Receiver Output Voltages .............. –0.5V to V
CC
+ 0.5V
Operating Temperature Range
LTC1485C .............................................. 0°C to 70°C
LTC1485I ........................................... –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec.) ................ 300°C
5 GND
S8 PACKAGE
N8 PACKAGE
8-LEAD PLASTIC DIP 8-LEAD PLASTIC SOIC
T
JMAX
= 125°C,
θ
JA
= 100°C/W (N)
T
JMAX
= 150°C,
θ
JA
= 150°C/W (S)
ORDER INFORMATION
LEAD FREE FINISH
LTC1485CN8
LTC1485IN8
LTC1485CS8
LTC1485IS8
TAPE AND REEL
LTC1485CN8
LTC1485IN8
LTC1485CS8
LTC1485IS8
PART MARKING*
1485
1485I
1485
1485I
PACKAGE DESCRIPTION
8-Lead Plastic DIP
8-Lead Plastic DIP
8-Lead Plastic SOIC
8-Lead Plastic SOIC
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
2
1485fb
For more information
www.linear.com/LTC1485
LTC1485
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V (Notes 2, 3).
SYMBOL
V
OD1
V
OD2
∆V
OD
V
OC
∆|V
OC
|
V
INH
V
INL
I
IN1
I
IN2
V
TH
∆V
TH
V
OH
V
OL
I
OZR
I
CC
R
IN
I
OSD1
I
OSD2
I
OSR
PARAMETER
Differential Driver Output Voltage (Unloaded)
Differential Driver Output Voltage (With Load)
CONDITIONS
I
O
= 0
R = 50Ω, (RS422)
R = 27Ω, (RS485) (Figure 1)
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
1.8
1.7
DC ELECTRICAL CHARACTERISTICS
MIN
2
1.5
TYP
5
MAX
UNITS
V
V
V
V
V
V
V
5
0.2
3
0.2
Change in Magnitude of Driver Differential
R = 27Ω or R = 50Ω (Figure 1)
Output Voltage for Complementary Output States
Driver Common-Mode Output Voltage
R = 27Ω or R = 50Ω (Figure 1)
Change in Magnitude of Driver Common-Mode
R = 27Ω or R = 50Ω (Figure 1)
Output Voltage for Complementary Output States
Input High Voltage
Input Low Voltage
Input Current
Input Current (A, B)
Differential Input Threshold Voltage for Receiver
Receiver Input Hysteresis
Receiver Output High Voltage
Receiver Output Low Voltage
Three-State Output Current at Receiver
Supply Current
DI, DE,
RE
DI, DE,
RE
DI, DE,
RE
V
CC
= 0V or 5.25V, V
IN
= 12V
V
CC
= 0V or 5.25V, V
IN
= −7V
–7V ≤ V
CM
≤ 12V
V
CM
= 0V
I
O
= –4mA, V
ID
= 0.2V
I
O
= 4mA, V
ID
= –0.2V
V
CC
= Max 0.4V ≤ V
O
≤ 2.4V
No Load; DI = GND or V
CC
Outputs Enabled
Outputs Disabled
–7V ≤ V
CM
≤ 12V
V
O
= –7V
V
O
= 10 V
0V ≤ V
O
≤ V
CC
2.0
0.8
±2
1.0
−0.8
−0.2
60
3.5
0.4
±1
2.3
2.3
V
µA
mA
mA
V
mV
V
V
µA
mA
mA
kΩ
mA
mA
mA
0.2
Receiver Input Resistance
Driver Short-Circuit Current, V
OUT
= High
Driver Short-Circuit Current, V
OUT
= Low
Receiver Short-Circuit Current
12
250
250
7
85
1485fb
For more information
www.linear.com/LTC1485
3
LTC1485
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V (Notes 2, 3).
SYMBOL
t
PLH
t
PHL
t
SKEW
t
r
, t
f
t
ZH
t
ZL
t
LZ
t
HZ
t
PLH
t
PHL
t
SKEW
t
ZL
t
ZH
t
LZ
t
HZ
PARAMETER
Driver Input to Output
Driver Input to Output
Driver Output to Output
Driver Rise or Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
Receiver Input to Output
Receiver Input to Output
| t
PLH
– t
PHL
|
Differential Receiver Skew
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable from Low
Receiver Disable from High
CONDITIONS
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
(Figures 2, 5)
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
(Figures 2, 5)
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
(Figures 2, 5)
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF
(Figures 2, 5)
C
L
= 100pF (Figures 4, 6) S2 Closed
C
L
= 100pF (Figures 4, 6) S1 Closed
C
L
= 15pF (Figures 4, 6) S1 Closed
C
L
= 15pF (Figures 4, 6) S2 Closed
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF (Figures 2, 7)
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF (Figures 2, 7)
R
DIFF
= 54Ω, C
L1
= C
L2
= 100pF (Figures 2, 7)
C
L
= 15pF (Figures 3, 8) S1 Closed
C
L
= 15pF (Figures 3, 8) S2 Closed
C
L
= 15pF (Figures 3, 8) S1 Closed
C
L
= 15pF (Figures 3, 8) S2 Closed
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
SWITCHING CHARACTERISTICS
MIN
10
10
TYP
30
30
4
MAX
50
50
10
25
70
70
70
70
50
55
15
45
45
45
45
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
5
15
40
40
40
40
15
20
25
30
5
30
30
30
30
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All currents into device pins are positive. All currents out of device
pins are negative. All voltages are referenced to device ground unless
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Embedded System
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