MAX3243-EP Datasheet, PDF (2/15 Pages) Texas Instruments – 3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER WITH ±15-kV ESD (HBM) PROTECTION

MAX3243-EP
3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER
WITH ±15-kV ESD (HBM) PROTECTION
SGLS328A – MARCH 2006 – REVISED MAY 2006
www.ti.com
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. See Figure 5 for receiver input levels.
T_A
–55°C to 125°C
ORDERING INFORMATION
PACKAGE ⁽¹⁾
ORDERABLE PART NUMBER
SSOP – DB
Reel of 2000
MAX3243MDBREP
TSSOP – PW
Reel of 2000
MAX3243MPWREP
TOP-SIDE MARKING
MB3243M
MB3243M
(1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
FUNCTION TABLES
Each Driver⁽¹⁾
INPUTS
OUTPUT
DIN
FORCEON
FORCEOFF
VALID RIN
RS-232 LEVEL
DOUT
DRIVER STATUS
X
X
L
X
Z
Powered off
L
H
H
X
H
Normal operation with auto-powerdown
H
H
H
X
L
disabled
L
L
H
YES
H
Normal operation with auto-powerdown
H
L
H
YES
L
enabled
L
L
H
NO
Z
Power off by auto-powerdown feature
H
L
H
NO
Z
(1) H = high level, L = low level, X = irrelevant, Z = high impedance
Each Receiver⁽¹⁾
RIN2
L
H
L
L
H
H
Open
INPUTS
RIN1,
RIN3–RIN5
FORCEOFF
X
L
X
L
L
H
H
H
L
H
H
H
Open
H
VALID RIN
RS-232 LEVEL
X
X
YES
YES
YES
YES
YES
OUTPUTS
ROUT2B ROUT
L
Z
H
Z
L
H
L
L
H
H
H
L
L
H
RECEIVER STATUS
Powered off while ROUT2B is active
Normal operation with auto-powerdown
disabled/enabled
(1) H = high level, L = low level, X = irrelevant, Z = high impedance (off), Open = input disconnected or connected driver off
2
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