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参数资料
| 型号： | SP3220ECT |
| 元件分类： | 外设及接口 |
| 英文描述： | Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C |
| 中文描述： | 电可擦除可编程逻辑器件 |
| 文件页数： | 8/18页 |
| 文件大小： | 114K |
| 代理商： | SP3220ECT |
11/07/02 SP3220E True +3.0 to +5.0V RS-232 Transceivers
Copyright 2002 Sipex Corporation
8
DESCRIPTION
The
SP3220E
device meets 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
SP3220E
device features
Sipex's
proprietary 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 +3.0V to +5.5V
systems, or +5.0V-only systems that require true
RS-232 performance. The
SP3220E
device has
a driver that operates at a typical data rate of
235Kbps fully loaded.
The
SP3220E
is a 1-driver/1-receiver device
ideal for portable or hand-held applications.
The
SP3220E
features a 1
μ
A shutdown mode
that reduces power consumption 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
SP3220E
device is 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
input 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 typically can operate at a data rate
of 235Kbps. The drivers can guarantee a data
rate of 120Kbps fully loaded with 3K
in
parallel with 1000pF, ensuring compatibility
with PC-to-PC communication 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.
The
SP3220E
driver can maintain high data
rates up to 235Kbps fully loaded.
Figure 6
shows
a loopback test circuit used to test the
RS-232 driver.
Figure 7
shows the test results of
the loopback circuit with the driver active at
120Kbps with an RS-232 load in parallel with a
1000pF capacitor.
Figure 8
shows the test results
where the driver was active at 235Kbps and
loaded with an RS-232 receiver in parallel with
a 1000pF capacitor. A solid RS-232 data
transmission rate of 120Kbps provides
compatibility with many designs in personal
computer peripherals and LAN applications.
The
SP3220E
driver's output stage is turned off
(high-Z) when the device is in shutdown mode.
When the power is off, the
SP3220E
device
permits the outputs to be driven up to +12V. The
driver's input does not have pull-up resistors.
Designers should connect an unused input
to V
CC
or GND.
In the shutdown mode, the supply current falls to
less than 1
μ
A, where SHDN = LOW. When the
SP3220E
device is shut down, the device's
driver output is disabled (high-Z) and the charge
pump is 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
if the shutdown mode is not used. SHDN has
no effect on RxOUT.
Note that the driver is
enabled only when the magnitude of V- exceeds
approximately 3V.
相关PDF资料 |
PDF描述 |
|---|---|
| SP3220ECY | Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C |
| SP3220EET | Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C |
| SP3220EEY | Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C |
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| SP3220E | Single Supply RS232C Line Driver/Receiver(?????μ?o?RS232C ?o?????????¨???2???2??????) |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3220ECT-L | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP3220ECT-L/TR | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP3220ECT-LTR | 制造商:EXAR 制造商全称:EXAR 功能描述:3.0V to 5.5V RS-232 Driver/Receiver Pair |
| SP3220ECY | 制造商:Exar Corporation 功能描述:Line Transceiver, 1-Driver, 1-Receiver, 16 Pin, Plastic, TSSOP |
| SP3220ECY-L | 功能描述:RS-232接口集成电路 RS232 1drvr/1rcvr temp 0C to 70C RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
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