LTC1687CS#PBF datasheet, PDF - EEWORLD Datasheet

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LTC1687CS#PBF: DescriptionIC TXRX RS485 PREC DELAY 14-SOIC; CategoryAnalog mixed-signal IC Drivers and interfaces; File Size177KB，12 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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LTC1687CS#PBF Overview

IC TXRX RS485 PREC DELAY 14-SOIC

LTC1687CS#PBF Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	conform to
Maker	Linear ( ADI )
Parts packaging code	SOIC
package instruction	SOP, SOP14,.25
Contacts	14
Manufacturer packaging code	S
Reach Compliance Code	compliant
ECCN code	EAR99
Differential output	YES
Number of drives	1
High level input current maximum value	0.000001 A
Input properties	DIFFERENTIAL SCHMITT TRIGGER
Interface integrated circuit type	LINE TRANSCEIVER
Interface standards	EIA-422; EIA-485
JESD-30 code	R-PDSO-G14
JESD-609 code	e3
length	8.65 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	14
Maximum operating temperature	70 °C
Minimum operating temperature
Minimum output swing	1.5 V
Maximum output low current	0.004 A
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP14,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	260
power supply	5 V
Certification status	Not Qualified
Maximum receive delay	22 ns
Number of receiver bits	1
Maximum seat height	1.75 mm
Maximum slew rate	12 mA
Maximum supply voltage	5.25 V
Minimum supply voltage	4.75 V
Nominal supply voltage	5 V
surface mount	YES
technology	CMOS
Temperature level	COMMERCIAL
Terminal surface	Matte Tin (Sn)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	30
maximum transmission delay	22 ns
width	3.9 mm
Base Number Matches	1

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LTC1686/LTC1687

52Mbps Precision Delay

RS485 Fail-Safe Transceivers

FEATURES

DESCRIPTION

The LTC

1686/LTC1687 are high speed, precision delay,

full-duplex RS485 transceivers that can operate at data

rates as high as 52Mbps. The devices also meet the

requirements of RS422.

A unique architecture provides very stable propagation

delays and low skew over a wide common mode and

ambient temperature range.

The driver and receiver feature three-state outputs, with

disabled driver outputs maintaining high impedance over

the entire common mode range. A short-circuit feature

detects shorted outputs and substantially reduces driver

output current. A similar feature also protects the receiver

output from short circuits. Thermal shutdown circuitry

protects from excessive power dissipation.

The receiver has a fail-safe feature that guarantees a high

output state when the inputs are shorted or are left floating.

The LTC1686/LTC1687 RS485 transceivers guarantee

receiver fail-safe operation over the

entire

common mode

range (– 7V to 12V). Receiver input resistance remains

≥

22k when the device is unpowered or disabled.

The LTC1686/LTC1687 operate from a single 5V supply

and draw only 7mA of supply current.

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

Precision Propagation Delay Over Temperature:

Receiver/Driver: 18.5ns

3.5ns

High Data Rate:

52Mbps

Low t

PLH

PHL

Skew:

Receiver/Driver: 500ps Typ

–7V to 12V RS485 Input Common Mode Range

Guaranteed Fail-Safe Operation Over the Entire

Common Mode Range

High Input Resistance:

≥

22k, Even When Unpowered

Short-Circuit Protected

Thermal Shutdown Protected

Driver Maintains High Impedance in Three-State or

with Power Off

Single 5V Supply

Pin Compatible with LTC490/LTC491

45dB CMRR at 26MHz

APPLICATIONS

High Speed RS485/RS422 Full Duplex Transceivers

Level Translator

Backplane Transceiver

STS-1/OC-1 Data Transceiver

Signal Repeaters

TYPICAL APPLICATION

LTC1686

DRIVER

100Ω

RECEIVER

LTC1686

2V/DIV

1V/DIV

RECEIVER

100Ω

DRIVER

5V/DIV

RECEIVER

OUTPUT

400 FT OF CATEGORY 5 UTP

100ns/DIV

1686/87 TA02

LTC1686/87 • TA01

10Mbps Data Pulse

400 Feet Category 5 UTP

DRIVER INPUT

CABLE DELAY

RECEIVER

INPUT

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