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SP3232EBCA Datasheet(PDF) 8 Page - Sipex Corporation

Part # SP3232EBCA
Description  True 3.0V to 5.5V RS-232 Transceivers
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP3232EBCA Datasheet(HTML) 8 Page - Sipex Corporation

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Date:02/27/05
SP3222EB/3232EB True +3.0 to +5.5V RS-232 Transceivers
© Copyright 2005 Sipex Corporation
8
DESCRIPTION
The SP3222EB/3232EB transceivers meet the
EIA/TIA-232 and V.28/V.24 communication
protocols and can be implemented in battery-
powered, portable, or hand-held applications
such as notebook or palmtop computers. The
SP3222EB/3232EB devices all feature Sipex's
proprietary on-board charge pump circuitry that
generates 2 x V
CC for RS-232 voltage levels
from a single +3.0V to +5.5V power supply.
This series is ideal for +3.3V-only systems,
mixed +3.3V to +5.5V systems, or +5.0V-only
systems that require true RS-232 performance.
The SP3222EB/3232EB series have drivers that
operate at a typical data rate of 250kbps fully
loaded.
The SP3222EB and SP3232EB are 2-driver/2-
receiver devices ideal for portable or hand-held
applications. The SP3222EB features a 1
µA
shutdown mode that reduces power consump-
tion and extends battery life in portable systems.
Its receivers remain active in shutdown mode,
allowing external devices such as modems to be
monitored using only 1
µA supply current.
THEORY OF OPERATION
The SP3222EB/3232EB series are made up of
three basic circuit blocks:
1.
Drivers,
2.
Receivers, and 3. the Sipex proprietary charge
pump.
Drivers
The drivers are inverting level transmitters that
convert TTL or CMOS logic levels to
±5.0V
EIA/TIA-232 levels inverted relative to the in-
put logic levels. Typically, the RS-232 output
voltage swing is
±5.5V with no load and at least
±5V minimum fully loaded. The driver outputs
are protected against infinite short-circuits to
ground without degradation in reliability. Driver
outputs will meet EIA/TIA-562 levels of
±3.7V
with supply voltages as low as 2.7V.
The drivers can guarantee a data rate of 250kbps
fully loaded with 3K
Ω in parallel with 1000pF,
ensuring compatibility with PC-to-PC commu-
nication software.
The slew rate of the driver output is internally
limited to a maximum of 30V/
µs in order to
meet the EIA standards (EIA RS-232D 2.1.7,
Paragraph 5).
The transition of the loaded
output from HIGH to LOW also meets the
monotonicity requirements of the standard.
Figure 10 shows a loopback test circuit used to
the RS-232 drivers. Figure 11 shows the test
results of the loopback circuit with all drivers
active at 120kbps with RS-232 loads in parallel
with 1000pF capacitors. Figure 12 shows the
test results where one driver was active at
250kbps and all drivers loaded with an RS-232
receiver in parallel with a 1000pF capacitor. A
solid RS-232 data transmission rate of 250kbps
provides compatibility with many designs in
personal computer peripherals and LAN appli-
cations.
The SP3222EB driver's output stages are turned
off (tri-state) when the device is in shutdown
mode. When the power is off, the SP3222EB
device permits the outputs to be driven up to
±12V. The driver's inputs do not have pull-up
resistors. Designers should connect unused in-
puts to V
CC or GND.
In the shutdown mode, the supply current falls
to less than 1
µA, where SHDN = LOW. When
the SP3222EB device is shut down, the device's
driver outputs are disabled (tri-stated) and the
charge pumps are turned off with V+ pulled
down to V
CC and V- pulled to GND.
The time
required to exit shutdown is typically 100
µs.
Connect SHDN to V
CC if the shutdown mode is
not used.


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