LTC1520_15 Datasheet, PDF (1/8 Pages) Linear Technology – 50Mbps Precision Quad Line Receiver

LTC1520
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.
DESCRIPTION
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)
5V
3.3k
3.3k
0.01µF
1520 TA01
V_IN =
1V/DIV
V_OUT =
5V/DIV
RECEIVER
OUTPUT
V_DD = 5V
RECEIVER
INPUT
V_ID = 500mV
–5 0
5 10 15 20 25 30 35 40 45
TIME (ns)
LTC1520 TA02
1