|Information||Intelligent +3.0V to +5.5V RS-232 Transceiver|
|Supply Voltage (Nom) (V)||3.3, 5|
|No. of Tx||1|
|No. of Rx||1|
|Data Rate (kbps)||250|
|HBM ESD (kV)||15|
|IEC 61000-4-2 Contact (±kV)||8|
|Int. Charge Pump||✔|
|No. of Ext Caps||4|
|Nom Cap Value (µF)||0.1|
|Temperature Range (°C)||-40 to 85|
The SP3221E is a 1-driver/1-receiver RS-232 transceiver intended for portable or battery-powered applications such as embedded computers, data logging devices, medical diagnostics, and remote sensors. This device uses an internal high-efficiency, charge-pump power supply that requires only four 0.1µA capacitors. This charge pump and MaxLinear's driver architecture allow the SP3221E to deliver compliant RS-232 performance from a single power supply ranging from +3.0V to +5.5V. The SP3221E is offered in a 16 pin TSSOP package.
The AUTO ON-LINE® feature allows the device to automatically "wake-up" during a shutdown state when an RS-232 cable is connected and a connected peripheral is turned on. Otherwise, the device automatically shuts itself down drawing less than 1µA.
- Meets true EIA/TIA-232-F Standards from a +3.0V to +5.5V power supply
- Interoperable with EIA/TIA-232 and adheres to EIA/TIA-562 down to a +2.7V power source
- AUTO ON-LINE® circuitry automatically wakes up from a 1μA typical shutdown
- Minimum 250kbps data rate under load
- Regulated charge pump yields stable RS-232 outputs regardless of VCC variations
- Enhanced ESD Specifications:
- +15KV Human Body Model
- +15KV IEC1000-4-2 Air Discharge
- +8KV IEC1000-4-2 Contact Discharge
- Low Power Serial Communications
- Portable Serial Devices
- Point of Sale Equipment
- Embedded PCs
Documentation & Design Tools
|Data Sheets||SP3221E Intelligent +3.0V to +5.5V RS-232 Transceiver||2.0.3 (258DSR01)||October 2023||768.9 KB|
|Application Notes||RS-232 and RS-485 PCB Layout Application Note||R00||December 2022||2.8 MB|
|Product Brochures||Interface Brochure||November 2023||3.7 MB|
Quality & RoHS
|Part Number||RoHS | Exempt||RoHS||Halogen Free||REACH||TSCA||MSL Rating / Peak Reflow||Package|
|SP3221EEY-L/TR||N||Y||Y||Y||Y||L1 / 260ᵒC||TSSOP16|
|SP3221EEA-L/TR||N||Y||Y||Y||Y||L2 / 260ᵒC||SSOP16|
Click on the links above to download the Certificate of Non-Use of Hazardous Substances.
Parts & Purchasing
|Part Number||Pkg Code||Min Temp||Max Temp||Status||Suggested Replacement||Buy Now||Order Samples||PDN|
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
FAQs & Support
Search our list of FAQs for answers to common technical questions.
For material content, environmental, quality and reliability questions review the Quality tab or visit our Quality page.
For ordering information and general customer service visit our Contact Us page.
Submit a Technical Support Question As a New Question
For RS-232 it is 50 feet (15 meters), or the cable length equal to a capacitance of 2500 pF, at a maximum transmission rate of 19.2kbps. When we reduce the baud rate, it allows for longer cable length. For Example:
Baud Rate (bps)
Maximum RS-232 Cable Length (ft)
The Parts & Purchasing section of the product page shows the Status of all orderable part numbers for that product. Click Show obsolete parts, to see all EOL or OBS products.