LTC1480 Linear Technology, LTC1480 Datasheet
LTC1480
Manufacturer Part Number
LTC1480
Description
3.3V Ultra-Low Power RS485 Transceiver
Manufacturer
Linear Technology
Datasheet
1.LTC1480.pdf
(8 pages)
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FEATURE
A
RO
RE
DE
D1
TYPICAL
PPLICATI
Battery-Powered RS485/RS422 Applications
Low Power RS485/RS422 Transceiver
Level Translator
True RS485 from a Single 3.3V Supply
Low Power: I
I
1 A Quiescent in Shutdown Mode
ESD Protection to 10kV on Receiver Inputs and
Driver Outputs
–7V to 12V Common-Mode Range Permits 7V
Ground Difference Between Devices on the Data Line
Thermal Shutdown Protection
Power Up/Down Glitch-Free Driver Outputs Permit
Live Insertion or Removal of Transceiver
Driver Maintains High Impedance in Three-State or
with the Power Off
Up to 32 Transceivers on the Bus
50ns Typical Driver Propagation Delays with
10ns Skew
Pin Compatible with the LTC485
1
2
3
4
CC
= 600 A Max with Driver Enabled, No Load
LTC1480
D
R
8
7
6
5
S
A
3.3V
CC
B
A
O
PPLICATI
= 500 A Max with Driver Disabled
120
U
S
SHIELD
O
3.3V RS485 Network
3.3V
U
8
1
RO RE
R
B
7
2
6
3
A
DE D1
D
5
4
SHIELD
LTC1480
120
D
The LTC
ceiver which provides full RS485 compatibility while oper-
ating from a single 3.3V supply. It is designed for data
transmission standard RS485 applications with extended
common-mode range (12V to –7V). It also meets the
requirements of RS422 and features high speed operation
up to 2.5Mb/s. The CMOS design offers significant power
savings without sacrificing ruggedness against overload
or ESD damage. Typical quiescent current is only 300 A
while operating and 1 A in shutdown.
The driver and receiver feature three-state outputs, with
the driver outputs maintaining high impedance over the
entire common-mode range. Excessive power dissipation
caused by bus contention or faults is prevented by a
thermal shutdown circuit which forces the driver outputs
into a high impedance state. The receiver has a fail-safe
feature which guarantees a high output state when the
inputs are left open. I/O pins are protected against multiple
ESD strikes of up to 10kV.
The LTC1480 is fully specified over the commercial and
extended industrial temperature range. The LTC1480 is
available in 8-pin SO and DIP packages.
B
A
3.3V
, LTC and LT are registered trademarks of Linear Technology Corporation.
ESCRIPTIO
8
7
6
5
LTC1480
LTC1480 • TA01
®
R
1480 is an ultra-low power differential line trans-
D
1
2
3
4
RO
RE
DE
D1
3.3V Ultra-Low Power
U
RS485 Transceiver
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
Output Voltage vs Output Current
0
10
Driver Differential
20
OUTPUT CURRENT (mA)
30
40 50
LTC1480
60
V
T
A
CC
70 80
= 25 C
LTC1480 • TA02
= 3.3V
90
1
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