SP490 / SP491
Full-Duplex RS-485 Transceivers
Description
The SP490 is a low power differential line driver/receiver meeting
RS-485 and RS-422 standards up to 5Mbps. The SP491 is identical
to the SP490 with the addition of driver and receiver tri-state enable
lines. Both products feature ±200mV receiver input sensitivity, over
wide common mode range. The SP490 is available in 8-pin NSOIC
packages for operation over the commercial temperature range. The
SP491 is available in 14-pin NSOIC packages for operation over the
commercial and industrial temperature ranges.
FEATURES
■■
5V only
■■
Low power BiCMOS
■■
Driver/receiver enable (SP491)
■■
RS-485 and RS-422 drivers/receivers
■■
Pin compatible with LTC490 and SN75179
(SP490)
■■
Pin compatible with LTC491 and
SN75180 (SP491)
Ordering Information -
Back Page
Block Diagrams
V
CC
R
1
2
R
8 A
7 B
6
D
Z
NC
R
1
2
R
3
REB
DE 4
5
D
6
GND
7
GND
D
14 V
CC
13 NC
12 A
11 B
10
Z
D
GND
3
4
5 Y
9 Y
8
NC
SP490
SP491
REV 1.0.2
1/13
SP490 / SP491
Absolute Maximum Ratings (SP490)
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
................................................................................7.0V
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.................................-65˚C to +150˚C
Power Dissipation..................................................1000mW
Electrical Characteristics
T
AMB
= T
MIN
to T
MAX
and V
CC
= 5V ±5% unless otherwise noted.
PARAMETERS
SP490 Driver DC Characteristics
Differential output voltage
Differential output voltage
Differential output voltage
Change in magnitude of driver
differential output voltage for
complimentary states
Driver common-mode output voltage
Input high voltage
Input low voltage
Input current
Driver short circuit current
V
OUT
= HIGH
Driver short circuit current
V
OUT
= LOW
SP490 Driver AC Characteristics
Maximum data rate
Driver input to output, t
PLH
Driver input to output, t
PHL
Driver skew
Driver rise or fall time
5
30
30
5
15
40
60
60
Mbps
ns
ns
ns
ns
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF; Figures 3 & 5
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF; Figures 3 & 5
t
SKEW
= | t
DPLH
- t
DPHL
|;
Figures 3 & 5
From 10% to 90%;
R
DIFF
= 54Ω,
C
L1
= C
L2
= 100pF; Figures 3 & 5
2.0
0.8
±10
±250
±250
2
1.5
V
CC
V
CC
V
CC
0.2
3
V
V
V
V
V
V
V
µA
mA
mA
Unloaded; R = ∞Ω ; Figure 1
With load; R = 50Ω (RS-422); Figure 1
With load; R = 27Ω (RS-485); Figure 1
R = 27Ω or R = 50Ω; Figure 1
R = 27Ω or R = 50Ω; Figure 1
Applies to D
Applies to D
Applies to D
-7V ≤ V
O
≤ 12V
-7V ≤ V
O
≤ 12V
MIN.
TYP.
MAX.
UNITS
CONDITIONS
REV 1.0.2
2/13
SP490 / SP491
Electrical Characteristics (Continued)
T
AMB
=T
MIN
to T
MAX
and V
CC
= 5V ±5% unless otherwise noted.
PARAMETERS
SP490 Receiver DC Characteristics
Differential input threshold
Input hysteresis
Output voltage HIGH
Output voltage LOW
Input resistance
Input current (A, B); V
IN
= 12V
Input current (A, B); V
IN
= -7V
Short circuit current
SP490 Receiver AC Characteristics
Maximum data rate
Receiver input to output, t
PLH
Receiver input to output, t
PHL
Differential receiver skew, |t
PLH
- t
PHL
|
Power Requirements
Supply Voltage
Supply Current
SP490 Environmental and Mechanical
Operating Temperture
Commercial (_C_)
Storage Temperature
Package
NSOIC (_N)
0
-65
70
150
°C
°C
4.75
900
5.25
V
µA
5
45
45
13
150
150
Mbps
ns
ns
ns
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF;
Figures 3 and 7
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF;
Figures 3 and 7
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF;
Figures 3 and 7
12
15
±1.0
-0.8
85
3.5
0.4
-0.2
70
0.2
V
mV
V
V
kΩ
mA
mA
mA
-7V ≤ V
CM
≤ 12V
V
CM
= 0V
V
ID
= 200mV, I
O
= -4mA
V
ID
= -200mV, I
O
= 4mA
-7V ≤ V
CM
≤ 12V
V
IN
= 12V
V
IN
= -7V
0V ≤ V
O
≤ V
CC
MIN.
TYP.
MAX.
UNITS
CONDITIONS
REV 1.0.2
3/13
MCU
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