- 您现在的位置：买卖IC网 > PDF目录10679 > ISL41334IRZ-T (Intersil)TRANSISTOR ESD SGL/DUAL 40-QFN PDF资料下载
参数资料
| 型号： | ISL41334IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 7/28页 |
| 文件大小： | 0K |
| 描述： | TRANSISTOR ESD SGL/DUAL 40-QFN |
| 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： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN 裸露焊盘（6x6） |
| 包装： | 标准包装 |
| 产品目录页面： | 1241 (CN2011-ZH PDF) |
| 其它名称： | ISL41334IRZ-TDKR |
第1页第2页第3页第4页第5页第6页当前第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页
15
FN6202.3
November 21, 2007
RS-232 Mode
RX FEATURES
RS-232 receivers invert and convert RS-232 input levels
(±3V to ±25V) to the standard TTL/CMOS levels required by
a UART, ASIC, or controller serial port. Receivers are
designed to operate at faster data rates than the drivers, and
they feature very low skews (10ns) so the receivers
contribute negligibly to bit width distortion. Inputs include the
standards required 3k
Ω to 7kΩ pulldown resistor, so unused
inputs may be left unconnected. Rx inputs also have built-in
hysteresis to increase noise immunity, and to decrease
erroneous triggering due to slowly transitioning input signals.
Rx outputs are short circuit protected, and are only tri-statable
when the entire IC is shutdown via the ON/OFF pin, or via the
active low RXEN pin available on the QFN package option
for more details).
TX FEATURES
RS-232 drivers invert and convert the standard TTL/CMOS
levels from a UART, or controller serial port to RS-232
compliant levels (±5V minimum). The Tx delivers these
compliant output levels even at data rates of 650kbps, and
with loads of 1000pF. The drivers are designed for low skew
(typically 12% of the 500kbps bit width), and are compliant to
the RS-232 slew rate specification (4V/s to 30V/s) for a
wide range of load capacitances. Tx inputs float if left
unconnected, and may cause ICC increases. For the best
results, connect unused inputs to GND.
Tx outputs are short circuit protected, and incorporate a
thermal SHDN feature to protect the IC in situations of
severe power dissipation. See the RS-485 section for more
details. Drivers tri-state only in SHDN, or when the 5V power
supply is off. The SHDN function is useful for tri-stating the
outputs if both ports will always be tri-stated together (e.g.,
used as a four transceiver RS-232 port), and if it is
acceptable for the Rx to be disabled as well. A single port Tx
disable can be accomplished by switching the port to
RS-485 mode, and then using the corresponding DE pin to
tri-state the drivers. Of course, the Rx is now an RS-485 Rx,
so this option is feasible only if the Rx aren’t needed when
the Tx are disabled.
CHARGE PUMPS
The on-chip charge pumps create the RS-232 transmitter
power supplies (typically +6/-7V) from a single supply as low
as 4.5V, and are enabled only if either port is configured for
RS-232 operation. The efficient design requires only four
small 0.1F capacitors for the voltage doubler and inverter
functions. By operating discontinuously (i.e., turning off as
soon as V+ and V- pump up to the nominal values), the
charge pump contribution to RS-232 mode ICC is reduced
significantly. Unlike competing devices that require the
charge pump in RS-485 mode, disabling the charge pump
saves power, and minimizes noise. If the application keeps
both ports in RS-485 mode (e.g., a dedicated dual channel
RS-485 interface), then the charge pump capacitors aren’t
even required.
DATA RATES AND CABLING
Drivers operate at data rates of up to 650kbps, and are
guaranteed for data rates of up to 460kbps. The charge
pumps and drivers are designed such that one driver in each
port can be operated at the rated load, and at 460kbps (see
several thousands of picofarads at data rates up to 250kbps,
while still delivering compliant ±5V output levels.
Receivers operate at data rates up to 2Mbps. They are
designed for a higher data rate to facilitate faster factory
downloading of software into the final product, thereby
improving the user’s manufacturing throughput.
250kbps, and 500kbps, respectively. For these graphs, one
driver of each port drives the specified capacitive load, and a
receiver in the port.
RS-232 doesn’t require anything special for cabling; just a
single bus wire per transmitter and receiver, and another
wire for GND. So an ISL81334, ISL41334 RS-232 port uses
a five conductor cable for interconnection. Bus terminations
are not required, nor allowed, by the RS-232 standard.
RS-485 Mode
RX FEATURES
RS-485 receivers convert differential input signals as small
as 200mV, as required by the RS-485 and RS-422
standards, to TTL/CMOS output levels. The differential Rx
provides maximum sensitivity, noise immunity, and common
mode rejection. Per the RS-485 standard, receiver inputs
function with common mode voltages as great as ±7V
outside the power supplies (i.e., +12V and -7V), making
them ideal for long networks where induced voltages are a
realistic concern. Each RS-485, RS-422 port includes a
single receiver (RA), and the unused Rx output (RB) is
disabled, but pulled high by an internal current source. The
internal current source turns off in SHDN.
Worst case receiver input currents are 20% lower than the
1 “unit load” (1mA) RS-485 limit, which translates to a 15k
Ω
minimum input resistance.
These receivers include a “full fail-safe” function that
guarantees a high level receiver output if the receiver inputs
are unconnected (floating), shorted together, or if the bus is
terminated but undriven (i.e., differential voltage collapses to
near zero due to termination). Failsafe with shorted, or
terminated and undriven inputs is accomplished by setting
the Rx upper switching point at -40mV, thereby ensuring that
the Rx recognizes a 0V differential as a high level.
All the Rx outputs are short circuit protected, and are tri-state
when the IC is forced into SHDN, but ISL81334 (SOIC and
ISL81334, ISL41334
相关PDF资料 |
PDF描述 |
|---|---|
| LT1721IS | IC COMP R-RINOUT QUAD 16-SOIC |
| LT1721CGN#TRPBF | IC COMP R-RINOUT QUAD 16-SSOP |
| 85100JC1210PZ50 | CONN RCPT WALL MT 10POS W/PIN |
| LT1016IN8#PBF | IC COMPARATOR 10NS HI-SPEED 8DIP |
| VI-J2Y-MY-F3 | CONVERTER MOD DC/DC 3.3V 33W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL41334IRZ-T7A | 功能描述:IC TXRX RS232/485 DL 2PRT 40QFN 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) |
| ISL41387 | 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 |
| ISL41387EVAL1Z | 功能描述:EVALUATION BOARD FOR ISL41387 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:PCI Express® (PCIe) 主要目的:接口，收发器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要属性:- 次要属性:- 已供物品:板 |
| ISL41387IRZ | 功能描述:IC TXRX DUAL PROTOCAL ESD 40-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: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) |
| ISL41387IRZ-T | 功能描述:IC TXRX DUAL PROTOCAL ESD 40-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: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) |
发布紧急采购，3分钟左右您将得到回复。