参数资料
| 型号： | ISL83387EIV-T |
| 厂商： | Intersil |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC 3DRVR/3RCVR RS232 3V 24-TSSOP |
| 标准包装： | 2,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 3/3 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP |
| 包装： | 带卷 (TR) |
6
FN6040.1
July 8, 2005
Detailed Description
The ISL83387E operates from a single +3V to +5.5V supply,
guarantees a 250kbps minimum data rate, requires only four
small external 0.1
F capacitors, features low power
consumption, and meets all ElA RS-232C and V.28
specifications. The circuit is divided into three sections: The
charge pump, the transmitters, and the receivers.
Charge-Pump
Intersil’s new ISL83387E utilizes regulated on-chip dual
charge pumps as voltage doublers, and voltage inverters to
generate
±5.5V transmitter supplies from a VCC supply as
low as 3.0V. This allows these devices to maintain RS-232
compliant output levels over the
±10% tolerance range of
3.3V powered systems. The efficient on-chip power supplies
require only four small, external 0.1
F capacitors for the
voltage doubler and inverter functions over the full VCC
range; other capacitor combinations can be used as shown
in Table 3. The charge pumps operate discontinuously (i.e.,
they turn off as soon as the V+ and V- supplies are pumped
up to the nominal values), resulting in significant power
savings.
Transmitters
The transmitters are proprietary, low dropout, inverting
drivers that translate TTL/CMOS inputs to EIA/TIA-232
output levels. Coupled with the on-chip
±5.5V supplies,
these transmitters deliver true RS-232 levels over a wide
range of single supply system voltages.
All transmitter outputs disable and assume a high
impedance state when the device enters the powerdown
mode (see Table 2). These outputs may be driven to
±12V
when disabled.
All devices guarantee a 250kbps data rate for full load
conditions (3k
and 1000pF), VCC ≥ 3.0V, with one
transmitter operating at full speed. Under more typical
conditions of VCC ≥ 3.3V, RL =3k, and CL = 250pF, one
transmitter easily operates at 1.25Mbps.
The transmitter input threshold is set by the voltage applied
to the VL supply pin. Transmitter inputs float if left
unconnected (there are no pull-up resistors), and may cause
ICC increases. Connect unused inputs to GND for the best
performance.
Receivers
The ISL83387E contains standard inverting receivers that
convert RS-232 signals to CMOS output levels and accept
inputs up to
±25V while presenting the required 3k to 7k
input impedance (see Figure 1) even if the power is off
(VCC = 0V). The receivers’ Schmitt trigger input stage uses
hysteresis to increase noise immunity and decrease errors
due to slow input signal transitions. Receiver outputs swing
from GND to VL, and do not tristate in powerdown (see
Table 2).
Low Power Operation
This 3V device requires a nominal supply current of 0.3mA,
even at VCC = 5.5V, during normal operation (not in
powerdown mode). This is considerably less than the 11mA
current required by comparable 5V RS-232 devices, allowing
users to reduce system power simply by replacing the old
style device with the ISL83387E in new designs.
Powerdown Functionality
The already low current requirement drops significantly
when the device enters powerdown mode. In powerdown,
supply current drops to 1
A, because the on-chip charge
pump turns off (V+ collapses to VCC, V- collapses to GND),
and the transmitter outputs tristate. This micro-power mode
makes these devices ideal for battery powered and portable
applications.
Software Controlled (Manual) Powerdown
This device allows the user to force the IC into the low
power, standby state, and utilizes a two pin approach where
the FORCEON and FORCEOFF inputs determine the IC’s
mode. For always enabled operation, FORCEON and
FORCEOFF are both strapped high. To switch between
active and powerdown modes, under logic or software
control, only the FORCEOFF input need be driven. The
FORCEON state isn’t critical, as FORCEOFF dominates
over FORCEON. Nevertheless, if strictly manual control over
powerdown is desired, the user must strap FORCEON high
to disable the enhanced automatic powerdown circuitry.
Connecting FORCEOFF and FORCEON together disables
the enhanced automatic powerdown feature, enabling them
to function as a manual SHUTDOWN input (see Figure 2).
With any of the above control schemes, the time required to
exit powerdown, and resume transmission is only 100
s.
When using both manual and enhanced automatic
powerdown (FORCEON = 0), the ISL83387E won’t power
up from manual powerdown until both FORCEOFF and
FORCEON are driven high, or until a transition occurs on a
receiver or transmitter input. Figure 3 illustrates a circuit for
ensuring that the ISL83387E powers up as soon as
FORCEOFF switches high. The rising edge of the Master
Powerdown signal forces the device to power up, and the
ISL83387E returns to enhanced automatic powerdown
RXOUT
GND
≤ VROUT ≤ VL
5k
RXIN
-25V
≤ VRIN ≤ +25V
GND
VL
FIGURE 1. RECEIVER CONNECTIONS
ISL83387E
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相关代理商/技术参数 |
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| ISL83387EIVZ | 功能描述:RS-232接口集成电路 W/ANNEAL RS232 3V 3D /3R 15KV SHTDWN 24LD 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: |
| ISL83387EIVZ-T | 功能描述:IC 3DRVR/3RCVR RS232 3V 24-TSSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:250 系列:- 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-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:带卷 (TR) |
| ISL83483 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:3.3V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers |
| ISL83483_04 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:3.3V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers |
| ISL83483IB | 功能描述:IC TXRX RS-485/422 8-SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:1,000 系列:- 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-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
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