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TRS3318

SLLS820A –AUGUST 2007–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.

DESCRIPTION (CONTINUED)

This device is available in two space-saving packages: 20-pin SSOP and 20-pin TSSOP.

Flexible control options for power management are featured when the serial port and driver inputs are

inactive. The auto-powerdown 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-powerdown plus can be

disabled when FORCEON and FORCEOFF are high. With auto-powerdown 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-Powerdown Plus Conditions

Normal operation,

H H No No Active Active L H auto-powerdown

plus disabled

Normal operation,

H H No Yes Active Active H H auto-powerdown

plus disabled

Normal operation,

L H Yes No Active Active L H auto-powerdown

plus enabled

Normal operation,

L H Yes Yes Active Active H H auto-powerdown

plus enabled

Power down,

L H No No Z Active L L auto-powerdown

plus enabled

Power down,

L H No Yes Z Active H L auto-powerdown

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-Powerdown Conditions

Power down,

INVALID INVALID X No Z Active L L auto-powerdown

enabled

Normal operation,

INVALID INVALID X Yes Active Active H H auto-powerdown

enabled

(1) H = high level, L = low level, X = irrelevant, Z = high impedance

Product Folder Links: TRS3318

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