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參數(shù)資料
| 型號： | ISL81387 |
| 廠商： | Intersil Corporation |
| 英文描述： | ±15kV ESD Protected, Dual Protocol (RS-232/RS-485) Transceivers(±15kV ESD保護(hù)，雙協(xié)議(RS-232/RS-485)收發(fā)器) |
| 中文描述： | ± 15kV的ESD保護(hù)，雙協(xié)議（RS-232/RS-485）收發(fā)器（± 15kV的ESD保護(hù)，雙協(xié)議（RS-232/RS-485）收發(fā)器） |
| 文件頁數(shù)： | 14/27頁 |
| 文件大?。?/td> | 1092K |
| 代理商： | ISL81387 |
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14
FN6201.1
December 20, 2005
ISLX1387 Advantages
These dual protocol ICs offer many parametric
improvements versus those offered on competing dual
protocol devices. Some of the major improvements are:
15kV Bus Pin ESD - Eases board level requirements;
2.7V Diff V
OUT
- Better Noise immunity and/or distance;
Full Failsafe RS-485 Rx - Eliminates bus biasing;
Selectable RS-485 Data Rate - Up to 20Mbps, or slew
rate limited for low EMI and fewer termination issues;
High RS-232 Data Rate - >460kbps
Lower Tx and Rx Skews - Wider, consistent bit widths;
Lower I
CC
- Max I
CC
is 2-4X lower than competition;
Flow-Thru Pinouts - Tx, Rx bus pins on one side/logic
pins on the other, for easy routing to connector/UART;
Smaller (SSOP and QFN) and Pb-free Packaging.
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
μ
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
to 7k
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 tri-statable via
the active high RXEN pin, when the IC is shutdown (SHDN;
see Tables 2 and 3, and the “Low Power Shutdown” section),
or via the active low RXEN pin available on the QFN package
option (see “ISL41387 Special Features” for more details).
Tx Features
RS-232 drivers invert and convert the standard TTL/CMOS
levels from a UART, or
μ
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 spec (4 to 30V/
μ
s) for a wide range of
load capacitances. Tx inputs float if left unconnected, and
may cause I
CC
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 via the active high DEN pin, in SHDN
(see Tables 2 and 3, and the “Low Power Shutdown”
section), or when the 5V power supply is off.
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 the port is configured for
RS-232 operation, and not in SHDN. The efficient design
requires only four small 0.1
μ
F 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 I
CC
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 is a dedicated RS-485 port, then the charge
pump capacitors aren’t even required.
Data Rates and Cabling
Drivers operate at data rates up to 650kbps, and are
guaranteed for data rates up to 460kbps. The charge pumps
and drivers are designed such that one driver can be
operated at the rated load, and at 460kbps (see Figure 33).
Figure 33 also shows that drivers can easily drive 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.
Figures 36
and 37 illustrate driver and receiver waveforms at
250kbps, and 500kbps, respectively. For these graphs, one
driver drives the specified capacitive load, and a receiver.
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 ISLX1387 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-485/422 port includes a single
receiver (RA), and the unused Rx output (RB) is disabled.
Worst case receiver input currents are 20% lower than the 1
“unit load” (1mA) RS-485 limit, which translates to a 15k
minimum input resistance.
ISL81387, ISL41387
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL81483 | 1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers(1/8 單位負(fù)載、5V、小功率、高速或帶有限斜率功能的RS-485/RS-422收發(fā)器) |
| ISL81487 | 1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers(1/8 單位負(fù)載、5V、小功率、高速或帶有限斜率功能的RS-485/RS-422收發(fā)器) |
| ISL8487 | 1/8 Unit Load, 5V, Low Power, High Speed or Slew Rate Limited, RS-485/RS-422 Transceivers(1/8 單位負(fù)載、5V、小功率、高速或帶有限斜率功能的RS-485/RS-422收發(fā)器) |
| ISL81485IU | 5V, 30Mbps, RS-485/RS-422 Transceiver |
| ISL81485IB | 5V, 30Mbps, RS-485/RS-422 Transceiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL81387_07 | 制造商:INTERSIL 制造商全稱: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 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| ISL81387IAZ-T | 功能描述:TXRX ESD RS-485/422 2PORT 20SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):1/1 規(guī)程:RS422，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 產(chǎn)品目錄頁面:1402 (CN2011-ZH PDF) |
| ISL81387IAZ-T7A | 功能描述:RS-422/RS-485 接口 IC SINGLE 5V MULTIPROTOCOL TRANS RoHS:否 制造商:Maxim Integrated 數(shù)據(jù)速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| ISL81387IBZ | 功能描述:TXRX ESD RS-485/422 2PORT 20SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:發(fā)射器 驅(qū)動(dòng)器/接收器數(shù):4/0 規(guī)程:RS422，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
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