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SP335E Datasheet PDF - EXAR

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

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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

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SP335E equivalent
SP335E
REV. 1.0.0
RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION
ELECTRICAL CHARACTERISTICS (Continued)
UNLESS OTHERWISE NOTED:
VCC = +3.0V to +5.5V, C1-C4 = 0.1µF; TA = TMIN to TMAX. Typical values are at VCC = 3.3V, TA = +25°C.
SYMBOL
PARAMETERS
MIN. TYP. MAX. UNITS
CONDITIONS
RS-485/422 DIFFERENTIAL RECEIVER INPUTS (A,B)
RIN Receiver Input Resistance
96
IIN
VTH
VTH
RTERM
Receiver Input Current
Receiver Differential
Threshold Voltage
Receiver Input Hysteresis
Termination Resistance
RTERM Termination Resistance
-200
100
100
-125
25
120
120
125
-100
-50
155
140
Termination disabled,
k -7V VCM +12V
µA VIN = +12V
µA VIN = -7V
mV -7V VCM +12V
mV
Termination enabled, Figure 4
-7V VCM +12V
Termination enabled, Figure 4
VCM = 0V
RS-485/422 DIFFERENTIAL DRIVER OUTPUTS (Y, Z)
1.5
VOD Differential Driver Output
1.5
2
Change In Magnitude of
VOD Differential Output Voltage
VCM
VCM
Driver Common Mode Output Voltage
Change In Magnitude of
Common Mode Output Voltage
IOSD
Driver Output Short Circuit Current
IO Driver Output Leakage Current
VCC
VCC
VCC
0.2
3
0.2
±250
±125
V RL = 54 (RS-485), Figure 5
V -7V VCM +12V, Figure 6
V RL = 100 (RS-422), Figure 5
V RL = 54 or 100 , Figure 5
V RL = 54 or 100 , Figure 5
V RL = 54 or 100 , Figure 5
mA -7V VY or VZ +12V, Figure 7
DE = 0V or SHDN = 0V,
µA VY or VZ = -7V or +12V,
VCC = 0V or 5.5V
5


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