Datasheet SP1481E Datasheet (Sipex)

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Page 1

查询SP1481E供应商

PRELIMINAR Y

±15kV Enhanced Low Power Half-Duple x

■ +5V supply

■ Low Power BiCMOS

■ Driver/Receiver Enable for Multi-Drop

configurations

■ Low Power Shutdown Mode (1µA Typical)

■ Available in 8 Pin NSOIC or PDIP packages (Standard 75176 pinout)

■ Enhanced ESD Specifications: +15KV Human Body Model +15KV IEC1000-4-2 Air Discharge +8KV IEC1000-4-2 Contact Discharge

SP1481E

RS-485 T ransceivers

2 3 4

SP1481E

8 Pin - nSOIC

6 5

GND

DESCRIPTION

The SP1481E is a half-duplex transceiver that meets the specifications of RS-485 and RS422 serial protocols with enhanced ESD performance. The ESD tolerance has been improved on this device to over +15KV for both Human Body Model and IEC1000-4-2 Air Discharge Method. This device is pin-to-pin compatible with Sipex's SP485 and SP481 devices as well as popular industry standards. As with the original version, the SP1481E features Sipex's BiCMOS design allowing low power operation without sacrificing performance. The SP1481E meets the requirements of the RS-485 and RS-422 protocols up to 20Mbps under load.

BLOCK DIAGRAM

RO 1 RE 2

DE 3

DI 4

SP1481E

8 Vcc 7 B

6 A

5 GND

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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............................................................................................................+7V

Input Voltages

Logic........................................................-0.3V to (VCC+0.5V)

Drivers..................................................-0.3V to (VCC+0.5V)

Receivers................................................................. ±15V

Output Voltages

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

Power Dissipation per Package 8-pin NSOIC (derate 6.60mW/ 8-pin PDIP (derate 11.8mW/

Logic........................................................-0.3V to (VCC+0.5V)

Drivers...................................................................... ±15V

Receivers............................................-0.3V to (VCC+0.5V)

C above +70oC)...........................550mW

C above +70oC)............................1000mW

ELECTRICAL CHARACTERISTICS

to T

and VCC = 5V ± 5% unless otherwise noted.

MIN

MAX

PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP1481E DRIVER

DC Characteristics

Differential Output Voltage 3.5 V Differential Output Voltage 2 V

Differential Output Voltage 1.5 V Change in Magnitude of Driver Differential Output Voltage for Complimentary States 0.2 Volts R = 27Ω or R = 50Ω; Driver Common-Mode Output Voltage 3 Volts R = 27Ω or R = 50Ω; 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 V

= HIGH ±250 mA -7V ≤ VO ≤ +12V

OUT

= LOW ±250 mA -7V ≤ VO ≤ +12V

OUT

SP1481E DRIVER AC Characteristics

Maximum Data Rate 20 Mbps RE = 5V, DE = 5V; R Driver Input to Output 10 30 40 ns t

10 ns t Driver Skew 3 ns Driver Rise or Fall Time 8 20 ns From 10% to 90%; R Driver Enable to Output High 40 70 ns CL = 100pF; Driver Enable to Output Low 40 70 ns CL = 100pF; Driver Disable Time from Low 40 70 ns CL = 100pF; Driver Disable Time from High 40 70 ns CL = 100pF;

closed

Volts Unloaded; R = ∞ ;

Volts with load; R = 50Ω; (RS-422);

Volts with load; R = 27Ω; (RS-485);

see Figure 1

CL1 = CL2 = 100pF

; R

PLH

see Figures 3 and 5

= 54Ω, CL1 = CL2 = 100pF;

DIFF

; R

PHL

= 54Ω, C

DIFF

see Figures 3 and 5,

= | t

SKEW

CL1 = C

DPLH

= 100pF;

closed closed closed

see Figures 4 & 6;

see Figure 1

see Figure 1 see Figure 1

= 54Ω,

DIFF

= CL2 = 100pF;

- t

DPHL

= 54Ω,

DIFF

ee Figures 3 &

see Figures 4 & 6; see Figures 4 & 6; see Figures 4 & 6;

Page 3

to T

and VCC = 5V ± 5% unless otherwise noted.

MIN

MAX

SPECIFICATIONS (continued)

PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS SP148

1E RECEIVER

DC Characteristics

Differential Input Threshold -0.2 +0.2 Volts -7V ≤ V Differential Input Threshold -0.4 +0.4 Volts -7V ≤ V (SP1485EMN ONLY) Input Hysteresis 20 mV V Output Voltage High 3.5 Volts I Output Voltage Low 0.4 Volts I Three-State (High Impedance)

= -4mA, VID = +200mV

= +4mA, VID = -200mV

Output Current ±1 µA 0.4V ≤ V Input Resistance 12 15 kΩ -7V ≤ V Input Current (A, B); VIN = 12V +1.0 mA DE = 0V, VCC = 0V or 5.25V, VIN = 12V Input Current (A, B); V Short-Circuit Current 7 95 mA 0V ≤ V

= -7V -0.8 mA DE = 0V, VCC = 0V or 5.25V, VIN = -7V

≤ +12V

= 0V

≤ 2.4V; RE = 5V

≤ +12V

≤ V

SP1481E RECEIVER AC Characteristics

Maximum Data Rate 20 Mbps RE = 0V, DE = 0V Receiver Input to Output 15 40 50 ns t

15 ns t

Diff. Receiver Skew It

I510nsR

PLH-tPHL

; R

DIFF

= 100pF;

; R

DIFF

= 54Ω; C

= 54Ω,

= 54Ω, C

PLH

CL1 = C

PHL

DIFF

Figures 3 & 7

= C

= CL2 = 100pF

= 100pF;

Receiver Enable to Output Low 45 70 ns CRL = 15pF;

Figures 2 & 8;

S1 closed Receiver Enable to Output High 45 70 ns CRL = 15pF; Receiver Disable from Low 45 70 ns CRL = 15pF; Receiver Disable from High 45 70 ns CRL = 15pF;

Figures 2 & 8;

Figures 2 & 8; Figures 2 & 8;

S2 closed

S1 closed

S2 closed

SP1481E Shutdown Timing

Time to Shutdown 50 200 600 ns RE = 5V, DE = 0V Driver Enable from Shutdown to Output High 40 100 ns CL = 100pF;

See Figures 4 & 6;

S2 closed Driver Enable from Shutdown to Output Low 40 100 ns CL = 100pF;

See Figures 4 & 6;

S1 closed Receiver Enable from Shutdown to Output High 300 1000 ns CL = 15pF;

See Figures 2 & 8;

S2 closed Receiver Enable from Shutdown to Output Low 300 1000 ns CL = 15pF;

See Figures 2 & 8;

S1 closed

POWER REQUIREMENTS

Supply Voltage +4.75 +5.25 Volts Supply Current

SP1481E

No Load 900 µA RE, DI = 0V or VCC; DE = V

600 µA RE = 0V, DI = 0V or 5V; DE = 0V

SHUTDOWN 10 µA

RE = 5V, DE = 0V

ENVIRONMENTAL AND MECHANICAL

Operating Temperature Commercial (_C_) 0 +70 °C Industrial (_E_) -40 +85 °C (_M_) -40 +125 °C Storage Temperature -65 +150 °C Package Plastic DIP (_P) NSOIC (_N)

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RO 1

RE 2

DE 3

DI 4

SP485

Top View

SP1485E

Pinout (Top View)

8 V

7 B

6 A

5 GND

PIN FUNCTION

Pin 1 – RO – Receiver Output. Pin 2 – RE – Receiver Output Enable Active LOW. Pin 3 – DE – Driver Output Enable Active HIGH. Pin 4 – DI – Driver Input. Pin 5 – GND – Ground Connection. Pin 6 – A – Driver Output/Receiver Input

Non-inverting. Pin 7 – B – Driver Output/Receiver Input Inverting.

Pin 8 – Vcc – Positive Supply 4.75V<Vcc< 5.25V.

+3V

f = 1MHz; tR < 1.0ns; tF < 1.0ns

DRIVER

OUTPUT

DIFFERENTIAL

OUTPUT

– V

SKEW = | tDPLH - tDPHL

Figure 5. Driver Propagation Delays

B A +

–

1/2V

1.5V 1.5V t

PLH

DPLH

PHL

DPHL

1/2V

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INPUTS OUTPUTS

LINE

RE DE DI CONDITION B A

X11No Fault 0 1 X10No Fault 1 0 X0X X ZZ X1X Fault Z Z

Table 1. Transmit Function Truth Table

INPUTS OUTPUTS

RE DE A - B R

00 +0.2V 1 00 -0.2V 0 00Inputs Open 1 10 X Z

Table 2. Receive Function Truth Table

+3V

1.5V 1.5V

0V 5V

A, B

Figure 6. Driver Enable and Disable Times

0D2

A – B

SKEW = | tPHL - tPLH

Figure 7. Receiver Propagation Delays

–

0D2

PHL

f = 1MHz; tR < 1.0ns; tF < 1.0ns

2.3V

0V 0V

Output normally LOW

Output normally HIGH

INPUT

1.5V 1.5V

f = 1MHz; tR < 1.0ns; tF < 1.0ns

OUTPUT

PLH

0.5V

+3V

1.5V 1.5V f = 1MHz; tR < 1.0ns; tF < 1.0ns

Figure 8. Receiver Enable and Disable Times

1.5V

Output normally LOW

Output normally HIGH

0.5V

0.5V t

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DESCRIPTION

The SP1481E is half-duplex differential transceivers that meet the requirements of RS-485 and RS-422. Fabricated with a Sipex proprietary BiCMOS process, this product requires a fraction of the power of older bipolar designs.

The RS-485 standard is ideal for multi-drop applications and for long-distance interfaces. RS-485 allows up to 32 drivers and 32 receivers to be connected to a data bus, making it an ideal choice for multi-drop applications. Since the cabling can be as long as 4,000 feet, RS-485 transceivers are equipped with a wide (-7V to +12V) common mode range to accommodate ground potential differences. Because RS-485 is a differential interface, data is virtually immune to noise in the transmission line.

Drivers

The driver outputs of the SP1481E are differential outputs meeting the RS-485 and RS-422 standards. The typical voltage output swing with no load will be 0 Volts to +5 Volts. With worst case loading of 54Ω across the differential outputs, the drivers can maintain greater than 1.5V voltage levels. The drivers of the SP1481E have an enable control line which is active HIGH. A logic HIGH on DE (pin 3) will enable the differential driver outputs. A logic LOW on DE (pin

3) will tri-state the driver outputs. The transmitters of the SP1481E will operate up

to at least 20Mbps.

Receivers

The SP1481E receivers have differential inputs with an input sensitivity as low as ±200mV. Input impedance of the receivers is typically 15kΩ (12kΩ minimum). A wide common mode range of -7V to +12V allows for large ground potential differences between systems. The receivers of the SP1485E have a tri-state enable control pin. A logic LOW on RE (pin 2) will enable the receiver, a logic HIGH on RE (pin 2) will disable the receiver.

The receiver for the SP1481E will operate up to at least 20Mbps. The receiver for each of the two devices is equipped with the

fail-safe feature. Fail-safe guarantees that the receiver output will be in a HIGH state when the input is left unconnected.

SHUTDOWN MODE

The SP1481E is equipped with a Shutdown mode. To enter the Shutdown state, both the driver and receiver must be disabled simultaneously. A logic LOW on DE (pin 3) and a logic HIGH on RE (pin 2) will put the SP1481E into Shutdown mode. In Shutdown, supply current will drop to typically 1µA.

ESD TOLERANCE

The SP1481E incorporates ruggedized ESD cells on all driver output and receiver input pins. The ESD structure is improved over our previous family for more rugged applications and environments sensitive to electro-static discharges and associated transients. The improved ESD tolerance is at least ±15kV without damage or latch-up.

There are different methods of ESD testing applied:

a) MIL-STD-883, Method 3015.7 b) IEC1000-4-2 Air-Discharge c) IEC1000-4-2 Direct Contact

The Human Body Model has been the generally accepted ESD testing method for semiconductors. This method is also specified in MIL-STD-883, Method 3015.7 for ESD testing. The premise of this ESD test is to simulate the human body’s potential to store electro-static energy and discharge it to an integrated circuit. The simulation is performed by using a test model as shown in Figure 7. This method will test the IC’s capability to withstand an ESD transient during normal handling such as in manufacturing areas where the ICs tend to be handled frequently.

The IEC-1000-4-2, formerly IEC801-2, is generally used for testing ESD on equipment and systems. For system manufacturers, they must guarantee a certain amount of ESD protection since the system itself is exposed to the outside environment and human presence. The premise with IEC1000-4-2 is that the system is required

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to withstand an amount of static electricity when ESD is applied to points and surfaces of the equipment that are accessible to personnel during normal usage. The transceiver IC receives most of the ESD current when the ESD source is applied to the connector pins. The test circuit for IEC1000-4-2 is shown on Figure 8. There are two methods within IEC1000-4-2, the Air Discharge method and the Contact Discharge method.

SW1

DC Power Source

Figure 7. ESD Test Circuit for Human Body Model

SW1

DC Power Source

SW2

Contact-Discharge Module

SW2

Device Under Test

and RV add up to 330Ω for IEC1000-4-2.

RS and RV add up to 330Ω for IEC1000-4-2.

Figure 8. ESD Test Circuit for IEC1000-4-2

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With the Air Discharge Method, an ESD voltage is applied to the equipment under test (EUT) through air. This simulates an electrically charged person ready to connect a cable onto the rear of the system only to find an unpleasant zap just before the person touches the back panel. The high energy potential on the person discharges through an arcing path to the rear panel of the system before he or she even touches the system. This energy, whether discharged directly or through air, is predominantly a function of the discharge current rather than the discharge voltage. Variables with an air discharge such as approach speed of the object carrying the ESD potential to the system and humidity will tend to change the discharge current. For example, the rise time of the discharge current varies with the approach speed.

i ➙

30A

15A

t=0ns t=30ns

t ➙

Figure 9. ESD Test Waveform for IEC1000-4-2

The Contact Discharge Method applies the ESD current directly to the EUT. This method was devised to reduce the unpredictability of the ESD arc. The discharge current rise time is constant since the energy is directly transferred

voltage stored in the capacitor is then applied through RS, the current limiting resistor, onto the device under test (DUT). In ESD tests, the SW2 switch is pulsed so that the device under test

receives a duration of voltage. without the air-gap arc. In situations such as hand held systems, the ESD charge can be directly discharged to the equipment from a person already holding the equipment. The current is transferred on to the keypad or the serial port of the equipment directly and then travels through the PCB and finally

For the Human Body Model, the current limiting

resistor (RS) and the source capacitor (CS) are

1.5kΩ an 100pF, respectively. For IEC-1000-4-

2, the current limiting resistor (RS) and the source

capacitor (CS) are 330Ω an 150pF, respectively. to the IC.

The higher CS value and lower RS value in the The circuit model in Figures 7 and 8 represent the typical ESD testing circuit used for all three methods. The CS is initially charged with the DC power supply when the first switch (SW1) is on. Now that the capacitor is charged, the second switch (SW2) is on while SW1 switches off. The

SP1481E,

HUMAN BODY IEC1000-4-2

SP1485E

MODEL Air Discharge Direct Contact Level

FAMILY

Driver Outputs ±15kV ±15kV ±8kV 4 Receiver Inputs ±15kV ±15kV ±8kV 4

IEC1000-4-2 model are more stringent than the

Human Body Model. The larger storage capacitor

injects a higher voltage to the test point when

SW2 is switched on. The lower current limiting

resistor increases the current charge onto the test

point.

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D1 = 0.005" min.

(0.127 min.)

e = 0.100 BSC

(2.540 BSC)

ALTERNATE

END PINS

(BOTH ENDS)

PACKAGE: PLASTIC

DUAL–IN–LINE (NARROW)

A1 = 0.015" min.

(0.381min.)

A = 0.210" max.

(5.334 max).

eA = 0.300 BSC

(7.620 BSC)

DIMENSIONS (Inches)

Minimum/Maximum

(mm) A2

8–PIN

0.115/0.195

(2.921/4.953)

0.014/0.022

(0.356/0.559)

0.045/0.070

(1.143/1.778)

0.008/0.014

(0.203/0.356)

0.355/0.400

(9.017/10.160)

0.300/0.325

(7.620/8.255)

0.240/0.280

(6.096/7.112)

0.115/0.150

(2.921/3.810)

0°/ 15°

(0°/15°)

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PACKAGE: 8 PIN NSOIC

E/2

INDEX AREA (D/2 X E1/2)

TOP VIEW

Minimum/Maximum

DIMENSIONS

(mm)

COMMON HEIGHT DIMENSION

SYMBOL MIN NOM MAX

A A1 A2 b c

1.35

0.10

1.25

0.31

0.17 0.25

E E1

e L

0.40

Ø Ø1

0º 5º

SIDE VIEW

8 Pin NSOIC

(JEDEC MS-012,

AA - VARIATION)

1.75

- 0.25

1.65

0.51

4.90 BSC

6.00 BSC

3.90 BSC

1.27 BSC

1.27

1.04 REF

0.25 BSC

8º

15º

E1/2

Ø1

Seating Plane

Ø1

SEE VIEW C

Gauge Plane

VIEW C

SEATING PLANE

WITH PLATING

BASE METAL

CONT ACT AREA

PACKAGE:

8 PIN NSOIC

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ORDERING INFORMATION

Model Temperature Range Package

SP1481ECN .....................................................0˚C to +70˚C............................................... 8-pin Narrow SOIC

SP1481ECP......................................................0˚C to +70˚C ................................................... 8-pin Plastic DIP

SP1481EEN.................................................... -40˚C to +85˚C ............................................. 8-pin Narrow SOIC

SP1481EEP.................................................... -40˚C to +85˚C .................................................8-pin Plastic DIP

SP1481EMN .................................................. -40˚C to +125˚C ............................................8-pin Narrow SOIC

Please consult the factory for pricing and availability on a Tape-On-Reel option.

REVISION HISTORY

DATE REVISION DESCRIPTION

02/09/04 A Production Release. 02/09/04 B Change SHUTDOWN typ. value to 10µA. Added min. values for driver

input to output and receiver input to output.

Corporation

ANALOG EXCELLENCE

Sipex Corporation Headquarters and

Sales Office

233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600

Sales Office

22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: [email protected]

Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.