LTC1686/LTC1687
52Mbps Precision Delay
RS485 Fail-Safe Transceivers
FEATURES
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DESCRIPTION
The LTC
廬
1686/LTC1687 are high speed, precision delay,
full-duplex RS485 transceivers that can operate at data
rates as high as 52Mbps. The devices also meet 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 LTC1686/LTC1687 RS485 transceivers guarantee
receiver fail-safe operation over the
entire
common mode
range (鈥?7V to 12V). Receiver input resistance remains
鈮?/div>
22k when the device is unpowered or disabled.
The LTC1686/LTC1687 operate from a single 5V supply
and draw 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 Operation Over the Entire
Common Mode Range
High 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 LTC490/LTC491
45dB CMRR at 26MHz
APPLICATIONS
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High Speed RS485/RS422 Full Duplex Transceivers
Level Translator
Backplane Transceiver
STS-1/OC-1 Data Transceiver
Signal Repeaters
TYPICAL APPLICATION
LTC1686
5
D
3
DRIVER
100鈩?/div>
6
100鈩?/div>
RECEIVER
R
LTC1686
2V/DIV
CABLE DELAY
1V/DIV
8
R
2
RECEIVER
100鈩?/div>
7
100鈩?/div>
DRIVER
D
5V/DIV
400 FT OF CATEGORY 5 UTP
LTC1686/87 鈥?TA01
U
U
U
10Mbps Data Pulse
400 Feet Category 5 UTP
DRIVER INPUT
RECEIVER
INPUT
RECEIVER
OUTPUT
100ns/DIV
1686/87 TA02
1
LTC1687相關(guān)型號PDF文件下載
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