ISO1176T Datasheet, PDF (1/24 Pages) Texas Instruments – Isolated Profibus RS-485 Transceiver with Integrated Transformer Driver

ISO1176T
www.ti.com
SLLSE28C – OCTOBER 2010 – REVISED FEBRUARY 2011
Isolated Profibus RS-485 Transceiver with Integrated Transformer Driver
Check for Samples: ISO1176T
FEATURES
1
•2 4000V_peak Isolation, 560V_peak V_IORM
• Meets or Exceeds the Requirements of EN
50170 and TIA/EIA RS-485
• Signaling Rates up to 40 Mbps
• Differential Output exceeds 2.1V (54Ω Load)
• Low Bus Capacitance 10pF (MAX)
• 50kV/µs Typical Transient Immunity
• UL 1577, IEC 60747-5-2 (VDE 0884, Rev. 2)
Approvals Pending
• Fail-safe Receiver for Bus Open, Short, or Idle
APPLICATIONS
• Profibus^®
• Factory Automation
• Networked Sensors
• Motor/motion Control
• HVAC and Building Automation Networks
• Networked Security Stations
DESCRIPTION
The ISO1176T is an isolated differential line transceiver with integrated oscillator outputs that provide the primary
voltage for an isolation transformer. The device is ideal for long transmission lines because the ground loop is
broken to allow the device to operate with a much larger common-mode voltage range. The symmetrical isolation
barrier of each device is tested to provide 2500Vrms of isolation between the line transceiver and the logic-level
interface.
The galvanically isolated differential bus transceiver is an integrated circuit designed for bi-directional data
communication on multipoint bus-transmission lines. The transceiver combines a galvanically isolated differential
line driver and differential input line receiver. The driver has an active-high enable with isolated enable-state
output on the ISODE pin (pin 10) to facilitate direction control. The driver differential outputs and the receiver
differential inputs connect internally to form a differential input/output (I/O) bus port that is designed to offer
minimum loading to the bus whenever the driver is disabled or V_CC2 = 0.
Any cabled I/O can be subjected to electrical noise transients from various sources. These noise transients can
cause damage to the transceiver and/or near-by sensitive circuitry if they are of sufficient magnitude and
duration. The ISO1176T can significantly reduce the risk of data corruption and damage to expensive control
circuits.
The device is characterized for operation over the ambient temperature range of –40°C to 85°C.
DW PACKAGE
D1 ¹
D2 ²
GND1 ³
V_CC1 4
R⁵
RE ⁶
DE ⁷
D8
16 V_CC2
15 GND2
14 ^GND2
13 B
12 A
11 ^GND2
10 ISODE
9 GND2
1
D1
2 ^OSC
D2
5
R
6
RE
8
D
7
DE
13
B
12
A
10
ISODE
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Profibus is a registered trademark of Profibus International.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
© 2010–2011, Texas Instruments Incorporated