MAX3243E
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH
±15-kV
IEC ESD PROTECTION
SLLS657A – APRIL 2005 – REVISED JUNE 2005
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DESCRIPTION (CONTINUED)
Flexible control options for power management are available when the serial port is inactive. The
auto-powerdown 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 (except ROUT2B) are shut off, and the supply current is reduced to 1
µA.
Disconnecting the serial port or turning off the peripheral drivers 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. The INVALID output is used to notify the user if an RS-232 signal is present at any
receiver input. INVALID is high (valid data) if any receiver input voltage is greater than 2.7 V or less than –2.7 V
or has been between –0.3 V and 0.3 V for less than 30
µs.
INVALID is low (invalid data) if all receiver input
voltages are between –0.3 V and 0.3 V for more than 30
µs.
Refer to Figure 5 for receiver input levels.
The MAX3243EC is characterized for operation from 0°C to 70°C. The MAX3243EI is characterized for operation
from –40°C to 85°C.
AVAILABLE OPTIONS
PACKAGED DEVICES
(1)
T
A
SHRINK
SMALL OUTLINE
(DB)
MAX3243ECDB
MAX3243EIDB
SMALL OUTLINE
(DB)
MAX3243ECDW
MAX3243EIDW
THIN SHRINK
SMALL OUTLINE
(PW)
MAX3243ECPW
MAX3243EIPW
QUAD FLAT
NO-LEAD
(RHB)
MAX3243ECRHBR
(Preview)
MAX3243EIRHBR
(Preview)
0°C to 70°C
–40°C to 85°C
(1)
The DB, DW, and PW packages are available in both tube and taped & reeled. Add the suffix R to orderable (e.g. MAX3243ECDBR for
taped & reeled version).
2
TI [ TEXAS INSTRUMENTS ]
