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參數(shù)資料
| 型號： | SP3078EMN-L/TR |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX RS485/RS422 ESD 8NSOIC |
| 標準包裝： | 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： | 3.3V |
| 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) |
5
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP3070E-SP3078E_02_2020
ESD structures withstand high ESD in all
states: normal operation, shutdown, and
powered down. After an ESD event, the
SP3070E - SP3078E keep working without
latchup or damage.
ESDprotectioncanbetestedinvariousways.
Thetransmitteroutputsandreceiverinputsof
the SP3070E - SP3078E are characterized
for protection to the following limits:
■ ±5kV using the Human Body Model
■ ±8kVusingtheContactDischargemethod
specified in IEC 61000-4-2
■ ±5kV Airgap
ESD TEST CONDITIONS
ESD performance depends on a variety
of conditions. Contact Exar for a reliability
report that documents test setup, methodol-
ogy and results.
IEC 61000-4-2
The IEC 6000-4-2 standard covers ESD
testing and performance of finished equip-
ment. However, it does not specifically refer
to integrated circuits. The SP3070E family
of devices helps you design equipment to
meet IEC 6000-4-2, without the need for
additional ESD-protection components.
The air-gap test involves approaching the
device with a charged probe. The contact-
discharge method connects the probe to the
device 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.
DETAILED DESCRIPTION
256 TRaNSCEIVERS ON THE BuS
The standard RS-485 receiver input imped-
ance is 12k (1 unit load), and the standard
driver can drive up to 32 unit loads. The
SP3070E family of transceivers has a /8-
unit load receiver input impedance (96k),
allowing up to 256 transceivers to be con-
nected in parallel on one communication
line. Any combination of these devices as
well as other RS-485 transceivers with a
total of 32 unit loads or fewer can be con-
nected to the line.
REDuCED EMI aND REFlECTIONS
The SP3070E, SP307E and SP3072E
feature reduced slew-rate drivers that mini-
mize EMI and reduce reflections caused by
improperly terminated cables, allowing er-
ror-free data transmission up to 250kbps.
TheSP3073E,SP3074EandSP3075Eoffer
higherdriveroutputslew-ratelimits,allowing
transmit speeds up to 500kbps.
lOW POWER SHuTDOWN MODE
Low-power shutdown mode is initiated by
bringing both RE high and DE low. In shut-
down, the devices typically draw only 50nA
of supply current.
RE and DE can be driven simultaneously;
the parts are guaranteed not to enter shut-
down 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 guaranteed to
enter shutdown.
Enable times t
ZH and tZL assume the part was
not in a low-power shutdown state. Enable
times t
ZH(SHDN) and tZL(SHDN) assume the parts
wereshutdown.Ittakesdriversandreceivers
longer to become enabled from low-power
shutdownmodet
ZH(SHDN) and tZL(SHDN) than from
driver/receiver-disable mode (t
ZH, tZL)
DRIVER OuTPuT PROTECTION
Two mechanisms prevent excessive output
current and power dissipation caused by
faults or by bus contention. First, current
limit on the ouput stage, provides immedi-
ate protection against short circuits over the
whole common-mode voltage range.
The major difference between tests done
using the Human Body Model and IEC
6000-4-2 is higher peak current in IEC
6000-4-2, because series resistance is
lower in the IEC 000-4-2 model. Hence,
the ESD withstand voltage measured to
EC 6000-4-2 is generally lower than that
measured using the human body model.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP3079 | 制造商: 功能描述: 制造商:undefined 功能描述: |
| SP3080E | 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 |
| SP3080E-3088E | 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 |
| SP3080EEN | 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 |
| SP3080EEN/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Advanced-Failsafe RS-485/RS-422 Transceiver 1/8th Unit Load, Slew-Limited, 【15kV ESD-Protected |
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