Datasheet

MAX3318E
SLLS741A –JUNE 2006–REVISED OCTOBER 2013 www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
DETAILED DESCRIPTION
Flexible control options for power management are featured when the serial port and driver inputs are inactive.
The auto-power-down plus feature functions when FORCEON is low and FORCEOFF is high. During this mode
of operation, if the device does not sense valid signal transitions on all receiver and driver inputs for
approximately 30 s, the built-in charge pump and drivers are powered down, reducing the supply current to 1 μA.
By disconnecting the serial port or placing the peripheral drivers off, auto-power-down plus can be disabled when
FORCEON and FORCEOFF are high. With auto-power-down plus enabled, the device activates automatically
when a valid signal is applied to any receiver or driver 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
(typical number). INVALID is low (invalid data) if all receiver input voltage are between –0.3 V and 0.3 V for more
than 30 μs (typical number).
FUNCTION TABLE
(1)
INPUT CONDITIONS OUTPUT STATES
VALID
RECEIVER
OPERATING
RS-232
OR DRIVER
MODE
FORCEON FORCEOFF LEVEL DRIVER RECEIVER INVALID READY
EDGE
PRESENT AT
WITHIN 30 s
RECEIVER
Auto-Power-Down Plus Conditions
Normal operation,
H H No No Active Active L H auto-power-down
plus disabled
Normal operation,
H H No Yes Active Active H H auto-power-down
plus disabled
Normal operation,
L H Yes No Active Active L H auto-power-down
plus enabled
Normal operation,
L H Yes Yes Active Active H H auto-power-down
plus enabled
Power down,
L H No No Z Active L L auto-power-down
plus enabled
Power down,
L H No Yes Z Active H L auto-power-down
plus enabled
Manual power
X L X No Z Active L L
down
Manual power
X L X Yes Z Active H L
down
Auto-Power-Down Conditions
Power down, auto
INVALID INVALID X No Z Active L L power down
enabled
Normal operation,
INVALID INVALID X Yes Active Active H H auto power down
enabled
(1) H = high level, L = low level, X = irrelevant, Z = high impedance
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