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LTC1685

© LINEAR TECHNOLOGY CORPORATION 1997

1685f LT/TP 0897 4K • PRINTED IN THE USA

Linear Technology Corporation

PART NUMBER

DESCRIPTION

COMMENTS

LTC1485

High Speed RS485 Transceiver

10Mbps, Pin Compatible with LTC485

LTC1518

High Speed Quad RS485 Receiver

52Mbps, Pin Compatible with LTC488

LTC1519

High Speed Quad RS485 Receiver

52Mbps, Pin Compatible with LTC489

LTC1520

High Speed Quad Differential Receiver

52Mbps,

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

LTC1686/LTC1687

High Speed RS485 Driver/Receiver

52Mbps, Pin Compatible with LTC490/LTC491

RELATED PARTS

SO8 0695

0.016 – 0.050

0.406 – 1.270

0.010 – 0.020

(0.254 – 0.508)

× 45°

0

°– 8° TYP

0.008 – 0.010

(0.203 – 0.254)

0.053 – 0.069

(1.346 – 1.752)

0.014 – 0.019

(0.355 – 0.483)

0.004 – 0.010

(0.101 – 0.254)

0.050

(1.270)

BSC

1

2

3

4

0.150 – 0.157**

(3.810 – 3.988)

8

7

6

5

0.189 – 0.197*

(4.801 – 5.004)

0.228 – 0.244

(5.791 – 6.197)

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

*

**

Dimensions in inches (millimeters) unless otherwise noted.

S8 Package

8-Lead Plastic Small Outline (Narrow 0.150)

(LTC DWG # 05-08-1610)

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.