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
Air-Condition, Building Lighting and
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
Features
Automatic Polarity Reversal RS-485
Transceivers
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
NC
RO
RE
DE
DI
NC
GND
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Top View
14
13
12
11
10
9
8
V
CC
NC
L2
L1
NC
NC
1
2
3
4
5
6
7
UM3089EESD
XX
NC
XX: Week Code
Ordering Information
Part Number
UM3089EESD
Marking Code
UM3089EESD
Package Type
SOP14
Shipping Qty
2500pcs/13 Inch Tape & Reel
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UM3089E
Absolute Maximum Ratings
Symbol
V
CC
Parameter
Supply Voltage
Control Input Voltage (/RE, DE)
Driver Input Voltage (DI)
Driver Output Voltage (L1, L2)
Receiver Input Voltage (L1, L2)
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° (Note 1)
C.)
Parameter
SUPPLY CURRENT
DE = V
CC
,
No load, /RE=0V or V
CC
DI = GND
DE =0V,
or V
CC
/RE=0V
DE = GND, /RE= V
CC
0.3
mA
0.25
0.002
10
µ
A
Symbol
Test Conditions
Min
Typ
Max
Unit
Supply Current
I
CC
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
V
IH1
V
IL1
V
HYS
DE, DI, /RE
DE, DI, /RE
2.0
0.4
300
V
V
mV
V
OD1
V
OD2
ΔV
OD
V
OC
ΔV
OC
No Load, Figure 2
Figure 2, R
L
= 54Ω
Figure 2, R
L
= 54Ω;
(Note 2)
Figure 2, R
L
= 54Ω
Figure 2, R
L
= 54Ω;
(Note 2)
V
OUT
= -7V
4.9
2.0
2.2
5
V
V
0.1
2.2
2.5
0.1
-250
V
V
V
I
OSD
mA
V
OUT
= 12V
250
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UM3089E
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° (Note 1)
C.)
Parameter
RECEIVER
Receiver Differential
Threshold Voltage
Receiver Input Hysteresis
Receiver Input Resistance
V
TH
ΔV
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
0.1
0.08
1.0
mA
-0.8
V
0.4
±
1
V
µ
A
-200
25
-50
mV
mV
kΩ
Symbol
Test Conditions
Min
Typ
Max
Unit
Input Current (L1 and L2)
I
IN2
Receiver Output High Voltage
Receiver Output Low Voltage
Three-State Output Current at
Receiver
Receiver Output Short Circuit
Current
Thermal Shutdown
Temperature
V
OH
V
OL
I
OZR
I
O
= -1.5mA, V
ID
= 200mV V
CC
-1.5
I
O
= 2.5mA, V
ID
= 200mV
0V ≤ V
O
≤ V
CC
I
OSR
0V≤V
RO
≤V
CC
±
8
±
60
mA
T
SHDN
140
°
C
Thermal Shutdown Hystersis
ESD Protection
△T
SHDN
20
°
C
ESD Protection for L1, L2
Human Body Model
IEC61000-4-2 Air-Gap
Discharge
IEC61000-4-2 Contact
Discharge
±
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.
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UM3089E
Switching 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.)
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
50
100
50
50
Test Conditions
Min
Typ
500
100
100
3
200
100
100
50
50
100
200
ns
200
100
500
2500
2500
100
100
200
ns
ns
ns
ns
ns
ns
ns
Max
Unit
kbps
4
30
ns
20
20
20
20
200
200
200
200
200
600
4500
4500
3500
3500
ns
ns
ns
ns
ns
ns
ns
ns
ns
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 T
S
time, the polarities will be reversed
automatically.
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Waiting Time for Inverting
T
s
DE=/RE=L, RO keeps L
150
200
250
ms
Pin Description
Pin Number
1
2
3
Symbol
NC
RO
/RE
Not Connected.
Receiver Output.
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.
Driver Input
Not Connected.
Ground
Not Connected.
Not Connected.
Not Connected.
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.
Not Connected.
Power Supply for RS-485 Transceiver
Function
4
5
6
7
8
9
10
11
DE
DI
NC
GND
NC
NC
NC
L1
12
13
14
L2
NC
V
CC
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