are intended for network lengths up to 4000',
but the maximum system data rate decreases as the
transmission line length increases. Twisted pair cable should
be used in all networks since they 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.
Power Supplies
It is recommended that 47 nF ceramic capacitors be used to
decouple the power supplies. The capacitors must be placed
as close as possible to VDD for proper operation.
7
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax (952) 829-9189
Internet: www.isoloop.com
IL3285 IL3222
Package Dimensions: 0.3’’ 16- in SOIC
Ordering Information and Valid part Numbers
8
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax (952) 829-9189
Internet: www.isoloop.com
IL3285 IL3222
About NVE
An ISO 9001 Certified Company
NVE Corporation is a high technology components manufacturer having the unique capability to combine leading edge Giant
Magnetoresistive (GMR) materials with integrated circuits to make high performance electronic components. Products include
Magnetic Field Sensors, Magnetic Field Gradient Sensors (Gradiometer), Digital Magnetic Field Sensors, Digital Signal Isolators
and Isolated Bus Transceivers.
NVE is a leader in GMR research and in 1994 introduced the world’s first products using GMR material, a line of GMR magnetic
field sensors that can be used for position, magnetic media, wheel speed and current sensing.
NVE is located in Eden Prairie, Minnesota, a suburb of Minneapolis. Please visit our Web site at www.nve.com or call 952-8299217 for information on products, sales or distribution.
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax: (952) 829-9189
Internet: www.nve.com
e-mail: [email protected]
The information provided by NVE Corporation is believed to be accurate. However, no responsibility is assumed by NVE
Corporation for its use, nor for any infringement of patents, nor rights or licenses granted to third parties, which may result from
its use. No license is granted by implication, or otherwise, under any patent or patent rights of NVE Corporation. NVE
Corporation does not authorize, nor warrant, any NVE Corporation product for use in life support devices or systems or other
critical applications. The use of NVE Corporation’s products in such applications is understood to be entirely at the customer’s
own risk.
Specifications shown are subject to change without notice.
ISB-DS-001-IL3285/22-A
January 26, 2005
9
NVE Corporation
11409 Valley View Road
Eden Prairie, MN 55344-3617 USA
Telephone: (952) 829-9217
Fax (952) 829-9189
Internet: www.isoloop.com