ISO35T_15 Datasheet, PDF (1/31 Pages) Texas Instruments – Isolated 3.3V RS-485 Transceiver With Integrated Transformer Driver

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ISO35T
SLLSE26D – NOVEMBER 2010 – REVISED OCTOBER 2015
ISO35T Isolated 3.3V RS-485 Transceiver With Integrated Transformer Driver
1 Features
•1 Designed for RS-485 and RS-422 Applications
• Signaling Rates up to 1 Mbps
• 1/8 Unit Load – up to 256 Nodes on a Bus
• Thermal Shutdown Protection
• Typical Efficiency > 60% (I_LOAD = 100 mA)
- See SLUU470
• Low-Driver Bus Capacitance 16 pF (Typical)
• Fail-Safe Receiver for Bus Open, Short, Idle
• Logic Inputs are 5-V Tolerant
• 50-kV/µs Typical Transient Immunity
• Bus-Pin ESD Protection
– 16-kV HBM Between Bus-Pins and GND2
– 6-kV HBM Between Bus-Pins and GND1
• Safety and Regulatory Approvals
– 4242 V_PK Basic Insulation per DIN V VDE V
0884-10 and DIN EN 61010-1
– 2500 V_RMS Isolation for 1 minute per UL 1577
– CSA Component Acceptance Notice 5A, IEC
60950-1 and IEC 61010-1 Standards
2 Applications
• Isolated RS-485/RS-422 Interfaces
• Factory Automation
• Motor/Motion Control
• HVAC and Building Automation Networks
• Networked Security Stations
3 Description
The ISO35T is an isolated differential line transceiver
with integrated oscillator outputs that provide the
primary voltage for an isolation transformer. The
device is a full-duplex differential line transceiver for
RS-485 and RS-422 applications that can easily be
configured for half-duplex operation by connecting pin
11 to pin 14, and pin 12 to pin 13.
These devices are ideal for long transmission lines
since the ground loop is broken to allow for a much
larger common-mode voltage range. The symmetrical
isolation barrier of the device is tested to provide
4242V_PK of isolation per VDE for 60s between the
bus-line transceiver and the logic-level interface.
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 ISO35T can
significantly reduce the risk of data corruption and
damage to expensive control circuits.
The ISO35T is specified for use from –40°C to 85°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ISO35T
SOIC (16)
10.30 mm × 7.50 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Control
Circuitry
Typical Application Circuit
X-FMR
4
8
D1
3
2
C1
1
7
6
5
D2
C4 C5
1 _D1
2
D2
16
V_CC2
C3
4 _VCC1
C2
3
GND1
14
A
13
B
5
12
R
Z
6
RE
11
Y
7
15
DE
8D
9, 10
GND2
ISO35T
LDO
1 _IN
5
OUT
3 _EN
C6
2 _{GND NC} 1
Isolated Supply to
other Components
RS-485 Bus
Interface
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.