TECHNICAL DATA
ILX485
Low-Power, Slew-Rate-Limited RS-485/RS-422
Transceivers
General Description
The ILX485 is low-power transceivers for RS-485 and RS-
422 communication. IC contains one driver and one receiver.
The driver slew rates of the ILX485 is not limited, allowing
them to transmit up to 2.5Mbps.
These transceivers draw between 120A and 500A of
supply current when unloaded or fully loaded with disabled
drivers. All parts operate from a single 5V supply. Drivers are
short-circuit current limited and are protected against
excessive power dissipation by thermal shutdown circuitry
that places the driver outputs into a high-impedance state.
The receiver input has a fail-safe feature that guarantees a
logic-high output if the input is open circuit. The MAX485 is
designed for half-duplex applications.
Features
Low Quiescent Current: 300A
-7V to +12V Common-Mode Input Voltage Range
Three-State Outputs
30ns Propagation Delays, 5ns Skew
Full-Duplex and Half-Duplex Versions Available
Operate from a Single 5V Supply
Allows up to 32 Transceivers on the Bus
Data rate: 2,5 Mbps
Current-Limiting and Thermal Shutdown for Driver Overload Protection
ORDERING INFORMATION
ILX485N Plastic
ILX485D SOIC
1
ILX485
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
) 12V
Continuous Power Dissipation (T
A
= +70C)
Control Input Voltage -0.5V to (V
CC
+ 0.5V)
8-Pin Plastic DIP (derate 9.09mW/C above
+70C) 727mW
Driver Input Voltage (DI) -0.5V to (V
CC
+ 0.5V)
8-Pin SOP (derate 5.88mW/C above +70C)
471mW
Driver Output Voltage (A, B) -8V to +12.5V
Operating Temperature Ranges 0C to +70C
Receiver Input Voltage (A, B) -8V to +12.5V
Storage Temperature Range -65C to +160C
Receiver Output Voltage (RO) -0.5V to (V
CC
+0.5V)
Lead Temperature (soldering, 10sec) +300C
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 5V 5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1, 2)
PARAMETER SYMBOL
CONDITIONS MIN
TY
P
MAX
UNITS
Differential Driver Output (no
load)
V
OD1
5 V
R = 50 (RS-422)
2
Differential Driver Output
(with load)
V
OD2
R = 27 (RS-485), Figure 4
1.5
5
V
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
V
OD
R = 27 or 50, Figure 4
0.2
V
Driver Common-Mode Output
Voltage
V
OC
R = 27 or 50, Figure 4
3
V
Change in Magnitude of Driver
Common-Mode Output Voltage for
Complementary Output States
V
OD
R = 27 or 50, Figure 4
0.2
V
Input High Voltage
V
IH
DE, DI,
RE
2.0 V
Input Low Voltage
V
IL
DE, DI,
RE
0.8
V
Input Current
I
IN1
DE, DI,
RE
2
A
DE = 0V;
V
IN
= 12V
1.0
Input Current
(A, B)
I
IN2
V
CC
= 0V or 5.25V,
V
IN
= -7V
-0.8
mA
Receiver Differential Threshold
Voltage
V
TH
-7V
V
CM
12V -0.2
0.2
V
Receiver Input Hysteresis
V
TH
V
CM
= 0V
70
mV
Receiver Output High Voltage
V
OH
I
O
= -4mA, VID = 200mV
3.5
V
Receiver Output Low Voltage
V
OL
I
O
= 4mA, VID = -200mV
0.4
V
Three-State (high impedance)
Output Current at Receiver
I
OZR
0.4V
V
O
2.4V
1
A
Receiver Input Resistance
R
IN
-7V
V
CM
12V
k
2
ILX485
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V 5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1, 2)
PARAMETER SYMBOL
CONDITIONS MIN
TY
P
MAX
UNITS
DE = V
CC
500
900
RE
= 0V or V
CC
300
500
No-Load Supply Current
(Note 3)
I
CC
DE = 0V
A
Driver Short-Circuit Current,
I
OSD1
-7V
V
O
12V (Note 4)
35
250
mA
V
O
=
High
Driver Short-Circuit Current,
I
OSD2
-7V
V
O
12V (Note 4)
35
250
mA
V
O
=
Low
Receiver Short-Circuit Current
I
OSR
0V
V
O
V
CC
7
95
mA
SWITCHING CHARACTERISTICS
(V
CC
= 5V 5%, T
A
= T
MIN
to T
MAX
, unless otherwise noted.) (Notes 1, 2)
PARAMETER SYMBOL
CONDITIONS MIN
TYP
MAX
UNITS
t
PLH
R
DIFF
= 54
10 30 60
Driver Input to Output
t
PHL
C
L1
= C
L2
= 100pF
10
30
60
ns
Driver Output Skew to Output
t
SKEW
R
DIFF
= 54
, CL1 = CL2 = 100pF
5 10
ns
Driver Enable to Output High
t
ZH
C
L
= 100pF, S2 closed
40
70
ns
Driver Enable to Output Low
t
ZL
C
L
= 100pF, S1 closed
40
70
ns
Driver Disable Time from Low
t
LZ
C
L
= 15pF, S1 closed
40
70
ns
Driver Disable Time from High
t
HZ
C
L
= 15pF, S2 closed
40
70
ns
| tPLH - tPHL | Differential
t
SKD
R
DIFF
= 54
13 ns
Receiver Skew
C
L1
= C
L2
=
100pF
Receiver Enable to Output Low
t
ZL
C
RL
= 15pF, S1 closed
20
50
ns
Receiver Enable to Output High
t
ZH
C
RL
= 15pF, S2 closed
20
50
ns
Receiver Disable Time from
Low
t
LZ
C
RL
= 15pF, S1 closed
20
50
ns
Receiver Disable Time from
High
t
HZ
C
RL
= 15pF, S2 closed
20
50
ns
Maximum Data Rate
f
MAX
2.5 Mbps
3
ILX485
4
ILX485
Operation timing diagrams of ILX 485
Table of ILX 485 operation
Transmitting
Receiving
Inputs
Outputs X
Inputs
Outputs
RE
DE
DI
Z
Y
RE
DE
A-B
RO
X
1
1
0
1
0
0
+0.2V
1
X 1 0 1 0 0 0
-0.2V
0
0 0 X Z Z 0 0
open 1
1 0 X Z Z 1 0 X Z
X-don't care
Z-high impedance
5
ILX485
N SUFFIX PLASTIC DIP
(MS 001BA)
Symbol
MIN
MAX
A
8.51
10.16
B
6.1
7.11
C
5.33
D
0.36
0.56
F
1.14
1.78
G
H
J
0
10
K
2.92
3.81
NOTES:
L
7.62
8.26
1.
Dimensions "A", "B" do not include mold flash or protrusions.
M
0.2
0.36
Maximum mold flash or protrusions 0.25 mm (0.010) per side.
N
0.38
D SUFFIX SOIC
(MS - 012AA)
Symbol
MIN
MAX
A
4.8
5
B
3.8
4
C
1.35
1.75
D
0.33
0.51
F
0.4
1.27
G
H
J
0
8
NOTES:
K
0.1
0.25
1.
Dimensions A and B do not include mold flash or protrusion.
M
0.19
0.25
2.
Maximum mold flash or protrusion 0.15 mm (0.006) per side
P
5.8
6.2
for A; for B 0.25 mm (0.010) per side.
R
0.25
0.5
1.27
5.72
Dimension, mm
Dimension, mm
2.54
7.62
A
B
H
C
K
C M
J
F
M
P
G
D
R x 45
SEATING
PLANE
0.25 (0.010) M T
-T-
1
8
4
5
L
H
M
J
A
B
F
G
D
SEATING
PLANE
N
K
0.25 (0.010) M T
-T-
C
1
8
4
5
6
PDF 
ZIP