参数资料
| 型号： | SP3232EHCA-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 15/16页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 ESD 16SSOP |
| 产品变化通告： | Interface Product Discontinuation 10/May/2011 |
| 标准包装： | 1,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 2/2 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 带卷 (TR) |
8
Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7017 www.exar.com
SP3232EH_102_031413
The
SP3232EH is a 2-driver / 2-receiver
devices ideal for portable or hand-held
applications. The
SP3232EH transceiver
meets the EIA/TIA-232 and ITU-T V.28/V.24
communication protocols and can be imple-
mented in battery-powered, portable, or
hand-held applications such as notebook or
palmtop computers. The
SP3232EH device
features
Exar'sproprietaryon-boardcharge
pump circuitry that generates ±5.5V for RS-
232 voltage levels from a single +3.0V to
+5.5V power supply. This device 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
SP3232EH
device can operate at a minimum data rate
of 460kbps when fully loaded.
THEORY OF OPERATION
The
SP3232EH is made up of three basic
circuit blocks:
1. Drivers
2. Receivers
3. The Exar proprietary charge pump
Drivers
The drivers are inverting level transmitters
that convert TTL or CMOS logic levels to
+5.0V EIA/TIA-232 levels with an inverted
sense relative to the input logic levels.
Typically, the RS-232 output voltage swing
is +5.4V with no load and +5V minimum fully
loaded. The driver outputs are protected
against infinite short-circuits to ground with-
out degradation in reliability. Driver outputs
will meet EIA/TIA-562 levels of +/-3.7V with
supply voltages as low as 2.7V.
The drivers have a minimum data rate of
460kbps fully loaded with 3k in parallel
with 1000pF, ensuring compatibility with
PC-to-PC communication software.
Figure 6 shows a loopback test circuit
used to test the RS-232 Drivers. Figure
7 shows the test results of the loopback
circuit with all drivers active at 120kbps
with RS-232 loads in parallel with a
1000pF capacitor. Figure 8 shows the
test results where one driver was active
at 460kbps and all drivers loaded with an
RS-232 receiver in parallel with 1000pF
capacitor.Designersshouldconnectunused
inputs to Vcc or GND.
Receivers
The Receivers convert EIA/TIA-232 levels
to TTL or CMOS logic output levels. Since
receiver input is usually from a transmission
line where long cable lengths and system
interference can degrade the signal, the
inputs have a typical hysteresis margin of
300mV. This ensures that the receiver is
virtually immune to noisy transmission lines.
Should an input be left unconnected, an
internal 5k pulldown resistor to ground
will commit the output of the receiver to a
HIGH state.
Charge Pump
The charge pump is an Exar-patended
design (U.S. 5,306,954) and uses a unique
approach compared to older less-efficient
designs. The charge pump still requires four
external capacitors, but uses a four-phase
voltage shifting technique to attain sym-
metrical 5.5V power supplies. The internal
power supply consists of a regulated dual
charge pump that provides output voltages
of +/-5.5V regardless of the input voltage
(Vcc) over the +3.0V to +5.5V range.
In most circumstances, decoupling the
power supply can be achieved adequately
using a 0.1F bypass capacitor at C5 (refer
to figure 5)
In applications that are sensitive to power-
supply noise, decouple Vcc to ground with a
capacitor of the same value as charge-pump
capacitor C1. Physically connect bypass
capacitors as close to the IC as possible.
The charge pump operates in a discontinu-
ous mode using an internal oscillator. If the
output voltages are less than a magnitude
DESCRIPTION
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP3232EHCP | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3.3V, 460 Kbps RS-232 Transceivers |
| SP3232EHCP-L | 功能描述:RS-232接口集成电路 3.3V 460KBPS RS-232 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: |
| SP3232EHCT | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3.3V, 460 Kbps RS-232 Transceivers |
| SP3232EHCT/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3.3V, 460 Kbps RS-232 Transceivers |
| SP3232EHCT-L | 功能描述:RS-232接口集成电路 3.3V 460KBPS RS-232 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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