ST3243_06 Datasheet, PDF (1/20 Pages) STMicroelectronics – 3 to 5.5V, 400Kbps, RS-232 Transceiver with auto-powerdown

ST3243
3 to 5.5V, 400Kbps, RS-232 Transceiver
with auto-powerdown
General features
s 1µA supply current achieved when in auto-
powerdown
s 250kbps minimum guaranteed data rate
s Guaranteed 6V/µs slew rate range
s Guaranteed mouse drive ability
s 0.1µF external capacitors
s Meet EIA/TIA-232 specifications down to 3V
s Available in SO-28, SSOP-28 and TSSOP28
Description
The ST3243 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.
The receiver R2 is always active to implement a
wake-up feature for serial port.
The ST3243 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
SOP
SSOP
TSSOP
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 1mA.
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.
Order code
Part number Temperature range
ST3243CDR
ST3243CPR
ST3243CTR
ST3243BTR
0 to 70 °C
0 to 70 °C
0 to 70 °C
-40 to 85 °C
Package
SO-28 (Tape & Reel)
SSOP-28 (Tape & Reel)
TSSOP28 (Tape & Reel)
TSSOP28 (Tape & Reel)
March 2006
Rev 7
Comments
1000 parts per reel
1350 parts per reel
2500 parts per reel
2500 parts per reel
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