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| 型号： | ISL81334IAZ-T |
| 厂商： | Intersil |
| 文件页数： | 10/28页 |
| 文件大小： | 0K |
| 描述： | TXRX ESD RS-485/422 2PORT 28SSOP |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 1 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 2/2 |
| 规程： | RS232，RS422，RS485 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 标准包装 |
| 产品目录页面： | 1241 (CN2011-ZH PDF) |
| 其它名称： | ISL81334IAZ-TDKR |
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18
FN6202.3
November 21, 2007
the logic device’s low VOH might not exceed the VIH of a 5V
powered dual protocol input. Connecting the VL pin to the
power supply of the logic device (as shown in Figure 12)
and reduces the Tx and control input switching points to
values compatible with the logic device output levels.
Tailoring the logic pin input switching points and output levels
to the supply voltage of the UART, ASIC, or controller
eliminates the need for a level shifter/translator between the
two ICs.
VL can be anywhere from VCC down to 1.65V, but the input
switching points may not provide enough noise margin when
various VL values so the user can ascertain whether or not a
particular VL voltage meets his needs.
The VL supply current (IL) is typically less than 100A, as
to inputs with internal pull-up resistors (DE, SP, LB, ON/OFF)
being driven to the low input state. The worst case IL current
the ON/OFF pin pull-up resistor when that pin is driven low.
IIL through an input pull-up resistor is ~20A, so the IL in
SP inputs are high (middle vs top curve). IL is lowest in the
RS-232 mode, because only the ON/OFF pin should be
driven low. When all these inputs are driven high, IL drops to
<1A, so to minimize power dissipation drive these inputs
high when unneeded (e.g., SP inputs aren’t used in RS-232
mode, so drive them high).
Active Low Rx Enable (RXEN)
In many RS-485 applications, especially half duplex
configurations, users like to accomplish “echo cancellation”
by disabling the corresponding receiver while its driver is
transmitting data. This function is available on the QFN
package via an active low RXEN pin for each port. The
active low function also simplifies direction control, by
allowing a single Tx/Rx direction control line. If an active high
RXEN were used, either two valuable I/O pins would be
used for direction control, or an external inverter is required
between DE and RXEN. Figure 13 details the advantage of
using the RXEN pin.
TABLE 5. VIH AND VIL vs VL FOR VCC = 5V
VL (V)
VIH (V)
VIL (V)
1.65V
0.79
0.50
1.8V
0.82
0.60
2.0V
0.87
0.69
2.5V
0.99
0.86
3.3V
1.19
1.05
FIGURE 12. USING VL PIN TO ADJUST LOGIC LEVELS
GND
RXD
TXD
VCC = +2V
UART/PROCESSOR
GND
RA
DY
VCC = +5V
ISL81334
VOH ≤ 2V
VOH = 5V
VIH ≥ 2V
ESD
DIODE
GND
RXD
TXD
VCC = +2V
UART/PROCESSOR
GND
RA
DY
VCC = +5V
ISL41334
VOH ≤ 2V
VOH = 2V
VIH = 0.9V
ESD
DIODE
VL
FIGURE 13. USING ACTIVE LOW vs ACTIVE HIGH RX
ENABLE
0.1F
+
D
R
VCC
GND
RA
RXEN
DEN
DY
+5V
ISL81387
Tx/Rx
ACTIVE HIGH RX ENABLE
0.1F
+
D
R
VCC
GND
RA
RXEN *
DE
DY
+5V
ISL41334
Tx/Rx
* QFN ONLY
ACTIVE LOW RX ENABLE
Y
Z
A
B
Y
Z
A
B
ISL81334, ISL41334
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL81334IBZ | 功能描述:RS-422/RS-485 接口 IC W/ANNEAL SINGLE 5V MULTIPROTOCOL TRANSC 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 |
| ISL81334IBZ-T | 功能描述:TXRX ESD RS-485/422 2PORT 28SOIC 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) |
| ISL81387 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:【15kV ESD Protected, 5V, Dual Protocol (RS-232/RS-485) Transceivers |
| ISL81387_07 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:【15kV ESD Protected, 5V, Dual Protocol (RS-232/RS-485) Transceivers |
| ISL81387IAZ | 功能描述:RS-422/RS-485 接口 IC W/ANNEAL SINGLE 5V MULTIPROTOCOL TRANSC 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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