UM232EESE

The UM232EExE series are low power single supply RS232 interface. The device consists of two line drivers, two line receivers, and dual charge pump circuit. The device meets the requirements of TIA/EIA - 232 standard and provides the electrical interface between an asynchronous communication controller and the serial - port connector. The on chip charge pump and four small external capacitors act as onboard DC to DC converter, allow chip operated from single 5V supply, eliminating the need for ±10V power supplies, reduce cost and board space. The device operates at data signaling rates over 250kbps. The slew rate of driver is set internally less than 30V/μs and the receivers feature internal noise filtering, eliminating the need for external slew rate and filter capacitors for reliable operation. The driver inputs and receiver outputs are TTL and CMOS compatible. UM232EExE comes in 16 pin DIP, SOP and TSSOP packages, operating over the commercial and industrial temperature ranges. The ESD tolerance has been upgraded on these devices to over ±15kV for both Human Body Model and IEC61000 - 4 - 2 Air Discharge Method, without latch - up. The device operates with four 0.1μF capacitors, reduce system cost and board space. The UM232EExE consists of three sections: charge - pump voltage converters, drivers, and receivers. These E versions provide extra protection against ESD. They survive ±15kV discharges to the RS - 232 inputs and outputs, tested using the Human Body Model. When tested according to IEC61000 - 4 - 2, they survive ±8kV contact - discharges and ±15kV air - gap discharges. The rugged E versions are intended for use in harsh environments or applications where the RS - 232 connection is frequently changed. The UM232EExE devices have internal charge pump voltage converters which allow them to operate from a single +5V supply. The charge pumps will operate with polarized or non - polarized capacitors ranging from 0.1 to 10μF and will generate the ±9V needed to generate the RS - 232 output levels.

Applications

• Notebook and Palmtop Computers
• Battery - Powered Equipments
• Hand - Held Equipments
• POS Terminals

Key features

• ESD Protection for RS - 232 Bus Pins up to ±15kV Human Body Model
• Single +5V Power Supply
• Low Power, ICC 15mA Maximum
• Operates up to 250kbps
• Receiver Noise Filter Latch - Up Performance Exceeds 200mA