參數(shù)資料
型號(hào)： SP3222B
元件分類： RS-232
英文描述： 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
中文描述： 5V的高速RS - 232收發(fā)器與0.1uF電容
文件頁(yè)數(shù)： 8/18頁(yè)
文件大?。?/td> 139K
代理商： SP3222B
Rev. 6/30/03 SP3222B/3232B True +3.0 to +5.5V RS-232 Transceivers
Copyright 2003 Sipex Corporation
8
DESCRIPTION
The
SP3222B/3232B
transceivers meet the EIA/
TIA-232 and V.28/V.24 communication proto-
cols and can be implemented in battery-pow-
ered, portable, or hand-held applications such
as notebook or palmtop computers. The
SP3222B/3232B
devices all feature
Sipex's
pro-
prietary on-board charge pump circuitry that
generates 2 x V
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
SP3222B/3232B
series have drivers that
operate at a typical data rate of 250kbps fully
loaded.
The
SP3222B
and
SP3232B
are 2-driver/2-
receiver devices ideal for portable or hand-held
applications. The
SP3222B
features a 1
μ
A
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
μ
A supply current.
THEORY OF OPERATION
The
SP3222B/3232B
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
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/
μ
s 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
SP3222B
driver's output stages are turned
off (tri-state) when the device is in shutdown
mode. When the power is off, the
SP3222B
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
μ
A, where SHDN = LOW. When
the
SP3222B
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
and V- pulled to GND. The time
required to exit shutdown is typically 100
μ
s.
Connect SHDN to V
CC
if the shutdown mode is
not used.
相關(guān)PDF資料
PDF描述
SP3222BCA 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
SP3222BCP 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
SP3222BCT 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
SP3222BCY 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
SP3222BEA 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP3222BCA 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:True +3.0V to +5.5V RS-232 Transceivers
SP3222BCP 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:True +3.0V to +5.5V RS-232 Transceivers
SP3222BCT 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:True +3.0V to +5.5V RS-232 Transceivers
SP3222BCY 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:True +3.0V to +5.5V RS-232 Transceivers
SP3222BEA 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:True +3.0V to +5.5V RS-232 Transceivers
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