ST3243B(2011) 查看數據表（PDF） - STMicroelectronics
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ST3243B Datasheet PDF : 17 Pages
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ST3243B ST3243C
1
Description
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.
Doc ID 7539 Rev 10
3/17
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