LTC1520 Linear Technology, LTC1520 Datasheet

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LTC1520

Manufacturer Part Number
LTC1520
Description
50Mbps Precision Quad Line Receiver
Manufacturer
Linear Technology
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1520CS
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC1520CS#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
APPLICATIONS
FEATURES
TYPICAL
, LTC and LT are registered trademarks of Linear Technology Corporation.
Precision Propagation Delay: 18ns 3ns Over
Temperature
Data Rate: 50Mbps
Low t
Low Channel-to-Channel Skew: 400ps Typ
Rail-to-Rail Input Common Mode Range
High Input Resistance: 18k, Even When Unpowered
Hot Swap Capable
Can Withstand Input DC Levels of 10V
Short-Circuit Protected
Single 5V Supply
LVDS Compatible
Will Not Oscillate with Slow Input Signals
High Speed Backplane Interface
Line Collision Detector
PECL and LVDS Line Receivers
Level Translator
Ring Oscillator
Tapped Delay Line
PLH
/t
PHL
APPLICATION
High Speed Backplane Receiver
Skew: 500ps Typ
U
LTC1520
+
+
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.
U
+
+
5V
3.3k
3.3k
LTC1520 TA01
0.01 F
DESCRIPTION
The LTC
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
500ps and channel-to-channel skew is 400ps.
Each receiver translates differential input levels (V
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.
®
1V/DIV
5V/DIV
V
OUT
1520 is a high speed, precision differential line
V
50Mbps Precision Quad
IN
Propagation Delay Guaranteed to Fall
=
=
– 5
RECEIVER
0
Within Shaded Area ( 3ns)
V
OUTPUT
DD
5
= 5V
U
10
Final Electrical Specifications
15
TIME (ns)
20
Line Receiver
25
V
RECEIVER
ID
30
INPUT
= 500mV
35
LTC1520 TA02
40 45
PLH
LTC1520
/t
May 1996
PHL
skew is
ID
1

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LTC1520 Summary of contents

Page 1

... 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 ...

Page 2

... OUT OUT V 0.1V, No Load, Enable = 0V OUT OUT V = 2.5V 25MHz ORDER PART TOP VIEW NUMBER LTC1520CS OUT OUT PACKAGE = 150 MIN TYP MAX – 0.8 – 1 ...

Page 3

... Note 4: Guaranteed by design, but not tested. Note 5: Worst-case 5%. over the full operating temperature range. DD Note 6: Maximum difference between any two t single package over the full operating temperature range. ) PHL 100 125 LTC1520 G01 LTC1520 MIN TYP MAX 2.5 500 10 25 ...

Page 4

... A logic low input forces the receiver outputs into a high impedance state. Do not float. RO2 (Pin 5): Receiver 2 Output. A2 (Pin 6): Receiver 2 Noninverting Input. B2 (Pin 7): Receiver 2 Inverting Input. GND (Pin 8): Ground Pin. A ground plane is recommended for all LTC1520 applications SWITCHI WAVEFOR S INPUT 2.5V t ...

Page 5

... U falling output edges, and the propagation delays of any two receivers within a package are very tightly matched. The precision timing features of the LTC1520 reduce overall system timing constraints by providing a narrow 6ns window during which valid data appears at the re- ceiver output. This output timing window applies to all ...

Page 6

... In such applications, standard high speed CMOS logic may be used as a driver for the LTC1520. The receiver trip points may be easily adjusted to accommodate different driver output swings by changing the resistor divider at the fixed input ...

Page 7

... LTC1520 used as a tapped delay line with 18ns 3ns steps. Several LTC1520s may be connected in series to form longer delay lines. Each tap in the delay line is accurate to within 17% over temperature. As shown in Figure 10, the LTC1520 can be used to create a temperature stable ring oscillator with period increments 0ns DELAY INPUT 5V 3 ...

Page 8

... LTC1520 PACKAGE DESCRIPTION 0.010 – 0.020 45 (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.016 – 0.050 0.406 – 1.270 *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE RELATED PARTS PART NUMBER DESCRIPTION ...

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