1
SP488E/489EDS/07 SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers Copyright 2000 Sipex Corporation
s
RS-485 or RS-422 Applications
s
Quad Differential Line Receivers
s
Receiver Output Disable
s
7V to +12V Common Mode Input Range
s
1mA Supply Current
s
Single +5V Supply Operation
s
Superior Drop-in Replacement for
SN75173, SN75175, LTC488 and LTC489
s
Improved ESD Specifications:
+15kV Human Body Model
+15kV IEC1000-4-2 Air Discharge
+8kV IEC1000-4-2 Contact Discharge
DESCRIPTION...
The SP488E and SP489E are low-power quad differential line receivers that meet 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 IEC1000-4-2 Air Discharge Method. These devices are superior drop-in replace-
ments to Sipex's SP488 and SP489 devices as well as popular industry standards. As with
the original versions, the SP488E features a common receiver enable control and the
SP489E provides independent receiver enable controls for each pair of receivers. Both
feature wide common-mode input ranges. The receivers have a fail-safe features which
forces a logic "1" output when receiver inputs are left floating. Both are available in 16-pin
plastic DIP and SOIC packages.
SP488E and SP489E
Enhanced Quad RS-485/RS-422 Line Receivers
SP488E
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
SP489E
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
2
SP488E/489EDS/07 SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers Copyright 2000 Sipex Corporation
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
10
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
0.4V
V
O
2.4V,
EN = O, EN = 1,
EN
1
/ EN
2
= EN
3
/ EN
4
= O
POWER REQUIREMENTS
Supply Voltage
4.75
5.00
5.25
Volts
Supply Current
1
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
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SP488E/489EDS/07 SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers Copyright 2000 Sipex Corporation
A
B
54
100pF
DI
1/4 SP486E
1/4 SP488E
100pF 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 SP488E Truth Table (1).
SP488 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
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 SP488E Truth Table (1).
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.
SP488E
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
SP489E
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
4
SP488E/489EDS/07 SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers Copyright 2000 Sipex Corporation
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.
SP489E 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 SP489E 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. SP488E 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 SP489E 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.
Table 2. SP489E 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 SP488E and SP489E are lowpower quad
differential line receivers meeting RS-485 and
RS-422 standards. The SP488E features active
high and active low common receiver enable
controls; the SP489E 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
SP488E/489E are equipped with a failsafe
feature which forces a logic high at the receiver
output when the input is left floating. Data rates
up to 10Mbps are supported. Both are available
in 16-pin plastic DIP and SOIC packages.
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SP488E/489EDS/07 SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers Copyright 2000 Sipex Corporation
PARAMETER
MIN.
TYP.
MAX.
UNIT
CONDITIONS
PROPAGATION DELAY
Receiver Input to Output
C
L
= 15pF;
Figure 1, 3
Low to HIGH (t
PLH
)
45
60
ns
High to LOW (t
PHL
)
45
60
ns
Differential Receiver Skew (t
SKD
)
5
ns
t
SKD
= t
PHL
- t
PLH
RECEIVER ENABLE
To Output HIGH
30
60
ns
C
L
= 15pF;
Figures 2 and 4
(S2 closed)
To Output LOW
35
60
ns
CL = 15pF;
Figures 2 and 4
(S1 closed)
RECEIVER DISABLE
From Output LOW
35
60
ns
CL = 15pF;
Figures 2 and 4
(S1 closed)
From Output HIGH
30
60
ns
CL = 15pF;
Figures 2 and 4
(S2 closed)
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
AC PARAMETERS
V
CC
= 5V
5%; typicals at 25
C; T
AMB
= 25
C unless otherwise noted.
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