SLLS350E – APRIL 1999 – REVISED OCTOBER 2000
MAX3243
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH
±15-kV
ESD (HBM) PROTECTION
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 MAX3243C is characterized for operation from 0°C to 70°C. The MAX3243I is characterized for operation
from –40°C to 85°C.
AVAILABLE OPTIONS
PACKAGED DEVICES
TA
0°C to 70°C
–40°C to 85°C
SHRINK
SMALL OUTLINE
(DB)
MAX3243CDBR
MAX3243IDBR
SMALL OUTLINE
(DW)
MAX3243CDW
MAX3243IDW
THIN SHRINK
SMALL OUTLINE
(PW)
MAX3243CPWR
MAX3243IPWR
The DB and PW packages are only available taped and reeled. The DW package is also
available taped and reeled. Add the suffix R to device type (e.g., MAX3243CDWR).
Function Tables
EACH DRIVER
INPUTS
DIN
X
L
H
L
H
L
H
FORCEON
X
H
H
L
L
L
L
FORCEOFF
L
H
H
H
H
H
H
VALID RIN
RS-232 LEVEL
X
X
X
Yes
Yes
No
No
OUTPUT
DOUT
Z
H
L
H
L
Z
Z
DRIVER STATUS
Powered off
Normal operation with
auto-powerdown disabled
Normal operation with
auto-powerdown enabled
Powered off by
y
auto-powerdown feature
H = high level, L = low level, X = irrelevant, Z = high impedance
2
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
