RS-232/RS-485/RS-422 TRANSCEIVER WITH 1.65V-5.5V INTERFACE
The SP330 is an advanced multiprotocol transceiver
supporting RS-232, RS-485, and RS-422 serial
standards and featuring a variable low voltage logic
interface, down to 1.65V. 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 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), allowing
up to 256 devices on a single communication bus
(1/8th unit load).
The SP330 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.
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 VL 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 24 TSSOP package
Software Programmable Serial Ports
(RS-232, RS-422, RS-485)
Industrial and Single Board Computers
Industrial and Process Control Equipment
HVAC Controls and Networking Equipment
Building Security and Automation
OPERATING TEMPERATURE RANGE
-40°C to +85°C
SP330E Evaluation Board
Tape and Reel
1. Refer to www.exar.com/SP330E for most up-to-date Ordering Information.
2. Visit www.exar.com for additional information on Environmental Rating.