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ST3243CPR

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15kV ESD protected 3 to 5.5V, 400kbps, RS-232 transceiver with auto power-down

Quantity $ per Unit Savings
1 - 9$3.790%
10 - 24$3.4110%
25 - 99$3.2215%
100 - 249$2.7926%
250 - 499$2.6630%
500$2.3837%
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$3.79
Parameter NameParameter Value
Supply Voltage Min Volt3.0
Supply Voltage Max Volt5.5
Operating Temp Min Celsius0.0
Operating Temp Max Celsius70.0
ECCN USEAR99
ECCN EUNEC
Packing TypeTape And Reel
ROHS Compliance GradeEcopack3
GradeIndustrial
Package NameSSOP 28 10.2x5.3

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 and enhanced electrostatic discharge (ESD) protection.


All transmitter outputs and receiver inputs are protected to ±8 kV using IEC61000-4-2 contact discharge and ±15 kV IEC61000-4-2 air discharge.


The receiver R2 is always active to implement a wake-up feature for the serial port.


The ST3243B/ST3243C devices 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 FORCEOFFis high. During this mode of operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFFis set low, both drivers and receivers (expert R2B) are shut off, and supply current is reduced to 1 μA. 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 FORCEOFFare 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, subnotebook, palmtop computers, battery-powered equipment, hand-held equipment, peripherals, and printers.

Key features
  • ESD protection for RS-232 I/O pins
    • ±8 kV IEC61000-4-2 contact discharge
    • ±15 kV IEC61000-4-2 air discharge
  • 1 μA supply current achieved when in auto-power-down
  • 250 kbps minimum guaranteed data rate
  • Guaranteed 6 V/μs slew rate range
  • Guaranteed mouse drive ability
  • 0.1 μF external capacitors
  • Meet EIA/TIA-232 specifications down to 3 V
  • Available in SSOP-28 package