UM3483E/UM3486E
3V to 5.5V-Powered, ±15kV ESD-Protected,
Slew-Rate-Limited, True RS-485 Transceivers
UM3483E/UM3486E SOP8/DIP8
General Description
The UM3483E, UM3486E are 3V to 5.5V-powered, ±15kV ESD-protected, slew-rate-limited
differential transceivers which provide full RS485 compatibility. Each part contains one driver
and one receiver, which is designed for data transmission with extended common mode range
(-7V to 12V). The UM3483E features slew-rate-limited driver which minimizes EMI and reduces
reflections resulted from improperly terminated cables. The UM3483E allows up to 500kbps
error-free data transmission, while the partially slew-rate-limited UM3486E transmits at data rates
up to 2.5Mbps.
The UM3483E, UM3486E also feature enhanced electrostatic discharge (ESD) protection. All of
the transmitter outputs and receiver inputs are protected to ±15kV using IEC61000-4-2 Air-Gap
Discharge, ±15kV using the Human Body Model and ±8kV using IEC61000-4-2 Contact
Discharge.
Drivers are short-circuit current limited. When the driver outputs are placed into a
high-impedance state by thermal shutdown circuitry, drivers are protected against excessive
power dissipation. And the fail-safe feature of the receiver input guarantees a logic-high output if
both inputs are open, shorted or idle.
Both parts have power up/down mode, the glitch-free driver outputs permit live insertion or
removal of the transceiver into/from the data bus. The CMOS design offers significant power
savings without sacrificing ruggedness against overload or ESD damage. The typical quiescent
current is only 300μA during operation and 1μA in shutdown mode.
The UM3483E, UM3486E are intended for half-duplex communication and are available in SOP8
and DIP8 packages.
Applications
Features
Telecommunications
Low-Power RS-485 Transceivers
Integrated Services Digital Networks
Industrial-Control Local Area
Networks
Transceivers for EMI-Sensitive
Applications
Packet Switching
Level Translators
ESD Protection for RS-485 I/O Pins
±15kV—Human Body Model
±15kV—IEC61000-4-2, Air-Gap Discharge
±8kV—IEC61000-4-2, Contact Discharge
3V to 5.5V Supply Voltage Range
Enhanced Slew-Rate Limiting Facilitates
Error-Free Data Transmission
1μA 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
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UM3483E/UM3486E
Ordering Information
Part Number
Operating
Temperature
Mark Code
Package Type
UM3483EESA
-40°C to +85°C
UM3483EESA
SOP8
UM3483EEPA
-40°C to +85°C
UM3483EEPA
DIP8
UM3486EESA
-40°C to +85°C
UM3486EESA
SOP8
UM3486EEPA
-40°C to +85°C
UM3486EEPA
DIP8
Shipping Qty
3000pcs/13 Inch
Tape & Reel
50pcs/Tube
3000pcs/13 Inch
Tape & Reel
50pcs/Tube
Selection Guide
Part
Number
UM3483E
UM3486E
Guaranteed
Date Rate
(Mbps)
0.5
2.5
Low-Power
Shutdown
Slew-Rate
Limited
Yes
Yes
Yes
Yes
Pin Configurations
Driver/
Receiver
Enable
Yes
Yes
Shutdown
Current
(μA)
1
1
Transceivers
On Bus
256
256
±15kV
ESD
Protection
Yes
Yes
Top View
RO 1
8
VCC
RE
2
7
B
DE
3
6
A
DI
4
5
GND
RO 1
8
VCC
RE
2
7
B
DE
3
6
A
DI
4
5
GND
XX: Week Code
UM3483EESA
SOP8
XX: Week Code
UM3486EESA
SOP8
XX: Week Code
UM3483EEPA
DIP8
XX: Week Code
UM3486EEPA
DIP8
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2/18
UM3483E/UM3486E
Absolute Maximum Ratings
Symbol
VCC
PD
TA
TSTG
TL
Parameter
Supply Voltage
Value
+7
Unit
V
Control Input Voltage (/RE, DE)
-0.3V to (VCC + 0.3V)
V
Driver Input Voltage (DI)
-0.3V to (VCC + 0.3V)
V
Driver Output Voltage (A, B)
-7 to +12
V
Receiver Input Voltage (A, B)
-7 to +12
V
Receiver Output Voltage (RO)
-0.3V to (VCC + 0.3V)
V
Continuous Power Dissipation at
TA = 70°C
DIP8
727
SOP8
471
-40 to +85
-65 to +160
+300
Ambient Temperature
Storage Temperature Range
Lead Temperature for Soldering 10 seconds
mW
°C
°C
°C
DC Electrical Characteristics
(VCC = +3V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA =
+25°C.)
Parameter
SUPPLY CURRENT
Supply Current
Supply Current in Shutdown
Mode
LOGIC
Input High Voltage
Input Low Voltage
Logic Input Current
Driver
Symbol
ICC
ISHDN
VIH
VIL
IIN1
Test Conditions
DE=VCC,
No load,
/RE=0V
or VCC
DI = GND
or VCC
DE=0V, /RE=0V
DE, DI, /RE
DE, DI, /RE
DE, DI, /RE
VOD
RL=54Ω
Figure 1
RL=60Ω
Figure 1
Change in Magnitude of
Driver Differential Output
Voltage for Complementary
Output States (Note 1)
Driver Common-Mode
Output Voltage
Change in Magnitude of
Common-Mode Output
Voltage (Note 1)
Driver Short-Circuit Output
Current
VCC=3.3V
VCC=5V
VCC=3.3V
VCC=5V
VCC=3.3V
VCC=5V
Typ
Max
0.15
1
0.15
1
DE=0V, /RE=VCC,
DI=VCC or 0V
No Load
Figure 1
Differential Driver Output
Min
Unit
mA
1
µA
0.8
1
V
V
µA
2.0
3.3
5
1.2
1.5
1.3
1.5
V
ΔVOD
RL=54Ω or 100Ω, Figure 1
0.2
V
VOC
RL=54Ω or 100Ω, Figure 1
3
V
ΔVOC
RL=54Ω or 100Ω, Figure 1
0.2
V
IOSD
VOUT = -7V
VOUT = 12V
-250
+250
mA
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UM3483E/UM3486E
DC Electrical Characteristics (Continued)
(VCC = +3V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA =
+25°C.)
Parameter
Symbol
Test Conditions
Min
Typ
-0.2
-0.05
Max Unit
RECEIVER
Receiver Differential
Threshold Voltage
VTH
-7V≤VCM≤12V
Receiver Input Hysteresis
ΔVTH
VCM=0V
Receiver Input Resistance
RIN
-7V≤VCM≤12V
Input Current (A, B)
IIN2
DE=0V,
VCC=0V or
+3V to 5.5V
0.2
25
V
mV
96
kΩ
VIN = 12V
1
VIN = -7V
-0.8
mA
Receiver Output High Voltage
VOH
IOUT=-1.5mA, VID=200mV,
Figure 2
Receiver Output Low Voltage
VOL
IOUT=2.5mA, VID=200mV,
Figure 2
0.4
V
Three-State (High Impedance)
Output Current at Receiver
IOZR
0V≤VOUT≤VCC
1
µA
Receiver Short-Circuit Output
Current
IOSR
0V≤VRO≤VCC
±60
mA
Vcc-1.5
V
±20
ESD Protection
ESD Protection for A, B
Human Body Model
IEC61000-4-2 Air Discharge
±15
±15
IEC61000-4-2 Contact
Discharge
±8
kV
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4/18
UM3483E/UM3486E
Driver Switching Characteristics (UM3483E)
(VCC = +3V to 5.5V, TA = +25°C.)
Parameter
Symbol
Maximum Data Rate
fMAX
Driver Differential Output Delay
tDD
RL=60Ω, Figure 3
250
500
1000
ns
tTD
RL=60Ω, Figure 3
250
500
750
ns
tPLH
RL=27Ω, Figure 4
250
550
1000
ns
tPHL
RL=27Ω, Figure 4
250
550
1000
ns
tPDS
RL=27Ω, Figure 4
10
30
ns
Driver Output Enable Time to Low Level
tPZL
RL=110Ω, Figure 6
100
2500
ns
Driver Output Enable Time to High Level
tPZH
RL=110Ω, Figure 5
100
2500
ns
tPHZ
RL=110Ω, Figure 5
100
100
ns
tPLZ
RL=110Ω, Figure 6
100
100
ns
tPSL
RL=110Ω, Figure 6
500
2500
ns
tPSH
RL=110Ω, Figure 5
500
2500
ns
Typ
Max
Unit
Driver Differential Output Transition Time
Driver Propagation Delay,
Low-to-High Level
Driver Propagation Delay,
High-to-Low Level
| tPLH – tPHL | Driver Propagation Delay
Skew (Note 2)
Test Conditions
Min
Typ
Max
500
Unit
kbps
Driver-Output Enable/Disable Times
Driver Output Disable Time from High
Level
Driver Output Disable Time from Low
Level
Driver Output Enable Time from Shutdown
to Low Level
Driver Output Enable Time from Shutdown
to High Level
Driver Switching Characteristics (UM3486E)
(VCC = +3V to 5.5V, TA = +25°C.)
Parameter
Symbol
Maximum Data Rate
fMAX
Driver Differential Output Delay
tDD
RL=60Ω, Figure 3
20
50
100
ns
tTD
RL=60Ω, Figure 3
20
50
100
ns
tPLH
RL=27Ω, Figure 4
25
55
100
ns
tPHL
RL=27Ω, Figure 4
25
55
100
ns
tPDS
RL=27Ω, Figure 4
2
10
ns
Driver Output Enable Time to Low Level
tPZL
RL=110Ω, Figure 6
60
100
ns
Driver Output Enable Time to High Level
tPZH
RL=110Ω, Figure 5
60
100
ns
tPHZ
RL=110Ω, Figure 5
60
100
ns
tPLZ
RL=110Ω, Figure 6
60
100
ns
tPSL
RL=110Ω, Figure 6
500
800
ns
tPSH
RL=110Ω, Figure 5
500
800
ns
Driver Differential Output Transition Time
Driver Propagation Delay, Low-to-High
Level
Driver Propagation Delay, High-to-Low
Level
| tPLH – tPHL | Driver Propagation Delay
Skew (Note 2)
Test Conditions
Min
2500
kbps
Driver-Output Enable/Disable Times
Driver Output Disable Time from High
Level
Driver Output Disable Time from Low
Level
Driver Output Enable Time from Shutdown
to Low Level
Driver Output Enable Time from Shutdown
to High Level
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5/18
UM3483E/UM3486E
Receiver Switching Characteristics
(VCC = +3V to 5.5V, TA = +25°C.)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Time to Shutdown
tSHDN
UM3483E/UM3486E
(Note 3)
50
200
600
ns
Receiver Propagation Delay,
Low-to-High Level
tRPLH
100
200
ns
Receiver Propagation Delay,
High-to-Low Level
tRPHL
100
200
ns
| tRPLH – tRPHL | Receiver
Propagation Delay Skew
tRPDS
30
ns
20
100
ns
20
100
ns
30
200
ns
30
200
ns
20
100
ns
20
100
ns
Receiver Output Enable Time
to Low Level
Receiver Output Enable Time
to High Level
Receiver Output Disable Time
from High Level
Receiver Output Disable Time
from Low Level
Receiver Output Enable Time
from Shutdown to Low Level
Receiver Output Enable Time
from Shutdown to High Level
tPRZL
tPRZH
tPRHZ
tPRLZ
tPRSL
tPRSH
VID=0 to 3.0V, CL=15pF,
Figure 7
UM3483E
VID=0 to 3.0V, CL=15pF,
Figure 7
UM3483E
VID=0 to 3.0V, CL=15pF,
Figure 7
UM3483E
CL=15pF, Figure 8,
UM3483E/UM3486E
CL=15pF, Figure 8,
UM3483E/UM3486E
CL=15pF, Figure 8,
UM3483E/UM3486E
CL=15pF, Figure 8,
UM3483E/UM3486E
CL=15pF, Figure 8,
UM3483E/UM3486E
CL=15pF, Figure 8,
UM3483E/UM3486E
Note 1: ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes
state.
Note 2: Measured on | tPLH (A)– tPHL (A)| and | tPLH (B)– tPHL (B)|.
Note 3: The transceivers are put into shutdown by bringing /RE high and DE low. If the inputs are
in this state for less than 80ns, the parts are guaranteed not to enter shutdown. If the inputs are in
this state for at least 300ns, the parts are guaranteed to have entered shutdown. See Low-Power
Shutdown Mode section.
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UM3483E/UM3486E
Typical Operating Characteristics
(VCC=+3.3V, TA=+25ºC, unless otherwise noted.)
Supply Current vs. Temperature
DE=1, /RE=0, DI=1
Supply Current vs. Temperature
DE=1, /RE=0, DI=0
Output Current
vs. Receiver Output High Voltage
Output Current
vs. Receiver Output Low Voltage
Receiver Output High Voltage vs.
Temperature
Receiver Output Low Voltage vs.
Temperature
Driver Differential Output Voltage vs. Temperature
DI=1
Driver Differential Output Voltage vs. Temperature
DI=0
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7/18
UM3483E/UM3486E
Typical Operating Characteristics (Continued)
(VCC=+3.3V, TA=+25ºC, unless otherwise noted.)
Differential Output Current
vs. Differential Output Voltage
Shutdown Current vs. Temperature
A B Short-Circuit Current vs. Temperature
DI=1
A B Short-Circuit Current vs. Temperature
DI=0
RO Short-Circuit Current vs. Temperature
R0=1
RO Short-Circuit Current vs. Temperature
R0=0
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8/18
UM3483E/UM3486E
Typical Operating Characteristics (Continued)
(VCC=+5.0V, TA=+25ºC, unless otherwise noted.)
Supply Current vs. Temperature
DE=1, /RE=0, DI=1
Output Current
vs. Receiver Output High Voltage
Supply Current vs. Temperature
DE=1, /RE=0, DI=0
Output Current
vs. Receiver Output Low Voltage
Receiver Output High Voltage vs. Temperature
Receiver Output Low Voltage vs. Temperature
Driver Differential Output Voltage vs. Temperature
DI=1, RL=54Ω
Driver Differential Output Voltage vs. Temperature
DI=0, RL=54Ω
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9/18
UM3483E/UM3486E
Typical Operating Characteristics (Continued)
(VCC=+5.0V, TA=+25ºC, unless otherwise noted.)
Differential Output Current
vs. Differential Output Voltage
Shutdown Current vs. Temperature
A B Short-Circuit Current vs. Temperature
DI=1
A B Short-Circuit Current vs. Temperature
DI=0
RO Short-Circuit Current vs. Temperature
R0=1
RO Short-Circuit Current vs. Temperature
R0=0
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http://www.union-ic.com Rev.06 May.2020
10/18
UM3483E/UM3486E
Pin Description
Pin Number
Symbol
Function
1
RO
Receiver Output. If A＞B by -50mV, RO will be high; if A＜B by
200mV, RO will be low.
2
______
______
RE
Receiver Output Enable. RO is enabled when RE is low; RO is
______
______
high impedance when RE is high. Drive RE high and DE low to
enter low-power shutdown mode.
Driver Output Enable. The driver outputs are enabled by bringing
______
3
DE
DE high. They are high impedance when DE is low. If RE is high
and DE is low, the device will enter a low-power shutdown mode.
If the driver outputs are enabled, the parts function as line drivers.
While they are high impedance, they function as line receivers if
______
RE is low.
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.
Ground
4
DI
5
GND
6
A
Non-inverting Receiver Input and Non-inverting Driver Output
7
B
Inverting Receiver Input and Inverting Driver Output.
8
VCC
Positive Supply: 3.0V≤VCC≤5.5V
RS-485 Communication Function Table
Table1. Transmitting
INPUTS
OUTPUTS
DE
DI
B
A
RE
X
1
1
0
1
X
1
0
1
0
0
0
X
High-Z
High-Z
1
0
X
High-Z
High-Z
X=Don’t care; High-Z=High impedance
______
MODE
Normal
Normal
Normal
Shutdown
Table2. Receiving
INPUTS
DE
A, B
RE
0
X
>-50mV
0
X
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