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ST3243ECTR-E
?15 kV ESD protected 3 to 5.5 V, 400 kbps, RS-232 transceiver with auto power-down
October 2009 Doc ID 8648 Rev 12 1/16
ST3243EB
ST3243EC± 15 kV ESD protected 3 to 5.5 V , 400 kbps, RS-232
transceiver with auto power-down
Features ESD protection for RS-232 I/O pins: ± 8 kV IEC 1000-4-2 contact discharge ± 15 kV human body model 1 µA supply current achieved when in auto
power-down 250 kbps minimum guaranteed data rate Guaranteed 6 V/ms slew rate range Guaranteed mouse drive ability 0.1 µF external capacitors Meet EIA/TIA-232 specifications down to 3 V Available in TSSOP28 package
DescriptionThe 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 communication standards providing
high data rate capability and enhanced
electrostatic discharge (ESD) protection. All
transmitter outputs and receiver input are
protected to ± 8 kV USING IEC 1000-4-2 contact
discharge and ± 15 kV 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 3.0 V to 5.5 V supply with a
dual charge pump. The device is 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 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 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, subnotebook,
palmtop computers, battery-powered equipment,
handheld equipment, peripherals and printers.
Table 1. Device summary
Contents ST3243EB, ST3243EC2/16 Doc ID 8648 Rev 12
Contents Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Timing diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
ST3243EB, ST3243EC Pin configurationDoc ID 8648 Rev 12 3/16
1 Pin configuration
Figure 1. Pin configuration
Table 2. Pin description
Pin configuration ST3243EB, ST3243EC4/16 Doc ID 8648 Rev 12
Table 2. Pin description (continued)
ST3243EB, ST3243EC Truth tablesDoc ID 8648 Rev 12 5/16
2 Truth tables
Table 3. Invalid truth table
Table 4. Output control truth table
Maximum ratings ST3243EB, ST3243EC6/16 Doc ID 8648 Rev 12
3 Maximum ratings Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 5. Absolute maximum ratings
Table 6. ESD performance: transmitter outputs, receiver inputs
ST3243EB, ST3243EC Electrical characteristicsDoc ID 8648 Rev 12 7/16
4 Electrical characteristicsC1 - C4 = 0.1 µF , VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. ypical values are referred to TA = 25 °C.
C1 - C4 = 0.1 µF , VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. ypical values are referred to TA = 25 °C.
Table 7. Electrical characteristics
Table 8. Logic input electrical characteristics
Electrical characteristics ST3243EB, ST3243EC8/16 Doc ID 8648 Rev 12
C1 - C4 = 0.1 µF , VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. ypical values are referred to TA = 25 °C, FORCEON = GND, FORCEOFF = VCC.
C1 - C4 = 0.1 µF , VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. ypical values are referred to TA = 25 °C.
Table 9. Auto power-down electrical characteristics
Table 10. Transmitter electrical characteristics
