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参数资料
| 型号： | SP3220BEY |
| 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： | 9/18页 |
| 文件大小： | 115K |
| 代理商： | SP3220BEY |
9
Rev. 7/8/03 SP3220B/U +3.0 to +5.0V RS-232 Transceivers
Copyright 2003 Sipex Corporation
DESCRIPTION
The
SP3220B/U
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
SP3220B/
U
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
SP3220B
device has
a driver that can operate at a data rate of 250Kbps
fully loaded. The
SP3220U
can Operate at
1000Kbps
The
SP3220B/U
is a 1-driver/1-receiver device
ideal for portable or hand-held applications.
The
SP3220B/U
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
SP3220B/U
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
SP3220B
drivers typically can operate at a
data rate of 250Kbps fully loaded with 3K
in
parallel with 1000pF, ensuring compatibility
with PC-to-PC communication software.
The SP3220U drivers can guarantee a data rate
of 1000Kbps fully loaded with 3
in parallel
with 250pF.
The slew rate of the SP3220B 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 12
shows a loopback circuit used to test
the RS-232 driver.
Figure 13
shows the test
results of the loopback circuit with the
SP3220B
driver active at 250Kbps with an RS-232 load in
parallel with a 1000pF capacitor.
Figure 14
shows the test results where the
SP3220U
driver
was active at 1000Kbps and loaded with an RS-
232 receiver in parallel with a 250pF capacitor.
A solid RS-232 data transmission rate of 250Kbps
provides compatibility with many designs in
personal computer peripherals and LAN appli-
cations.
The
SP3220B/U
driver's output stage is turned
off (high-Z) when the device is in shutdown
mode. When the power is off, the
SP3220B/U
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
SP3220B/U
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 |
|---|---|
| SP3220UCT | 320 x 240 pixel format, LED or CFL Backlight |
| SP3220EBCA | 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 |
| SP3220EUCA | 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 |
| SP3220EUET | 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 |
| SP3220EUEY | 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 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3220CA | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:+3.0V to +5.5V RS-232 Driver/Receiver Pair |
| SP3220CT | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:+3.0V to +5.5V RS-232 Driver/Receiver Pair |
| SP3220CY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:+3.0V to +5.5V RS-232 Driver/Receiver Pair |
| SP3220E | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:+3.0V to +5.5V RS-232 Driver/Receiver Pair |
| SP3220E_05 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:+3.0V to +5.5V RS-232 Driver/Receiver Pair |
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