UM3089E [UNIONSEMI]
±15kV ESD-Protected, Fail-Safe, Hot-Swappable Auto Polarity Reversal RS-485 Transceivers;
| 型号： | UM3089E |
| 厂家： | 
Union Semiconductor, Inc. |
| 描述： | ±15kV ESD-Protected, Fail-Safe, Hot-Swappable Auto Polarity Reversal RS-485 Transceivers |
| 文件： | 总14页 (文件大小：764K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UM3089E
±15kV ESD-Protected, Fail-Safe, Hot-Swappable
Auto Polarity Reversal RS-485 Transceivers
UM3089E SOP14
General Description
The UM3089E series are +5.0V powered, ±15kV ESD protected, fail-safe, hot-swappable, auto
polarity reversal RS-485 transceivers. The device includes fail-safe circuitry, which guarantees a
logic-high receiver output when the receiver inputs are open, shorted or idle. This means that the
receiver output will be logic high if all transmitters on a terminated bus are disabled (high
impedance). The UM3089E features reduced slew-rate driver that minimizes EMI and reduces
reflections caused by improperly terminated cables, allowing error-free data transmission up to
500kbps. All transmitter outputs and receiver inputs are protected to ±15kV using the Human
Body Model and IEC61000-4-2, Air-Gap Discharge.
The UM3089E includes cable auto-invert functions that reverse the polarity of the RS485 bus pins
in case the cable is misconnected. Receiver’s full fail-safe features are maintained even when the
receiver polarity has been reversed.
The transceivers typically draw 300μA of supply current when unloaded, or when fully loaded
with the drivers disabled, and 1μA of supply current when shutdown. The device has a
1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus and is
intended for half-duplex communications. The device also has over current protection and thermal
shutdown protection.
Applications
Features
Air-Condition, Building Lighting and
Automatic Polarity Reversal RS-485
Transceivers
Environmental Control Systems
Industrial-Control Local Area
Networks
PROFIBUS® and Other RS-485 Based
Field Bus Networks
High Node Count RS-485 Systems
Transceivers for EMI-Sensitive
Applications
Smart Meters/Automated Meter
Reading Systems
1μA shutdown current and 300uA receiver
current
True Fail-Safe Receiver and Hot-Swappable
Enhanced Slew-Rate Limiting
Allows up to 256 Transceivers on the Bus
Thermal Shutdown
Current-Limiting for Driver Overload
Protection.
ESD Protection for RS-485 I/O Pins
±15kV—IEC61000-4-2, Air-Gap Discharge
±8kV—IEC61000-4-2, Contact Discharge
Pin Configurations
Top View
14 13 12 11
10
9
8
1
14
13
NC
VCC
NC
L2
2
RO
UM3089EESD
XX
3
12
11
10
9
RE
4
DE
L1
5
DI
NC
NC
NC
6
NC
1
2
3
4
5
6
7
8
7
GND
XX: Week Code
Ordering Information
Part Number
Marking Code
Package Type
Shipping Qty
2500pcs/13 Inch Tape & Reel
UM3089EESD
UM3089EESD
SOP14
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UM3089E
Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
V
VCC
Supply Voltage
Control Input Voltage (/RE, DE)
Driver Input Voltage (DI)
+7
-0.3V to (VCC + 0.3V)
-0.3V to (VCC + 0.3V)
-7.5 to +12.5
V
V
Driver Output Voltage (L1, L2)
Receiver Input Voltage (L1, L2)
Receiver Output Voltage (RO)
Ambient Temperature
V
-7.5 to +12.5
V
-0.3V to (VCC + 0.3V)
-40 to +85
V
TA
TSTG
TL
°C
°C
°C
Storage Temperature Range
Lead Temperature for Soldering 10 seconds
-65 to +160
+300
DC Electrical Characteristics
(VCC = +5V ± 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V
and TA = +25°C.) (Note 1)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
SUPPLY CURRENT
DE
/RE=0V or VCC
DE 0V,
/RE=0V
= VCC
,
0.3
0.25
0.002
No load,
DI = GND
or VCC
ICC
Supply Current
mA
µA
=
Supply Current in Shutdown
Mode
ISHDN
DE = GND, /RE= VCC
10
LOGIC
VIH1
VIL1
Input High Voltage
DE, DI, /RE
DE, DI, /RE
2.0
V
V
Input Low Voltage
0.4
5
VHYS
DI Input Hysteresis
DRIVER
300
2.2
mV
VOD1
VOD2
Differential Driver Output
No Load, Figure 2
4.9
2.0
V
V
Differential Driver Output
Figure
2
,
RL=
54Ω
Change-in-Magnitude of
Differential Output Voltage
Figure
2
,
RL
=
54Ω;
ΔVOD
VOC
0.1
2.5
0.1
V
V
(Note 2)
Driver Common-Mode
Output Voltage
2.2
Figure
2
,
RL
=
54Ω
Change-in-Magnitude of
Common-Mode Voltage
Figure 2, RL
=
54Ω;
ΔVOC
V
(Note 2)
VOUT = -7V
VOUT = 12V
-250
250
Driver Short-Circuit Output
Current (Note 3)
IOSD
mA
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UM3089E
DC Electrical Characteristics (Continued)
(VCC = +5V ± 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC= +5V and
TA = +25°C.) (Note 1)
Parameter
Symbol
Test Conditions
Min
Typ
Max Unit
RECEIVER
Receiver Differential
Threshold Voltage
VTH
-7V≤VCM≤12V
-200
-50
mV
Receiver Input Hysteresis
Receiver Input Resistance
VCM=0V
25
mV
Δ
VTH
RIN
-7V≤VCM≤12V
96
kΩ
0.1
1.0
VIN
VIN
=
=
12V
-7V
DE
VCC
=
GND,
IIN2
Input Current (L1 and L2)
mA
= GND
or 5V
0.08
-0.8
VOH
VOL
IO
IO
=
-1.5mA, VID
2.5mA, VID
=
200mV
200mV
Receiver Output High Voltage
Receiver Output Low Voltage
VCC -1.5
V
V
=
=
0.4
±1
Three-State Output Current at
Receiver
IOZR
0V ≤ VO ≤ VCC
0V≤VRO ≤VCC
µA
Receiver Output Short Circuit
Current
IOSR
±8
±60
mA
Thermal Shutdown
Temperature
TSHDN
140
20
°C
°C
Thermal Shutdown Hystersis
△TSHDN
ESD Protection
Human Body Model
±15
±15
IEC61000-4-2 Air-Gap
Discharge
ESD Protection for L1, L2
kV
IEC61000-4-2 Contact
Discharge
±8
Note 1: All currents into the device are positive; all currents out of the device are negative. All
voltages are referred to device ground unless otherwise noted.
Note 2: ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes
state.
Note 3: Maximum current level applies to peak current just prior to fold back current limiting;
minimum current level applies during current limiting.
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UM3089E
Switching Characteristics
(VCC = +5V ± 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V
and TA = +25°C.)
Parameter
Symbol
Test Conditions
Min Typ
Max
Unit
fMAX
Maximum Data Rate
500
kbps
tDPLH
tDPHL
50
50
100
100
200
200
Figures
3
3
and 7, RDIFF
= 54Ω,
Driver Input-to-Output
Driver Output Skew
ns
CL1
=
CL2 100pF
=
Figures
and
CL2
and
CL2
7
,
=
RDIFF
100pF
=
54Ω,
54Ω,
tDSKEW
tDR, tDF
3
100
500
ns
ns
| tDPLH - tDPHL
|
CL1
=
Figures
3
7
,
=
RDIFF
100pF
=
Driver Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
100
200
CL1
=
Figures
4
and
8
, CL
=
100pF,
tDZH
100
2500
ns
S2 closed
Figures
Figures
Figures
4
and , CL
8
=
100pF,
15pF,
15pF,
tDZL
tDLZ
tDHZ
100
50
2500
100
ns
ns
ns
S1 closed
and , CL
S1 closed
and , CL
S2 closed
2.0V;
4
8
=
Driver Disable Time from
Low
4
8
=
Driver Disable Time from
High
50
100
tRPLH
tRPHL
,
V
|
| ≥
ID
Receiver Input to Output
100
4
200
30
ns
ns
ns
rise and fall time of VID
15ns
≤
Differential
Receiver Skew
Figures
rise and fall time of VID
6
and 9;
V
2.0V;
| ≥
|
ID
tRSKD
1
5ns
≤
| tRPLH - tRPHL
|
Figures
Figures
5
5
and 10, CL
S1 closed
=
100pF,
Receiver Enable to Output
Low
tRZL
tRZH
tRLZ
tRHZ
tSHDN
20
200
and 10, CL
S2 closed
=
=
=
100pF,
100pF,
100pF,
Receiver Enable to Output
High
20
20
200
200
ns
ns
Figures 5 and 10, CL
S1 closed
Receiver Disable Time from
Low
Figures
5
and 10, CL
S2 closed
Receiver Disable Time from
High
20
200
600
ns
ns
ns
Time to Shutdown
(Note
and
S2 closed
and , CL
4
)
50
200
Figures
Figures
4
8
, CL
=
=
=
=
15pF,
Driver Enable from
Shutdown to Output High
tDZH(SHDN)
4500
4
8
15pF,
Driver Enable from
Shutdown to Output Low
tDZL(SHDN)
tRZH(SHDN)
tRZL(SHDN)
4500
3500
3500
ns
ns
ns
S1 closed
Receiver Enable from
Shutdown to Output High
Figures
Figures
5
and 10, CL
S2 closed
100pF,
100pF,
Receiver Enable from
Shutdown to Output Low
5
and 10, CL
S1 closed
Note 4: The device is put into shutdown by bringing /RE high and DE low. If the enable inputs are
in this state for less than 50ns, the device is guaranteed not to enter shutdown. If the enable inputs
are in this state for at least 600ns, the device is guaranteed to have entered shutdown.
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UM3089E
Non-Polarity Features
The Polarities of driver and receiver are always kept the same status. When DE=/RE=LOGIC 0
and RO is standing LOGIC 0 for TS time, the polarities will be reversed automatically.
Parameter
Symbol
Test Conditions
Min Typ Max Unit
150 200 250 ms
Waiting Time for Inverting
Ts
DE=/RE=L, RO keeps L
Pin Description
Pin Number
Symbol
NC
Function
1
2
Not Connected.
Receiver Output.
RO
Receiver Enable. Drive /RE low to enable receivers, RO is high
impedance when /RE is high. Drive /RE high and DE low to enter
low-power shutdown mode.
Driver Enable. Drive DE high to enable drivers. The outputs are
high impedance when DE is low. Drive /RE high and DE low to
enter low-power shutdown mode.
3
4
/RE
DE
5
6
DI
NC
Driver Input
Not Connected.
Ground
7
GND
NC
8
Not Connected.
Not Connected.
Not Connected.
9
NC
10
NC
RS485 Receiver Input and Driver Output Pin. Normally L2 is
non-inverting bus I/O for transceiver (referred as A in
traditional RS485 transceiver) and L1 is inverting bus I/O for
transceiver (referred as B in traditional RS485 transceiver).
Under polarity reversal status, L2 becomes inverting bus I/O
and L1 becomes non-inverting bus I/O.
11
L1
12
L2
13
14
NC
Not Connected.
VCC
Power Supply for RS-485 Transceiver
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UM3089E
RS-485 Communication Function Table
Table1. Transmitting
INPUTS
OUTPUTS
/RE
X
X
L
H
DE
H
H
L/O
L/O
DI
H/O
L
X
X
A
H
L
Z
B
L
H
Z
Shutdown
Table2. Receiving
INPUTS
OUTPUTS
/RE
L
L
L
H
DE
X
X
X
H
VID=VA-VB
≥-50mV
≤-200mV
Open/Shorted
X
RO
H
L
H
Z
H
L
X
Shutdown
H: High, L: Low, X: Do not care, Z: High impedance.
VA: Input Voltage of RS485 Non-Inverting Bus I/O terminal,
VB: Input Voltage of RS485 Inverting Bus I/O terminal.
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UM3089E
Typical Operating Characteristics
(VCC=5V, driver output and receiver output no load, unless otherwise noted.)
RLOAD=5kΩ
RLOAD=54Ω
RLOAD=5kΩ
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UM3089E
TS
RLOAD=54Ω
RLOAD=54Ω
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UM3089E
Typical Operating Circuit
120ohm
120ohm
DE
L1
L1
L2
B
A
DI
D
D
DI
L2
DE
L1
D
L2
L1
D
L2
RO
RE
R
RO
RE
R
Master Node
Terminal Slave Node
R
R
+5V
GND
DI
DE
RO RE
DI
DE
RO RE
All UM3089E's L1 L2 pin can interchange each other;
Slave Node1
Slave Node N
Figure 1. Typical Half-Duplex Non-Polarity RS-485 Network
Test Circuit
L1
3V
DE
CL2
RLOAD/2
L2
DI
RDIFF
VOD2
VOD
L1
CL1
VOC
RLOAD/2
L2
Figure 2. Driver DC Test Load
Figure 3. Driver Timing Test Circuit
1K
Test Point
+
Receive
Output
VCC
VCC
500ohm
S1
S1
S2
Driver Output
Under Test
CRL
15pF
1K
+
CL
S2
Figure 4. Driver Enable/Disable Timing Test Load
Figure 5. Receiver Enable/Disable Timing Test Load
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UM3089E
L1
L2
Receiver
Output
ATE
R
VD
Figure 6. Receiver Propagation Delay Test Circuit
5V
5V
1.5V
VO
1.5V
tDPHL
DI
L1
0V
1.5V
1.5V
tDPLH
DE
L1
0V
tDZL(SHDN), tDZL
1/2VO
1/2VO
VOH
tDLZ
L2
2.3V
Output Normally Low
VOL+0.5V
VOH-0.5V
VOL
VOH
VO
0V
90%
90%
VDIFF =VL1 - VL2
tSKEW=|tDPLH-tDPHL
Output Normally High
VDIFF
|
2.3V
VOL
L2
tDHZ
10%
10%
tDZH(SHDN), tDZH
-VO
tDR
tDF
Figure 7. Driver Propagation Delays
Figure 8. Driver Enable and Disable Times
5V
RE
1.5V
1.5V
0V
VOH
VOL
tRZL(SHDN), tRZL
Output Normally Low
VOH
RO
tRLZ
OUTPUT
INPUT
1.5V
tRPLH
1.5V
tRPHL
1.5V
VOL+0.5V
VOH-0.5V
L2 1V
L1 -1V
RO
Output Normally High
1.5V
tRZH(SHDN), tRZH
VOL
tRHZ
Figure 9. Receiver Propagation Delays
Figure 10. Receiver Enable and Disable Times
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UM3089E
Detail Description
Polarity Reversal Function
With large node count RS485 network, it is common for some cable data lines to be wired
backwards during installation. When this happens, the node is unable to communicate over
network, and must be rewired to the connector, which is time consuming.
The UM3089E simplifies this task by including an automatic polarity reversal function inside.
Upon UM3089E powers up, when DE=/RE=logic low, if RO keeps logic low over a predefined
time TS (i.e TS=200ms in UM3089E), the chip reverses its bus pins’ polarity, so L1 becomes
non-inverting, and L2 becomes inverting. Otherwise, the chip operates like any standard RS485
transceiver, and the bus pins have their normal polarity definition of L2 as non-inverting pin and
L1 as inverting pin.
Union Semi’s unique automatic polarity reversal function is superior to that found on competing
devices, because the receiver’s full fail safe function is maintained, even when the RX polarity is
reversed.
Fail-Safe and Hot-Swap
The UM3089E guarantees a logic high receiver output when the receiver inputs are shorted or
open, or when they are connected to a terminated transmission line with all drivers disabled. This
is done by setting the receiver input threshold between -50mV and -200mV. If the differential
receiver input voltage VID is greater than or equal to -50mV, RO is logic high. If VID is less than
or equal to -200mV, RO is logic low. In the case of a terminated bus with all transmitters disabled,
the receiver’s differential input voltage is pulled to 0V by the termination. With the receiver
threshold of UM3089E, this results in logic high with a 50mV minimum noise margin, and this
-50mV to -200mV threshold complies with the ±200mV EIA/TIA-485 standard.
When circuit boards with RS485 transceiver are inserted into a hot or powered backplane,
differential disturbances to the data bus can lead to data errors. Upon initial circuit board insertion,
the microprocessor undergoes its own power-up sequence. During this period, the processor’s
logic output drivers are high impedance and unable to drive the DE and /RE inputs of these
devices to a defined logic level. Leakage currents up to ±10μA from the high impedance state of
processor’s logic drivers could cause standard CMOS enable inputs of a transceiver to drift to an
incorrect logic level. Additionally, parasitic circuit board capacitance could cause coupling of VCC
or GND to the enable inputs. Without the hot-swap capability, these facts could improperly enable
the transceiver’s driver or receiver.
When VCC rises, an internal pull down circuit holds DE low and /RE high. After the initial power
up sequence, the pull down/pull up circuit becomes transparent, resetting the hot-swap tolerable
input. This hot-swap input circuit enhances UM3089E’s performance in harsh environment
application.
±15kV ESD Protection
All pins on UM3089E device include ESD protection structures, and the family incorporates
advanced structures which allow the RS-485 pins (L1, L2) to survive ESD events up to ±15kV.
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. The ESD structures withstand high ESD in all
states: normal operation, shutdown, and powered down. After an ESD event, circuits keep
working without latch up. The ESD protection can be tested in various ways and with reference to
the ground pin. The L1, L2 are characterized for protection to the following limits: ±15kV using
the Human Body Model and IEC61000-4-2, Air-Gap Discharge, and ±8kV Contact Discharge.
The logic pins (RO, /RE, DE, DI) are characterized for protection to the following limits: ±2kV
using the Human Body Model.
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UM3089E
Applications Information
Non-Polarity transceiver
When established the non-polarity RS-485 net, you should pay attention to two conditions. First, a
pair of bias resistance (pull-up to +5V for RS-485 A bus, push-down to GND for RS-485 B bus)
must be required, usually be built in the master node, or independently, 500Ω resistance is
recommended. The other nodes don’t need bias resistance anymore. Second, the transceiver rate
must be higher than 100bps or the maximum transmitting time for low logic should be less than
100ms.
256 Transceivers on the Bus
The standard RS-485 receiver input impedance is 12kΩ (one unit load), and the standard driver
can drive up to 32 unit loads. The Union family of transceivers have a 1/8 unit load receiver
input impedance (96kΩ), allowing up to 256 transceivers to be connected in parallel on one
communication line. Any combination of these devices and/or other RS-485 transceivers with a
total of 32 unit loads or less can be connected to the line.
Low-Power Shutdown Mode
Low-power shutdown mode is initiated by bringing both /RE high and DE low. In shutdown, the
device typically draws only 10uA of supply current. /RE and DE may be driven simultaneously;
the parts are guaranteed not to enter shutdown if /RE is high and DE is low for less than 50ns. If
the inputs are in this state for at least 600ns, the parts are guaranteed to enter shutdown. Enable
times tZH and tZL in the Switching Characteristics tables assume the part was not in a low-power
shutdown state. Enable times tZH(SHDN) and tZL(SHDN) assume the parts were shut down. It takes
drivers and receivers longer to become enabled from low-power shutdown mode (tZH(SHDN),
tZL(SHDN)) than from driver/receiver-disable mode (tZH, tZL).
Driver Output Protection
Two mechanisms prevent excessive output current and power dissipation caused by faults or by
bus contention. The first, a foldback current limit on the output stage, provides immediate
protection against short circuits over the whole common-mode voltage range (see Typical
Operating Characteristics). The second, a thermal shutdown circuit, forces the driver outputs into
a high-impedance state if the die temperature becomes excessive.
Line Length vs. Data Rate
The RS-485/RS-422 standard covers line lengths up to 4000 feet. For line lengths greater than
4000 feet, repeater is required.
Typical Applications
The UM3089E transceivers are designed for bidirectional data communications on multipoint bus
transmission lines. To minimize reflections, the line should be terminated at both ends in its
characteristic impedance, and stub lengths of the main line should be kept as short as possible.
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UM3089E
Package Information
UM3089EESD SOP14
Outline Drawing
DIMENSIONS
MILLIMETERS
INCHES
Min
Symbol
Min
Max
1.750
0.250
1.650
0.750
0.490
0.250
8.730
6.200
4.000
Max
0.069
0.010
0.066
0.030
0.020
0.010
0.349
0.244
0.160
A
A1
A2
A3
b
c
D
E
E1
e
1.350
0.100
1.250
0.550
0.360
0.170
8.530
5.800
3.800
0.053
0.004
0.050
0.022
0.014
0.006
0.341
0.228
0.152
D
L2
INDEX Ø0.8±0.1 DEP0.2±0.1
θ2
θ1
e
b
c
0.25
M
θ3
1.270BSC
0.050BSC
L
0.450
0.800
0.018
0.032
L1
L2
θ1
θ2
θ3
θ4
1.04REF
0.250BSC
0.042REF
0.010BSC
0.10
θ4
6°
10°
10°
9°
6°
10°
10°
9°
6°
5°
5°
6°
5°
5°
9°
9°
Land Pattern
0.50
NOTES:
1. Compound dimension: 8.63×3.90 ;
2. Unit: mm;
3. General tolerance ±0.05mm unless otherwise
specified;
1.27
4. The layout is just for reference.
Tape and Reel Orientation
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UM3089E
IMPORTANT NOTICE
The information in this document has been carefully reviewed and is believed to be
accurate. Nonetheless, this document is subject to change without notice. Union assumes
no responsibility for any inaccuracies that may be contained in this document, and makes
no commitment to update or to keep current the contained information, or to notify a
person or organization of any update. Union reserves the right to make changes, at any
time, in order to improve reliability, function or design and to attempt to supply the best
product possible.
Union Semiconductor, Inc
Add: 2F, Building 3, Lane 647, Songtao Road, Shanghai 201203
Tel: 021-51093966
Fax: 021-51026018
Website: www.union-ic.com
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相关型号：
UM3089EESD
±15kV ESD-Protected, Fail-Safe, Hot-Swappable Auto Polarity Reversal RS-485 Transceivers
UNIONSEMI
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