®
SP488E and SP489E
Enhanced Quad RS-485/RS-422 Line Receivers
s
s
s
s
s
s
s
RS-485 or RS-422 Applications
Quad Differential Line Receivers
Receiver Output Disable
–7V to +12V Common Mode Input Range
1mA Supply Current
Single +5V Supply Operation
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.
RI
1
B
RI
1
A
RO
1
EN
RO
2
RI
2
A
RI
2
B
GND
1
2
3
4
5
6
7
8
SP488E
1
4
16
15
14
13
12
V
CC
RI
4
B
RI
4
A
RO
4
EN
RO
3
RI
3
A
RI
3
B
RI
1
B
RI
1
A
RO
1
EN
1
/EN
2
RO
2
RI
2
A
RI
2
B
GND
1
2
3
4
5
6
7
8
SP489E
1
4
16
15
14
13
12
V
CC
RI
4
B
RI
4
A
RO
4
EN
3
/EN
4
RO
3
RI
3
A
RI
3
B
2
3
11
10
9
2
3
11
10
9
SP488E/489EDS/07
SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers
© Copyright 2000 Sipex Corporation
1
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
DC CHARACTERISTICS
Digital Inputs
Voltage
V
IL
V
IH
Input Current
RECEIVER INPUTS
Input Resistance
Differential Input Threshold
Input Current (A, B)
MIN.
TYP.
MAX.
UNIT
CONDITIONS
EN, EN, EN
1
/EN
2
, EN
3
/EN
4
0.8
2.0
+2
Volts
Volts
µA
0V
≤
V
IN
≤
V
CC
12
–0.2
+0.2
+1.0
–0.8
kOhm
Volts
mA
mA
Mbps
Maximum Data Rate
10
RECEIVER OUTPUTS
Output Voltage
V
OH
3.5
V
OL
High Impedance Output Current
–7V
≤
V
CM
≤
12V
–7V
≤
V
CM
≤
12V
V
CC
= 0V or 5.25V; I
IN2
V
IN
= +12V
V
IN
= –7V
0.4
+1
V
V
µA
0.4V
≤
V
O
≤
2.4V,
EN = O, EN = 1,
EN
1
/ EN
2
= EN
3
/ EN
4
= O
I
O
= –4mA; V
ID
= +0.2V
I
O
= +4mA; V
ID
= –0.2V
POWER REQUIREMENTS
Supply Voltage
4.75
5.00
5.25
Supply Current
1
5
ENVIRONMENTAL AND MECHANICAL
Operating Temperature
–C
0
+70
–E
–40
+85
Storage Temperature
–65
+150
Package
–_P
16–pin Plastic DIP
–_T
16–pin SOIC
Volts
mA
No load
°C
°C
°C
SP488E/489EDS/07
SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers
© Copyright 2000 Sipex Corporation
2
100pF EN
A
S
1
RCVR
ROn
C
L
1kΩ
V
CC
DI
DRIVER
B
54Ω
RCVR
C
L
1kΩ
S
2
100pF
EN
1/4 SP488E
1/4 SP486E
Figure 1. Timing Test Circuit
Figure 2. Enable/Disable Timing Test Circuit
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.
PINOUT
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).
RI
1
B
RI
1
A
RO
1
EN
RO
2
RI
2
A
RI
2
B
GND
1
2
3
4
5
6
7
8
SP488E
1
4
16
15
14
13
12
V
CC
RI
4
B
RI
4
A
RO
4
EN
RO
3
RI
3
A
RI
3
B
RI
1
B
RI
1
A
RO
1
EN
1
/EN
2
RO
2
RI
2
A
RI
2
B
GND
1
2
3
4
5
6
7
8
SP489E
1
4
16
15
14
13
12
V
CC
RI
4
B
RI
4
A
RO
4
EN
3
/EN
4
RO
3
RI
3
A
RI
3
B
2
3
11
10
9
2
3
11
10
9
SP488E/489EDS/07
SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers
© Copyright 2000 Sipex Corporation
3
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.
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.
FEATURES…
The
SP488E
and
SP489E
are low–power 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 tri–state outputs
and a -7V to +12V common–mode input range
permitting a +7V ground difference between
devices on the communications bus. The
SP488E/489E
are equipped with a fail–safe
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.
DIFFERENTIAL
A–B
V
ID
≥
0.2V
–0.2V < V
ID
< +0.2V
V
ID
≤
0.2V
X
ENABLES
EN
1
/EN
2
or EN
3
/EN
4
H
H
H
L
OUTPUT
RO
H
X
L
Hi–Z
DIFFERENTIAL
A–B
V
ID
≥
0.2V
–0.2V < V
ID
< +0.2V
V
ID
≤
0.2V
X
ENABLES
EN
EN
H
X
H
X
H
X
L
X
L
X
L
X
L
H
OUTPUT
RO
H
H
X
X
L
L
Hi–Z
Table 1. SP488E Truth Table
Table 2. SP489E Truth Table
SP488E/489EDS/07
SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers
© Copyright 2000 Sipex Corporation
4
AC PARAMETERS
V
CC
= 5V±5%; typicals at 25°C; T
AMB
= 25°C unless otherwise noted.
PARAMETER
MIN.
PROPAGATION DELAY
Receiver Input to Output
Low to HIGH (t
PLH
)
High to LOW (t
PHL
)
Differential Receiver Skew (t
SKD
)
RECEIVER ENABLE
To Output HIGH
To Output LOW
RECEIVER DISABLE
From Output LOW
From Output HIGH
TYP.
MAX.
UNIT
CONDITIONS
C
L
= 15pF;
Figure 1, 3
t
SKD
= t
PHL
- t
PLH
45
45
5
60
60
ns
ns
ns
30
35
60
60
ns
ns
C
L
= 15pF;
Figures 2 and 4
(S2 closed)
CL = 15pF;
Figures 2 and 4
(S1 closed)
CL = 15pF;
Figures 2 and 4
(S1 closed)
CL = 15pF;
Figures 2 and 4
(S2 closed)
35
30
60
60
ns
ns
Input A–B
+V
OD
–V
OD
t
PHL
F = 1MHZ: t
r
< 10ns: t
f
< 10ns
0V
t
PLH
0V
RO
V
OH
V
OL
1.5V
1.5V
Figure 3. Receiver Propagation Delays
3V
EN
0V
t
ZL
RO
5V
V
OL
t
ZH
RO
V
OH
0V
F = 1MHZ: t
r
< 10ns: t
f
< 10ns
1.5V
t
LZ
1.5V
1.5V
Output normally low
t
HZ
Output normally high
1.5V
0.5V
0.5V
Figure 4. Receiver Enable/Disable Timing
SP488E/489EDS/07
SP488E/489E Enhanced Quad RS-485/RS-422 Line Receivers
© Copyright 2000 Sipex Corporation
5
