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参数资料
| 型号： | ISL3241EIRZ-T |
| 厂商： | INTERSIL CORP |
| 元件分类： | Buffer和线驱动 |
| 英文描述： | QFN Packaged, ±15kV ESD Protected, +2.7V to +3.6V, 250kbps, RS-232 Transmitters/Receivers with Separate Logic Supply Pin; Temperature Range: -40°C to 85°C; Package: 32-QFN |
| 中文描述： | LINE TRANSCEIVER, PQCC32 |
| 封装： | 5 X 5 MM, ROHS COMPLIANT, PLASTIC, QFN-32 |
| 文件页数： | 4/16页 |
| 文件大小： | 549K |
| 代理商： | ISL3241EIRZ-T |
12
FN6768.1
May 13, 2010
transmitters power-down, thereby reducing supply current to
less than 1A. Invalid receiver levels occur whenever the
driving peripheral’s outputs are shut off (powered down) or
when the RS-232 interface cable is disconnected. The
ISL3243E powers back up whenever it detects a valid
RS-232 voltage level on any receiver input. This automatic
power-down feature provides additional system power
savings without changes to the existing operating system.
Automatic power-down operates when the FORCEON input
is low, and the FORCEOFF input is high. Tying FORCEON
high disables automatic power-down, but manual
power-down is always available via the overriding
FORCEOFF input. Table 2 summarizes the automatic
power-down functionality.
The time to recover from automatic power-down mode is
typically 20s.
Capacitor Selection
The charge pumps require 0.1F, or greater, capacitors for
proper operation. Increasing the capacitor values (by a
factor of 2) reduces ripple on the transmitter outputs and
slightly reduces power consumption.
When using minimum required capacitor values, make sure
that capacitor values do not degrade excessively with
temperature. If in doubt, use capacitors with a larger nominal
value. The capacitor’s equivalent series resistance (ESR)
usually rises at low temperatures and it influences the
amount of ripple on V+ and V-
.
Power Supply Decoupling
In most circumstances a 0.1F bypass capacitor is
adequate. In applications that are particularly sensitive to
power supply noise, decouple VCC and VL to ground with a
capacitor of the same value as the charge-pump capacitor C1.
Connect the bypass capacitor as close as possible to the IC.
Transmitter Outputs when Exiting
Power-down
Figure 12 shows the response of two transmitter outputs
when exiting powerdown mode. As they activate, the two
transmitter outputs properly go to opposite RS-232 levels,
with no glitching, ringing, nor undesirable transients. Each
transmitter is loaded with 3k
Ω in parallel with 1000pF. Note
that the transmitters enable only when the magnitude of V+
and V- exceeds approximately 3V.
Operation Down to 2.7V
ISL324xE transmitter outputs meet RS-562 levels (±3.7V), at
the full data rate, with VCC as low as 2.7V. RS-562 levels
typically ensure inter operability with RS-232 devices.
High Data Rates
The ISL324xE maintain the RS-232 ±5V minimum
transmitter output voltages even at high data rates.
Figure 13 details a transmitter loopback test circuit, and
Figure 14 illustrates the loopback test result at 120kbps. For
this test, all transmitters were simultaneously driving RS-232
loads in parallel with 1000pF, at 120kbps. Figure 15 shows
the loopback results for a single transmitter driving 1000pF
and an RS-232 load at 250kbps. The static transmitters were
also loaded with an RS-232 receiver.
FIGURE 13. TRANSMITTER LOOPBACK TEST CIRCUIT
TIME (20s/DIV.)
T1
T2
2V/DIV.
5V/DIV.
VCC = +3.3V, VL = 1.8V
FORCEOFF
FIGURE 12. TRANSMITTER OUTPUTS WHEN EXITING
POWERDOWN
C1 TO C4 = 0.1F
ISL324xE
VL
FORCEOFF OR SHDN
C1
C2
C4
C3
+
1000pF
V+
V-
5k
Ω
TIN
ROUT
C1+
C1-
C2+
C2-
RIN
TOUT
+
VCC
0.1F
VCC
FORCEON
VL
+
0.1F
VL
EN
ISL3241E, ISL3243E
相关PDF资料 |
PDF描述 |
|---|---|
| ISL3243EIRZ | QFN Packaged, ±15kV ESD Protected, +2.7V to +3.6V, 250kbps, RS-232 Transmitters/Receivers with Separate Logic Supply Pin; Temperature Range: -40°C to 85°C; Package: 32-QFN |
| ISL3243EIRZ-T | QFN Packaged, ±15kV ESD Protected, +2.7V to +3.6V, 250kbps, RS-232 Transmitters/Receivers with Separate Logic Supply Pin; Temperature Range: -40°C to 85°C; Package: 32-QFN |
| ISL3293EFHZ-T | ±16.5kV ESD Protected, +125°C, 3.0V to 5.5V, SOT-23/TDFN Packaged, Low Power, RS-485/RS-422 Transmitters; Temperature Range: Full-Range Ind; Package: 6-SOT-23 T&R |
| ISL3293EIHZ-T | ±16.5kV ESD Protected, +125°C, 3.0V to 5.5V, SOT-23/TDFN Packaged, Low Power, RS-485/RS-422 Transmitters; Temperature Range: -40°C to 85°C; Package: 6-SOT-23 T&R |
| ISL3294EFHZ-T | ±16.5kV ESD Protected, +125°C, 3.0V to 5.5V, SOT-23/TDFN Packaged, Low Power, RS-485/RS-422 Transmitters; Temperature Range: Full-Range Ind; Package: 6-SOT-23 T&R |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ISL32430EIUZ | 功能描述:IC TRANSCEIVER 10-MSOP 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) |
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