Union Semiconductor, Inc.
http://www.union-ic.com
UM3483E, UM3486E
General Description
3.3V-Powered, ±15kV ESD-Protected,
and Slew-Rate-Limited True RS-485 Transceivers
The UM3483E, UM3486E are +15 KV ESD protected, slew-rate limited, ultra lower differential line transceivers which provide full
RS485 compatibility while operating from single 3.3V supply. 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 that minimizes
EMI and reduces reflections caused by improperly terminated cables, allowing error-free data transmission at data rate up to 500kbps,
while partially slew-rate limited UM3486E transmits up to 2.5Mbps.
All devices feature enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver inputs are protected to
±15kV using IEC 1000-4-2 Air-Gap Discharge and ±15kV using the Human Body Model.
Drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry that
places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if
both inputs are open, shorted or idle.
Both parts have power up/down glitch free driver outputs permit live insertion or removal of transceiver from/to data bus. The
CMOS design offers significant power savings without sacrificing ruggedness against overload or ESD damage. Typical quiescent
current is only 500 μA while operating and 1 μA in shutdown.
The UM3483E, UM3486E are fully specified over the commercial an extended industrial temperature range and are available in 8-pin
and DIP packages.
Applications
Telecommunications
Low-Power RS-485 Transceivers
Integrated Services Digital Networks
Transceivers for EMI-Sensitive Applications
Packet Switching
Features
ESD Protection for RS-485 I/O Pins
±15kV—Human Body Model
±15kV—IEC 1000-4-2, Air-Gap Discharge
Operate from a Single 3.3V supply
Interoperable with +5V Logic
Slew-Rate Limited for Errorless Data Transmission
1 μA 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
UM3483EESA
UM3483EEPA
UM3486EESA
UM3486EEPA
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
8 Plastic DIP
8 SO
8 Plastic DIP
UM3483E,UM3486E Datasheet Rev.0.1, Dec.2005
Page 1 of 12
Union Semiconductor, Inc.
Selector Guide
PART
NUMBER
UM3483E
UM3486E
GUARANTEED
DATA RATE
(Mbps)
0.5
2.5
SUPPLY
VOLTAGE
(V)
3.0 to 3.6
SLEW-RATE
LIMITED
Yes
Yes
DRIVER/
RECEIVER
ENABLE
Yes
Yes
http://www.union-ic.com
SHUTDOWN
CURRENT
(µA)
1
1
±15kV
ESD
PROTECTION
Yes
Yes
PIN
COUNT
8
8
Absolute Maximum Ratings
Supply Voltage (VCC) ..............................… … … ..................5V
Control Input Voltage (/RE, D E) .............… … … .....-0.3V to 5V
Driver Input Voltage (DI) ......................… … … .......-0.3V to 5V
Driver Output Voltage (A, B).............… … … … … … -7V to 12V
Receiver Input Voltage (A, B) ..........… … … ...… ......-7V to 12V
Receiver Output Voltage (RO).… … … ...-0.3V to (VCC + 0.3V)
Continuous Power Dissipation (TA = +70°C)
8-Pin Plastic D IP (derate 9.09mW /°C above +70°C)..727mW
8-Pin SO (derate 5.88mW /°C above +70°)… … … … .471mW
Operating Temperature Ranges
UM 348 _EE_ _............................… ..… … … ......-40°C to +85°C
Storage Temperature Range ........… … … … ......-65°C to +160°C
Lead Temperature (soldering, 10sec) ...… … .… ..............+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not
implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC Electrical Characteristics
(V
CC
= 3.3V ±0.3V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C)
PARAMETER
Differential Driver Output
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)
Input High Voltage
Input Low Voltage
Logic Input Current
Input Current (A, B)
Receiver Differential
Threshold Voltage
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
Three-State (High Impedance)
Output Current at Receiver
Receiver Input Resistance
V
IH
V
IL
I
IN1
I
IN2
V
TH
V
TH
V
OH
V
OL
I
OZR
R
IN
DE = 0V,
V
CC
= 0V or 3.6V
-7V
V
CM
DE, DI, /RE
DE, DI, /RE
DE, DI, /RE
V
IN
= 12V
V
IN
= -7V
12V
-0.2
20
V
CC
- 0.4
0.4
1
96
2.0
0.8
2
1.0
-0.8
-0.05
V
V
μA
mA
V
mV
V
V
μA
k
V
OC
R
L
= 54 or 100 , Figure 2
0.2
V
V
OC
R
L
= 54 or 100 , Figure 2
2
V
V
OD
R
L
= 54 or 100 , Figure 2
0.2
V
SYMBOL
V
OD
R
L
= 60
CONDITIONS
R
L
= 54
(RS-485), Figure 2
(RS-485), V
CC
= 3.3V, Figure3
MIN
1.2
1.2
TYP
MAX UNITS
V
V
CM
= 0V
I
OUT
= -1.5mA, V
ID
= 200mV, Figure 4
I
OUT
= 2.5mA, V
ID
= 200mV, Figure 4
V
CC
= 3.6V, 0V
-7V
No load,
DI = 0V or V
CC
V
CM
V
OUT
12V
V
CC
Supply Voltage Range
Supply Current
Supply Current in Shutdown Mode
Driver Short-Circuit Output Current
Receiver Short-Circuit Output Current
V
CC
I
CC
I
SHDN
I
OSD
I
OSR
DE = V
CC
, /RE = 0V or V
CC
DE = 0V, /RE = 0V
V
OUT
= -7V
V
OUT
= 12V
0V
V
RO
V
CC
3.0
0.6
0.5
1.0
3.6
1.2
1.0
-250
250
V
mA
μA
mA
mA
DE = 0V, /RE = V
CC
, DI = V
CC
or 0V
8
60
ESD Protection for A, B
Human Body Model
IEC 1000-4-2 Air Discharge
±15
±15
kV
UM3483E,UM3486E Datasheet Rev.0.1, Dec.2005
Page 2 of 12
Union Semiconductor, Inc.
Receiver Switching Characteristics—UM3483E
(V
CC
= 3.3V, T
A
= +25°C)
PARAMETER
http://www.union-ic.com
SYMBOL
t
DD
t
TD
t
PLH
t
PHL
t
PDS
t
PZL
t
PZH
t
PHZ
t
PLZ
t
PSL
t
PSH
CONDITIONS
R
L
= 60 , Figure 5
R
L
= 60 , Figure 5
R
L
= 27 , Figure 6
R
L
= 27 , Figure 6
R
L
= 27 , Figure 6
R
L
= 110 , Figure 8
R
L
= 110 , Figure 7
R
L
= 110 , Figure 7
R
L
= 110 , Figure 8
R
L
= 110 , Figure 8
R
L
= 110 , Figure 7
MIN
0.5
600
400
700
700
TYP MAX
900
740
930
930
50
900
600
50
50
1.9
2.2
1300
800
80
80
2.7
3.0
1400
1200
1500
1500
UNITS
Mbps
ns
ns
ns
ns
ns
ns
ns
ns
ns
μ
s
μ
s
Maximum Data Rate
Driver Differential Output Delay
Driver Differential Output Transition Time
Driver Propagation Delay, Low-to-High Level
Driver Propagation Delay, High-to-Low Level
|t
PLH
- t
PHL
| Driver Propagation Delay Skew (Note 2)
DRIVER-OUTPUT ENABLE/DISABLE TIMES
Driver Output Enable Time to Low Level
Driver Output Enable Time to High Level
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
Receiver Switching Characteristics—UM3486E
(V
CC
= 3.3V, T
A
= +25°C)
PARAMETER
SYMBOL
t
DD
t
TD
t
PLH
t
PHL
t
PDS
t
PZL
t
PZH
t
PHZ
t
PLZ
t
PSL
t
PSH
CONDITIONS
R
L
= 60 , Figure 5
R
L
= 60 , Figure 5
R
L
= 27 , Figure 6
R
L
= 27 , Figure 6
R
L
= 27 , Figure 6
R
L
= 110 , Figure 18
R
L
= 110 , Figure 7
R
L
= 110 , Figure 7
R
L
= 110 , Figure 8
R
L
= 110 , Figure 8
R
L
= 110 , Figure 7
MIN
2.5
20
15
20
20
TYP MAX
42
28
42
42
-6
52
52
40
40
700
700
70
60
75
75
12
100
100
80
80
1000
1000
UNITS
Mbps
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Maximum Data Rate
Driver Differential Output Delay
Driver Differential Output Transition Time
Driver Propagation Delay, Low-to-High Level
Driver Propagation Delay, High-to-Low Level
|t
PLH
- t
PHL
| Driver Propagation Delay Skew (Note 2)
DRIVER-OUTPUT ENABLE/DISABLE TIMES
Driver Output Enable Time to Low Level
Driver Output Enable Time to High Level
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
UM3483E,UM3486E Datasheet Rev.0.1, Dec.2005
Page 3 of 12
Union Semiconductor, Inc.
Receiver Switching Characteristics
(V
CC
= +3.3V, T
A
= +25°C.)
http://www.union-ic.com
PARAMETER
Time to Shutdown
Receiver Propagation Delay,
Low-to-High Level
Receiver Propagation Delay,
High-to-Low Level
SYMBOL
t
SHDN
t
RPLH
CONDITIONS
UM3483E /UM3486E (Note 3)
V
ID
= 0 to 3.0V, C
L
= 15pF, Figure 9
UM3483E
V
ID
= 0 to 3.0V, C
L
= 15pF, Figure 9
UM3483E
MIN
80
25
25
25
25
TYP
190
62
75
62
75
6
12
25
25
25
25
720
720
MAX
300
90
120
90
120
±10
±20
50
50
45
45
1400
1400
UNITS
ns
ns
t
RPHL
ns
|
t
PLH
- t
PHL
|
Receiver
Propagation-Delay Skew
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
t
RPDS
V
ID
= 0 to 3.0V, C
L
= 15pF, Figure 9
UM3483E
C
L
= 15pF, Figure 10,
UM3483E /UM3486E
C
L
= 15pF, Figure 10,
UM3483E /UM3486E
C
L
= 15pF, Figure 10,
UM3483E /UM3486E
C
L
= 15pF, Figure 10,
UM3483E /UM3486E
C
L
= 15pF, Figure 12,
UM3483E /UM3486E
C
L
= 15pF, Figure 10,
UM3483E /UM3486E
ns
t
PRZL
t
PRZH
t
PRHZ
t
PRLZ
t
PRSL
t
PRSH
ns
ns
ns
ns
ns
ns
Note 1:
V
OD
and V
OC
are the changes in V
OD
and V
OC
, respectively, when the DI input changes state.
Note 2:
Measured on |tPLH (Y) - tPHL (Y)| and |tPLH (Z) - tPHL (Z)|.
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.
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25°C, unless otherwise noted.)
UM3483E,UM3486E Datasheet Rev.0.1, Dec.2005
Page 4 of 12
Union Semiconductor, Inc.
Typical Operating Characteristics (continued)
(V
CC
= 3.3V, T
A
= +25°C, unless otherwise noted.)
http://www.union-ic.com
UM3483E,UM3486E Datasheet Rev.0.1, Dec.2005
Page 5 of 12
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