1
10/16/02 SP3488/3489 Low Power Quad RS-485/422 Line Receivers
Copyright 2002 Sipex Corporation
RS-485 or RS-422 Quad Differential
Line Receivers
Operates from a single +3.3V supply
Interoperable with +5.0V logic
Tri-state Output Control
-7V to +12V Common-Mode Input
Voltage Range
Common Driver Enable Control
(SP3488)
Independent Driver Enable Controls
for each pair of Drivers (SP3489)
Compatibility with LTC488
and SN75173 (SP3488)
Compatibility with LTC489
and SN75175 (SP3489)
DESCRIPTION...
The SP3488 and the SP3489 are +3.3V low power quad line receivers that meet the
specifications of the RS-485 and RS-422 serial protocols. These devices are pin-to-pin
compatible with Sipex's SP488 and SP489 devices as well as popular industry standards.
The SP3488 and SP3489 feature Sipex's BiCMOS process allowing low power operation
without sacrificing performance. The SP3488 and SP3489 meet the electrical specifications
of RS-485 and RS-422 serial protocols up to 10Mbps under load. The SP3488 features a
common receiver enable control. The SP3489 provides independent receiver enable
controls for each pair of receivers. Both devices feature tri-state outputs and a -7V to +12V
common-mode input range. The receivers have a fail-safe feature which forces a logic "1"
output when receiver inputs are left floating.
SP3488 and SP3489
SP3488
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
SP3489
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
+3.3V Low Power Quad
RS-485/RS-422 Line Receivers
10/16/02 SP3488/3489 Low Power Quad RS-485/422 Line Receivers
Copyright 2002 Sipex Corporation
2
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
......................................................................................... +6.0V
Input Voltages
Logic ...................................................................... 0.3V to +6.0V
Receiver ...............................................................................
14V
Receiver Output Voltage .......................................... 0.3V to +6.0V
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
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
k
-7V
V
CM
12V
Differential Input Threshold
-0.2
+0.2
Volts
-7V
V
CM
12V
Input Current (A, B)
V
CC
= 0V or 3.3V; I
IN2
+1.0
mA
V
IN
= +12V
-0.8
mA
V
IN
= 7V
Maximum Data Rate
10
Mbps
RECEIVER OUTPUTS
Output Voltage
V
OH
V
CC
-0.4
V
I
O
= -1.5mA; V
ID
= +0.2V
V
OL
0.4
V
I
O
= +2.5mA; V
ID
= -0.2V
High Impedance Output Current
1
A
V
CC
= maximum; 0.4V
V
O
V
CC
POWER REQUIREMENTS
Supply Current
2.2
5
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
SPECIFICATIONS
V
CC
= +3.3V
5%; typicals at 25
C; T
MIN
T
A
T
MAX
unless otherwise noted.
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10/16/02 SP3488/3489 Low Power Quad RS-485/422 Line Receivers
Copyright 2002 Sipex Corporation
A
B
54
15pF
DI
1/4 SP3486
1/4 SP3488
15pF EN
EN
ROn
DRIVER
RCVR
C
L
Figure 1. Timing Test Circuit
S
1
RCVR
S
2
V
CC
1k
C
L
1k
Figure 2. Enable/Disable Timing Test Circuit
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 -- EN -- Receiver Output Enable. Please
refer to SP3488 Truth Table (1).
SP3488 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 SP3488 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.
SP3488
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
SP3489
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
10/16/02 SP3488/3489 Low Power Quad RS-485/422 Line Receivers
Copyright 2002 Sipex Corporation
4
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 -- V
CC
-- Positive Supply +3.00V < V
CC
< +3.60V
SP3489 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
Receiver 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 SP3489 Truth Table (2).
Pin 5 -- RO
2
-- Receiver 2 Output -- If
Receiver 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.
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. SP3488 Truth Table
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 SP3489 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 -- V
CC
-- Positive Supply +3.00V < V
CC
< +3.60V
Table 2. SP3489 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 SP3488 and the SP3489 are +3.3V low
power quad line receivers that meet the
specifications of the RS-485 and RS-422 serial
protocols. These devices are pin-to-pin
compatible with Sipex's SP488 and SP489
devices as well as popular industry standards.
The SP3488 and SP3489 devices feature
Sipex's BiCMOS process allowing low power
operation without sacrificing performance.
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
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10/16/02 SP3488/3489 Low Power Quad RS-485/422 Line Receivers
Copyright 2002 Sipex Corporation
PARAMETER
MIN.
TYP.
MAX.
UNIT
CONDITIONS
PROPAGATION DELAY
Receiver Input to Output
C
L
= 15pF;
Figure 1, 3
Low to HIGH (tPLH)
75
115
ns
High to LOW (tPH
L
)
80
115
ns
Differential Receiver Skew (t
SKD
)
4
ns
Receiver Rise Time (t
R
)
10% to 90%
SP3488
7
15
ns
SP3489
7
15
ns
Receiver Fall Time (t
F
)
90% to 10%
SP3488
6
15
ns
SP3489
6
15
ns
RECEIVER ENABLE
To Output HIGH
46
100
ns
C
L
= 15pF;
Figures 2 and 4
(S2 closed)
To Output LOW
46
100
ns
CL = 15pF;
Figures 2 and 4
(S1 closed)
RECEIVER DISABLE
From Output LOW
46
100
ns
CL = 15pF;
Figures 2 and 4
(S1 closed)
From Output HIGH
46
100
ns
CL = 15pF;
Figures 2 and 4
(S2 closed)
cabling can be as long as 4,000 feet, RS-485
transceivers are equipped with a wide (-7V to
+12V) common mode range to accomodate
ground potential differences. Because the
RS-485 protocol is a differential interface, data
is virtually immune to noise in the transmission
line.
Receiver...
The SP3488 and the SP3489 receivers have
differential inputs with an input sensitivity
as low as +100mV. 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 SP3488 features active HIGH and active
LOW common receiver enable controls. Refer
to SP3488 Truth Table in Table 1. The SP3489
provides independent, active high receiver
enable controls for each pair of receivers. Refer
to SP3489 Truth Table in Table 2. Both devices
feature tri-state outputs and a -7V to +12V
common-mode input range permitting a +7V
ground difference between devices on the
communication bus. The SP3488 and the SP3489
are equipped with a fail-safe feature which forces
a logic HIGH at the receiver output when the
input is left floating. The SP3488 and SP3489
receivers meet the electrical specifications of
RS-485 and RS-422 serial protocol data rates up
to 10Mbps under load.
AC PARAMETERS
V
CC
= +3.3V
5%; typicals at 25
C; T
AMB
= 25
C unless otherwise noted.
10/16/02 SP3488/3489 Low Power Quad RS-485/422 Line Receivers
Copyright 2002 Sipex Corporation
6
Figure 4. 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 3. 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
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10/16/02 SP3488/3489 Low Power Quad RS-485/422 Line Receivers
Copyright 2002 Sipex Corporation
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
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)
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)
10/16/02 SP3488/3489 Low Power Quad RS-485/422 Line Receivers
Copyright 2002 Sipex Corporation
8
D
E
H
PACKAGE: PLASTIC
SMALL OUTLINE (SOIC)
(WIDE)
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
A
A1
L
B
e
A
A1
B
D
E
e
H
L
16PIN
0.093/0.104
(2.352/2.649)
0.004/0.012
(0.102/0.300)
0.013/0.020
(0.330/0.508)
0.398/0.413
(10.10/10.49)
0.291/0.299
(7.402/7.600)
0.050 BSC
(1.270 BSC)
0.394/0.419
(10.00/10.64)
0.016/0.050
(0.406/1.270)
0/8
(0/8)
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10/16/02 SP3488/3489 Low Power Quad RS-485/422 Line Receivers
Copyright 2002 Sipex Corporation
ORDERING INFORMATION
Quad RS485 Receivers:
Model .................................... Enable/Disable ........................................................... Temperature Range ................................................ Package
SP3488CP ........................... Common; active Low and Active High ...................... 0
C to +70
C ........................................... 16pin Plastic DIP
SP3488CT ............................ Common; active Low and Active High ...................... 0
C to +70
C .................................................... 16pin SOIC
SP3488EP ............................ Common; active Low and Active High ...................... 40
C to +85
C ....................................... 16pin Plastic DIP
SP3488ET ............................ Common; active Low and Active High ...................... 40
C to +85
C ................................................ 16pin SOIC
SP3489CP ........................... One per driver pair; active High ................................. 0
C to +70
C ........................................... 16pin Plastic DIP
SP3489CT ............................ One per driver pair; active High ................................. 0
C to +70
C .................................................... 16pin SOIC
SP3489EP ............................ One per driver pair; active High ................................. 40
C to +85
C ....................................... 16pin Plastic DIP
SP3489ET ............................ One per driver pair; active High ................................. 40
C to +85
C ................................................ 16pin SOIC
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.
Corporation
SIGNAL PROCESSING EXCELLENCE
Please consult the factory for pricing and availability on a Tape-On-Reel option.
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Sales Office
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com
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