LTC1685 Linear Technology, LTC1685 Datasheet - Page 12

• Manufacturer Part Number: LTC1685
• Description: 52Mbps/ Precision Delay/ RS485 Fail-Safe Transceiver
• Manufacturer: Linear Technology

PACKAGE
RELATED PARTS
APPLICATIONS
LTC1685
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
PART NUMBER
LTC1485
LTC1518
LTC1519
LTC1520
LTC1686/LTC1687
12
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 [phone]
FAX: [phone] TELEX: 499-3977 www.linear-tech.com
(0.203 – 0.254)
**
0.008 – 0.010
*
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
DESCRIPTION
DESCRIPTION
High Speed RS485 Transceiver
High Speed Quad RS485 Receiver
High Speed Quad RS485 Receiver
High Speed Quad Differential Receiver
High Speed RS485 Driver/Receiver
U
(0.254 – 0.508)
0.010 – 0.020
INFORMATION
U
0.016 – 0.050
0.406 – 1.270
45
W
U
8-Lead Plastic Small Outline (Narrow 0.150)
Dimensions in inches (millimeters) unless otherwise noted.
0 – 8 TYP
U
(LTC DWG # 05-08-1610)
S8 Package
(5.791 – 6.197)
0.228 – 0.244
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.
(1.346 – 1.752)
0.053 – 0.069
COMMENTS
10Mbps, Pin Compatible with LTC485
52Mbps, Pin Compatible with LTC488
52Mbps, Pin Compatible with LTC489
52Mbps, 100mV Threshold, Rail-to-Rail Common Mode
52Mbps, Pin Compatible with LTC490/LTC491
(0.355 – 0.483)
0.014 – 0.019
8
1
(4.801 – 5.004)
0.189 – 0.197*
2
7
6
3
5
4
1685f LT/TP 0897 4K • PRINTED IN THE USA
LINEAR TECHNOLOGY CORPORATION 1997
(1.270)
0.050
BSC
(3.810 – 3.988)
0.150 – 0.157**
(0.101 – 0.254)
0.004 – 0.010
SO8 0695