1
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
Copyright 2000 Sipex Corporation
SP490E/SP491E
Enhanced Full Duplex RS-485 Transceivers
s
+5V Only
s
Low Power BiCMOS
s
Driver/Receiver Enable (SP491E)
s
RS-485 and RS-422 Drivers/Receivers
s
Pin Compatible with LTC490 and
SN75179 (SP490E)
s
Pin Compatible with LTC491 and
SN75180 (SP491E)
s
Improved ESD Specifications:
15kV Human Body Model
15kV IEC1000-4-2 Air Discharge
8kV IEC1000-4-2 Contact Discharge
DESCRIPTION...
The SP490E is a low power differential line driver/receiver meeting RS-485 and RS-422
standards up to 10Mbps. The SP491E is identical to the SP490E with the addition of driver
and receiver tri-state enable lines. Both products feature
200mV receiver input sensitivity,
over wide common mode range. The SP490E is available in 8-pin plastic DIP and 8-pin NSOIC
packages for operation over the commercial and industrial temperature ranges. The SP491E
is available in 14-pin DIP and 14-pin NSOIC packages for operation over the commercial and
industrial temperature ranges.
6
1
2
3
4
5
7
8
Vcc
GND
R
D
A
B
Z
Y
R
D
9
10
11
12
13
14
NC
REB
DE
GND
NC
NC
1
2
3
4
5
6
7
8
R
D
Vcc
GND
R
D
A
B
Z
Y
SP490E
SP491E
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
Copyright 2000 Sipex Corporation
2
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
Drivers................................................-0.5V to (V
CC
+0.5V)
Receivers..................................................................
14V
Output Voltages
Drivers......................................................................
14V
Receivers...........................................-0.5V to (V
CC
+0.5V)
Storage Temperature....................................................-65C to +150
Power Dissipation.....................................................................1000mW
SPECIFICATIONS
T
MIN
to T
MAX
and V
CC
= 5V
5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX.
UNITS
CONDITIONS
SP490E DRIVER
DC Characteristics
Differential Output Voltage
GND
V
CC
Volts
Unloaded; R =
;
see Figure 1
Differential Output Voltage
2
V
CC
Volts
With Load; R = 50
; (RS-422);
see Figure 1
Differential Output Voltage
1.5
V
CC
Volts
With Load; R = 27
; (RS-485);
see Figure 1
Change in Magnitude of Driver
Differential Output Voltage for
Complimentary States
0.2
Volts
R = 27
or R = 50
;
see Figure 1
Driver Common-Mode
Output Voltage
3
Volts
R = 27
or R = 50
;
see Figure 1
Input High Voltage
2.0
Volts
Applies to D
Input Low Voltage
0.8
Volts
Applies to D
Input Current
10
A
Applies to D
Driver Short-Circuit Current
V
OUT
= HIGH
250
mA
-7V
V
O
+12V
V
OUT
= LOW
250
mA
-7V
V
O
+12V
SP490E DRIVER
AC Characteristics
Maximum Data Rate
10
Mbps
R
DIFF
= 54
, C
L1
= C
L2
= 100pF
Driver Input to Output
20
30
60
ns
t
PLH
; R
DIFF
= 54
, C
L1
= C
L2
= 100pF;
see Figures 3 and 6
Driver Input to Output
20
30
60
ns
t
PHL
; R
DIFF
= 54
, C
L1
= C
L2
= 100pF;
see Figures 3 and 5
Driver Skew
5
ns
see Figures 3 and 5,
t
SKEW
= | t
DPLH
- t
DPHL
|
Driver Rise or Fall Time
3
15
40
ns
From 10% to 90%; R
DIFF
= 54
,
C
L1
= C
L2
= 100pF;
see Figures 3 and 5
SP490E RECEIVER
DC Characteristics
Differential Input Threshold
-0.2
+0.2
Volts
-7V
V
CM
12V
Input Hysteresis
70
mV
V
CM
= 0V
Output Voltage High
3.5
Volts
I
O
= -4mA, V
ID
= +200mV
Output Voltage Low
0.4
Volts
I
O
= +4mA, V
ID
= -200mV
Input Resistance
12
15
k
-7V
V
CM
12V
Input Current (A, B); V
IN
= 12V
1.0
mA
V
IN
= 12V
Input Current (A, B); V
IN
= -7V
-0.8
mA
V
IN
= -7V
Short-Circuit Current
85
mA
0V
V
O
V
CC
3
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
Copyright 2000 Sipex Corporation
SPECIFICATIONS (continued)
T
MIN
to T
MAX
and V
CC
= 5V
5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX.
UNITS
CONDITIONS
SP490E RECEIVER
AC Characteristics
Maximum Data Rate
10
Mbps
Receiver Input to Output
20
45
100
ns
t
PLH
; R
DIFF
= 54
,
C
L1
= C
L2
=
100pF;
Figures 3 & 7
Receiver Input to Output
20
45
100
ns
t
PHL
; R
DIFF
= 54
,
C
L1
= C
L2
=
100pF;
Figures 3 & 7
Diff. Receiver Skew It
PLH
-t
PHL
I
13
ns
R
DIFF
= 54
; C
L1
= C
L2
= 100pF;
Figures 3 & 7
POWER REQUIREMENTS
Supply Voltage
+4.75
+5.25
Volts
Supply Current
900
A
ENVIRONMENTAL AND
C
L1
15pF
RO
A
B
A
B
DI
DE
3V
C
L2
R
DIFF
500
C
L
Output
Under
Test
S
1
S
2
V
CC
Figure 3. Driver/Receiver Timing Test Circuit
Figure 4. Driver Timing Test Load #2 Circuit
A
B
R
R
V
OD
V
OC
1k
1k
C
RL
Receiver
Output
S
1
S
2
Test Point
V
CC
Figure 1. Driver DC Test Load Circuit
Figure 2. Receiver Timing Test Load Circuit
MECHANICAL
Operating Temperature
Commercial (_C_)
0
+70
C
Industrial (_E_)
-40
+85
C
Storage Temperature
-65
+150
C
Package
Plastic DIP (_P)
NSOIC (_N)
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
Copyright 2000 Sipex Corporation
4
Figure 5. Driver Propagation Delays
+3V
0V
DE
5V
V
OL
A, B
0V
1.5V
1.5V
t
ZL
t
ZH
f = 1MHz; t
R
< 10ns; t
F
< 10ns
V
OH
A, B
2.3V
2.3V
t
LZ
t
HZ
0.5V
0.5V
Output normally LOW
Output normally HIGH
Figure 6. Driver Enable and Disable Times
Figure 7. Receiver Propagation Delays
Y, Z
Y, Z
+3V
0V
DI
Z
Y
DRIVER
OUTPUT
V
O
+
DIFFERENTIAL
OUTPUT
V
Y
V
Z
0V
V
O
1.5V
1.5V
t
PLH
t
R
t
F
f = 1MHz; t
R
< 10ns; t
F
< 10ns
V
O
1/2V
O
1/2V
O
t
PHL
t
DPLH
t
DPHL
t
SKEW =
|
t
DPLH -
t
DPHL
|
V
OH
V
OL
R
1.5V
1.5V
t
PHL
f = 1MHz; t
R
< 10ns; t
F
< 10ns
OUTPUT
V
0D2
+
V
0D2
Y Z
0V
0V
t
PLH
INPUT
t
SKEW =
|
t
PHL -
t
PLH
|
5
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
Copyright 2000 Sipex Corporation
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...................................................-0.5V to (V
CC
+0.5V)
Drivers................................................-0.5V to (V
CC
+0.5V)
Receivers..................................................................
14V
Output Voltages
Logic...................................................-0.5V to (V
CC
+0.5V)
Drivers......................................................................
14V
Receivers...........................................-0.5V to (V
CC
+0.5V)
Storage Temperature......................................................-65C to +150
Power Dissipation.....................................................................1000mW
SPECIFICATIONS
T
MIN
to T
MAX
and V
CC
= 5V
5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX.
UNITS
CONDITIONS
SP491E DRIVER
DC Characteristics
Differential Output Voltage
GND
V
CC
Volts
Unloaded; R =
;
see Figure 1
Differential Output Voltage
2
V
CC
Volts
With Load; R = 50
; (RS-422);
see Figure 1
Differential Output Voltage
1.5
V
CC
Volts
With Load; R = 27
; (RS-485);
see Figure 1
Change in Magnitude of Driver
Differential Output Voltage for
Complimentary States
0.2
Volts
R = 27
or R = 50
;
see Figure 1
Driver Common-Mode
Output Voltage
3
Volts
R = 27
or R = 50
;
see Figure 1
Input HIGH Voltage
2.0
Volts
Applies to D, REB, DE
Input LOW Voltage
0.8
Volts
Applies to D, REB, DE
Input Current
10
A
Applies to D, REB, DE
Driver Short-Circuit Current
V
OUT
= HIGH
250
mA
-7V
V
O
10V
V
OUT
= LOW
250
mA
-7V
V
O
10V
SP491E DRIVER
AC Characteristics
Maximum Data Rate
10
Mbps
R
DIFF
= 54
, C
L1
= C
L2
= 100pF
Driver Input to Output
20
30
60
ns
t
PLH
; R
DIFF
= 54
, C
L1
= C
L2
= 100pF;
see Figures 3 and 5
Driver Input to Output
20
30
60
ns
t
PHL
; R
DIFF
= 54
, C
L1
= C
L2
= 100pF;
see Figures 3 and 5
Driver Skew
5
10
ns
see Figures 3 and 5,
t
SKEW
= | t
DPLH
- t
DPHL
|
Driver Rise or Fall Time
3
15
40
ns
From 10% to 90%; R
DIFF
= 54
,
C
L1
= C
L2
= 100pF;
see Figures 3 and 5
Driver Enable to Output HIGH
40
70
ns
C
L1
= C
L2
= 100pF;
see Figures
4 and 6; S
2
closed
Driver Enable to Output LOW
40
70
ns
C
L1
= C
L2
= 100pF;
see Figures
4 and 6; S
1
closed
Driver Disable Time from LOW
40
70
ns
C
L1
= C
L2
= 15pF;
see Figures
4 and 6; S
1
closed
Driver Disable Time from HIGH
40
70
ns
C
L1
= C
L2
= 15pF;
see Figures
4 and 6; S
2
closed
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
Copyright 2000 Sipex Corporation
6
SPECIFICATIONS (continued)
T
MIN
to T
MAX
and V
CC
= 5V
5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
MAX.
UNITS
CONDITIONS
SP491E RECEIVER
DC Characteristics
Differential Input Threshold
-0.2
+0.2
Volts
-7V
V
CM
12V
Input Hysteresis
70
mV
V
CM
= 0V
Output Voltage HIGH
3.5
Volts
I
O
= -4mA, V
ID
= +200mV
Output Voltage LOW
0.4
Volts
I
O
= +4mA, V
ID
= -200mV
Three State (high impedance)
Output Current
1
A
0.4V
V
O
2.4V; REB = 5V
Input Resistance
12
15
k
-7V
V
CM
12V
Input Current (A, B); V
IN
= 12V
1.0
mA
DE = 0V, V
CC
= 0V or 5.25V, V
IN
= 12V
Input Current (A, B); V
IN
= -7V
-0.8
mA
DE = 0V, V
CC
= 0V or 5.25V, V
IN
= -7V
Short-Circuit Current
85
mA
0V
V
O
V
CC
SP491E RECEIVER
AC Characteristics
Maximum Data Rate
10
Mbps
REB = 0V, DE = 5V
Receiver Input to Output
20
45
100
ns
t
PLH
; R
DIFF
= 54
,
C
L1
= C
L2
=
100pF;
Figures 3 & 7
Receiver Input to Output
20
45
100
ns
t
PHL
; R
DIFF
= 54
,
C
L1
= C
L2
=
100pF;
Figures 3 & 7
Diff. Receiver Skew It
PLH
-t
PHL
I
13
ns
R
DIFF
= 54
; C
L1
= C
L2
= 100pF;
Figures 3 & 7
Receiver Enable to Output LOW
45
70
ns
C
RL
= 15pF;
Figures 2 and 8; S
1
closed
Receiver Enable to Output HIGH
45
70
ns
C
RL
= 15pF;
Figures 2 and 8; S
2
closed
Receiver Disable from LOW
45
70
ns
C
RL
= 15pF;
Figures 2 and 8; S
1
closed
Receiver Disable from HIGH
45
70
ns
C
RL
= 15pF;
Figures 2 and 8; S
2
closed
POWER REQUIREMENTS
Supply Voltage
+4.75
+5.25
Volts
Supply Current
900
A
REB, D = 0V or V
CC
; DE = V
CC
SP491E ENVIRONMENTAL
+3V
0V
RE
5V
R
0V
1.5V
1.5V
t
ZL
t
ZH
f = 1MHz; t
R
< 10ns; t
F
< 10ns
R
1.5V
1.5V
t
LZ
t
HZ
0.5V
0.5V
Output normally LOW
Output normally HIGH
V
IL
V
IH
Figure 8. Receiver Enable and Disable Times
AND MECHANICAL
Operating Temperature
Commercial (_C_)
0
+70
C
Industrial (_E_)
-40
+85
C
Storage Temperature
-65
+150
C
Package
Plastic DIP (_P)
NSOIC (_N)
7
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
Copyright 2000 Sipex Corporation
FEATURES
The SP490E and SP491E are full-duplex dif-
ferential transceivers that meet the requirements
of RS-485 and RS-422. Fabricated with a Sipex
proprietary BiCMOS process, both products
require a fraction of the power of older bipolar
designs.
THEORY OF OPERATION
The RS-485 standard is ideal for multi-drop
applications or for long-distance interfaces.
RS-485 allows up to 32 drivers and 32 receivers
to be connected to a data bus, making it an ideal
choice for multi-drop applications. Since the
cabling can be as long as 4,000 feet, RS-485
transceivers are equipped with a wide (-7V to
+12V) common mode range to accommodate
ground potential differences. Because RS-485
is a differential interface, data is virtually
immune to noise in the transmission line.
Drivers
The drivers for both the SP490E and SP491E
have differential outputs. The typical voltage
output swing with no load will be 0 volts to +5
volts. With worst case loading of 54
across the
differential outputs, the driver can maintain
greater than 1.5V voltage levels.
The driver of the SP491E has a driver enable
control line which is active high. A logic high on
DE (pin 4) of the SP491E will enable the differ-
ential driver outputs. A logic low on DE (pin 4)
of the SP491E will tri-state the driver outputs.
The SP490E does not have a driver enable.
Receivers
The receivers for both the SP490E and SP491E
have differential inputs with an input sensitivity
as low as
200mV. Input impedance of the
receivers is typically 15k
(12k
minimum).
A wide common mode range of -7V to +12V
allows for large ground potential differences
between systems. The receivers for both the
SP490E and SP491E are equipped with the
fail-safe feature. Fail-safe guarantees that
the receiver output will be in a high state when
the input is left unconnected.
The receiver of the SP491E has a receiver
enable control line which is active low. A logic
low on REB (pin 3) of the SP491E will enable
the differential receiver. A logic high on REB
(pin 3) of the SP491E will tri-state the receiver.
ESD Tolerance
The SP490E/SP491E devices incorporate
ruggedized ESD cells on all driver output
and receiver input pins. The ESD structure is
improved over our previous family for more
rugged applications and environments sensitive
to electro-static discharges and associated
transients. The improved ESD tolerance is at
least
15kV without damage nor latch-up.
R
R
C
C
C
C
S
S
R
R
S
S
SW1
SW1
SW2
SW2
R
C
Device
Under
Test
DC Power
Source
C
S
R
S
SW1
SW2
Figure 9. ESD Test Circuit for Human Body Model
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
Copyright 2000 Sipex Corporation
8
There are different methods of ESD testing
applied:
a) MIL-STD-883, Method 3015.7
b) IEC1000-4-2 Air-Discharge
c) IEC1000-4-2 Direct Contact
The Human Body Model has been the generally
accepted ESD testing method for semiconductors.
This method is also specified in MIL-STD-883,
Method 3015.7 for ESD testing. The premise of
this ESD test is to simulate the human body's
potential to store electro-static energy and
discharge it to an integrated circuit. The
simulation is performed by using a test model as
shown in Figure 9. This method will test the IC's
capability to withstand an ESD transient during
normal handling such as in manufacturing areas
where the ICs tend to be handled frequently.
The IEC-1000-4-2, formerly IEC801-2, is
generally used for testing ESD on equipment and
systems. For system manufacturers, they must
guarantee a certain amount of ESD protection
since the system itself is exposed to the outside
environment and human presence. The premise
with IEC1000-4-2 is that the system is required
to withstand an amount of static electricity when
ESD is applied to points and surfaces of the
R
RS
S and
and R
RV
V add up to 330
add up to 330
f
for IEC1000-4-2.
or IEC1000-4-2.
RS and RV add up to 330
for IEC1000-4-2.
Contact-Discharge Module
Contact-Discharge Module
R
R
V
V
R
R
C
C
C
C
S
S
R
R
S
S
SW1
SW1
SW2
SW2
R
C
Device
Under
Test
DC Power
Source
C
S
R
S
SW1
SW2
R
V
Contact-Discharge Module
Figure 10. ESD Test Circuit for IEC1000-4-2
Figure 11. ESD Test Waveform for IEC1000-4-2
t=0ns
t=30ns
0A
15A
30A
t
i
equipment that are accessible to personnel during
normal usage. The transceiver IC receives most
of the ESD current when the ESD source is
applied to the connector pins. The test circuit for
IEC1000-4-2 is shown on Figure 10. There are
two methods within IEC1000-4-2, the Air
Discharge method and the Contact Discharge
method.
With the Air Discharge Method, an ESD voltage
is applied to the equipment under test (EUT)
through air. This simulates an electrically charged
9
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
Copyright 2000 Sipex Corporation
person ready to connect a cable onto the rear of
the system only to find an unpleasant zap just
before the person touches the back panel. The
high energy potential on the person discharges
through an arcing path to the rear panel of the
system before he or she even touches the system.
This energy, whether discharged directly or
through air, is predominantly a function of the
discharge current rather than the discharge
voltage. Variables with an air discharge such as
approach speed of the object carrying the ESD
potential to the system and humidity will tend to
change the discharge current. For example, the
rise time of the discharge current varies with the
approach speed.
The Contact Discharge Method applies the ESD
current directly to the EUT. This method was
devised to reduce the unpredictability of the
ESD arc. The discharge current rise time is
constant since the energy is directly transferred
without the air-gap arc. In situations such as
hand held systems, the ESD charge can be directly
discharged to the equipment from a person already
holding the equipment. The current is transferred
on to the keypad or the serial port of the equipment
directly and then travels through the PCB and
finally to the IC.
The circuit models in Figures 9 and 10 represent
the typical ESD testing circuits used for all three
methods. The C
S
is initially charged with the DC
power supply when the first switch (SW1) is on.
Now that the capacitor is charged, the second
switch (SW2) is on while SW1 switches off. The
voltage stored in the capacitor is then applied
through R
S
, the current limiting resistor, onto the
device under test (DUT). In ESD tests, the SW2
switch is pulsed so that the device under test
receives a duration of voltage.
For the Human Body Model, the current limiting
resistor (R
S
) and the source capacitor (C
S
) are
1.5k
an 100pF, respectively. For IEC-1000-4-
2, the current limiting resistor (R
S
) and the source
capacitor (C
S
) are 330
an 150pF, respectively.
The higher C
S
value and lower R
S
value in the
IEC1000-4-2 model are more stringent than the
Human Body Model. The larger storage capacitor
injects a higher voltage to the test point when
SW2 is switched on. The lower current limiting
resistor increases the current charge onto the test
point.
SP490E/SP491E HUMAN BODY
IEC1000-4-2
Family
MODEL Air Discharge Direct Contact Level
Driver Outputs
15kV
15kV
8kV
4
Receiver Inputs
15kV
15kV
8kV
4
Table 1. Transceiver ESD Tolerance Levels
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
Copyright 2000 Sipex Corporation
10
D
ALTERNATE
END PINS
(BOTH ENDS)
D1 = 0.005" min.
(0.127 min.)
E
PACKAGE: PLASTIC
DUALINLINE
(NARROW)
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
A = 0.210" max.
(5.334 max).
E1
C
L
A2
A1 = 0.015" min.
(0.381min.)
B
B1
e = 0.100 BSC
(2.540 BSC)
e
A
= 0.300 BSC
(7.620 BSC)
A2
B
B1
C
D
E
E1
L
0.115/0.195
(2.921/4.953)
0.014/0.022
(0.356/0.559)
0.045/0.070
(1.143/1.778)
0.008/0.014
(0.203/0.356)
0.735/0.775
(18.669/19.685)
0.300/0.325
(7.620/8.255)
0.240/0.280
(6.096/7.112)
0.115/0.150
(2.921/3.810)
0/ 15
(0/15)
0.115/0.195
(2.921/4.953)
0.014/0.022
(0.356/0.559)
0.045/0.070
(1.143/1.778)
0.008/0.014
(0.203/0.356)
0.355/0.400
(9.017/10.160)
0.300/0.325
(7.620/8.255)
0.240/0.280
(6.096/7.112)
0.115/0.150
(2.921/3.810)
0/ 15
(0/15)
22PIN
8PIN
14PIN
16PIN
0.115/0.195
(2.921/4.953)
0.014/0.022
(0.356/0.559)
0.045/0.070
(1.143/1.778)
0.008/0.014
(0.203/0.356)
1.145/1.155
(29.083/29.337)
0.300/0.325
(7.620/8.255)
0.240/0.280
(6.096/7.112)
0.115/0.150
(2.921/3.810)
0/ 15
(0/15)
0.115/0.195
(2.921/4.953)
0.014/0.022
(0.356/0.559)
0.045/0.070
(1.143/1.778)
0.008/0.014
(0.203/0.356)
0.780/0.800
(19.812/20.320)
0.300/0.325
(7.620/8.255)
0.240/0.280
(6.096/7.112)
0.115/0.150
(2.921/3.810)
0/ 15
(0/15)
18PIN
0.115/0.195
(2.921/4.953)
0.014/0.022
(0.356/0.559)
0.045/0.070
(1.143/1.778)
0.008/0.014
(0.203/0.356)
0.880/0.920
(22.352/23.368)
0.300/0.325
(7.620/8.255)
0.240/0.280
(6.096/7.112)
0.115/0.150
(2.921/3.810)
0/ 15
(0/15)
20PIN
0.115/0.195
(2.921/4.953)
0.014/0.022
(0.356/0.559)
0.045/0.070
(1.143/1.778)
0.008/0.014
(0.203/0.356)
0.980/1.060
(24.892/26.924)
0.300/0.325
(7.620/8.255)
0.240/0.280
(6.096/7.112)
0.115/0.150
(2.921/3.810)
0/ 15
(0/15)
11
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
Copyright 2000 Sipex Corporation
D
E
H
PACKAGE: PLASTIC
SMALL OUTLINE (SOIC)
(NARROW)
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
8PIN
A
A1
L
B
e
h x 45
A
A1
B
D
E
e
H
h
L
0.053/0.069
(1.346/1.748)
0.004/0.010
(0.102/0.249
0.014/0.019
(0.35/0.49)
0.189/0.197
(4.80/5.00)
0.150/0.157
(3.802/3.988)
0.050 BSC
(1.270 BSC)
0.228/0.244
(5.801/6.198)
0.010/0.020
(0.254/0.498)
0.016/0.050
(0.406/1.270)
0/8
(0/8)
14PIN
0.053/0.069
(1.346/1.748)
0.004/0.010
(0.102/0.249)
0.013/0.020
(0.330/0.508)
0.337/0.344
(8.552/8.748)
0.150/0.157
(3.802/3.988)
0.050 BSC
(1.270 BSC)
0.228/0.244
(5.801/6.198)
0.010/0.020
(0.254/0.498)
0.016/0.050
(0.406/1.270)
0/8
(0/8)
16PIN
0.053/0.069
(1.346/1.748)
0.004/0.010
(0.102/0.249)
0.013/0.020
(0.330/0.508)
0.386/0.394
(9.802/10.000)
0.150/0.157
(3.802/3.988)
0.050 BSC
(1.270 BSC)
0.228/0.244
(5.801/6.198)
0.010/0.020
(0.254/0.498)
0.016/0.050
(0.406/1.270)
0/8
(0/8)
SP490EDS/14
SP490E Enhanced Full Duplex RS-485 Transceivers
Copyright 2000 Sipex Corporation
12
ORDERING INFORMATION
Model
Temperature Range
Package
SP490ECN. ...................................................... 0C to +70C ..................................................... 8-Pin NSOIC
SP490ECP ........................................................ 0C to +70C ........................................................... 8-Pin DIP
SP490EEN. ..................................................... -40C to +85C ................................................... 8-Pin NSOIC
SP490EEP ...................................................... -40C to +85C ......................................................... 8-Pin DIP
SP491ECN ....................................................... 0C to +70C ................................................... 14-Pin NSOIC
SP491ECP ........................................................ 0C to +70C ......................................................... 14-Pin DIP
SP491EEN. ..................................................... -40C to +85C ................................................. 14-Pin NSOIC
SP491EEP ...................................................... -40C to +85C ....................................................... 14-Pin DIP
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.
Please consult the factory for pricing and availability on a Tape-On-Reel option.
Sipex Corporation
Headquarters and
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
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