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LTC1687 Datasheet

52Mbps Precision Delay RS485 Fail-Safe Transceivers

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LTC1687 pdf
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
100
6
100
2
R
RECEIVER
8
100
7
100
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


Linear Technology Electronic Components Datasheet

LTC1687 Datasheet

52Mbps Precision Delay RS485 Fail-Safe Transceivers

No Preview Available !

LTC1687 pdf
LTC1686/LTC1687
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage (VDD) .............................................. 10V
Control Input Currents .................... – 100mA to 100mA
Control Input Voltages .................. – 0.5V to VDD + 0.5V
Driver Input Voltages .................... – 0.5V to VDD + 0.5V
Driver Output Voltages ................................. + 12V/– 7V
Receiver Input Voltages ................................ + 12V/– 7V
Receiver Output Voltages ............. – 0.5V to VDD + 0.5V
Receiver Input Differential ...................................... 10V
Driver Short-Circuit Duration
(VOUT: – 7V to 10V)...................................... Indefinite
Receiver Short-Circuit Duration
(VOUT: 0V to VDD) ........................................ Indefinite
Operating Temperature Range .................... 0°C to 70°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
VDD 1
R2
8A
R
7B
D3
GND 4
D
6Z
5Y
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 150°C/ W
ORDER PART
NUMBER
LTC1686CS8
S8 PART MARKING
1686
Consult factory for Industrial and Military grade parts.
TOP VIEW
NC 1
R2
RE 3
DE 4
D5
GND 6
GND 7
R
D
14 VDD
13 NC
12 A
11 B
10 Z
9Y
8 NC
S PACKAGE
14-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 90°C/ W
ORDER PART
NUMBER
LTC1687CS
DC ELECTRICAL CHARACTERISTICS VDD = 5V ± 5% unless otherwise noted (Notes 2, 3).
SYMBOL
VOD1
VOD2
PARAMETER
Differential Driver Output (Unloaded)
Differential Driver Output (With Load)
VOD
VOC
∆VOC
VIH
VIL
IIN1
IIN2
Change in Magnitude of Driver Differential
Output Voltage for Complementary
Output States
Driver Common Mode Output Voltage
Change in Magnitude of Driver Common
Mode Output Voltage for Complementary
Output States
Input High Voltage
Input Low Voltage
Input Current
Input Current (A, B)
VTH
VTH
VOH
Differential Input Threshold Voltage
for Receiver
Receiver Input Hysteresis
Receiver Output High Voltage
CONDITIONS
IOUT = 0
R = 50(RS422)
R = 27(RS485), Figure 1
R = 27or 50, Figure 1
R = 27or 50, VDD = 5V, Figure 1
R = 27or 50, Figure 1
D, DE, RE
D, DE, RE
D, DE, RE
VA, VB = 12V, VDD = 0V or 5.25V
VA, VB = – 7V, VDD = 0V or 5.25V
– 7V VCM 12V
VCM = 0V
IOUT = – 4mA, VID = 300mV
MIN TYP MAX
q
2.0
q 1.5
q
VDD
VDD
0.2
q2
q
3
0.2
q2
q
q –1
q
q – 500
q – 0.3
25
q 3.5 4.8
0.8
1
500
0.3
2
UNITS
V
V
V
V
V
V
V
V
µA
µA
µA
V
mV
V


Part Number LTC1687
Description 52Mbps Precision Delay RS485 Fail-Safe Transceivers
Maker Linear Technology
Total Page 12 Pages
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