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LTC1685 Datasheet

  • LTC1685

  • 52Mbps, Precision Delay, RS485 Fail-Safe Transceiver

  • 12頁

  • LINER

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LTC1685
52Mbps, Precision Delay,
RS485 Fail-Safe Transceiver
FEATURES
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DESCRIPTION
The LTC
廬
1685 is a high speed, precision delay RS485
transceiver that can operate at data rates as high as 52Mbps.
The device also meets the requirements of RS422.
A unique architecture provides very stable propagation
delays and low skew over a wide common mode and
ambient temperature range.
The driver and receiver feature three-state outputs, with
disabled driver outputs maintaining high impedance over
the entire common mode range. A short circuit feature
detects shorted outputs and substantially reduces driver
output current. A similar feature also protects the receiver
output from short circuits. Thermal shutdown circuitry
protects from excessive power dissipation.
The receiver has a fail-safe feature that guarantees a high
output state when the inputs are shorted or are left floating.
The LTC1685 RS485 transceiver guarantees receiver fail-
safe operation over the
entire
common mode range (鈥?7V
to 12V). Input resistance will remain
鈮?/div>
22k when the device
is unpowered or disabled.
The LTC1685 operates from a single 5V supply and draws
only 7mA of supply current.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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Precision Propagation Delay Over Temperature:
Receiver/Driver: 18.5ns
鹵
3.5ns
High Data Rate:
52Mbps
Low t
PLH
/t
PHL
Skew:
Receiver/Driver: 500ps Typ
鈥?V to 12V RS485 Input Common Mode Range
Guaranteed Fail-Safe Receiver Operation Over the
Entire Common Mode Range
High Receiver Input Resistance:
鈮?/div>
22k, Even When
Unpowered
Short-Circuit Protected
Thermal Shutdown Protected
Driver Maintains High Impedance in Three-State or
with Power Off
Single 5V Supply
Pin Compatible with LTC485
45dB CMRR at 26MHz
APPLICATIONS
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s
s
s
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High Speed RS485/RS422 Transceivers
Level Translator
Backplane Transceiver
STS-1/OC-1 Data Transceiver
Fast-20, Fast-40 SCSI Transceivers
TYPICAL APPLICATION
RO1
R
RE1
DE1
DI1
D
GND1
1V/DIV
10Mbps Data Pulse
400ft Category 5 UTP
V
CC1
Rt
2V/DIV
DRIVER INPUT
CABLE DELAY
RO2
R
RE2
DE2
DI2
D
Rt
V
CC2
5V/DIV
RECEIVER
OUTPUT
GND2
1685 TA01
U
U
U
RECEIVER
INPUT
100ns/DIV
1685 TA02
1

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