LTC1520 Datasheet, PDF (1/8 Pages) Linear Technology – 50Mbps Precision Quad Line Receiver

FEATURES
s _{Precision Propagation Delay: 18ns ±3ns Over}
Temperature
s _{Data Rate: 50Mbps}
s _{Low tPLH/tPHL Skew: 500ps Typ}
s _{Low Channel-to-Channel Skew: 400ps Typ}
s _{Rail-to-Rail Input Common Mode Range}
s _{High Input Resistance: ≥ 18k, Even When Unpowered}
s _{Hot Swap Capable}
s _{Can Withstand Input DC Levels of ±10V}
s _{Short-Circuit Protected}
s _{Single 5V Supply}
s _{LVDS Compatible}
s _{Will Not Oscillate with Slow Input Signals}
U
APPLICATIONS
s _{High Speed Backplane Interface}
s _{Line Collision Detector}
s _{PECL and LVDS Line Receivers}
s _{Level Translator}
s _{Ring Oscillator}
s _{Tapped Delay Line}
, LTC and LT are registered trademarks of Linear Technology Corporation.
Final Electrical Specifications
LTC1520
50Mbps Precision Quad
Line Receiver
DESCRIPTION
May 1996
The LTC^®1520 is a high speed, precision differential line
receiver that can operate at data rates as high as 50Mbps.
A unique architecture provides very stable propagation
delays and low skew over a wide input common mode,
input overdrive and ambient temperature range. Propaga-
tion delay is 18ns ±3ns, while typically t_PLH/t_PHL skew is
500ps and channel-to-channel skew is 400ps.
Each receiver translates differential input levels (V_ID ≥
100mV) into valid CMOS and TTL output levels. Its high
input resistance (≥18k) allows many receivers to be con-
nected to the same driver. The receiver outputs go into a
high impedance state when disabled.
Protection features include thermal shutdown and a con-
trolled maximum short-circuit current (50mA max) that
does not oscillate in and out of short-circuit mode. Input
resistance remains ≥18k when the device is unpowered or
disabled, thus allowing the LTC1520 to be hot swapped into
a backplane without loading the data lines.
The LTC1520 operates from a single 5V supply and draws
12mA of supply current. The part is available in a 16-lead
narrow SO package.
TYPICAL APPLICATION
High Speed Backplane Receiver
LTC1520
+
+
–
–
+
–
+
Propagation Delay Guaranteed to Fall
Within Shaded Area (±3ns)
V_IN =
1V/DIV
V_OUT =
5V/DIV
RECEIVER
OUTPUT
V_DD = 5V
RECEIVER
INPUT
V_ID = 500mV
–
5V
– 5 0 5 10 15 20 25 30 35 40 45
3.3k
TIME (ns)
LTC1520 TA02
3.3k
0.01µF
LTC1520 TA01
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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