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| 型號： | SP3085EEN-L/TR |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 15/26頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS485/RS422 ESD 8NSOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS422/RS485 |
| 電源電壓： | 5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOICN |
| 包裝： | 帶卷 (TR) |
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP3080E-SP3088E_0_0826
22
DESCRIPTION
the SP3080E - SP3088E are characterized for
protection to the following limits:
±5kV using the Human Body Model
±8kV using the Contact Discharge
method specified in IEC 61000-4-2
±5kV Air-gap
ESD TEST CONDITIONS
ESD performance depends on a variety of
conditions. Contact Exar for a reliability report
that documents test setup, methodology and
results.
IEC 61000-4-2
The IEC 6000-4-2 standard covers ESD test-
ing and performance of finished equipment.
However, it does not specifically refer to inte-
grated circuits. The SP3080E family helps you
design equipment to meet IEC 61000-4-2, with-
out sacrificing board space and cost for exter-
nal ESD-protection components.
The major difference between tests done using
the Human Body Model and IEC 6000-4-2 is
a higher peak current in IEC 6000-4-2 series
resistance is lower in the IEC 6000-4-2 model.
Hence, the ESD withstand voltage measured
to IEC 6000-4-2 is generally lower than that
measured using the human body model.
The air-gap test involves approaching the de-
vice with a charged probe. The contact dis-
charge method connects the probe to the de-
vice before the probe is energized.
MACHINE MODEL
The machine model for ESD tests all pins using
a 200pF storage capacitor and zero discharge
resistance. The objective is to emulate the
stress caused when I/O pins are contacted by
handling equipment during test and assembly.
256 TRANSCEIVERS ON THE BUS
The standard RS-485 receiver input impedance
is 12kΩ (1 unit load). A standard driver can
drive up to 32 unit loads. The SP3080E fam-
ily of transceivers has only a /8th unit load re-
ceiver input impedance (96kΩ), thereby allow-
ing eight times as many, up to 256, transceivers
to be connected in parallel on a communication
line. Any combination of these devices and oth-
er RS-485 transceivers up to a total of 32 unit
loads may be connected to the line.
LOW POWER SHUTDOWN MODE
Low-power shutdown mode is initiated by bring-
ing both RE high and DE low simultaneously.
While in shutdown devices typically draw only
50nA of supply current. DE and RE may be tied
together and driven by a single control signal.
Devices are guaranteed not to enter shutdown
if RE is high and DE is low for less than 50ns. If
the inputs are in this state for at least 600ns, the
parts are shutdown.
Enable times tZH and tZL apply when the part is
not in low-power shutdown state. Enable times
tZH(SHDN) and tZL(SHDN) apply when the parts
are shut down. The drivers and receivers take
longer to become enabled from low power shut-
down mode tZL(SHDN) and tZL(SHDN) than from
driver/receiver-disable mode (tZH, tZL).
DRIVER OUTPUT PROTECTION
Two mechanisms prevent excessive output cur-
rent and power dissipation caused by faults or
by bus contention. First, a driver-current limit
on the output stage provides immediate protec-
tion against short circuits over the whole com-
mon-mode voltage range. Second, a thermal-
shutdown circuit forces the driver outputs into
a high-impedance state if junction temperature
becomes excessive.
LINE LENGTH, EMI, AND REFLECTIONS
SP3080E - SP3085E feature controlled slew-
rate drivers that minimize EMI and reduce reflec-
tions caused by improperly terminated cables.
SP3080E - SP3083E driver rise and fall times
are limited to no faster than 667ns, allowing er-
ror-free data transmission up to 5kbps. The
SP3083E, SP3084E and SP3085E offer some-
what higher driver output slew-rate limits, allow-
ing transmit speeds up to 500kbps.
The RS-485/RS-422 standard covers line
lengths up to 4,000ft. Maximum achievable
line length is a function of signal attenuation
and noise. Use of slew-controlled drivers such
as the SP3080E-SP3086E may help to reduce
crosstalk interference and permit communica-
tion over longer transmission lines.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP3085EMN-L | 功能描述:RS-422/RS-485 接口 IC RS485/RS422 Driver/ Receiver Transceiver 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 |
| SP3085EMN-L/TR | 功能描述:RS-422/RS-485 接口 IC RS485/RS422 Driver/ Receiver Transceiver 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 |
| SP3086E | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Advanced-Failsafe RS-485/RS-422 Transceivers 1/8th Unit Load, Slew-Rate Limited, 【15kV ESD-Protected |
| SP3086EEN | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Advanced-Failsafe RS-485/RS-422 Transceivers 1/8th Unit Load, Slew-Rate Limited, 【15kV ESD-Protected |
| SP3086EEN-L | 功能描述:RS-422/RS-485 接口 IC RS485/RS422 Driver/ Receiver Transceiver 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 |
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