LTC1685C View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC1685C

52Mbps, Precision Delay, RS485 Fail-Safe Transceiver

Linear Technology 

Prev 11 12

LTC1685

APPLICATIONS INFORMATION

parasitic board capacitance. This maintains the good

matching characteristics of the low-to-high and high-to-

low transitions of the LTC1685. Note that output “A” to

output “B” capacitance should also be minimized. If routed

adjacent to each other on the same layer, they should be

separated by an amount at least as wide as the trace

widths. If output “A” and output “B” are routed on different

signal planes, they should not be routed directly on top of

each other. A trace width’s lateral separation is also

recommended.

As mentioned before, care should also be taken when

routing the “DI” input. To achieve consistent board-to-

board propagation delay, the ringing on this signal should

be kept below a few hundred millivolts.

PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.

S8 Package

8-Lead Plastic Small Outline (Narrow 0.150)

(LTC DWG # 05-08-1610)

0.189 – 0.197*

(4.801 – 5.004)

8

7

6

5

0.228 – 0.244

(5.791 – 6.197)

0.150 – 0.157**

(3.810 – 3.988)

0.010

(0.254

–

–

0.020

0.508)

×

45°

0.008 – 0.010

(0.203 – 0.254)

0°– 8° TYP

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 NOT INCLUDE INTERLEAD FLASH. INTERLEAD

FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE

1

2

34

0.053 – 0.069

(1.346 – 1.752)

0.004 – 0.010

(0.101 – 0.254)

0.014 – 0.019

(0.355 – 0.483)

0.050

(1.270)

BSC

SO8 0695

RELATED PARTS

PART NUMBER

LTC1485

LTC1518/LTC1519

LTC1520

LTC1686/LTC1687

LTC1688/LTC1689

DESCRIPTION

High Speed RS485 Transceiver

High Speed Quad RS485 Receivers

High Speed Quad Differential Receiver

High Speed RS485 Driver/Receiver

High Speed Quad RS485 Drivers

12 Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408)432-1900 q FAX:(408)434-0507 q www.linear-tech.com

COMMENTS

10Mbps, Pin Compatible with LTC485

52Mbps, Pin Compatible with LTC488/LTC489

52Mbps, ±100mV Threshold, Rail-to-Rail Common Mode

52Mbps, Pin Compatible with LTC490/LTC491

100Mbps, Pin Compatible with LTC486/LTC487

1685fa LT/LCG 0700 2K REV A • PRINTED IN THE USA

© LINEAR TECHNOLOGY CORPORATION 1997

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