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SP3282EB Datasheet(PDF) 10 Page - Sipex Corporation

Part # SP3282EB
Description  Intelligent 2.35V to 5.5V RS-232 Transceivers
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP3282EB Datasheet(HTML) 10 Page - Sipex Corporation

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Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
10
AUTO ON-LINE® Circuitry
The SP3282EB device has a patent pending
AUTO ON-LINE® circuitry on board that saves
power in applications such as laptop computers,
palmtop (PDA) computers, and other portable
systems.
The SP3282EB device incorporates an
AUTO ON-LINE® circuit that automatically
enables itself when the external transmitters are
enabled and the cable is connected. Conversely,
the AUTO ON-LINE® circuit also disables most
of the internal circuitry when the device is not
being used and goes into a standby mode where the
device typically draws 1
µA. This function is
controlled by the ONLINE pin. When this pin is
tied to a logic LOW, the AUTO ON-LINE® func-
tion is active. Once active, the device is enabled
until there is no activity on the receiver inputs. The
Table 3. AUTO ON-LINE® Logic
N
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Figure 16. Stage II of AUTO ON-LINE® Circuitry
STATUS
Delay
Stage
Delay
Stage
Delay
Stage
R1 INACT
R2 INACT
R3 INACT
receiver input typically sees at least +3V, which
are generated from the transmitters at the other end
of the cable with a +5V minimum. When the
external transmitters are disabled or the cable is
disconnected, the receiver inputs will be pulled
down by their internal 5k
Ω resistors to ground.
When this occurs over a period of time, the internal
transmitters will be disabled and the device goes
into a shutdown or standby mode. When ONLINE
is HIGH, the AUTO ON-LINE® mode is disabled.
The AUTO ON-LINE® circuit has two stages:
1) Inactive Detection
2) Accumulated Delay
The first stage, shown in Figure 15, detects an
inactive input. A logic HIGH is asserted on
R
XINACT if the cable is disconnected or the


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