ISO1176 Datasheet, PDF (1/25 Pages) Texas Instruments – ISOLATED RS-485 PROFIBUS TRANSCEIVER

ISO1176
www.ti.com.................................................................................................................................................. SLLS897C – MARCH 2008 – REVISED OCTOBER 2008
ISOLATED RS-485 PROFIBUS TRANSCEIVER
FEATURES
1
• 4000-V_PEAK Isolation
• Bus-Pin ESD Protection
– 16 kV HBM Between Bus Pins and GND2
– 6 kV HBM Between Bus Pins and GND1
• Meets or Exceeds the Requirements of
EN 50170 and TIA/EIA-485
• Signaling Rates up to 40 Mbps
• Differential Output Exceeds 2.1 V (54 Ω Load)
• Low Bus Capacitance – 10 pF (MAX)
• 50 kV/µs Typical Transient Immunity
• Failsafe Receiver for Bus Open, Short, Idle
• 3.3-V Inputs are 5-V Tolerant
APPLICATIONS
• Profibus
• Factory Automation
• Networked Sensors
• Motor/Motion Control
• HVA and Building Automation Networks
• Networked Security Stations
DESCRIPTION
The ISO1176 is an isolated differential line transceiver designed for use in PROFIBUS applications. The device
is ideal for long transmission lines since the ground loop is broken to provide for operation with a much larger
common mode voltage range. The symmetrical isolation barrier of each device is tested to provide 2500 Vrms 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 allowing up to 160 nodes.
The PV pin (pin 7) is provided as a full-chip enable option. All device outputs become high impedance when a
logic low is applied to the PV pin. For more information, see the function tables in the device information section.
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 ISO1176 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.
V_CC1
GND 1
R
RE
DE
D
PV
GND 1
DW PACKAGE
(TOP VIEW)
1
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
V_CC2
GND 2
NC
B
A
NC
ISODE
GND 2
ISO1176
function diagram
R3
RE ⁴
6
D
7
PV
DE ⁵
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.
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.
Copyright © 2008, Texas Instruments Incorporated