LTC1518 Linear Technology, LTC1518 Datasheet

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LTC1518

Manufacturer Part Number
LTC1518
Description
52Mbps Precision Delay RS485 Quad Line Receivers
Manufacturer
Linear Technology
Datasheet

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FEATURES
APPLICATIONS
Hot Swap is a trademark of Linear Technology Corporation.
TYPICAL
, LTC and LT are registered trademarks of Linear Technology Corporation.
Precision Propagation Delay: 18.5ns 3.5ns Over
Temperature
High Data Rate: 52Mbps
Low t
Low Channel-to-Channel Skew: 500ps Typ
–7V to 12V RS485 Input Common Mode Range
Input Resistance 22k, Even When Unpowered
Guaranteed Fail-Safe Operation over the Entire
Common Mode Range
Hot Swap
High Common Mode Rejection to 26MHz
Short-Circuit Protection: 10mA Typ Output Current
for an Indefinite Short
Three-State Output Capability
Will Not Oscillate with Slow Moving Input Signals
Single 5V Supply
Pin Compatible with LTC488, LTC489
High Speed RS485/RS422 Receivers
STS-1/OC-1 Data Receivers
PECL Line Receivers
Level Translators
Fast-20/Fast-40 SCSI Receiver
RO
DI
PLH
LTC1685
1
4
RE
DE
52Mbps Data Communication over Twisted Pair
/t
2
3
TM
PHL
7
6
APPLICATION
Capable
Skew: 500ps Typ
U
100
EN
EN
12
4
A 1
RO
3
U
2 B
1/4 LTC1518
100
6
7
LTC1685
1518/19 F08
2
3
RE
DE
1
4
RO
DI
DESCRIPTION
The LTC
differential quad bus/line receivers that can operate at data
rates as high as 52Mbps. They are pin compatible with the
LTC488/LTC489 RS485 line receivers and operate over the
entire – 7V to 12V common mode range. A unique architec-
ture provides very stable propagation delays and low skew
over wide input common mode, input overdrive and ambi-
ent temperature ranges. Propagation delay is 18.5ns
500ps.
Each receiver translates differential input levels ( V
300mV) into valid CMOS and TTL output levels. Its high
input resistance ( 22k) allows many receivers to be con-
nected to the same driver. The receiver outputs go into a
high impedance state when disabled.
The receivers have a fail-safe feature that guarantees a high
output state when the inputs are shorted or left floating.
Other protection features include thermal shutdown and a
controlled maximum short-circuit current (50mA Max).
Input resistance remains
unpowered or disabled, thus allowing hot swapping with-
out loading the data lines.
The LTC1518/LTC1519 operate from a single 5V supply
and draw 12mA of supply current.
3.5ns. Typical t
RS485 Quad Line Receivers
®
1518/LTC1519 are high speed, precision delay
52Mbps Precision Delay
3V/DIV
5V/DIV
V
OUT
V
IN
Propagation Delay Guaranteed to Fall
=
=
– 5
PLH
Within Shaded Area ( 3.5ns)
RECEIVER
U
0
/t
V
OUTPUT
DD
PHL
5
= 5V
LTC1518/LTC1519
10
and channel-to-channel skew is
15
TIME (ns)
22k when the device is
20
25
30
RECEIVER
V
ID
INPUT
= 1.5V
35
1518/19 TA02
40 45
ID
1

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LTC1518 Summary of contents

Page 1

... Other protection features include thermal shutdown and a controlled maximum short-circuit current (50mA Max). Input resistance remains unpowered or disabled, thus allowing hot swapping with- out loading the data lines. The LTC1518/LTC1519 operate from a single 5V supply and draw 12mA of supply current ...

Page 2

... Receiver Input Differential ....................................... 10V Short-Circuit Duration .................................... Indefinite Operating Temperature Range .................... Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 ORDER PART NUMBER LTC1518CS OUT 1 3 EN12 4 OUT GND 8 16-LEAD PLASTIC SO T ...

Page 3

... Note 6: Maximum difference between any two t single package over the full operating temperature range. Note 7: Short-circuit current does not represent output drive capability. When the output detects a short-circuit condition, output drive current is significantly reduced until the short is removed LTC1518/LTC1519 MIN TYP MAX 25 2 ...

Page 4

... Common Mode 1. 205 –6 –4 – COMMON MODE (V) Maximum Data Rate vs Input Differential Voltage 2. 0.3 0.5 1.0 1.5 2.0 2.5 INPUT DIFFERENTIAL (V) LTC1518/19 • TPC10 40 50 LTC1518/19 • TPC05 LTC1464 • TPC08 ...

Page 5

... OUT 2 (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 LTC1518 applications. B3 (Pin 9): Receiver 3 Inverting Input. A3 (Pin 10): Receiver 3 Noninverting Input. OUT 3 (Pin 11): Receiver 3 Output. EN (Pin 12): A low enables all outputs; a low on Pin 4 and a high on Pin 12 will put all outputs into a high impedance state ...

Page 6

... LTC1518/LTC1519 U W SWITCHI WAVEFOR S + INPUT 1/4 LTC1518 LTC1519 – 2.5V 4V 2.5V 2.5V INPUT t t PLH PHL V /2 OUTPUT DD Figure 1. Propagation Delay Test Circuit and Waveforms INPUT A1, A2 CH1 OUT CH2 OUT Figure 3. Any Channel to Any Channel Skew, Same Package V ID PACKAGE 1 PACKAGE 3ns for all input and enable signals ...

Page 7

... Figure 5. Input Thevenin Equivalent W U Fail-Safe Features The LTC1518/LTC1519 have a fail-safe feature that guar- antees the output logic HIGH state when the inputs are either shorted or left open (note that when inputs are left open, any external large leakage current might override the fail-safe) ...

Page 8

... In such applications, standard high speed CMOS logic may be used as a driver for the LTC1518/ LTC1519. With a 22k minimum input resistance, the receiver trip points may be easily adjusted to accommo- ...

Page 9

... Differential Transmission Data rates up to 52Mbps can be transmitted over 100 feet of high quality category 5 twisted pair. Figure 8 shows the LTC1518 receiving differential data from an LTC1685 transceiver the single-ended configurations, care must be taken to properly terminate the differential data lines to avoid unwanted reflections, etc. ...

Page 10

... INFORMATION Figure 9 shows a trace with 100ft category 5 UTP between an LTC1685 driver and an LTC1518 receiver. Notice that at the far end of the cable, the signal to the LTC1518 input has been reduced. Figure 10 shows a 52Mbps square wave. Output Short-Circuit Protection The LTC1518/LTC1519 employ voltage sensing short- circuit protection at the output terminals ...

Page 11

... DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE LTC1518/LTC1519 0.386 – 0.394* (9.804 – 10.008 0.150 – 0.157** (3.810 – 3.988) ...

Page 12

... C2 0.33 F LTC1518 – – – – 8 LTC1518 – – – – 8 COMMENTS 10Mbps, – 12V Common Mode Range 10Mbps, – 12V Common Mode Range Single 5V Supply, 10ns Propagation Delay 52Mbps, 100mV Threshold, Rail-to-Rail Common Mode ...

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