ST3243EC Integrated Circuit Chip 15KV ESD PROTECTED. 3 TO 5.5V 400KBPS. RS-232 TRANSCEIVER

ST3243E

±15KV ESD PROTECTED 3 TO 5.5V, 400KBPS, RS-232 TRANSCEIVER WITH AUTO-POWERDOWN

■ ESD PROTECTION FOR RS-232 I/O PINS: ±8KV IEC 1000-4-2 CONTACT DISCHARGE ±15KV HUMAN BODY MODEL

■ 1µA SUPPLY CURRENT ACHIEVED WHEN IN AUTO-POWERDOWN

■ 250Kbps MINIMUM GUARANTEED DATA RATE

■ GUARANTEED 6V/µs SLEW RATE RANGE

■ GUARANTEED MOUSE DRIVEABILITY

■ 0.1µF EXTERNAL CAPACITORS

■ MEET EIA/TIA-232 SPECIFICATIONS DOWN TO 3V

■ AVAILABLE IN SO-28, SSOP-28, TSSOP28 AND FLIP-CHIP28 PACKAGES

DESCRIPTION

The ST3243E device consists of 3 drivers, 5 receivers and a dual charge-pump circuit. The device meets the requirements of EIA/TIA and V.28/V.24 comunication standards providing high data rate capability and enhanced electrostatic discharge (ESD) protection. All transmitter outputs and receiver input are protected to ±8KV USING IEC 1000-4-2 contact discharge and ±15KV using the Human Body Model. The receiver R2 is always active to implement a wake-up feature for serial port.

The ST3243E has a proprietary low-dropout transmitter output stage enabling true RS-232 performance from a 3.0V to 5.5V supply with a dual charge pump. The device is guaranteed to run at data rates of 250kbps while maintaining RS-232 output levels.

The Auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFF is set low, both drivers and receivers (expert R2B) are shut off, and supply current is reduced to 1µA. Disconnecting the serial port or turning off the peripheral drives causes the auto-powerdown condition to occur.

Auto-powerdown can be disabled when FORCEON and FORCEOFF are high, and should be done when driving a serial mouse. With Auto-powerdown enabled, the device is activated automatically when a valid signal is applied to any receiver input.

Typical application are in notebook, subnotebook, palmtop computers, battery-powered equipment, hand-held equipment, peripherals and printers.

ABSOLUTE MAXIMUM RATINGS

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.

APPLICATION CIRCUITS

Stock Offer (Hot Sell)