LTC1687_15 Datasheet, PDF (12/12 Pages) Linear Technology – 52Mbps Precision Delay RS485 Fail-Safe Transceivers

LTC1686/LTC1687
APPLICATIONS INFORMATION
Long traces bounded by a V_DD and/or GND planes can add
substantial parasitic capacitance. Parasitic capacitances
on the receiver/driver outputs can also unduly slow down
both the propagation delay and the rise/fall times.
The receiver inputs are high bandwidth and high imped-
ance. If they are left floating, any capacitive coupling from
any other signal can cause a glitch at the receiver output.
Thus, if the receiver is not being used, it is advisable to
always ground at least one of the two receiver input pins.
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
0°– 8° TYP
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
*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
0.004 – 0.010
(0.101 – 0.254)
0.189 – 0.197*
(4.801 – 5.004)
8
7
6
5
0.050
(1.270)
TYP
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
SO8 0996
1
2
34
S Package
14-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
0° – 8° TYP
0.004 – 0.010
(0.101 – 0.254)
0.337 – 0.344*
(8.560 – 8.738)
14 13 12 11 10
9
0.228 – 0.244
0.016 – 0.050
0.406 – 1.270
0.014 – 0.019
(0.355 – 0.483)
0.050
(1.270)
TYP
(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
1
2
3
4
5
6
8
0.150 – 0.157**
(3.810 – 3.988)
S14 0695
7
RELATED PARTS
PART NUMBER
LTC490
LTC491
LTC1518
LTC1519
LTC1520
LTC1685
DESCRIPTION
Low Power RS485 Full-Duplex Transceiver
Low Power RS485 Full-Duplex Transceiver
High Speed Quad RS485 Receiver
High Speed Quad RS485 Receiver
High Speed Quad Differential Receiver
High Speed RS485 Transceiver
12 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417^q [phone]
FAX: [phone]^q TELEX: 499-3977 ^q www.linear-tech.com
COMMENTS
I_CC = 300µA (Typ), SO-8 Package
I_CC = 300µA (Typ), 14-Lead SO Package
52Mbps, Pin Compatible with LTC488
52Mbps, Pin Compatible with LTC489
52Mbps, ±100mV Threshold, Rail-to-Rail Common Mode
52Mbps, Pin Compatible with LTC485
16867fs, sn16867 LT/TP 1197 4K • PRINTED IN THE USA
© LINEAR TECHNOLOGY CORPORATION 1997