ꢀ
ꢁ
ꢂ
ꢃꢄ
ꢅ
ꢃ
ꢞ
ꢃ
ꢆ
ꢇ
ꢈꢉ
ꢊ
ꢋ
ꢊꢆ
ꢇ
ꢀ
ꢌ
ꢍ
ꢈ
ꢎ
ꢏ
ꢐ
ꢁ
ꢑ
ꢑ
ꢒ
ꢍ
ꢓ
ꢔ
ꢆ
ꢄ
ꢃ
ꢄ
ꢍ
ꢎ
ꢑ
ꢒ
ꢕ
ꢓ
ꢎ
ꢇ
ꢒ
ꢓ
ꢖ
ꢓ
ꢒ
ꢏ
ꢒ
ꢎ
ꢇ
ꢒ
ꢓ
ꢗ
ꢎ
ꢈ
ꢐ
ꢘ
ꢊꢆ
ꢙ
ꢇ
ꢒ
ꢔ
ꢕ
ꢚ
ꢐ
ꢛ
ꢀ
ꢜ
ꢝ
ꢓ
ꢉ
ꢈꢒ
ꢏ
ꢈ
ꢎ
ꢉ
ꢑ
SLLS350L − APRIL 1999 − REVISED MARCH 2004
description/ordering information (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.
ORDERING INFORMATION
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
†
T
A
PACKAGE
Tube of 20
Reel of 1000
Tube of 50
Reel of 2000
Tube of 50
Reel of 2000
Tube of 20
Reel of 1000
Tube of 50
Reel of 2000
Tube of 50
Reel of 2000
MAX3243CDW
MAX3243CDWR
MAX3243CDB
MAX3243CDBR
MAX3243CPW
MAX3243CPWR
MAX3243IDW
MAX3243IDWR
MAX3243IDB
SOIC (DW)
SSOP (DB)
TSSOP (PW)
SOIC (DW)
SSOP (DB)
TSSOP (PW)
MAX3243C
MAX3243C
MA3243C
MAX3243I
MAX3243I
MB3243I
0°C to 70°C
−40°C to 85°C
MAX3243IDBR
MAX3243IPW
MAX3243IPWR
†
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are
available at www.ti.com/sc/package.
Function Tables
EACH DRIVER
INPUTS
OUTPUT
DOUT
VALID RIN
RS-232 LEVEL
DRIVER STATUS
DIN
FORCEON
FORCEOFF
X
L
X
H
H
L
L
X
X
Z
H
L
Powered off
H
H
H
H
H
H
Normal operation with
auto-powerdown disabled
H
L
X
Yes
Yes
No
No
H
L
Normal operation with
auto-powerdown enabled
H
L
L
L
Z
Z
Powered off by
auto-powerdown feature
H
L
H = high level, L = low level, X = irrelevant, Z = high impedance
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
