UM3085EEPA [UNIONSEMI]
ESD-Protected, Slew-Rate-Limited, Fail-Safe, True RS-485 Transceivers;
| 型号： | UM3085EEPA |
| 厂家： | 
Union Semiconductor, Inc. |
| 描述： | ESD-Protected, Slew-Rate-Limited, Fail-Safe, True RS-485 Transceivers |
| 文件： | 总12页 (文件大小：346K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
UM3085E/UM3088E
±15kV ESD-Protected, Slew-Rate-Limited, Fail-Safe,
True RS-485 Transceivers
UM3085E/UM3088E SOP8/DIP8
General Description
The UM3085E, UM3088E are ±15kV ESD-protected, high-speed transceivers for RS-485
communication that contain one driver and one receiver. These devices feature 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 UM3085E features reduced slew-rate driver that minimizes EMI
and reduces reflections caused by improperly terminated cables, allowing error-free data
transmission up to 500kbps. While partially slew-rate limited UM3088E speeds up to 2.5Mbps.
All devices feature enhanced ESD protection. All transmitter outputs and receiver inputs are
protected to ±15kV using the Human Body Model and IEC61000-4-2, Air-Gap Discharge.
The transceivers typically draw 400μA of supply current when unloaded, or when fully loaded
with the drivers disabled. All devices have a 1/8-unit-load receiver input impedance that allows up
to 256 transceivers on the bus and are intended for half-duplex communications.
Applications
Features
RS-485 Transceivers
Level Translators
Industrial-Control Local Area Networks
Transceivers for EMI-Sensitive
Applications
ESD Protection for RS-485 I/O Pins
±15kV—Human Body Model
±15kV—IEC61000-4-2, Air-Gap Discharge
True Fail-Safe Receiver while Maintaining
EIA/TIA-485 Compatibility
Enhanced Slew-Rate Limiting Facilitates
Error-Free Data Transmission
2nA Low-Current Shutdown Mode
-7V to +12V Common-Mode Input Voltage
Range
Allows up to 256 Transceivers on the Bus
Thermal Shutdown
Current-Limiting for Driver Overload
Protection
Ordering Information
Part Number
Operating
Temperature
Marking Code
Packaging Type
UM3085EESA
UM3085EEPA
UM3088EESA
UM3088EEPA
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
UM3085EESA
UM3085EEPA
UM3088EESA
UM3088EEPA
SOP8
DIP8
SOP8
DIP8
Selection Guide
Guaranteed
Driver/ Shutdown
±15kV
Part
Low-Power Slew-Rate
Transceivers
On Bus
Date Rate
Number
Receiver
Enable
Yes
Current
(nA)
ESD
Protection
Yes
Shutdown
Limited
(Mbps)
UM3085E
UM3088E
0.5
2.5
Yes
Yes
Yes
Yes
2
2
256
256
Yes
Yes
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http://www.union-ic.com Rev.05 Sep.2015 1/12
UM3085E/UM3088E
Absolute Maximum Ratings
Symbol
Parameter
Supply Voltage
Value
+7
Unit
V
VCC
______
Control Input Voltage (RE, DE)
Driver Input Voltage (DI)
-0.3V to (VCC + 0.3V)
-0.3V to (VCC + 0.3V)
-7.5 to +12.5
-7.5 to +12.5
-0.3V to (VCC + 0.3V)
-40 to +85
V
V
Driver Output Voltage (A, B)
Receiver Input Voltage (A, B)
Receiver Output Voltage (RO)
Ambient Temperature
V
V
V
TA
TSTG
TL
°C
°C
°C
Storage Temperature Range
-65 to +160
Lead Temperature for Soldering 10 seconds
+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=VCC,
RE=0V or VCC
______
0.3
mA
0.25
No Load,
DI=GND
or VCC
ICC
Supply Current
DE=0V,
______
RE=0V
______
Supply Current in Shutdown
Mode
ISHDN
0.002
2.0
10
µA
DE=GND, RE=VCC
LOGIC
______
VIH1
VIL1
Input High Voltage
DE, DI, RE
V
V
______
Input Low Voltage
DE, DI, RE
0.8
5
VHYS
DI Input Hysteresis
DRIVER
UM3085E
100
1.5
mV
Differential Driver Output
VOD1
VOD2
No Load, Figure 2
V
V
Differential Driver Output
Figure
Figure
2
2
,
,
R=50Ω
R=50Ω
Change-in-Magnitude of
Differential Output Voltage
Δ
VOD
VOC
VOC
0.2
3.0
V
V
(Note 2)
Driver Common-Mode
Output Voltage
Figure
2
,
R
=
50Ω
50Ω
Change-in-Magnitude of
Common-Mode Voltage
Figure 2,
R
=
Δ
0.2
V
(Note 2)
VOUT= -7V
VOUT=12V
-250
250
Driver Short-Circuit Output
Current (Note 3)
IOSD
mA
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UM3085E/UM3088E
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
RECEIVER
Symbol
Test Conditions
Min Typ Max Unit
Receiver Differential
Threshold Voltage
VTH
-7V≤VCM≤12V
-200
96
-50
mV
Receiver Input Hysteresis
Receiver Input Resistance
Δ
VTH
RIN
VCM=0V
25
mV
-7V≤VCM
≤
12V
kΩ
1.0
VIN
=
12V
-7V
DE=GND,
VCC=GND
or 5V
IIN2
Input Current (A and B)
mA
-0.8
VIN
=
Receiver Output High
Voltage
IO
VID
=
=
-
1.5mA,
200mV
VCC
-1.5
VOH
V
V
IO
=
2.5mA, VID
=
200mV
Receiver Output Low Voltage VOL
0.4
±1
Three-State Output Current at
IOZR
VCC
=5V, 0V VO
≤
≤
VCC
µA
Receiver
Receiver Output Short Circuit
IOSR
0V≤VRO≤VCC
±8
±60
mA
Current
ESD Protection
Human Body Model
IEC61000-4-2 Air
IEC61000-4-2 Contact
±15
±15
±8
ESD Protection for A, B
kV
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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UM3085E/UM3088E
Switching Characteristics (UM3085E)
(VCC = +5V ± 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V
and TA = +25°C.)
Parameter
Symbol
fMAX
Test Conditions
Min Typ Max Unit
Maximum Data Rate
500
kbps
tDPLH
250 720 1000
250 720 1000
Figure
3
and 7, RDIFF
=
54Ω,
Driver Input-to-Output
Driver Output Skew
ns
CL1
=
CL2 100pF
=
tDPHL
Figure
3
and RDIFF
7
,
=
54Ω,
54Ω,
tDSKEW
tDR, tDF
tDZH
3
100
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CL1
=
CL2
=
100pF
|tDPLH - tDPHL
|
Figure
3
and
7
,
RDIFF=
Driver Rise or Fall Time
200 530 750
CL1
=
CL2
=
100pF
Figure
4
4
and
8
, CL
=
100pF,
100pF,
Driver Enable to Output
High
2500
2500
S2 Closed
and , CL
S1 Closed
and , CL
S1 Closed
and , CL
S2 Closed
|VID|≥2.0V,
all ime of
and 9,
Figure
Figure
Figure
8
=
tDZL
Driver Enable to Output Low
4
8
=
15pF,
15pF,
Driver Disable Time from
Low
tDLZ
100
4
8
=
Driver Disable Time from
High
tDHZ
100
,
tRPLH
Receiver Input to Output
127 200
Rise and
F
T
tRPHL
VID≤15ns
|VID|≥2.0V,
ime of
Figure
Rise and
6
Differential Receiver Skew
3
30
50
50
50
50
tRSKD
|tRPLH - tRPHL
|
F
all
T
VID≤15ns
Figure
5
and 10
,
Receiver Enable to Output
Low
tRZL
tRZH
tRLZ
20
20
20
20
CL
CL
CL
CL
=
100pF, S1
C
losed
Figure
=
5
and 10
,
Receiver Enable to Output
High
100pF, S2 Closed
Figure 5 and 10
=
,
Receiver Disable Time from
Low
100pF, S1 losed
C
Figure and 10
100pF, S2 Closed
(Note
Figure and
15pF, S2 Closed
Figure and
15pF, S1 Closed
Figure and 10
100pF, S2 Closed
Figure and 10
100pF, S1 Closed
5
,
Receiver Disable Time from
High
tRHZ
tSHDN
ns
ns
ns
=
Time to Shutdown
4
)
50
200 600
4500
4
8,
Driver Enable from
Shutdown to Output High
tDZH(SHDN)
CL
=
4
8,
Driver Enable from
Shutdown to Output Low
tDZL(SHDN)
tRZH(SHDN)
tRZL(SHDN)
4500
3500
3500
ns
ns
ns
CL
=
5
,
Receiver Enable from
Shutdown to Output High
CL=
5
,
Receiver Enable from
Shutdown to Output Low
CL=
______
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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UM3085E/UM3088E
Switching Characteristics (UM3088E)
(VCC = +5V ± 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V
and TA = +25°C.)
Parameter
Symbol
fMAX
Test Conditions
Min Typ Max Unit
Maximum Data Rate
2.5
34
34
Mbps
tDPLH
60
60
Figure
3
and 7, RDIFF
=
54Ω,
Driver Input-to-Output
Driver Output Skew
ns
CL1
=
CL2 100pF
=
tDPHL
Figure
3
and RDIFF
7
,
=
54Ω,
54Ω,
tDSKEW
tDR, tDF
tDZH
2.5
14
10
25
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CL1
=
CL2
=
100pF
|tDPLH - tDPHL
|
Figure
3
and
7
,
RDIFF=
Driver Rise or Fall Time
CL1
=
CL2
=
100pF
Figure
4
and
8
, CL
=
100pF,
100pF,
Driver Enable to Output
High
150
150
100
100
S2 Closed
and , CL
S1 Closed
and , CL
S1 Closed
and , CL
S2 Closed
|VID|≥2.0V,
all ime of
and 9,
Figure
Figure
Figure
4
8
=
tDZL
Driver Enable to Output Low
4
8
=
15pF,
15pF,
Driver Disable Time from
Low
tDLZ
4
8
=
Driver Disable Time from
High
tDHZ
,
tRPLH
Receiver Input to Output
106 150
Rise and
F
T
tRPHL
VID≤15ns
|VID|≥2.0V,
ime of
Figure
Rise and
6
Differential Receiver Skew
tRSKD
0
10
50
50
50
50
|tRPLH - tRPHL
|
Fall
T
VID≤15ns
Figure
5
and 10
,
Receiver Enable to Output
Low
tRZL
tRZH
tRLZ
20
20
20
20
CL
CL
CL
CL
=
100pF, S1
C
losed
Figure
5
and 10
losed
Figure 5 and 10
100pF, S1 losed
,
Receiver Enable to Output
High
=
100pF, S2 C
,
Receiver Disable Time from
Low
=
C
Figure and 10
100pF, S2 Closed
(Note
Figure and
15pF, S2 Closed
Figure and
15pF, S1 Closed
5
,
Receiver Disable Time from
High
tRHZ
tSHDN
ns
ns
ns
=
Time to Shutdown
4
)
50
200 600
250
4
8,
Driver Enable from
Shutdown to Output High
tDZH(SHDN)
CL
=
4
8,
Driver Enable from
Shutdown to Output Low
tDZL(SHDN)
250
3500
3500
ns
ns
ns
CL
=
Receiver Enable from
Shutdown to Output High
Figure 5 and 10,
CL=100pF, S2 Closed
tRZH(SHDN)
Receiver Enable from
Shutdown to Output Low
Figure 5 and 10,
tRZL(SHDN)
CL=100pF, 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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UM3085E/UM3088E
Pin Description
Pin Number
Symbol
Function
Receiver Output. If A＞B by -50mV, RO will be high; if A＜B by
1
RO
200mV, RO will be low.
______
Receiver Output Enable. Drive RE low to enable Receiver, RO is
______
______
______
2
RE
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
______
3
4
DE
DI
high impedance when DE is low. Drive RE high and DE low to
enter low-power shutdown mode.
Driver Input. A low on DI forces output A low and output B high.
Similarly, a high on DI forces output A high and output B low.
5
6
7
8
GND
A
Ground.
Non-Inverting Receiver Input and Non-Inverting Driver Output.
Inverting Receiver Input and Inverting Driver Output.
Power Supply for RS-485 Transceiver.
B
VCC
RS-485 Communication Function Table
Table1. Transmitting
INPUTS
OUTPUTS
MODE
DE
1
1
DI
1
0
B
0
1
A
1
0
RE
X
X
0
Normal
Normal
0
0
X
X
High-Z
High-Z
High-Z
High-Z
Normal
Shutdown
1
X=Don’t care; High-Z=High Impedance
Table2. Receiving
INPUTS
OUTPUTS
MODE
DE
X
X
X
0
A, B
> -50mV
< -200mV
Inputs Open
X
RO
1
0
1
RE
0
0
0
1
Normal
Normal
Normal
High-Z
Shutdown
X=Don’t care; High-Z=High Impedance
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UM3085E/UM3088E
Typical Operating Circuit
120ohm
120ohm
DE
B
B
B
A
DI
D
D
DI
A
A
DE
B
D
A
B
D
A
RO
RE
R
RO
RE
R
Master Node
Terminal Slave Node
R
R
DI
DE
RO RE
DI
DE
RO RE
Slave Node1
Slave Node N
Figure 1. Typical Half-Duplex RS-485 Network
Test Circuit
B
3V
DE
CL2
RLOAD/2
A
DI
RDIFF
VOD2
B
VOD
CL1
VOC
RLOAD/2
A
Figure 2. Driver DC Test Load
Figure 3. Driver Timing Test Circuit
1K
Test Point
+
Receiver
Output
VCC
VCC
500ohm
S1
S1
Driver Output
Under Test
CRL
+
15pF
1K
CL
S2
S2
Figure 4. Driver Enable/Disable Timing Test Load
Figure 5. Receiver Enable/Disable Timing Test Load
B
Receiver
Output
ATE
R
VD
A
Figure 6. Receiver Propagation Delay Test Circuit
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UM3085E/UM3088E
5V
0V
5V
1.5V
VO
1.5V
tDPHL
1.5V
1.5V
DI
B
tDPLH
DE
B
0V
tDZL(SHDN), tDZL
VOH
1/2VO
1/2VO
tDLZ
2.3V
Output Normally Low
VOL+0.5V
A
VOL
VOH
VO
0V
90%
VOH-0.5V
90%
VDIFF =VB - VA
tSKEW=|tDPLH-tDPHL
Output Normally High
2.3V
VDIFF
|
VOL
A
tDHZ
tDZH(SHDN), tDZH
10%
10%
-VO
tDR
tDF
Figure 7. Driver Propagation Delays
Figure 8. Driver Enable and Disable Times
5V
RE
RO
1.5V
1.5V
VOH
0V
VOH
tRZL(SHDN), tRZL
RO
OUTPUT
tRLZ
1.5V
tRPLH
1.5V
VOL
tRPHL
Output Normally Low
1.5V
1.5V
VOL+0.5V
VOH-0.5V
A
B
1V
INPUT
-1V
Output Normally High
VOL
tRHZ
tRZH(SHDN), tRZH
Figure 9. Receiver Propagation Delays
Figure 10. Receiver Enable and Disable Times
Detail Description
The UM3085E, UM3088E high-speed transceivers for RS-485 communication contain one driver
and one receiver. These devices feature fail-safe circuitry, which guarantees a logic-high receiver
output when the receiver inputs are open or shorted, or when they are connected to a terminated
transmission line with all drivers disabled. The UM3085E features reduced slew-rate driver that
minimizes EMI and reduces reflections caused by improperly terminated cables, allowing
error-free data transmission up to 500kbps. While partially slew-rate limited UM3088E speeds up
to 2.5Mbps.
All of the parts operate from a single +5V supply. Drivers are output short-circuit current limited.
Thermal shutdown circuitry protects drivers against excessive power dissipation. When activated,
the thermal shutdown circuitry places the driver outputs into a high impedance state.
Fail-Safe
The UM3085E, UM3088E 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 threshold between -50mV and -200mV. If the
differential receiver input voltage (A-B) is greater than or equal to -50mV, RO is logic high. If
A-B 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 thresholds of the UM3085E, UM3088E, this results in a logic high with a 50mV
minimum noise margin. Unlike previous fail-safe devices, the -50mV to -200mV threshold
complies with the ±200mV EIA/TIA-485 standard.
±15kV ESD Protection
As with all Union devices, ESD-protection structures are incorporated on all pins to protect
against electrostatic discharges encountered during handling and assembly. The driver outputs and
receiver inputs of the UM3085E, UM3088E have extra protection against static electricity.
Union’s engineers have developed state-of-the-art structures to protect these pins against ESD of
±15kV without damage. The ESD-protected pins are tested with reference to the ground pin in a
powered-down condition. They are tested to ±15kV using the Human Body Model.
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UM3085E/UM3088E
Applications Information
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.
Reduced EMI and Reflections
The UM3085E is slew-rate limited, minimizing EMI and reducing reflections caused by
improperly terminated cables. In general, a transmitter’s rise time relates directly to the length of
an unterminated stub, which can be driven with only minor waveform reflections. The following
equation expresses this relationship conservatively:
Length=tRISE / (10×1.5ns/ft)
Where tRISE is the transmitter’s rise time.
A system can work well with longer unterminated stubs, even with severe reflections, if the
waveform settles out before the UART samples them.
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 2nA 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. 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 UM3085E, UM3088E 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 off the main line should be kept as short as
possible.
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UM3085E/UM3088E
Package Information
SOP8
Outline Drawing
c
D
DIMENSIONS
MILLIMETERS
INCHES
Min Max
Symbol
Min
1.35
0.10
1.35
0.33
0.17
4.70
3.80
5.80
Max
1.75
0.25
1.55
0.51
0.25
5.10
4.00
6.20
A
A1
A2
b
c
D
E
0.053 0.069
0.004 0.010
0.053 0.061
0.013 0.020
0.006 0.010
0.185 0.200
0.150 0.157
0.228 0.244
0.050BSC
1
2
θ
e
Top View
End View
E1
e
1.27BSC
b
L
θ
0.40
0°
1.27
8°
0.016 0.050
0°
8°
Side View
Land Pattern
NOTES:
1. Compound dimension: 4.90×3.90；
2. Unit: mm;
1.27
3. General tolerance ±0.05mm unless otherwise
specified;
0.50
4. The layout is just for reference.
Tape and Reel Orientation
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UM3085E/UM3088E
DIP8
Outline Drawing
DIMENSIONS
MILLIMETERS
INCHES
Symbol
Min
-
Max
5.08
-
Min
-
Max
0.200
-
E
D1
E1
A
A1
A2
A3
b
b1
C
D
D1
E
E1
e
eA
eB
L
0.38
3.18
1.40
0.41
1.14
0.20
8.84
0.13
7.62
6.10
2.54
7.62
-
0.015
0.125
0.055
0.016
0.045
0.008
0.348
0.005
0.300
0.240
0.100
0.300
-
4.45
2.03
0.56
1.65
0.30
9.91
2.03
8.26
7.87
-
0.175
0.080
0.022
0.065
0.012
0.390
0.080
0.325
0.310
-
eA
eB
C
Top View
D
End View
e
b1
b
Side View
-
-
10.16
3.81
0.400
0.150
2.92
0.115
________________________________________________________________________
http://www.union-ic.com Rev.05 Sep.2015 11/12
UM3085E/UM3088E
GREEN COMPLIANCE
Union Semiconductor is committed to environmental excellence in all aspects of its
operations including meeting or exceeding regulatory requirements with respect to the use
of hazardous substances. Numerous successful programs have been implemented to
reduce the use of hazardous substances and/or emissions.
All Union components are compliant with the RoHS directive, which helps to support
customers in their compliance with environmental directives. For more green compliance
information, please visit:
http://www.union-ic.com/index.aspx?cat_code=RoHSDeclaration
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: Unit 606, No.570 Shengxia Road, Shanghai 201210
Tel: 021-51093966
Fax: 021-51026018
Website: www.union-ic.com
________________________________________________________________________
http://www.union-ic.com Rev.05 Sep.2015
12/12
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