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ST3243B Fiches technique(PDF) 3 Page - STMicroelectronics |
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ST3243B Fiches technique(HTML) 3 Page - STMicroelectronics |
3 / 17 page ST3243B ST3243C Description Doc ID 7539 Rev 10 3/17 1 Description The ST3243B / ST3243C devices consist of 3 drivers, 5 receivers and a dual charge-pump circuit. The devices meet the requirements of EIA/TIA and V.28/V.24 communication standards providing high data rate capability. The receiver R2 is always active to implement a wake-up feature for serial port. The ST3243B / ST3243C have a proprietary low-dropout transmitter output stage enabling true RS-232 performance from a 3.0 V to 5.5 V supply with a dual charge pump. The devices are guaranteed to run at data rates of 250 kbps while maintaining RS-232 output levels. The auto-power-down 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 1 mA. Disconnecting the serial port or turning off the peripheral drives causes the auto-power-down condition to occur. Auto-power-down can be disabled when FORCEON and FORCEOFF are high, and should be done when driving a serial mouse. With auto-power-down enabled, the device is activated automatically when a valid signal is applied to any receiver input. Typical application are in notebook, sub-notebook, palmtop computers, battery-powered equipment, hand-held equipment, peripherals and printers. |
Numéro de pièce similaire - ST3243B_11 |
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Description similaire - ST3243B_11 |
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