LTC1518_1 LINER [Linear Technology], LTC1518_1 Datasheet

LTC1518_1

Manufacturer Part Number

LTC1518_1

Description

52Mbps Precision Delay RS485 Quad Line Receivers

Manufacturer

LINER [Linear Technology]

Datasheet

1.LTC1518_1.pdf (12 pages)

Current page: 1 of 12
Download datasheet (185Kb)

FEATURES

TYPICAL APPLICATIO

APPLICATIO S

Hot Swap is a trademark of Linear Technology Corporation.

, LTC and LT are registered trademarks of Linear Technology Corporation.

Precision Propagation Delay: 18.5ns 3.5ns Over

0 C to 70 C Temperature Range

High Data Rate: 52Mbps

Low t

Low Channel-to-Channel Skew: 500ps Typ

Guaranteed Fail-Safe Operation over the Entire

Common Mode Range

–7V to 12V RS485 Input Common Mode Range

Input Resistance 22k, Even When Unpowered

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

LTC1685

52Mbps Data Communication over Twisted Pair

PLH

PHL

Capable

100

Skew: 500ps Typ

A 1

2 B

1/4 LTC1518

100

LTC1685

1518/19 F08

DESCRIPTIO

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 3.5ns

over the commercial temperature range. Typical t

and channel-to-channel skew is 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.

RS485 Quad Line Receivers

3V/DIV

5V/DIV

OUT

1518/LTC1519 are high speed, precision delay

52Mbps Precision Delay

Propagation Delay Guaranteed to Fall

– 5

Within Shaded Area ( 3.5ns)

RECEIVER

= 0 C TO 70 C

OUTPUT

= 5V

LTC1518/LTC1519

TIME (ns)

22k when the device is

RECEIVER

INPUT

= 1.5V

1518/19 TA02

40 45

PLH

PHL

Related parts for LTC1518_1

LTC1518_1 Summary of contents

Page 1

FEATURES Precision Propagation Delay: 18.5ns 3.5ns Over Temperature Range High Data Rate: 52Mbps Low t /t Skew: 500ps Typ PLH PHL Low Channel-to-Channel Skew: 500ps Typ Guaranteed Fail-Safe Operation over the Entire Common Mode Range ...

Page 2

LTC1518/LTC1519 ABSOLUTE AXI U RATI GS (Note 1) Supply Voltage ....................................................... 10V Digital Input Currents ..................... – 100mA to 100mA Digital Input Voltages ............................... – 0.5V to 10V Receiver Input Voltages ........................................ 14V Receiver Output Voltages ............. ...

Page 3

DC ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER Max V for Fail-Safe Detection ID Min Time to Detect Fault Condition CMRR Common Mode Rejection Ratio U W SWITCHI CHARACTERISTICS The denotes specifications which ...

Page 4

LTC1518/LTC1519 W U TYPICAL PERFOR A CE CHARACTERISTICS CMRR vs Frequency 46.5 46.0 45.5 45.0 44.5 44.0 43 2. 100k 10M FREQUENCY (Hz) 15189 G01 Supply Current ...

Page 5

CTIO S LTC1518 B1 (Pin 1): Receiver 1 Inverting Input. A1 (Pin 2): Receiver 1 Noninverting Input. OUT 1 (Pin 3): Receiver 1 Output. EN (Pin 4): A high enables all outputs; a low on ...

Page 6

LTC1518/LTC1519 U W SWITCHI WAVEFOR S + INPUT 1/4 LTC1518 LTC1519 – 2.5V 4V INPUT 2. PLH PHL OUTPUT Figure 1. Propagation Delay Test Circuit and Waveforms INPUT A1, A2 CH1 OUT ...

Page 7

U U EQUIVALE T I PUT NETWORKS APPLICATIO S I FOR ATIO Theory of Operation Unlike typical line receivers whose propagation delay can vary by as much as 500% from package to package and show significant ...

Page 8

LTC1518/LTC1519 U U APPLICATIO S I FOR ATIO When the inputs are accidentally shorted (by cutting through a cable, for example), the short-circuit fail-safe feature will guarantee a high output logic level. Note also that if the line driver is ...

Page 9

U U APPLICATIO S I FOR ATIO Note that due to the increased skew, this configuration might not operate at the highest data rates. To transmit single-ended data over short to medium distances, twisted pair is recommended with the unused ...

Page 10

LTC1518/LTC1519 U U APPLICATIO S I FOR ATIO 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 ...

Page 11

PACKAGE DESCRIPTIO 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 ** DIMENSION DOES ...

Page 12

LTC1518/LTC1519 U TYPICAL APPLICATIO BACK PLUG-IN PLANE V CC ON/RESET GND 8 DATA BUS RELATED PARTS PART NUMBER DESCRIPTION LTC486/LTC487 Low Power Quad RS485 Drivers LTC488/LTC489 Low Power Quad RS485 Receivers ® 1016 UltraFast Precision Comparator LTC1520 High ...

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