SP483E
Enhanced Low EMI Half-Duplex
RS-485 Transceiver
Description
The
SP483E
is a half-duplex transceiver that meets the
specifications of RS-485 and RS-422 serial protocols with enhanced
ESD performance. The ESD tolerance has been improved on
these devices to over ±15kV for both Human Body Model and
IEC61000-4-2 Air Discharge Method. This device is pin-to-pin
compatible with MaxLinear’s SP483 device as well as popular
industry standards. As with the original versions, the SP483E feature
MaxLinear’s BiCMOS design allowing low power operation without
sacrificing performance. The SP483E is internally slew rate limited to
reduce EMI and can meet the requirements of RS-485 and RS-422 up
to 250kbps. The SP483E is also equipped with a low power shutdown
mode.
FEATURES
■■
5V only
■■
Low power BiCMOS
■■
Driver / receiver enable for multi-drop
configurations
■■
Enhanced ESD specifications:
±15kV Human Body Model
±15kV IEC61000-4-2 Air Discharge
±8kV IEC61000-4-2 Contact
Discharge
■■
Low EMI transceiver limited to 250kbps
■■
Low power 1µA shutdown mode
Ordering Information -
Back Page
Block Diagram
RO 1
RE 2
DE 3
DI 4
D
R
8 VCC
7 B
6 A
5 GND
SP483E
REV 1.0.1
1/11
SP483E
Absolute Maximum Ratings
These are stress ratings only and functional operation of the
device at these ratings or any other above those indicated
in the operation sections of the specifications below is not
implied. Exposure to absolute maximum rating conditions
for extended periods of time may affect reliability.
V
CC
............................................................................... 7.0V
Input Voltages
Logic ........................ -0.3V to (V
CC
+ 0.5V)
Drivers ..................... -0.3V to (V
CC
+ 0.5V)
Receivers ........................................... ±15V
Output Voltages
Logic ........................ -0.3V to (V
CC
+ 0.5V)
Drivers ............................................... ±15V
Receivers..................-0.3V to (V
CC
+ 0.5V)
Storage Temperature .................................-65˚C to +150˚C
Power Dissipation .................................................... 500mW
Electrical Characteristics
T
AMB
= T
MIN
to T
MAX
and V
CC
= 5V ±5% unless otherwise noted.
PARAMETERS
SP483E Driver DC Characteristics
Differential output voltage
Differential output voltage
Differential output voltage
Change in magnitude of driver
differential output voltage for
complimentary states
Driver common-mode output voltage
Input high voltage
Input low voltage
Input current, driver input
Input current, control lines
Driver short circuit current
V
OUT
= HIGH
Driver short circuit current
V
OUT
= LOW
2.0
0.8
10
1
±250
±250
2
1.5
V
CC
V
CC
V
CC
0.2
3
V
V
V
V
V
V
V
µA
µA
mA
mA
Unloaded; R = ∞Ω ; Figure 1
With load; R = 50Ω (RS-422); Figure 1
With load; R = 27Ω (RS-485); Figure 1
R = 27Ω or R = 50Ω; Figure 1
R = 27Ω or R = 50Ω; Figure 1
Applies to DE, DI, RE
Applies to DE, DI, RE
Applies to,DI
Applies to,DE, RE
-7V ≤ V
O
≤ 12V
-7V ≤ V
O
≤ 12V
MIN.
TYP.
MAX.
UNITS
CONDITIONS
REV 1.0.1
2/11
SP483E
Electrical Characteristics (Continued)
T
AMB
= T
MIN
to T
MAX
and V
CC
= 5V ±5% unless otherwise noted.
PARAMETERS
SP483E Driver AC Characteristics
Maximum data rate
Driver input to output, t
PLH
Driver input to output, t
PHL
Driver skew
Driver rise or fall time
Driver enable to output high
Driver enable to output low
Driver disable time from high
Driver disable time from low
SP483E Receiver DC Characteristics
Differential input threshold
Input hysteresis
Output voltage HIGH
Output voltage LOW
Three-state ( high impedance) output
current
Input resistance
Input current (A, B); V
IN
= 12V
Input current (A, B); V
IN
= -7V
Short circuit current
SP483E Receiver AC Characteristics
Maximum data rate
Receiver input to output
Receiver input to output
Differential receiver skew
|t
PHL
- t
PLH
|
Receiver enable to output low
Receiver enable to output high
Receiver Disable from low
Receiver Disable from high
250
250
250
100
45
45
45
45
70
70
70
70
2000
2000
kbps
ns
ns
ns
ns
ns
ns
ns
RE = 0V, DE = 0V
t
PLH ;
See Figures 3 & 7,
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
t
PHL ;
See Figures 3 & 7,
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF,
See Figures 3 and 7
C
RL
= 15pF, Figures 2 & 8; S
1
Closed
C
RL
= 15pF, Figures 2 & 8; S
2
Closed
C
RL
= 15pF, Figures 2 & 8; S
1
Closed
C
RL
= 15pF, Figures 2 & 8; S
2
Closed
7
12
15
1.0
-0.8
95
3.5
0.4
±1
-0.2
20
0.2
Volts
mV
Volts
Volts
µA
kΩ
mA
mA
mA
-7V ≤ V
CM
≤ 12V
V
CM
= 0V
V
ID
= 200mV, I
O
= -4mA
V
ID
= 200mV, I
O
= 4mA
0.4V ≤ V
O
≤ 2.4V; RE = 5V
-7V ≤ V
CM
≤ 12V
DE = 0V, V
CC
= 0V or 5.25V, V
IN
= 12V
DE = 0V, V
CC
= 0V or 5.25V, V
IN
= -7V
0V ≤ V
O
≤ V
CC
250
250
250
300
300
250
250
250
800
800
100
2000
2000
800
2000
2000
2000
3000
3000
kbps
ns
ns
ns
ns
ns
ns
ns
ns
RE = 5V, DE = 5V; R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
See Figures 3 & 5, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
See Figures 3 & 5, R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
See Figures 3 and 5, t
SKEW
= |t
DPHL
- t
DPLH
|
From 10%-90%; R
DIFF
= 54Ω
C
L1
= C
L2
= 100pF; See Figures 3 and 6
C
L
= 100pF, See Figures 4 and 6, S
2
closed
C
L
= 100pF, See Figures 4 and 6, S
1
closed
C
L
= 15pF, See Figures 4 and 6, S
2
closed
C
L
= 15pF, See Figures 4 and 6, S
1
closed
MIN.
TYP.
MAX.
UNITS
CONDITIONS
REV 1.0.1
3/11
SP483E
Electrical Characteristics, Continued
T
AMB
= T
MIN
to T
MAX
and V
CC
= 5V ±5% unless otherwise noted
PARAMETERS
SP483E Shutdown Timing
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
Power Requirements
Supply voltage V
CC
Supply current
No load
Shutdown mode
Environmental and Mechanical
Operating Temperture
Commercial (_C_)
Industrial (_E_)
Storage Temperature
Package
NSOIC (_N)
0
-40
-65
70
85
150
°C
°C
°C
900
600
1
10
µA
µA
µA
RE, DI = 0V or V
CC
; DE = V
CC
RE = 0V, DI = 0V or 5V; DE = 0V
DE = 0V, RE = V
CC
4.75
5.25
Volts
300
300
50
200
600
2000
2000
2500
2500
ns
ns
ns
ns
ns
RE = 5V, DE = 0V
C
L
= 100pF; See Figures 4 and 6; S
2
Closed
C
L
= 100pF; See Figures 4 and 6; S
1
Closed
C
L
= 15pF; See Figures 2 and 8; S
2
Closed
C
L
= 15pF; See Figures 2 and 8; S
1
Closed
MIN.
TYP.
MAX.
UNITS
CONDITIONS
Pin Functions
Pin Number
Pin Name
Description
Receiver output
Receiver output enable active LOW
Driver output enable active HIGH
Driver input
Ground connection
Non-inverting driver output /
receiver input
Inverting driver output /
receiver input
Positive supply 4.75V ≤ Vcc ≤ 5.25V
1
RO
RE
DE
DI
GND
A
B
VCC
RO 1
RE 2
DE 3
DI 4
D
R
8 VCC
7 B
6 A
5 GND
2
3
4
5
6
7
SP483E
Pinout (Top View)
8
REV 1.0.1
4/11
SP483E
Test Circuits
A
R
V
OD
R
B
Figure 1: RS-485 Driver DC Test Load Circuit
Receiver
Output
Test Point
S
1
C
RL
1kΩ
S
2
1kΩ
V
CC
V
OC
Figure 2: Receiver Timing Test Load Circuit
DI
A
B
C
L1
R
DIFF
C
L2
A
B
RO
15pF
Output
Under
Test
500Ω
C
L
S
1
V
CC
S
2
Figure 3: RS-485 Driver/Receiver Timing Test Circuit
Figure 4: Driver Timing Test Load #2 Circuit
Switching Waveforms
f = 100kHz; t
R
≤ 10ns; t
F
≤ 10ns
DRIVER INPUT
+3V
0V
B
A
V
O
1/2V
O
t
DPLH
t
DPHL
1.5V
t
PLH
t
PHL
1/2V
O
1.5V
DRIVER
OUTPUT
DIFFERENTIAL V
O
+
OUTPUT 0V
V
A
– V
B
V
O
–
t
SKEW
= |t
DPLH
- t
DPHL
|
t
R
t
F
Figure 5: Driver Propagation Delays
REV 1.0.1
5/11
Microcontroller MCU
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