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SP3232EBCA 参数 Datasheet PDF下载

SP3232EBCA图片预览
型号: SP3232EBCA
PDF下载: 下载PDF文件 查看货源
内容描述: 真正的+ 3.0V至+ 5.5V的RS - 232收发器 [True +3.0V to +5.5V RS-232 Transceivers]
分类和应用:
文件页数/大小: 20 页 / 149 K
品牌: SIPEX [ SIPEX CORPORATION ]
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DESCRIPTION  
Thedriverscanguaranteeadatarateof 250kbps  
fully loaded with 3Kin parallel with 1000pF,  
ensuring compatibility with PC-to-PC commu-  
nication software.  
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 VCC 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.  
TheSP3222EB/3232EBserieshavedriversthat  
operate at a typical data rate of 250kbps fully  
loaded.  
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 and SP3232EB are 2-driver/2-  
receiver devices ideal for portable or hand-held  
applications. The SP3222EB features a 1µA  
shutdown mode that reduces power consump-  
tionandextendsbatterylifeinportablesystems.  
Its receivers remain active in shutdown mode,  
allowing external devices such as modems to be  
monitored using only 1µA supply current.  
The SP3222EB driver'soutputstagesareturned  
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 VCC or GND.  
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.  
In the shutdown mode, the supply current falls  
to less than 1µA, 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 VCC and V- pulled to GND. The time  
required to exit shutdown is typically 100µs.  
Connect SHDN to VCC if the shutdown mode is  
not used.  
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  
groundwithoutdegradationinreliability. Driver  
outputs will meet EIA/TIA-562 levels of ±3.7V  
with supply voltages as low as 2.7V.  
Rev. A Date:12/11/03  
SP3222EB/3232EB True +3.0 to +5.5V RS-232 Transceivers  
© Copyright 2003 Sipex Corporation  
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