ST3243EB Datasheet, PDF (1/16 Pages) STMicroelectronics – Guaranteed 6 V/ms slew rate range

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
Description
The 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.
TSSOP
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
Order codes Temperature range
ST3243ECTR-E
0 to 70 °C
ST3243EBTR
- 40 to 85 °C
Package
TSSOP28 (tape and reel)
TSSOP28 (tape and reel)
Packaging
2500 parts per reel
2500 parts per reel
October 2009
Doc ID 8648 Rev 12
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www.st.com
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