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Operates From A Single +3.3V Supply

? Interoperable With +5.0V Logic

? +/-200mV Receiver Input Sensitivity

? -7V to +12V Common-Mode Input Voltage Range

? Allows Up To 32 transceivers On The Serial Bus

? Driver/Receiver Enable Lines

? 10μA Low-Power Shutdown Mode

? Compatibility with the MAX3486 and_75176 Industry

Standard Pinout

SP3494

+3.3V Low Power

RS-485/RS-422 Transceiver

The SP3494 device is a +3.3V low power half-duplex transceiver that meets the specifications

of the RS-485 and_RS-422 serial protocols. This device is pin-to-pin compatible with the Exar

SP3481 device as well as other popular industry standards. The SP3494 features the Exar

BiCMOS process， allowing low power operation without sacrificing performance. The partially

slew-rate limited drivers minimize EMI and_reduce reflections caused by improperly terminated

cables allowing error-free data transmission.The SP3494 is a half-duplex partially slew-rate

limited transceiver that will deliver a data transmission rate up to 2.5Mbps. The SP3494 is

equipped with a low-power shutdown mode and_driver/receiver high-Z enable lines.

Exar Corporation 48720 Kato Road， Fremont CA， 94538 ? 510-668-7017 ? www.exar.com SP3494_100_071012

ABSOLUTE MAXIMUM RATINGS

These are stress ratings only and_functional operation

of the device at these ratings or any other above those

indicated in the operation sections of the specifications

below is not implied. Exposure to absolute maximum

rating conditions for extended periods of time may

affect reliability.

VCC.....................................................................+6.0V

Input Voltages

Drivers.................................-0.3V to +6.0V

Receivers.........................................+/-14V

Output Voltages

Drivers.............................................+/-14V

Receivers............................-0.3V to +6.0V

Storage Temperature.......................-65?C to +150?C

Power Dissipation

8-pin NSOIC...................................................600mW

(derate 6.90mW/oC above +70oC)

ELECTRICAL CHARACTERISTICS TAMB = TMIN to TMAX and_VCC = +3.3V +/-5%_unless otherwise noted.

PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS

SP3494 DRIVER

DC Characteristics

Differential Output Voltage GND Vcc Volts Unloaded;_R = ∞? ;_Figure 1

Differential Output Voltage 2 Vcc Volts With Load;_R = 50? (RS-422);_

Figure 1

Differential Output Voltage 1.5 Vcc Volts With Load;_R = 27? (RS-485);_

Figure 1

Change in Magnitude of Driver

Differential Output Voltage for

Complimentary states

0.2 Volts R = 27? or R = 50?;_Figure 1

Driver Common-Mode Output

Voltage

3 Volts R = 27? or R = 50?;_Figure 1

Input High Voltage 2.0 Volts Applies to DE， DI， RE

Input Low Voltage 0.8 Volts Applies to DE， DI， RE

Input Current +/-10 μA Applies to DE， DI， RE

Driver Short Circuit Current

VOUT = HIGH

+/-250 mA -7V ≤ VO ≤ +12V;_Figure 8

Driver Short Circuit Current

VOUT = LOW

+/-250 mA -7V ≤ VO ≤ +12V;_Figure 8

SP3494 DRIVER

AC Characteristics

Maximum Data Rate 2.5 Mbps RE = VCC， DE = VCC

Driver Input to Output， tPLH 20 45 75 ns Figures 2 & 9

Driver Input to Output， tPHL 20 45 75 ns Figures 2 & 9

Differential Driver Skew 10 ns |tDO1

- tDO2|， Figures 2 and_10

Driver Rise or Fall Time 30 70 ns From 10%-90%;_Figures 3 and_10

Exar Corporation 48720 Kato Road， Fremont CA， 94538 ? 510-668-7017 ? www.exar.com SP3494_100_071012

PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS

SP3494 DRIVER AC Characteristics continued

Driver Enable to Output High 52 120 ns Figures 4 and_11

Driver Enable to Output Low 60 120 ns Figures 5 and_11

Driver Disable Time from Low 40 120 ns Figures 5 and_11

Driver Disable Time from High 60 120 ns Figures 4 and_11

SP3494 RECEIVER

DC Characteristics

Differential Input Threshold -0.2 +0.2 Volts -7V ≤ VCM ≤ +12V

Input Hysteresis 20 mV VCM = 0V

Output Voltage HIGH Vcc-0.4 Volts VID = +200mV， -1.5mA

Output Voltage LOW 0.4 Volts VID = -200mV， 2.5mA

Three-State (High Impedance)

Output Current

+/-1 μA 0V ≤ VO ≤ VCC;_RE = VCC

Input Resistance 12 15 k? -7V ≤ VCM ≤ +12V

Input Current (A， B);_VIN = 12V +1.0 mA DE = 0V， VCC = 0V or 3.6V，

VIN = 12V

Input Current (A， B);_VIN = -7V -0.8 mA DE = 0V， VCC = 0V or 3.6V，

VIN = -7V

Short Circuit Current 7 60 mA 0V ≤ VCM ≤ VCC

SP3485 RECEIVER

AC Characteristics

Maximum Data Rate 2.5 Mbps RE = 0V， DE = 0V

Receiver Input to Output， tPLH 40 70 100 ns Figures 6 and_12

Receiver Input to Output， tPHL 40 70 100 ns Figures 6 and_12

Differential Receiver Skew 10 ns tRSKEW = |tRPHL- tRPLH|，

Figures 6 and_12

Receiver Enable to Output Low 35 60 ns Figures 7 and_13，

S1

closed， S2

open

Receiver Enable to Output High 35 60 ns Figures 7 and_13，

S2

closed， S1

open

Receiver Disable from Low 35 60 ns Figures 7 and_13，

S1

closed， S2

open

Receiver Disable from High 35 60 ns Figures 7 and_13，

S2

closed， S1

open 在半导体景气停滞，化学、建设产业也萎靡不振的背景下，第一季(1～3月)韩国企业营收时隔两年半衰退。

由于越来越担忧中美贸易战升级所带来的负面影响，存储芯片巨头SK海力士正在放慢其在中国工厂生产的步伐。

SK海力士花费9500亿韩元在两年多的时间里建造了这座工厂，这是自2006年以来运行的现有C2存储芯片设施的补充。

它的目标是推出基于更精细制造技术的DRAM芯片。

一位不愿透露姓名的业内人士表示:“由于市场环境不利，这座工厂全面加速的时间表被推迟了。

”这暗示，推迟时间与华为等中国合作伙伴的存储芯片需求下降相符。

SK海力士去年在中国的销售额为15.8万亿韩元，占其总收入的近40%，特别是华为，占了12%。

市场研究公司DRAMeXchange预计，DRAM价格将在第三季下跌15%，比之前的估计低5个百分点。

此外，一些全球和韩国本土市场分析师还预测，今年下半年芯片价格将下跌，预计这家去年营业利润达到20.9万亿韩元的韩国芯片公司今年第四季度可能会出现亏损。

“SK海力士一直在用DRAM业务的利润来弥补NAND闪存业务带来的损失，”Meritz分析师Kim Sun-woo表示，“而现在它将无法应对第四季度的损失。”

据韩媒《news1》报导，韩国银行(韩国中央银行)从韩国1万7200个企业中挑选3333个指标企业进行分析，韩国企业第1季营收比前一季少2.4%，这是两年半以来首次出现衰退。

制造业不振是整体营收减少的主因，韩国第1季制造业营收和前一季相比减少3.7%，是2016年第3季(-6.1%)后首次出现衰退

。而包含半导体产业的机械与电器电子类营收下降9%，是韩国有史以来下滑幅度最大的一次。