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LTC1485CS8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P14
LTC1485
1
1485fb
For more information www.linear.com/LTC1485
TYPICAL APPLICATION
FEATURES DESCRIPTION
Differential
Bus Transceiver
The LT C
®
1485 is a low power differential bus/line trans-
ceiver designed for multipoint data transmission standard
RS485 applications with extended common-mode range
(12V to –7V). It also meets the requirements of RS422.
The CMOS with Schottky design offers significant power
savings over its bipolar counterpart without sacrificing
ruggedness against overload or ESD damage.
The driver and receiver feature three-state outputs, with
the driver outputs maintaining high impedance over the
entire common-mode range. Excessive power dissipa-
tion caused by bus contention or faults is prevented by a
thermal shutdown circuit which forces the driver outputs
into a high impedance state. I/O pins are protected against
multiple ESD strikes of over ±10kV.
The receiver has a fail-safe feature which guarantees a
high output state when the inputs are left open.
Both AC and DC specifications are guaranteed from –40°C
to 85°C and 4.75V to 5.25V supply voltage range.
APPLICATIONS
n
ESD Protection Over ±10kV
n
Low Power: I
CC
= 1.8mA Typ
n
28ns Typical Driver Propagation Delays
with4nsSkew
n
Designed for RS485 or RS422 Applications
n
Single 5V Supply
n
−7V to 12V Bus Common-Mode Range Permits
±7VGround Difference Between Devices on the Bus
n
Thermal Shutdown Protection
n
Power-Up/Down Glitch-Free Driver Outputs
n
Driver Maintains High Impedance in Three-State or
with the Power Off
n
Combined Impedance of a Driver Output and
ReceiverAllows up to 32 Transceivers on the Bus
n
60mV Typical Input Hysteresis
n
Pin-Compatible with the SN75176A, DS75176A,
andSN75LBC176
n
Low Power RS485/RS422 Transceiver
n
Level Translator
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
DI
RO
4
3
6
7
2
DE
120Ω
120Ω
DRIVER
RECEIVER
DE
3
4
RO
DI
2
1
6
7
4000 FT 24 GAUGE TWISTED PAIR
1485 TA01
LTC1485 LTC1485
RECEIVER
DRIVER
RE
RE
8
5V
8
5V
5
5
1
LTC1485
2
1485fb
For more information www.linear.com/LTC1485
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
(Note 1)
1
2
3
4 5
6
7
8
TOP VIEW
RO
B
V
CC
N8 PACKAGE
8-LEAD PLASTIC DIP
D
R
A
GND
DE
DI
S8 PACKAGE
8-LEAD PLASTIC SOIC
RE
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 TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC1485CN8 LTC1485CN8 1485 8-Lead Plastic DIP 0°C to 70°C
LTC1485IN8 LTC1485IN8 1485I 8-Lead Plastic DIP –40°C to 85°C
LTC1485CS8 LTC1485CS8 1485 8-Lead Plastic SOIC 0°C to 70°C
LTC1485IS8 LTC1485IS8 1485I 8-Lead Plastic SOIC –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.
Supply Voltage (V
CC
) ............................................... 12V
Control Input Voltages
................... –0.5V to V
CC
+ 0.5V
Control Input Currents
......................... –50mA to 50mA
Driver Input Voltages
..................... –0.5V to V
CC
+ 0.5V
Driver Input Currents
........................... –25mA to 25mA
Driver Output Voltages
........................................... ±14V
Receiver Input Voltages
........................................ ±14V
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
LTC1485
3
1485fb
For more information www.linear.com/LTC1485
DC ELECTRICAL CHARACTERISTICS
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 PARAMETER CONDITIONS MIN TYP MAX UNITS
V
OD1
Differential Driver Output Voltage (Unloaded) I
O
= 0
l
5 V
V
OD2
Differential Driver Output Voltage (With Load) R = 50Ω, (RS422)
R = 27Ω, (RS485) (Figure 1)
l
l
2
1.5
5
V
V
∆V
OD
Change in Magnitude of Driver Differential
Output Voltage for Complementary Output States
R = 27Ω or R = 50Ω (Figure 1)
l
0.2 V
V
OC
Driver Common-Mode Output Voltage R = 27Ω or R = 50Ω (Figure 1)
l
3 V
∆|V
OC
| Change in Magnitude of Driver Common-Mode
Output Voltage for Complementary Output States
R = 27Ω or R = 50Ω (Figure 1)
l
0.2 V
V
INH
Input High Voltage DI, DE, RE
l
2.0 V
V
INL
Input Low Voltage DI, DE, RE
l
0.8 V
I
IN1
Input Current DI, DE, RE
l
±2 µA
I
IN2
Input Current (A, B) V
CC
= 0V or 5.25V, V
IN
= 12V
V
CC
= 0V or 5.25V, V
IN
= −7V
l
l
1.0
−0.8
mA
mA
V
TH
Differential Input Threshold Voltage for Receiver –7V ≤ V
CM
≤ 12V
l
−0.2 0.2 V
∆V
TH
Receiver Input Hysteresis V
CM
= 0V
l
60 mV
V
OH
Receiver Output High Voltage I
O
= –4mA, V
ID
= 0.2V
l
3.5 V
V
OL
Receiver Output Low Voltage I
O
= 4mA, V
ID
= –0.2V
l
0.4 V
I
OZR
Three-State Output Current at Receiver V
CC
= Max 0.4V ≤ V
O
≤ 2.4V
l
±1 µA
I
CC
Supply Current No Load; DI = GND or V
CC
Outputs Enabled
Outputs Disabled
l
l
1.8
1.7
2.3
2.3
mA
mA
R
IN
Receiver Input Resistance –7V ≤ V
CM
≤ 12V
l
12 kΩ
I
OSD1
Driver Short-Circuit Current, V
OUT
= High V
O
= –7V
l
250 mA
I
OSD2
Driver Short-Circuit Current, V
OUT
= Low V
O
= 10 V
l
250 mA
I
OSR
Receiver Short-Circuit Current 0V ≤ V
O
≤ V
CC
l
7 85 mA
P1-P3P4-P6P7-P9P10-P12P13-P14

LTC1485CS8#PBF

Mfr. #:
Buy LTC1485CS8#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-485 Interface IC High Speed RS485 Tx/Rx
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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