参数资料
| 型号： | ISL4270EIRZ |
| 厂商： | Intersil |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC 3DRVR/3RCVR RS232 3V 32-QFN |
| 标准包装： | 60 |
| 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： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN 裸露焊盘（5x5） |
| 包装： | 管件 |
7
FN6041.2
June 16, 2010
mode an RC time constant after this rising edge. The time
constant isn’t critical, because the ISL4270E remains
powered up for 30 seconds after the FORCEON falling edge,
even if there are no signal transitions. This gives slow-to-
wake systems (e.g., a mouse) plenty of time to start
transmitting, and as long as it starts transmitting within 30
seconds both systems remain enabled.
VL Logic Supply Input
Unlike other RS-232 interface devices where the CMOS
outputs swing between 0 and VCC, the ISL4270E features a
separate logic supply input (VL; 1.8V to 5V, regardless of
VCC) that sets VOH for the receiver and INVALID outputs.
Connecting VL to a host logic supply lower than VCC,
prevents the ISL4270E outputs from forward biasing the
input diodes of a logic device powered by that lower supply.
Connecting VL to a logic supply greater than VCC ensures
that the receiver and INVALID output levels are compatible
even with the CMOS input VIH of AC, HC, and CD4000
devices. Note that the VL supply current increases to 100μA
powers the transmitter and logic inputs, thereby setting their
switching thresholds to levels compatible with the logic
supply. This separate logic supply pin allows a great deal of
flexibility in interfacing to systems with different logic
supplies. If logic translation isn’t required, connect VL to the
ISL4270E VCC.
TABLE 2. POWERDOWN LOGIC TRUTH TABLE
RCVR OR XMTR
EDGE WITHIN 30
SEC?
FORCEOFF
INPUT
FORCEON
INPUT
TRANSMITTER
OUTPUTS
RECEIVER
OUTPUTS
RS-232 LEVEL
PRESENT AT
RECEIVER INPUT?
INVALID
OUTPUT
MODE OF OPERATION
NO
H
Active
NO
L
Normal Operation (Enhanced
Auto Powerdown Disabled)
NO
H
Active
YES
H
YES
H
L
Active
NO
L
Normal Operation (Enhanced
Auto Powerdown Enabled)
YES
H
L
Active
YES
H
NO
H
L
High-Z
Active
NO
L
Powerdown Due to Enhanced
Auto Powerdown Logic
NO
H
L
High-Z
Active
YES
H
X
L
X
High-Z
Active
NO
L
Manual Powerdown
X
L
X
High-Z
Active
YES
H
INVALID DRIVING FORCEON AND FORCEOFF (EMULATES AUTOMATIC POWERDOWN)
X
NOTE 5
Active
YES
H
Normal Operation
X
NOTE 5
High-Z
Active
NO
L
Forced Auto Powerdown
NOTES:
5. Input is connected to INVALID Output.
FIGURE 2. CONNECTIONS FOR MANUAL POWERDOWN
PWR
FORCEOFF, FORCEON
CPU
I/O
ISL4270E
MGT
LOGIC
UART
VL
I/O CHIP
POWER SUPPLY
VCC
INVALID
FIGURE 3. CIRCUIT TO ENSURE IMMEDIATE POWER UP
WHEN EXITING FORCED POWERDOWN
FORCEOFF
FORCEON
POWER
MASTER POWERDOWN LINE
1M
Ω
0.1
μF
MANAGEMENT
UNIT
ISL4270E
ISL4270E
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL4270EIRZ-T | 功能描述:IC XMITTER/RCVR ESD RS232 32-QFN 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:50 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 产品目录页面:1402 (CN2011-ZH PDF) |
| ISL43110 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Low-Voltage, Single Supply, SPST, High Performance Analog Switches |
| ISL43110_05 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Low-Voltage, Single Supply, SPST, High Performance Analog Switches |
| ISL43110IB | 功能描述:IC SWITCH SPST 8SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 标准包装:48 系列:- 功能:开关 电路:4 x SPST - NO 导通状态电阻:100 欧姆 电压电源:单/双电源 电压 - 电源，单路/双路(±):2 V ~ 12 V，±2 V ~ 6 V 电流 - 电源:50nA 工作温度:-40°C ~ 85°C 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:管件 |
| ISL43110IB-T | 功能描述:IC SWITCH SPST 8SOIC RoHS:否 类别:集成电路 (IC) >> 接口 - 模拟开关，多路复用器，多路分解器 系列:- 标准包装:48 系列:- 功能:开关 电路:4 x SPST - NO 导通状态电阻:100 欧姆 电压电源:单/双电源 电压 - 电源，单路/双路(±):2 V ~ 12 V，±2 V ~ 6 V 电流 - 电源:50nA 工作温度:-40°C ~ 85°C 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:管件 |
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