SP335E_17 Datasheet, PDF (1/23 Pages) Exar Corporation – TRANSCEIVER WITH INTERNAL TERMINATION

SP335E
RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
August 2017
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.
ORDERING INFORMATION⁽¹⁾
Rev. 1.0.2
FEATURES
 Pin-Selectable Cable Termination
 No External Resistors Required for RS-485/422
Termination or Biasing
 Robust ESD Protection:
■ ±15kV IEC 61000-4-2 Air Gap Discharge
■ ± 8kV IEC 61000-4-2 Contact Discharge
■ ±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 V_L pin
 2 Drivers, 2 Receivers RS-232/V.28
 1 Driver, 1 Receiver RS-485/422
■ Full or Half Duplex Configuration
■ 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
PART NUMBER
OPERATING TEMPERATURE RANGE
LEAD-FREE
SP335EER1-L
SP335EER1-L/TR
SP335ECR1-L
SP335ECR1-L/TR
-40°C to +85°C
0°C to +70°C
Yes⁽²⁾
SP335EER1-0A-EB
SP335E Evaluation Board
NOTES:
1.
2.
Refer to www.exar.com/SP335E for most up-to-date Ordering Information
Visit www.exar.com for additional information on Environmental Rating
PACKAGE
32-pin QFN
PACKAGE METHOD
Tray
Reel
Tray
Reel
1