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PDF UM3486E Data sheet ( Hoja de datos )
| Número de pieza | UM3486E | |
| Descripción | True RS-485 Transceivers | |
| Fabricantes | Union Semiconductor | |
| Logotipo |  |
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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
________________________________________________________________________
http://www.union-ic.com Rev.03 Dec.2014
1/18
1 page  
UM3483E/UM3486E
Driver Switching Characteristics (UM3483E)
(VCC = +3V to 5.5V, TA = +25°C.)
Parameter
Symbol Test Conditions
Min Typ Max Unit
Maximum Data Rate
fMAX
500 kbps
Driver Differential Output Delay
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)
tDD
tTD
tPLH
tPHL
tPDS
RL=60Ω, Figure 3
RL=60Ω, Figure 3
RL=27Ω, Figure 4
RL=27Ω, Figure 4
RL=27Ω, Figure 4
250
250
250
250
500 1000 ns
500 750 ns
550 1000 ns
550 1000 ns
10 30 ns
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
tPZL
tPZH
tPHZ
tPLZ
tPSL
tPSH
RL=110Ω, Figure 6
RL=110Ω, Figure 5
RL=110Ω, Figure 5
RL=110Ω, Figure 6
RL=110Ω, Figure 6
RL=110Ω, Figure 5
100 2500 ns
100 2500 ns
100 100 ns
100 100 ns
500 2500 ns
500 2500 ns
Driver Switching Characteristics (UM3486E)
(VCC = +3V to 5.5V, TA = +25°C.)
Parameter
Symbol Test Conditions
Maximum Data Rate
fMAX
Driver Differential Output Delay
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)
tDD
tTD
tPLH
tPHL
tPDS
RL=60Ω, Figure 3
RL=60Ω, Figure 3
RL=27Ω, Figure 4
RL=27Ω, Figure 4
RL=27Ω, Figure 4
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
tPZL
tPZH
tPHZ
tPLZ
tPSL
tPSH
RL=110Ω, Figure 6
RL=110Ω, Figure 5
RL=110Ω, Figure 5
RL=110Ω, Figure 6
RL=110Ω, Figure 6
RL=110Ω, Figure 5
Min
20
20
25
25
Typ
2500
50
50
55
55
2
60
60
60
60
500
500
Max Unit
kbps
100 ns
100 ns
100 ns
100 ns
10 ns
100 ns
100 ns
100 ns
100 ns
800 ns
800 ns
________________________________________________________________________
http://www.union-ic.com Rev.03 Dec.2014
5/18
5 Page 
UM3483E/UM3486E
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Symbol
RO
______
RE
DE
DI
GND
A
B
VCC
Function
Receiver Output. If A＞B by -50mV, RO will be high; if A＜B by
200mV, RO will be low.
______
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
______
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
Non-inverting Receiver Input and Non-inverting Driver Output
Inverting Receiver Input and Inverting Driver Output.
Positive Supply: 3.0V≤VCC≤5.5V
RS-485 Communication Function Table
Table1. Transmitting
INPUTS
OUTPUTS
______
RE
DE
DI
B
A
X1 1
0
1
X1 0
1
0
0 0 X High-Z High-Z
1 0 X High-Z
X=Don’t care; High-Z=High impedance
High-Z
MODE
Normal
Normal
Normal
Shutdown
Table2. Receiving
INPUTS
______
RE
DE
A, B
0 X >-50mV
0 X <-200mV
0 X Inputs Open
10
X
X=Don’t care; High-Z=High impedance
OUTPUTS
RO
1
0
1
High-Z
MODE
Normal
Normal
Normal
Shutdown
________________________________________________________________________
http://www.union-ic.com Rev.03 Dec.2014
11/18
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet UM3486E.PDF ] | |
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