MAX3243
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
SLLS350B – APRIL 1999 – REVISED JANUARY 2000
description (continued)
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)
MAX3243CDB
MAX3243IDB
SMALL OUTLINE
(DW)
MAX3243CDW
MAX3243IDW
THIN SHRINK
SMALL OUTLINE
(PW)
MAX3243CPW
MAX3243IPW
PRODUCT PREVIEW
The DB, DW, and PW packages are available taped and reeled. Add the suffix R to
device type (e.g., MAX3243CDBR).
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
EACH RECEIVER
INPUTS
RIN2
L
H
L
L
H
H
Open
RIN1,
RIN3–RIN5
X
X
L
H
L
H
Open
FORCEOFF
L
L
H
H
H
H
H
VALID RIN
RS-232 LEVEL
X
X
Yes
Yes
Yes
Yes
No
OUTPUTS
ROUT2B
L
H
L
L
H
H
L
ROUT
Z
Z
H
L
H
L
H
Normal operation with
o eration
auto-powerdown
di bl d/
bl d
disabled/enabled
RECEIVER STATUS
Powered off while
ROUT2B is active
H = high level, L = low level, X = irrelevant, Z = high impedance (off), Open = input disconnected or connected
driver off
2
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