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
RS-485 Transceivers
Level Translators
Industrial-Control Local Area
Networks
Transceivers for EMI-Sensitive
Applications
Features
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
UM3085EESA
UM3085EEPA
UM3088EESA
UM3088EEPA
Operating Temperature
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Mark Code
UM3085EESA
UM3085EEPA
UM3088EESA
UM3088EEPA
Package Type
SOP8
DIP8
SOP8
DIP8
Selection Guide
Part
Number
UM3085E
UM3088E
Guaranteed
Date Rate
(Mbps)
0.5
2.5
Low-Power
Shutdown
Yes
Yes
Slew-Rate
Limited
Yes
Yes
Driver/
Receiver
Enable
Yes
Yes
Shutdown
Transceivers
Current
On Bus
(nA)
2
256
2
256
±15kV
ESD
Protection
Yes
Yes
________________________________________________________________________
http://www.union-ic.com Rev.03Jun.2013
1/12
UM3085E/UM3088E
Absolute Maximum Ratings
Symbol
V
CC
Parameter
Supply Voltage
Control Input Voltage (/RE, DE)
Driver Input Voltage (DI)
Driver Output Voltage (A, B)
Receiver Input Voltage (A, B)
Receiver Output Voltage (RO)
T
A
T
STG
T
L
Ambient Temperature
Storage Temperature Range
Lead Temperature for Soldering 10 seconds
Value
+7
-0.3V to (V
CC
+ 0.3V)
-0.3V to (V
CC
+ 0.3V)
-7.5 to +12.5
-7.5 to +12.5
-0.3V to (V
CC
+ 0.3V)
-40 to +85
-65 to +160
+300
Unit
V
V
V
V
V
V
°C
°C
°C
DC Electrical Characteristics
(V
CC
= +5V ± 5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V
and T
A
= +25°C.) (Note 1)
Parameter
SUPPLY CURRENT
Supply Current
I
CC
DE = V
CC
,
0.3
No load,
_______
R E =0V or V
CC
DI = GND
DE =0V,
or V
CC
_______
0.25
R E =0V
DE = GND, R E = V
CC
______
_______
Symbol
Test Conditions
Min
Typ
Max
Unit
mA
Supply Current in Shutdown
Mode
LOGIC
Input High Voltage
Input Low Voltage
DI Input Hysteresis
DRIVER
Differential Driver Output
Differential Driver Output
Change-in-Magnitude of
Differential Output Voltage
Driver Common-Mode
Output Voltage
Change-in-Magnitude of
Common-Mode Voltage
Driver Short-Circuit Output
Current (Note 3)
I
SHDN
0.002
10
µA
V
IH1
V
IL1
V
HYS
DE, DI, R E
DE, DI, R E
UM3085E
2.0
0.8
100
V
V
mV
______
V
OD1
V
OD2
ΔV
OD
V
OC
ΔV
OC
No Load, Figure 2
Figure 2, R = 50Ω
Figure 2, R = 50Ω;
(Note 2)
Figure 2, R = 50Ω
Figure 2, R = 50Ω;
(Note 2)
V
OUT
= -7V
V
OUT
= 12V
-250
250
1.5
5
V
V
0.2
3.0
0.2
V
V
V
I
OSD
mA
________________________________________________________________________
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2/12
UM3085E/UM3088E
DC Electrical Characteristics (Continued)
(V
CC
= +5V ± 5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V and
T
A
= +25°C.) (Note 1)
Parameter
RECEIVER
Receiver Differential
Threshold Voltage
Receiver Input Hysteresis
Receiver Input Resistance
V
TH
Δ
V
TH
R
IN
-7V≤V
CM
≤12V
V
CM
=0V
-7V≤V
CM
≤12V
DE = GND,
V
CC
= GND
or 5V
V
IN
= 12V
V
IN
= -7V
96
1.0
mA
-0.8
V
0.4
±1
V
µA
-200
25
-50
mV
mV
KΩ
Symbol
Test Conditions
Min
Typ
Max
Unit
Input Current (A and B)
I
IN2
Receiver Output High Voltage
Receiver Output Low Voltage
Three-State Output Current at
Receiver
Receiver Output Short Circuit
Current
ESD Protection
ESD Protection for A, B
V
OH
V
OL
I
OZR
I
O
= -1.5mA, V
ID
= 200mV V
CC
-1.5
I
O
= 2.5mA, V
ID
= 200mV
V
CC
= 5V, 0V
≤
V
O
≤
V
CC
I
OSR
0V≤V
RO
≤V
CC
±8
±60
mA
Human Body Model
IEC61000-4-2 Air Discharge
IEC61000-4-2 Contact
±15
±15
±8
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:
ΔV
OD
and
ΔV
OC
are the changes in V
OD
and V
OC
, 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.
________________________________________________________________________
http://www.union-ic.com Rev.03Jun.2013
3/12
UM3085E/UM3088E
Switching Characteristics (UM3085E)
(V
CC
= +5V ± 5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V
and T
A
= +25°C.)
Parameter
Maximum Data Rate
Driver Input-to-Output
Driver Output Skew
| t
DPLH
- t
DPHL
|
Driver Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from
Low
Driver Disable Time from
High
Receiver Input to Output
Differential
Receiver Skew
| t
RPLH
- t
RPHL
|
Receiver Enable to Output
Low
Receiver Enable to Output
High
Receiver Disable Time from
Low
Receiver Disable Time from
High
Time to Shutdown
Driver Enable from
Shutdown to Output High
Driver Enable from
Shutdown to Output Low
Receiver Enable from
Shutdown to Output High
Receiver Enable from
Shutdown to Output Low
Symbol
f
MAX
t
DPLH
t
DPHL
t
DSKEW
t
DR
, t
DF
t
DZH
t
DZL
t
DLZ
t
DHZ
t
RPLH
,
t
RPHL
t
RSKD
t
RZL
t
RZH
t
RLZ
t
RHZ
t
SHDN
t
DZH(SHDN)
t
DZL(SHDN)
t
RZH(SHDN)
t
RZL(SHDN)
Figures 3 and 7, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 3 and 7, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 3 and 7, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 4 and 8, C
L
= 100pF,
S2 closed
Figures 4 and 8, C
L
= 100pF,
S1 closed
Figures 4 and 8, C
L
= 15pF,
S1 closed
Figures 4 and 8, C
L
= 15pF,
S2 closed
| V
ID
|
≥
2.0V;
rise and fall time of V
ID
≤
15ns
Figures 6 and 9; | V
ID
|
≥
2.0V;
rise and fall time of V
ID
≤
15ns
Figures 5 and 10, C
L
= 100pF,
S1 closed
Figures 5 and 10, C
L
= 100pF,
S2 closed
Figures 5 and 10, C
L
= 100pF,
S1 closed
Figures 5 and 10, C
L
= 100pF,
S2 closed
(Note 4)
Figures 4 and 8, C
L
= 15pF,
S2 closed
Figures 4 and 8, C
L
= 15pF,
S1 closed
Figures 5 and 10, C
L
= 100pF,
S2 closed
Figures 5 and 10, C
L
= 100pF,
S1 closed
_______
Test Conditions
Min
250
250
Typ
500
720
720
3
Max
1000
1000
100
750
2500
2500
100
100
Unit
kbps
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
200
530
127
3
20
20
20
20
50
200
200
30
50
50
50
50
600
4500
4500
3500
3500
Note 4: The device is put into shutdown by bringing R E 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.
________________________________________________________________________
http://www.union-ic.com Rev.03Jun.2013
4/12
UM3085E/UM3088E
Switching Characteristics (UM3088E)
(V
CC
= +5V ± 5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5V
and T
A
= +25°C.)
Parameter
Maximum Data Rate
Driver Input-to-Output
Driver Output Skew
| t
DPLH
- t
DPHL
|
Driver Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from
Low
Driver Disable Time from
High
Receiver Input to Output
Differential
Receiver Skew
| t
RPLH
- t
RPHL
|
Receiver Enable to Output
Low
Receiver Enable to Output
High
Receiver Disable Time from
Low
Receiver Disable Time from
High
Time to Shutdown
Driver Enable from
Shutdown to Output High
Driver Enable from
Shutdown to Output Low
Receiver Enable from
Shutdown to Output High
Receiver Enable from
Shutdown to Output Low
Symbol
f
MAX
t
DPLH
t
DPHL
t
DSKEW
t
DR
, t
DF
t
DZH
t
DZL
t
DLZ
t
DHZ
t
RPLH
,
t
RPHL
t
RSKD
t
RZL
t
RZH
t
RLZ
t
RHZ
t
SHDN
t
DZH(SHDN)
t
DZL(SHDN)
t
RZH(SHDN)
t
RZL(SHDN)
Figures 3 and 7, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 3 and 7, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 3 and 7, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
Figures 4 and 8, C
L
= 100pF,
S2 closed
Figures 4 and 8, C
L
= 100pF,
S1 closed
Figures 4 and 8, C
L
= 15pF,
S1 closed
Figures 4 and 8, C
L
= 15pF,
S2 closed
| V
ID
|
≥
2.0V;
rise and fall time of V
ID
≤
15ns
Figures 6 and 9; | V
ID
|
≥
2.0V;
rise and fall time of V
ID
≤
15ns
Figures 5 and 10, C
L
= 100pF,
S1 closed
Figures 5 and 10, C
L
= 100pF,
S2 closed
Figures 5 and 10, C
L
= 100pF,
S1 closed
Figures 5 and 10, C
L
= 100pF,
S2 closed
(Note 4)
Figures 4 and 8, C
L
= 15pF,
S2 closed
Figures 4 and 8, C
L
= 15pF,
S1 closed
Figures 5 and 10, C
L
= 100pF,
S2 closed
Figures 5 and 10, C
L
= 100pF,
S1 closed
_______
Test Conditions
Min
Typ
2.5
34
34
2.5
14
Max
60
60
10
25
150
150
100
100
Unit
Mbps
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
106
0
20
20
20
20
50
200
150
10
50
50
50
50
600
250
250
3500
3500
Note 4: The device is put into shutdown by bringing R E 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.
________________________________________________________________________
http://www.union-ic.com Rev.03Jun.2013
5/12
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