参数资料
| 型号： | ISL3241EIRZ |
| 厂商： | Intersil |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 ESD-PROT 32-QFN |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 60 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 3/5 |
| 规程： | RS232 |
| 电源电压： | 2.7 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 管件 |
ISL3241E, ISL3243E
10
FN6768.2
June 18, 2012
Software Controlled (Manual) Powerdown
The devices in this family provide pins that allow the user to
force the IC into the low power, standby state.
On the ISL3241E, the powerdown control is via a simple
shutdown (SHDN) pin. Driving this pin high enables normal
operation, while driving it low forces the IC into it’s powerdown
state. Connect SHDN to VL if the powerdown function isn’t
needed. Note that all the receiver outputs remain controlled by
EN during shutdown (see Table 2). For the lowest power
consumption during powerdown, the receivers should also be
disabled by driving the EN input high (see next section, and
The ISL3243E 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 automatic powerdown circuitry.
ISL3243E inverting (standard) receiver outputs also disable
when the device is in manual powerdown, thereby eliminating
the possible current path through a shutdown peripheral’s
Connecting FORCEOFF and FORCEON together disables the
automatic powerdown feature, enabling them to function as a
manual SHUTDOWN input (see Figure 7).
With any of the previous mentioned control schemes, the time
required to exit powerdown, and resume transmission is only
20s. A mouse, or other application, may need more time to
wake up from shutdown. If automatic power-down is being
utilized, the RS-232 device will reenter power-down if valid
receiver levels aren’t reestablished within 20s of the
ISL3243E powering up. Figure 8 illustrates a circuit that keeps
the ISL3243E from initiating automatic power-down for 100ms
after powering up. This gives the slow-to-wake peripheral
circuit time to reestablish valid RS-232 output levels.
VL Logic Supply Input
Note: If VL isn't connected to the Vcc supply, power-up Vcc
before powering up the VL supply.
The ISL324xE feature a VL pin that powers the logic input and
output pins. These pins interface with “logic” devices such as
UARTs, ASICs, and controllers, and today most of these
devices use power supplies significantly lower than 3.3V. Thus,
the logic device’s low VOH might not exceed the VIH of a 3.3V
powered ISL324xE logic input, or a 3.3V receiver output high
level might overdrive and damage the input diodes on an input
of a 1.8V powered logic device, as shown in Figure 9.
Connecting the VL pin to the power supply of the logic device
(see Figure 9) reduces the ISL324xE’s logic input switching
points, and limits the receiver output high voltage, to values
compatible with the logic device’s I/O levels. Tailoring the
ISL324XE’s logic pin input switching points and output levels
FIGURE 6. DISABLED RECEIVERS PREVENT POWER DRAIN
ISL324XE
TRANSITION
RX
TX
R2OUTB
R2OUT
T1IN
FORCEOFF = GND
VCC
VCCL
TO
R2IN
T1OUT
VOUT = HI-Z
POWERED
DETECTOR
DOWN
UART
WAKE-UP
LOGIC
OR
SHDN = GND, EN = VL
VL
VCC
VCCI
FIGURE 7. CONNECTIONS FOR MANUAL POWERDOWN WHEN NO
VALID RECEIVER SIGNALS ARE PRESENT
PWR
FORCEOFF
INVALID
CPU
I/O
FORCEON
ISL3243E
MGT
LOGIC
UART
VCCI
VCC
VCCL
VL
VCC
FIGURE 8. CIRCUIT TO PREVENT AUTO POWERDOWN FOR
100ms AFTER FORCED POWERUP
ISL3243E
FORCEOFF
FORCEON
POWER
MASTER POWERDOWN LINE
1M
0.1F
MANAGEMENT
UNIT
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL3241EIRZ-T | 功能描述:IC TXRX RS232 ESD-PROT 32-QFN 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) |
| ISL32430E | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:?±40V Fault Protected, 3.3V to 5V, ?±15V Common Mode Range, RS-485/RS-422 Transceivers With Cable Invert and ?±15kV ESD |
| ISL32430EIBZ | 功能描述:IC TRANSCEIVER 14-SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:发射器 驱动器/接收器数:4/0 规程:RS422，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| ISL32430EIBZ-T | 功能描述:IC TRANSCEIVER 14-SOIC RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:* 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 类型:发射器 驱动器/接收器数:4/0 规程:RS422，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| ISL32430EIBZ-T7A | 功能描述:RS-422/RS-485 接口 IC 40V OVP 15V CMR -40+ 85 3V RS-485 FL DUP RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube |
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