LTC1688CS Linear Technology, LTC1688CS Datasheet

IC DVR 100MBPS RS485 QUAD 16SOIC

LTC1688CS

Manufacturer Part Number
LTC1688CS
Description
IC DVR 100MBPS RS485 QUAD 16SOIC
Manufacturer
Linear Technology
Type
Driverr
Datasheet

Specifications of LTC1688CS

Number Of Drivers/receivers
4/0
Protocol
RS485
Voltage - Supply
3V, 5V
Mounting Type
Surface Mount
Package / Case
16-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LTC1688CS
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC1688CS#PBF
Manufacturer:
LTC
Quantity:
211
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Ultrahigh Speed: 100Mbps
Guaranteed Propagation Delay: 8ns 4ns
Over Temperature
Low Channel-to-Channel Skew: 500ps Typ
Hot Swap
50Mbps Operation with V
Low t
Driver Outputs Maintain High Impedance in
Three-State or with Power Off
Short-Circuit Protected: 3mA Typ Output Current
for an Indefinite Short
Thermal Shutdown Protected
Single 5V or 3V Supply
Pin Compatible with LTC486/LTC487
High Speed RS485 Twisted-Pair Drivers
High Speed Backplane Drivers
Complementary Clock Drivers
STS-1/OC-1 Data Drivers
SCSI Drivers
1/4 LTC1688
DRIVER
PLH
/t
TM
PHL
Capable
Skew: 500ps Typ
100
U
50Mbps RS485 Data Connection
100 FT CATEGORY 5 UTP
DD
= 3V
U
100
RECEIVER
1/4 LTC1518
DESCRIPTIO
The LTC
bus/line drivers that can operate at data rates up to
100Mbps. Propagation delay is guaranteed at 8ns 4ns
over the full operating temperature range. These devices
operate over the full RS485 common mode range (– 7V
to 12V), and also meet RS422 requirements.
The driver outputs are Hot Swap capable, maintaining
backplane data integrity during board insertion and
removal. The drivers feature three-state outputs, maintain-
ing high impedance over the entire common mode range
(– 7V to 12V). Outputs also remain high impedance during
power-up and with the power off. A short-circuit feature
detects bus contention and substantially reduces driver
output current. Thermal shutdown circuitry protects the
parts from excessive power dissipation.
The LTC1688 allows all four drivers to be enabled together,
while the LTC1689 allows two drivers at a time to be
enabled.
The LTC1688/LTC1689 operate from a single 5V or 3V
supply and draw only 9mA of supply current.
Hot Swap is a trademark of Linear Technology Corporation.
1688/89 TA01
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swapable Quad Drivers
®
1688/LTC1689 are ultrahigh speed, differential
2V/DIV
2V/DIV
2V/DIV
5V/DIV
U
20ns Pulse Across 100 Feet
LTC1688/LTC1689
100Mbps RS485
of Category 5 UTP
CABLE DELAY
RECEIVER OUTPUT
DRIVER OUTPUTS
RECEIVER INPUT
DRIVER INPUT
20ns/DIV
1688/89 TA02
16889fa
1

Related parts for LTC1688CS

LTC1688CS Summary of contents

Page 1

... The LTC1688 allows all four drivers to be enabled together, while the LTC1689 allows two drivers at a time to be enabled. The LTC1688/LTC1689 operate from a single supply and draw only 9mA of supply current. , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. 2V/DIV 2V/DIV 100 ...

Page 2

... OUT = LOW V = – 10V OUT OUT (RS422 (RS485), Figure Figure Figure ORDER PART TOP VIEW NUMBER DI4 LTC1688CS 3 14 DO4A LTC1689CS 4 13 DO4B LTC1688IS 5 12 ENB (EN34*) LTC1689IS 6 11 DO3B 7 10 DO3A 8 9 DI3 S PACKAGE 16-LEAD PLASTIC SO *LTC1689 ONLY ...

Page 3

DC ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER V Change in Magnitude of Driver Common OC Mode Output Voltage for Complementary Output States V Input High Voltage IH V Input Low Voltage IL I Input Current ...

Page 4

LTC1688/LTC1689 W U TYPICAL PERFORMANCE CHARACTERISTICS Propagation Delay vs Temperature DIFF C = 25pF ...

Page 5

PIN FUNCTIONS DI1 (Pin 1): Driver 1 Input. Do not float. DO1A (Pin 2): Driver 1 Noninverting Output. DO1B (Pin 3): Driver 1 Inverting Output. EN (Pin 4, LTC1688): High True Enable Pin, enables all four drivers. ...

Page 6

LTC1688/LTC1689 U W SWITCHI WAVEFOR PLH 1 10% – 1. ...

Page 7

U U APPLICATIONS INFORMATION Hot Swap Capability With the LTC1688/LTC1689 outputs disabled but con- nected to the transmission line, the user can turn on/off the power to the LTC1688/LTC1689 without inducing a differ- ential signal on the transmission line. Due ...

Page 8

LTC1688/LTC1689 U U APPLICATIONS INFORMATION Cable Termination The recommended cable termination for use with the LTC1688/LTC1689 is a single resistor across the two ends of a transmission cable (see Figure 8). When PC traces are used as the transmission line, ...

Page 9

... The propagation delay could then fall outside the specified window. The LT1720 dual UltraFast high data rate backplane applications. UltraFast is a trademark of Linear Technology Corporation. DRIVER 1/4 LTC1688 1688/89 F11 Figure 12. 100Mbps Differential Data Connection ...

Page 10

LTC1688/LTC1689 U U APPLICATIONS INFORMATION Layout Considerations A ground plane is recommended when using high fre- quency devices like the LTC1688/LTC1689. A 0.1 F ceramic bypass capacitor less than 0.25 inch away from the V pin is also recommended. Special ...

Page 11

... Figure 22. 100 Feet, 50Mbps, LTC1518 Receiver Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 12

... Comparator, Optimized for Operation www.linear.com .386 – .394 (9.804 – 10.008) NOTE .150 – .157 (3.810 – 3.988) NOTE 3 N .004 – .010 (0.101 – 0.254) .050 (1.270) BSC LT/TP 1003 1K REV A • PRINTED IN THE USA LINEAR TECHNOLOGY CORPORATION 1999 S16 0502 16889fa ...

Related keywords