IC TXRX RS485/422 5V HS 8-MSOP

ISL81485IU

Manufacturer Part NumberISL81485IU
DescriptionIC TXRX RS485/422 5V HS 8-MSOP
ManufacturerIntersil
TypeTransceiver
ISL81485IU datasheet
 


Specifications of ISL81485IU

Number Of Drivers/receivers1/1ProtocolRS422, RS485
Voltage - Supply4.5 V ~ 5.5 VMounting TypeSurface Mount
Package / Case8-MSOP, Micro8™, 8-uMAX, 8-uSOP,Lead Free Status / RoHS StatusContains lead / RoHS non-compliant
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Data Sheet
5V, 30Mbps, RS-485/RS-422 Transceiver
The Intersil ISL81485 is a BiCMOS, 5V powered, single
transceiver that meets both the RS-485 and RS-422
standards for balanced communication, and features a larger
output voltage and higher data rate to benefit high speed
applications.
Unlike competitive devices, this Intersil transceiver is
specified for 10% tolerance supplies (4.5V to 5.5V), and it
delivers a much larger worst case differential output voltage
(2.0V compared to the typical 1.5V) over the full supply
range. The increased output voltage translates into longer
reach, or better data integrity, at the 30Mbps data rate.
This device presents a “1 unit load” to the RS-485 bus, which
allows up to 32 transceivers on the network.
Receiver (Rx) inputs feature a “fail-safe if open” design,
which ensures a logic high Rx output if Rx inputs are
floating.
Driver (Tx) outputs are short circuit protected, even for
voltages exceeding the power supply voltage. Additionally,
on-chip thermal shutdown circuitry disables the Tx outputs to
prevent damage if power dissipation becomes excessive.
Ordering Information
PART NO.
TEMP.
o
(BRAND)
RANGE (
C)
PACKAGE
ISL81485IB
-40 to 85
8 Ld SOIC
(81485IB)
ISL81485IBZ
-40 to 85
8 Ld SOIC
(81485IB) (See Note)
(Pb-free)
ISL81485IU (1485)
-40 to 85
8 Ld MSOP
ISL81485IUZ (1485)
-40 to 85
8 Ld MSOP
(See Note)
(Pb-free)
*Add “-T” suffix to part number for tape and reel packaging.
NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which is compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J Std-020B.
1
July 2004
Features
• Specified for 10% Tolerance Supplies
• High Data Rates. . . . . . . . . . . . . . . . . . . . . up to 30Mbps
• Large Differential Output Voltage . . . . 2.0V(min.) into 54Ω
• Drop-In Replacement for the ADM1485
• One Unit Load Allows up to 32 Devices on the Bus
• Low Quiescent Current . . . . . . . . . . . . . . . . . . . . . 800
• -7V to +12V Common Mode Input Voltage Range
• Three State Rx and Tx Outputs
• 15ns (Max) Propagation Delays, 5ns (Max) Skew
• Operates from a Single +5V Supply (10% Tolerance)
• Current Limiting and Thermal Shutdown for driver
Overload Protection
• Pb-free available
Applications
• SCSI “Fast 20” Drivers and Receivers
• Factory Automation
• Field Bus Networks
• Security Networks
PKG.
DWG. #
• Building Environmental Control Systems
M8.15
• Industrial/Process Control Networks
M8.15
Pinout
ISL81485 (SOIC, MSOP)
M8.118
M8.118
RO
RE
DE
DI
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
|
1-888-INTERSIL or 321-724-7143
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003, 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ISL81485
FN6061.1
µ
A
TOP VIEW
1
8
V
CC
R
2
7
B / Z
3
6
A / Y
D
4
5
GND

ISL81485IU Summary of contents

  • Page 1

    ... Ld SOIC (81485IB) (See Note) (Pb-free) ISL81485IU (1485) - MSOP ISL81485IUZ (1485) - MSOP (See Note) (Pb-free) *Add “-T” suffix to part number for tape and reel packaging. NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is compatible with both SnPb and Pb-free soldering operations ...

  • Page 2

    Truth Table TRANSMITTING INPUTS Pin Descriptions PIN RO Receiver output > least 0.2V high < 0.2V or ...

  • Page 3

    Absolute Maximum Ratings V to Ground ...

  • Page 4

    Electrical Specifications Test Conditions: V Note 2 (Continued) PARAMETER SYMBOL Receiver Short-Circuit Current I OSR SWITCHING CHARACTERISTICS Driver Input to Output Prop Delay t PLH Driver Prop Delay Skew t SKEW Driver Differential Rise or Fall Time t R Driver ...

  • Page 5

    Test Circuits and Waveforms SIGNAL GENERATOR FIGURE 2A. TEST CIRCUIT FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES SIGNAL Y GENERATOR C L PARAMETER OUTPUT RE t ...

  • Page 6

    Test Circuits and Waveforms RE B +1. SIGNAL GENERATOR FIGURE 5A. TEST CIRCUIT SIGNAL A GENERATOR PARAMETER FIGURE 6A. TEST ...

  • Page 7

    Driver Features The RS-485, RS-422 driver is a differential output device that delivers at least 2V across a 54Ω load (RS-485), and at least 2.5V across a 100Ω load (RS-422) even with V The drivers feature low propagation delay skew ...

  • Page 8

    Typical Performance Curves 120 100 DIFFERENTIAL OUTPUT VOLTAGE (V) FIGURE 9. DRIVER OUTPUT CURRENT vs DIFFERENTIAL OUTPUT VOLTAGE 54Ω DIFF PHLY t PHLZ 8 7 ...

  • Page 9

    Typical Performance Curves Die Characteristics SUBSTRATE POTENTIAL (POWERED UP): GND TRANSISTOR COUNT: 528 PROCESS: Si Gate BiCMOS 9 ISL81485 5V Unless Otherwise Specified (Continued 950 ...

  • Page 10

    Mini Small Outline Plastic Packages (MSOP -B- INDEX 1 2 0.20 (0.008) AREA TOP VIEW 0.25 (0.010) GAUGE PLANE SEATING PLANE - 0.10 (0.004) b -H- - 0.20 (0.008) SIDE VIEW 0.20 ...

  • Page 11

    ... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...