LTC1686 Просмотр технического описания (PDF) - Linear Technology
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LTC1686 Datasheet PDF : 12 Pages
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LTC1686/LTC1687
52Mbps Precision Delay
RS485 Fail-Safe Transceivers
FEATURES
s Precision Propagation Delay Over Temperature:
Receiver/Driver: 18.5ns ±3.5ns
s High Data Rate: 52Mbps
s Low tPLH/tPHL Skew:
Receiver/Driver: 500ps Typ
s –7V to 12V RS485 Input Common Mode Range
s Guaranteed Fail-Safe Operation Over the Entire
Common Mode Range
s High Input Resistance: ≥ 22k, Even When Unpowered
s Short-Circuit Protected
s Thermal Shutdown Protected
s Driver Maintains High Impedance in Three-State or
with Power Off
s Single 5V Supply
s Pin Compatible with LTC490/LTC491
s 45dB CMRR at 26MHz
U
APPLICATIONS
s High Speed RS485/RS422 Full Duplex Transceivers
s Level Translator
s Backplane Transceiver
s STS-1/OC-1 Data Transceiver
s Signal Repeaters
DESCRIPTION
The LTC®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 (– 7V to 12V). Receiver input resistance remains
≥ 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.
TYPICAL APPLICATION
LTC1686
3
D
DRIVER
5
100Ω
6
100Ω
2
R
RECEIVER
8
100Ω
7
100Ω
400 FT OF CATEGORY 5 UTP
LTC1686
RECEIVER
10Mbps Data Pulse
400 Feet Category 5 UTP
2V/DIV
R
1V/DIV
CABLE DELAY
DRIVER INPUT
RECEIVER
INPUT
DRIVER
D
5V/DIV
RECEIVER
OUTPUT
LTC1686/87 • TA01
100ns/DIV
1686/87 TA02
1
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