SP488A/489ADS/07 SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers
Copyright 2000 Sipex Corporation
1
PRELIMINARY INFORMATION
s
High Speed Versions of Sipex's
SP488 & SP489
s
30Mbps Transmission Rates
s
Quad Differential Line Receivers
s
RS-485 or RS-422 Applications
s
Tristate Output Control
s
30ns Typical Receiver Propagation
Delays
s
7V to +12V Common Mode Input
Range
s
1mA Supply Current
s
Single +5V Supply Operation
s
Pin Compatible with SN75173,
SN75175, LTC488 and LTC489
DESCRIPTION...
The SP488A and SP489A are high speed quad differential line receivers capable of
meeting the RS-485 and RS-422 protocols while running at five times the normal
transmission rates. The SP488A and SP489A are enhanced versions of Sipex's SP488
and SP489 quad RS-485/RS-422 line receivers. The SP488A features a common
receiver enable control; the SP489A provides independent receiver enable controls for each
pair of receivers. Both feature tristate outputs and wide commonmode input range.
The receivers have a failsafe feature which forces a logic "1" output when receiver inputs
are left floating. Both are available in 16pin plastic DIP and SOIC packages.
SP488A and SP489A
SP488A
RI
1
B
RI
1
A
RO
1
EN
RO
2
RI
2
A
RI
2
B
GND
V
CC
RI
4
B
RI
4
A
RO
4
EN
RO
3
RI
3
A
RI
3
B
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
4
3
2
SP489A
RI
1
B
RI
1
A
RO
1
EN
1
/EN
2
RO
2
RI
2
A
RI
2
B
GND
V
CC
RI
4
B
RI
4
A
RO
4
EN
3
/EN
4
RO
3
RI
3
A
RI
3
B
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
4
3
2
High Speed Quad
RS-485/RS-422 Line Receivers
SP488A/489ADS/07 SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers
Copyright 2000 Sipex Corporation
2
PRELIMINARY INFORMATION
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of the device
at these 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)
Receiver ...............................................................................
14V
Receiver Output Voltage ................................. 0.5V to (V
CC
+0.5V)
Input Currents
Logic ..................................................................................
25mA
Storage Temperature ............................................ 65
C to +150
C
Power Dissipation
Plastic DIP ........................................................................ 375mW
(derate 7mW/
C above +70
C)
Small Outline .................................................................... 375mW
(derate 7mW/
C above +70
C)
Lead Temperature (soldering, 10 sec) ................................... 300
C
SPECIFICATIONS
V
CC
= 5V
5%; typicals at 25
C; T
MIN
T
A
T
MAX
unless otherwise noted.
PARAMETER
MIN.
TYP.
MAX.
UNIT
CONDITIONS
DC CHARACTERISTICS
Digital Inputs
EN, EN, EN
1
/EN
2
, EN
3
/EN
4
Voltage
V
IL
0.8
Volts
V
IH
2.0
Volts
Input Current
2
A
0V
V
IN
V
CC
RECEIVER INPUTS
Input Resistance
12
kOhm
7V
V
CM
12V
Differential Input Threshold
-0.2
+0.2
Volts
7V
V
CM
12V
Input Current (A, B)
V
CC
= 0V or 5.25V; I
IN2
+1.0
mA
V
IN
= +12V
-0.8
mA
V
IN
= 7V
Maximum Data Rate
30
Mbps
RECEIVER OUTPUTS
Output Voltage
V
OH
3.5
V
I
O
= 4mA; V
ID
= +0.2V
V
OL
0.4
V
I
O
= +4mA; V
ID
= 0.2V
High Impedance Output Current
+1
A
EN = O, EN = V
CC
, EN
1
/EN
2
= O,
EN
3
/EN
4
= O, 0.4V
V
O
2.4V
POWER REQUIREMENTS
Supply Voltage
4.75
5.25
Volts
Supply Current
TBD
mA
No load
ENVIRONMENTAL AND MECHANICAL
Operating Temperature
C
0
+70
C
E
-40
+85
C
Storage Temperature
-65
+150
C
Package
_P
16pin Plastic DIP
_T
16pin SOIC
SP488A/489ADS/07 SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers
Copyright 2000 Sipex Corporation
3
PRELIMINARY INFORMATION
AC PARAMETERS
V
CC
= 5V
5%; typicals at 25
C; 0
C
T
A
+70
C unless otherwise noted.
PARAMETER
MIN.
TYP.
MAX.
UNIT
CONDITIONS
PROPAGATION DELAY
Receiver Input to Output
C
L
= 15pF;
Figure 1, 3
Low to HIGH (t
PLH
)
TBD
ns
High to LOW (t
PHL
)
TBD
ns
Differential Receiver Skew (t
SKD
)
TBD
ns
Receiver Rise Time (t
R
)
10% to 90%
SP488A
TBD
ns
SP489A
TBD
ns
Receiver Fall Time (t
F
)
90% to 10%
SP488A
TBD
ns
SP489A
TBD
ns
RECEIVER ENABLE
To Output HIGH
TBD
ns
C
L
= 15pF;
Figures 2 and 4
(S2 closed)
To Output LOW
TBD
ns
CL = 15pF;
Figures 2 and 4
(S1 closed)
RECEIVER DISABLE
From Output LOW
TBD
ns
CL = 15pF;
Figures 2 and 4
(S1 closed)
From Output HIGH
TBD
ns
CL = 15pF;
Figures 2 and 4
(S2 closed)
Figure 2. Receiver Enable/Disable Timing
3V
0V
5V
V
OH
0V
Output normally low
F = 1MHZ: t
r
< 10ns: t
f
< 10ns
t
ZL
t
LZ
EN
V
OL
1.5V
1.5V
1.5V
0.5V
1.5V
0.5V
Output normally high
RO
t
ZH
RO
t
HZ
Figure 1. Receiver Propagation Delays
F = 1MHZ: t
r
< 10ns: t
f
< 10ns
t
PHL
t
PLH
V
OL
0V
0V
1.5V
RO
V
OH
1.5V
V
OD
+V
OD
Input AB
SP488A/489ADS/07 SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers
Copyright 2000 Sipex Corporation
4
PRELIMINARY INFORMATION
Pin 9 -- RI
3
B -- Receiver 3 input B.
Pin 10 -- RI
3
A
--
Receiver 3 input A.
Pin 11 -- RO
3
-- Receiver 3 Output -- If
Receiver 3 output is enabled, if RI
3
A > RI
3
B by
200mV, Receiver 3 output is high. If Receiver 3
output is enabled, and if RI
3
A < RI
3
B by
200mV, Receiver 3 output is low.
Pin 12 -- EN -- Receiver Output Enable. Please
refer to SP488A Truth Table (1).
Pin 13 -- RO
4
-- Receiver 4 Output -- If
Receiver 4 output is enabled, if RI
4
A > RI
4
B by
200mV, Receiver 4 output is high. If Receiver 4
output is enabled, and if RI
4
A < RI
4
B by
200mV, Receiver 4 output is low.
Pin 14 -- RI
4
A
-- Receiver 4 input A.
Pin 15 -- RI
4
B -- Receiver 4 input B.
Pin 16 -- Supply Voltage V
CC
-- 4.75V
V
CC
5.25V.
SP488A PINOUT
Pin 1 -- RI
1
B -- Receiver 1 input B.
Pin 2 -- RI
1
A
--
Receiver 1 input A.
Pin 3 -- RO
1
-- Receiver 1 Output -- If Re-
ceiver 1 output is enabled, if RI
1
A
> RI
1
B by
200mV, Receiver output is high. If Receiver 1
output is enabled, and if RI
1
A
< RI
1
B
by 200mV,
Receiver 1 output is low.
Pin 4 -- EN -- Receiver Output Enable. Please
refer to SP488A Truth Table (1).
Pin 5 -- RO
2
-- Receiver 2 Output -- If Re-
ceiver 2 output is enabled, if RI
2
A > RI
2
B by
200mV, Receiver 2 output is high. If Receiver 2
output is enabled, and if RI
2
A < RI
2
B by
200mV, Receiver 2 output is low.
Pin 6 -- RI
2
A -- Receiver 2 input A.
Pin 7 -- RI
2
B -- Receiver 2 input B.
Pin 8 -- GND -- Digital Ground.
SP488A
RI
1
B
RI
1
A
RO
1
EN
RO
2
RI
2
A
RI
2
B
GND
V
CC
RI
4
B
RI
4
A
RO
4
EN
RO
3
RI
3
A
RI
3
B
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
4
3
2
SP489A
RI
1
B
RI
1
A
RO
1
EN
1
/EN
2
RO
2
RI
2
A
RI
2
B
GND
V
CC
RI
4
B
RI
4
A
RO
4
EN
3
/EN
4
RO
3
RI
3
A
RI
3
B
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
4
3
2
PINOUT
SP488A/489ADS/07 SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers
Copyright 2000 Sipex Corporation
5
PRELIMINARY INFORMATION
SP489A PINOUT
Pin 1 -- RI
1
B -- Receiver 1 input B.
Pin 2 -- RI
1
A --
Receiver 1 input A.
Pin 3 -- RO
1
--
Receiver 1 Output -- If Re-
ceiver 1 output is enabled, if RI
1A
> RI
1
B by
200mV, Receiver output is high. If Receiver 1
output is enabled, and if RI
1
A
< RI
1
B
by 200mV,
Receiver 1 output is low.
Pin 4 -- EN1/EN2 -- Receiver 1 and 2 Output
Enable. Please refer to SP489A Truth Table (2).
Pin 5 -- RO
2
-- Receiver 2 Output -- If Re-
ceiver 2 output is enabled, if RI
2
A > RI
2
B by
200mV, Receiver 2 output is high. If Receiver 2
output is enabled, and if RI
2
A < RI
2
B by
200mV, Receiver 2 output is low.
Pin 6 -- RI
2
A -- Receiver 2 input A.
Pin 7 -- RI
2
B -- Receiver 2 input B.
Pin 8 -- GND -- Digital Ground.
Pin 9 -- RI
3
B -- Receiver 3 input B.
Pin 10 -- RI
3
A --
Receiver 3 input A.
Pin 11 -- RO
3
-- Receiver 3 Output -- If
Receiver 3 output is enabled, if RI
3
A > RI
3
B by
200mV, Receiver 3 output is high. If Receiver 3
output is enabled, and if RI
3
A < RI
3
B by
200mV, Receiver 3 output is low.
Pin 12 -- EN3/EN4 -- Receiver 3 and 4 Output
Enable. Please refer to SP489A Truth Table (2).
Pin 13 -- RO
4
-- Receiver 4 Output -- If
Receiver 4 output is enabled, if RI
4
A > RI
4
B by
200mV, Receiver 4 output is high. If Receiver 4
output is enabled, and if RI
4
A < RI
4
B by
200mV, Receiver 4 output is low.
Pin 14 -- RI
4
A
-- Receiver 4 input A.
Pin 15 -- RI
4
B -- Receiver 4 input B.
Pin 16 -- Supply Voltage V
CC
-- 4.75V
V
CC
5.25V.
A
B
54
50pF
DI
1/4 SP486
1/4 SP488
50pF EN
EN
ROn
DRIVER
RCVR
C
L
Figure 3. Timing Test Circuit
S
1
RCVR
S
2
V
CC
1k
C
L
1k
Figure 4. Enable/Disable Timing Test Circuit
SP488A/489ADS/07 SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers
Copyright 2000 Sipex Corporation
6
PRELIMINARY INFORMATION
Table 2. SP489A Truth Table
DIFFERENTIAL
ENABLES
OUTPUT
A B
EN
1
/EN
2
or EN
3
/EN
4
RO
V
ID
0.2V
H
H
0.2V < V
ID
< +0.2V
H
X
V
ID
0.2V
H
L
X
L
HiZ
FEATURES...
The SP488A and SP489A are lowpower quad
differential line receivers meeting RS-485 and
RS-422 serial protocol. The SP488A and
SP489A feature Sipex's BiCMOS process
allowing low power operational characteristics
of CMOS technology while meeting all of the
demands of the RS-485 and RS-422 serial
protocols over 10Mbps under load in harsh
environments. In fact, the SP488A and SP489A
can transmit signals up to 30Mbps.
The RS-485 standard is ideal for multi-drop
applications and for long-distance communica-
tion. 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.
DIFFERENTIAL
ENABLES
OUTPUT
A B
EN
EN
RO
V
ID
0.2V
H
X
H
X
L
H
0.2V < V
ID
< +0.2V
H
X
X
X
L
X
V
ID
0.2V
H
X
L
X
L
L
X
L
H
HiZ
Table 1. SP488A Truth Table
Normally an RS-485 driver will produce no less
than 1.5V before cable attenuation. After cable
loss, the signal may degrade and have an
amplitude of less than 1.0V. The receiver input
sensitivity of the SP488A and SP489A allows
the devices to receive signals as low as 200mV.
The SP488A features active high and active
low common receiver enable controls; the
SP489A provides independent, active high
receiver enable controls for each pair of
receivers. Both feature tristate outputs and
a -7V to +12V commonmode input range
permitting a
7V ground difference between
devices on the communications bus. The
SP488A/489A are equipped with a failsafe
feature which forces a logic high at the
receiver output when the input is left floating.
Both are available in 16-pin plastic DIP and
SOIC packages.
SP488A/489ADS/07 SP488A/489A High Speed Quad RS-485/RS-422 Line Receivers
Copyright 2000 Sipex Corporation
7
PRELIMINARY INFORMATION
ORDERING INFORMATION
Quad RS485 Receivers:
Model ........................ Enable/Disable ...................................... Temperature Range ........................ Package
SP488ACP ............... Common; active Low and Active High .. 0
C to +70
C .................... 16pin Plastic DIP
SP488ACT ................ Common; active Low and Active High .. 0
C to +70
C ............................. 16pin SOIC
SP488AEP ................ Common; active Low and Active High .. 40
C to +85
C ................ 16pin Plastic DIP
SP488AET ................ Common; active Low and Active High .. 40
C to +85
C ......................... 16pin SOIC
SP489ACP ............... One per driver pair; active High ............ 0
C to +70
C .................... 16pin Plastic DIP
SP489ACT ................ One per driver pair; active High ............ 0
C to +70
C ............................. 16pin SOIC
SP489AEP ................ One per driver pair; active High ............ 40
C to +85
C ................ 16pin Plastic DIP
SP489AET ................ One per driver pair; active High ............ 40
C to +85
C ......................... 16pin SOIC
Please consult the factory for pricing and availability on a Tape-On-Reel option.
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.
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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