®
SP483E
Enhanced Low EMI Half-Duplex
RS-485 Transceiver
s
+5V Only
s
Low Power BiCMOS
s
Driver/Receiver Enable for Multi-Drop
configurations
s
Enhanced ESD Specifications:
+15KV Human Body Model
+15KV IEC1000-4-2 Air Discharge
+8KV IEC1000-4-2 Contact Discharge
s
Low EMI Transceiver limited to 250kbps
Now Available in Lead Free Packaging
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
this device to over
±15kV
for both Human Body Model and IEC1000-4-2 Air Discharge
Method. This device is pin-to-pin compatible with
Sipex's SP483
device as well as popular
industry standards. As with the original version, the
SP483E
features
Sipex's
BiCMOS
design allowing low power operation without sacrificing performance. The
SP483E
meet the
requirements of the RS-485 and RS-422 protocols up to 250kbps under load. 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.
RO 1
RE 2
DE 3
DI 4
R
8 Vcc
7B
6A
D
SP483E
5 GND
SP483EDS/05
SP483E Low EMI Half-Duplex RS485 Transceiver
© Copyright 2000 Sipex Corporation
1
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
............................................................................................................+7V
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
SPECIFICATIONS
T
MIN
to T
MAX
and V
CC
= 5V
±
5% unless otherwise noted.
PARAMETERS
SP483E DRIVER
DC Characteristics
Differential Output Voltage
Differential Output Voltage
MIN.
TYP.
MAX.
UNITS
CONDITIONS
GND
2
V
CC
V
CC
V
CC
0.2
3
0.8
10µA
1µA
±250
±250
Volts
Volts
Volts
Volts
Volts
Volts
Volts
Differential Output Voltage
1.5
Change in Magnitude of Driver
Differential Output Voltage for
Complimentary States
Driver Common-Mode
Output Voltage
Input High Voltage
2.0
Input Low Voltage
Input Current
Driver Input
Control Lines
Driver Short-Circuit Current
V
OUT
= HIGH
V
OUT
= LOW
SP483E DRIVER
AC Characteristics
Maximum Data Rate
250
Driver Input to Output
Driver Input to Output
Driver Skew
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
SP481E/SP485E 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
SP483EDS/05
Unloaded; R =
∞
;
see Figure 1
with load; R = 50Ω; (RS-422);
see Figure 1
with load; R = 27Ω; (RS-485);
see Figure 1
R = 27Ω or R = 50Ω;
see Figure 1
R = 27Ω or R = 50Ω;
see Figure 1
Applies to DE, DI, RE
Applies to DE, DI, RE
Applies to DE, DI, RE
DI
DE, RE
-7V
≤
V
O
≤
+12V
-7V
≤
V
O
≤
+12V
mA
mA
Kbps
800
800
100
2000
2000
800
2000
2000
2000
3000
3000
ns
ns
ns
ns
ns
ns
ns
ns
250
250
250
250
250
300
300
RE = 5V, DE = 5V; R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF
t
PLH
; R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF;
see Figures 3 and 5
t
PHL
; R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF;
see Figures 3 and 5
see Figures 3 and 5,
t
SKEW
= | t
DPLH
- t
DPHL
|
From 10% to 90%; R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF;
see
Figures 3 and
6
C
L
=
C
L
=
C
L
=
C
L
=
100pF;
see Figures 4 & 6;
S
2
closed
100pF;
see Figures 4 & 6;
S
1
closed
15pF;
see Figures 2 & 8;
S
1
closed
15pF;
see Figures 2 & 8;
S
2
closed
-0.2
20
3.5
+0.2
0.4
±1
Volts
mV
Volts
Volts
µA
kΩ
mA
mA
mA
-7V
≤
V
CM
≤
+12V
V
CM
= 0V
I
O
= -4mA, V
ID
= +200mV
I
O
= +4mA, V
ID
= -200mV
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
CM
≤
V
CC
© Copyright 2000 Sipex Corporation
12
7
15
+1.0
-0.8
95
SP483E Low EMI Half-Duplex RS485 Transceiver
2
SPECIFICATIONS
(continued)
T
MIN
to T
MAX
and V
CC
= 5V
±
5% unless otherwise noted.
PARAMETERS
SP483E RECEIVER
AC Characteristics
Maximum Data Rate
Receiver Input to Output
Receiver Input to Output
Diff. Receiver Skew It
PLH
-t
PHL
I
Receiver Enable to
Output Low
Receiver Enable to
Output High
Receiver Disable from Low
Receiver Disable from High
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
Supply Current
SP483E
No Load
SP483E
Shutdown Mode
ENVIRONMENTAL AND
MECHANICAL
Operating Temperature
Commercial (_C_)
Industrial (_E_)
Storage Temperature
Package
Plastic DIP (_P)
NSOIC (_N)
MIN.
TYP.
MAX.
UNITS
CONDITIONS
250
250
250
100
45
45
45
45
2000
2000
Kbps
ns
ns
ns
RE = 0V, DE = 0V
t
PLH
; R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF;
Figures 3 & 7
t
PHL
; R
DIFF
= 54Ω,
C
L1
= C
L2 =
100pF;
Figures 3 & 7
R
DIFF
= 54Ω; C
L1
= C
L2
= 100pF;
Figures 3 & 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
70
70
70
70
ns
ns
ns
ns
50
200
600
2000
2000
ns
ns
ns
ns
ns
RE = 5V, DE = 0V
C
L
= 100pF;
See Figures 4 & 6;
S
2
closed
C
L
= 100pF;
See Figures 4 & 6;
S
1
closed
C
L
= 15pF;
See Figures 2 & 8;
S
2
closed
C
L
= 15pF;
See Figures 2 & 8;
S
1
closed
300
300
2500
2500
+4.75
900
600
+5.25
Volts
µA
µA
RE = 0V, DI = 0V or V
CC
; DE = V
CC
RE = 0V, DI = 0V or 5V; DE = 0V
DE = 0V, RE=V
CC
10
µA
0
-40
-65
+70
+85
+150
°C
°C
°C
SP483EDS/05
SP483E Low EMI Half-Duplex RS485 Transceiver
© Copyright 2000 Sipex Corporation
3
PIN FUNCTION
RO 1
R
8
V
CC
Pin 1 – RO – Receiver Output.
Pin 2 – RE – Receiver Output Enable Active LOW.
RE 2
7
B
Pin 3 – DE – Driver Output Enable Active HIGH.
Pin 4 – DI – Driver Input.
Pin 5 – GND – Ground Connection.
DE 3
6
A
D
DI 4
SP485
Top View
5
GND
Pin 6 – A – Driver Output/Receiver Input
Non-inverting.
Pin 7 – B – Driver Output/Receiver Input Inverting.
Pin 8 – Vcc – Positive Supply 4.75V<Vcc< 5.25V.
SP483E
Pinout (Top View)
A
R
V
OD
R
B
Figure 1. RS-485 Driver DC Test Load Circuit
V
OC
Receiver
Output
Test Point
C
RL
1k
S
1
1k
V
CC
S
2
Figure 2. Receiver Timing Test Load Circuit
DI
A
B
C
L1
R
DIFF
C
L2
A
B
RO
15pF
Output
Under C
L
Test
500
S
1
V
CC
S
2
Figure 4. RS-485 Driver Timing Test Load #2 Circuit
Figure 3. RS-485 Driver/Receiver Timing Test Circuit
+3V
DI
0V
DRIVER
OUTPUT
B
A
f = 100kHz; t
R
< 10ns; t
F
< 10ns
1.5V
t
PLH
V
O
1/2V
O
t
DPLH
t
DPHL
t
PHL
1/2V
O
1.5V
DIFFERENTIAL V
O
+
OUTPUT 0V
V
A
– V
B
V
O
–
t
SKEW =
| t
DPLH -
t
DPHL
|
Figure 5. Driver Propagation Delays
SP483EDS/05
t
R
t
F
SP483E Low EMI Half-Duplex RS485 Transceiver
© Copyright 2000 Sipex Corporation
4
INPUTS
RE
X
X
X
X
DE
1
1
0
1
DI
1
0
X
X
LINE
CONDITION
No Fault
No Fault
X
Fault
OUTPUTS
B
0
1
Z
Z
A
1
0
Z
Z
INPUTS
RE
DE
0
0
0
0
0
0
1
0
OUTPUTS
A-B
R
+0.2V
1
-0.2V
0
Inputs Open
1
X
Z
Table 2. Receive Function Truth Table
Table 1. Transmit Function Truth Table
+3V
DE
0V
5V
A, B
V
OL
V
OH
A, B
0V
f = 100kHz; t
R
< 10ns; t
F
< 10ns
1.5V
t
ZL
2.3V
Output normally LOW
1.5V
t
LZ
0.5V
0.5V
t
HZ
2.3V
t
ZH
Output normally HIGH
Figure 6. Driver Enable and Disable Times
V
0D2
+
A–B
V
0D2
–
V
OH
R
V
OL
t
PHL
0V
INPUT
0V
1.5V
OUTPUT
1.5V
t
PLH
f = 100kHz; t
R
< 10ns; t
F
< 10ns
t
SKEW =
| t
PHL -
t
PLH
|
Figure 7. Receiver Propagation Delays
+3V
RE
0V
5V
R
V
IL
V
IH
R
0V
1.5V
f = 100kHz; t
R
< 10ns; t
F
< 10ns
1.5V
t
ZL
1.5V
Output normally LOW
t
LZ
0.5V
0.5V
t
HZ
1.5V
t
ZH
Output normally HIGH
Figure 8. Receiver Enable and Disable Times
SP483EDS/05
SP483E Low EMI Half-Duplex RS485 Transceiver
© Copyright 2000 Sipex Corporation
5
