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SP335E Datasheet Preview

SP335E Datasheet

RS-232/RS-485/RS-422 TRANSCEIVER

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SP335E
RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
Sept 2013
Rev. 1.0.0
GENERAL DESCRIPTION
The SP335 is an advanced multiprotocol transceiver
supporting RS-232, RS-485, and RS-422 serial
standards. Integrated cable termination and multiple
configuration modes allow all three protocols to be
used interchangeably over a single cable or
connector with no additional switching components.
Full operation requires only four external charge
pump capacitors.
The RS-485/RS-232 mode pin selects RS-485 mode
when high, and RS-232 mode when low. In RS-485
mode, the TERM pin enables the differential 120
termination, and the HALF/FULL pin configures the
transceiver as either half or full duplex.
The high speed drivers operate up to 20Mbps in RS-
485/422 modes, and up to 1Mbps in RS-232 mode.
All drivers can be slew limited to 250kbps in any
mode to minimize electromagnetic interference (EMI)
by setting the dedicated SLEW pin low.
All transmitter outputs and receiver inputs feature
robust electrostatic discharge (ESD) protection to
±15kV IEC 61000-4-2 Airgap, ±15kV Human Body
Model (HBM) and ±8kV IEC 61000-4-2 Contact. Each
receiver output has full fail-safe protection to avoid
system lockup, oscillation, or indeterminate states by
defaulting to logic-high output level when the inputs
are open, shorted, or terminated but undriven. No
external biasing resistors are required.
The RS-232 receiver inputs include a 5k pull-down
to ground when in RS-232 mode. The RS-485/422
receiver inputs are high impedance (>96k when
termination is disabled), allowing up to 256 devices
on a single communication bus (1/8th unit load).
The SP335 operates from a single power supply,
either 3.3V or 5V, with low idle current. The shutdown
mode consumes less than 1µA in low power standby
operation with RS-232 receivers enabled.
FEATURES
Pin-Selectable Cable Termination
No External Resistors Required for RS-485/422
Termination or Biasing
Robust ESD Protection:
I ±15kV IEC 61000-4-2 Air Gap Discharge
I ± 8kV IEC 61000-4-2 Contact Discharge
I ±15kV Human Body Model (HBM)
20Mbps RS-485 and 1Mbps RS-232 Data Rates
Pin-Selectable 250kbps Slew Limiting
Single Supply Operation from +3V to +5.5V
1.65V to 5.5V Logic Interface VL pin
2 Drivers, 2 Receivers RS-232/V.28
1 Driver, 1 Receiver RS-485/422
I Full or Half Duplex Configuration
I 1/8th Unit Load, up to 256 receivers on bus
RS-485/422 Enhanced Receiver Fail-safe for open,
shorted, or terminated but idle inputs
10nA Shutdown Supply Current (typical)
Small 32 QFN package (5mm x 5mm)
TYPICAL APPLICATIONS
Software Programmable Serial Ports
(RS-232, RS-422, RS-485)
Industrial and Single Board Computers
Industrial and Process Control Equipment
Point-Of-Sale Equipment
HVAC Controls and Networking Equipment
Building Security and Automation
ORDERING INFORMATION
PART NUMBER
SP335EER1-L
SP335ECR1-L
PACKAGE
32-pin QFN
32-pin QFN
OPERATING TEMPERATURE RANGE
-40°C to +85°C
0°C to +70°C
NOTE: Tape and Reel part numbers are SP335ExR1-L/TR, -L = Green / RoHS Compliant
DEVICE STATUS
In Production
In Production
Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com




EXAR

SP335E Datasheet Preview

SP335E Datasheet

RS-232/RS-485/RS-422 TRANSCEIVER

No Preview Available !

SP335E
RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
ABSOLUTE MAXIMUM RATINGS
REV. 1.0.0
These are stress ratings only and functional operation of the device at these ratings or any other above those
indicated in the operation sections to the specifications below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect reliability and cause permanent damage to the device.
Supply Voltage VCC
Logic Interface Voltage VL
Voltage at TTL Input Pins
Receiver Input Voltage (from Ground)
Driver Output Voltage (from Ground)
Short Circuit Duration, TX out to Ground
Storage Temperature Range
Lead Temperature (soldering, 10s)
Power Dissipation 32-pin 5x5 QFN
(derate 26.0mW/°C above +70°C)
-0.3V to +6.0V
VL VCC
-0.3V to +6.0V
±18V
±18V
Continuous
-65°C to +150°C
+300°C
1400mW
CAUTION:
ESD (ElectroStatic Discharge) sensitive device. Permanent damage may occur on unconnected devices
subject to high energy electrostatic fields. Unused devices must be stored in conductive foam or shunts.
Personnel should be properly grounded prior to handling this device. The protective foam should be
discharged to the destination socket before devices are removed.
ESD PROTECTION
TX Output & RX Input Pins
All Other Pins
MIN. TYP. MAX. UNITS
±15 kV IEC 61000-4-2 Airgap
± 8 kV IEC 61000-4-2 Contact
±15 kV Human Body Model (HBM)
± 3 kV Human Body Model (HBM)
2


Part Number SP335E
Description RS-232/RS-485/RS-422 TRANSCEIVER
Maker EXAR
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