STMicroelectronics recently announced two RS232 interface chips that feature rugged ESD protection, 3 to 5,5 V supply voltage, 250 Kbps minimum data rate, and low-power operation. The two devices, the ST3243E RS232 transceiver and the ST3232E multiple RS232 driver/receiver chips, will find suitable application in a wide range of portable and desktop computer equipment including notebook, sub-notebook, and palm-top computers; a variety of battery-powered and handheld equipment; and printers and other computer peripherals.
Of the two RS232 interface chips, the ST3243E includes three drivers and five receivers, while the ST3232E has two drivers and two receivers. To ensure reliable operation, each RS232 I/O pin of both devices is protected to ±15 kV using the Human Body Model and ±8 kV using the IEC 1000-4-2 contact discharge method. Both chips also include a dual charge-pump circuit.
By integrating dual charge pumps and low-dropout transmitters, both devices fully meet EIA/TIA-232 specifications while operating from a 3 to 5,5 V supply voltage, eliminating the need for the ±12 V source typically required for other RS232 interface devices. The charge pumps require only four 0,1 µF capacitors. Other key specifications shared by both the ST3243E and ST3232E include a minimum 250 Kbps data rate at RS232 levels, 6 V/µs slew rate, and as much as a -40°C to +85°C operating temperature range.
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