SP491EEN-L/TR - Sipex Corporation

Now available in Lead Free

SP490E/SP491E

Enhanced Full Duplex RS-485 Transceivers

■+5V Only

■Low Power BiCMOS

■Driver/Receiver Enable (SP491E)

■RS-485 and RS-422 Drivers/Receivers

■Pin Compatible with LTC490 and

SN75179 (SP490E)

■Pin Compatible with LTC491 and

SN75180 (SP491E)

■Improved ESD Specifications:

±15kV Human Body Model

±15kV IEC1000-4-2 Air Discharge

±8kV IEC1000-4-2 Contact Discharge

DESCRIPTION…

The SP490E is a low power differential line driver/receiver meeting RS-485 and RS-422

standards up to 10Mbps. The SP491E is identical to the SP490E with the addition of driver

and receiver tri-state enable lines. Both products feature ±200mV receiver input sensitivity,

over wide common mode range. The SP490E is available in 8-pin plastic DIP and 8-pin NSOIC

packages for operation over the commercial and industrial temperature ranges. The SP491E

is available in 14-pin DIP and 14-pin NSOIC packages for operation over the commercial and

industrial temperature ranges.

Vcc

GND

REB

GND

Vcc

GND

SP490E SP491E

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

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

Receivers..................................................................±14V

Output Voltages

Drivers......................................................................±14V

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

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

Power Dissipation.....................................................................1000mW

SPECIFICATIONS

TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.

PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS

SP490E DRIVER

DC Characteristics

Differential Output Voltage GND VCC Volts Unloaded; R = ∞;

see Figure 1

Differential Output Voltage 2 VCC Volts With Load; R = 50Ω; (RS-422);

see Figure 1

Differential Output Voltage 1.5 VCC Volts W

ith Load; R = 27Ω; (RS-485);

see Figure 1

Change in Magnitude of Driver

Differential Output Voltage for

Complimentary States 0.2 Volts R = 27Ω or R = 50Ω;

see Figure 1

Driver Common-Mode

Output Voltage 3 Volts R = 27Ω or R = 50Ω;

see Figure 1

Input High Voltage 2.0 Volts Applies to D

Input Low Voltage 0.8 Volts Applies to D

Input Current ±10 µA Applies to D

Driver Short-Circuit Current

VOUT = HIGH ±250 mA -7V ≤ VO ≤ +12V

VOUT = LOW ±250 mA -7V ≤ VO ≤ +12V

SP490E DRIVER

AC Characteristics

Maximum Data Rate 10 Mbps RDIFF = 54Ω, CL1 = CL2 = 100pF

Driver Input to Output 20 30 60 ns tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF;

see Figures 3 and 6

Driver Input to Output 20 30 60 ns tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF;

see Figures 3 and 5

Driver Skew 5 ns

see Figures 3 and 5,

tSKEW = | tDPLH - tDPHL|

Driver Rise or Fall Time 3 15 40 ns From 10% to 90%; RDIFF = 54Ω,

= C

= 100pF;

see Figures 3 and 5

SP490E

RECEIVER

DC Characteristics

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

Input Hysteresis 70 mV VCM = 0V

Output Voltage High 3.5 Volts IO = -4mA, VID = +200mV

Output Voltage Low 0.4 Volts IO = +4mA, VID = -200mV

Input Resistance 12 15 kΩ-7V ≤ VCM ≤ 12V

Input Current (A, B); VIN = 12V ±1.0 mA VIN = 12V

Input Current (A, B); VIN = -7V -0.8 mA VIN = -7V

Short-Circuit Current 85 mA 0V ≤ VO ≤ VCC

SPECIFICATIONS (continued)

TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.

PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS

SP490E RECEIVER

AC Characteristics

Maximum Data Rate 10 Mbps

Receiver Input to Output 20 45 100 ns tPLH; RDIFF = 54Ω,

CL1 = CL2 = 100pF;

Figures 3 & 7

Receiver Input to Output 20 45 100 ns tPHL; RDIFF = 54Ω,

CL1 = CL2 = 100pF;

Figures 3 & 7

Diff. Receiver Skew ItPLH-tPHLI13 nsR

DIFF = 54Ω; CL1 = CL2 = 100pF;

Figures 3 & 7

POWER REQUIREMENTS

Supply Voltage +4.75 +5.25 Volts

Supply Current 900 µA

ENVIRONMENTAL AND

CL1

15pF

CL2

RDIFF 500

Output

Under

Test

VCC

Figure 3. Driver/Receiver Timing Test Circuit Figure 4. Driver Timing Test Load #2 Circuit

VOD VOC

1kC

Receiver

Output S

Test Point V

Figure 1. Driver DC Test Load Circuit Figure 2. Receiver Timing Test Load Circuit

MECHANICAL

Operating Temperature

Commercial (_C_) 0 +70 °C

Industrial (_E_) -40 +85 °C

Storage Temperature -65 +150 °C

Package

Plastic DIP (_P)

NSOIC (_N)

Figure 5. Driver Propagation Delays

+3V

A, B 0V

1.5V 1.5V

f = 1MHz; t

< 10ns; t

< 10ns

A, B 2.3V

2.3V

0.5V

Output normally LOW

Output normally HIGH

Figure 6. Driver Enable and Disable Times

Figure 7. Receiver Propagation Delays

Y, Z

+3V

DRIVER

OUTPUT

DIFFERENTIAL

OUTPUT

– V

–

1.5V 1.5V

PLH

f = 1MHz; t

< 10ns; t

< 10ns

1/2V

PHL

DPLH

DPHL

SKEW =

DPLH -

DPHL

R1.5V 1.5V

PHL

f = 1MHz; t

< 10ns; t

< 10ns

OUTPUT

0D2

–

Y – Z 0V 0V

PLH

INPUT

SKEW =

PHL -

PLH

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

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

Receivers..................................................................±14V

Output Voltages

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

Drivers......................................................................±14V

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

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

Power Dissipation.....................................................................1000mW

SPECIFICATIONS

TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.

PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS

SP491E DRIVER

DC Characteristics

Differential Output Voltage GND VCC Volts Unloaded; R = ∞;

see Figure 1

Differential Output Voltage 2 VCC Volts With Load; R = 50Ω; (RS-422);

see Figure 1

Differential Output Voltage 1.5 VCC Volts

With Load; R = 27Ω; (RS-485);

see Figure 1

Change in Magnitude of Driver

Differential Output Voltage for

Complimentary States 0.2 Volts R = 27Ω or R = 50Ω;

see Figure 1

Driver Common-Mode

Output Voltage 3 Volts R = 27Ω or R = 50Ω;

see Figure 1

Input HIGH Voltage 2.0 Volts Applies to D, REB, DE

Input LOW Voltage 0.8 Volts Applies to D, REB, DE

Input Current ±10 µA Applies to D, REB, DE

Driver Short-Circuit Current

VOUT = HIGH 250 mA -7V ≤ VO ≤ 10V

VOUT = LOW 250 mA -7V ≤ VO ≤ 10V

SP491E DRIVER

AC Characteristics

Maximum Data Rate 10 Mbps RDIFF = 54Ω, CL1 = CL2 = 100pF

Driver Input to Output 20 30 60 ns tPLH; RDIFF = 54Ω, CL1 = CL2 = 100pF;

see Figures 3 and 5

Driver Input to Output 20 30 60 ns tPHL; RDIFF = 54Ω, CL1 = CL2 = 100pF;

see Figures 3 and 5

Driver Skew 5 10 ns

see Figures 3 and 5,

tSKEW = | tDPLH - tDPHL |

Driver Rise or Fall Time 3 15 40 ns From 10% to 90%; RDIFF = 54Ω,

= C

= 100pF;

see Figures 3 and 5

Driver Enable to Output HIGH 40 70 ns CL1 = CL2 = 100pF;

see Figures

4 and 6;

S2 closed

Driver Enable to Output LOW 40 70 ns CL1 = CL2 = 100pF;

see Figures

4 and 6;

S1 closed

Driver Disable Time from LOW 40 70 ns CL1 = CL2 = 15pF;

see Figures

4 and 6;

S1 closed

Driver Disable Time from HIGH

40 70 ns CL1 = CL2 = 15pF;

see Figures

4 and 6;

S2 closed

SPECIFICATIONS (continued)

TMIN to TMAX and VCC = 5V ± 5% unless otherwise noted.

PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS

SP491E

RECEIVER

DC Characteristics

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

Input Hysteresis 70 mV VCM = 0V

Output Voltage HIGH 3.5 Volts IO = -4mA, VID = +200mV

Output Voltage LOW 0.4 Volts IO = +4mA, VID = -200mV

Three State (high impedance)

Output Current ±1µA 0.4V ≤ VO ≤ 2.4V; REB = 5V

Input Resistance 12 15 kΩ-7V ≤ VCM ≤ 12V

Input Current (A, B); VIN = 12V ±1.0 mA DE = 0V, VCC = 0V or 5.25V, VIN = 12V

Input Current (A, B); VIN = -7V -0.8 mA DE = 0V, VCC = 0V or 5.25V, VIN = -7V

Short-Circuit Current 85 mA 0V ≤ VO ≤ VCC

SP491E

RECEIVER

AC Characteristics

Maximum Data Rate 10 Mbps REB = 0V, DE = 5V

Receiver Input to Output 20 45 100 ns tPLH; RDIFF = 54Ω,

CL1 = CL2 = 100pF;

Figures 3 & 7

Receiver Input to Output 20 45 100 ns tPHL; RDIFF = 54Ω,

CL1 = CL2 = 100pF;

Figures 3 & 7

Diff. Receiver Skew ItPLH-tPHLI13 nsR

DIFF = 54Ω; CL1 = CL2 = 100pF;

Figures 3 & 7

Receiver Enable to Output LOW

45 70 ns CRL = 15pF;

Figures 2 and 8;

S1 closed

Receiver Enable to Output HIGH

45 70 ns CRL = 15pF;

Figures 2 and 8;

S2 closed

Receiver Disable from LOW

45 70 ns CRL = 15pF;

Figures 2 and 8;

S1 closed

Receiver Disable from HIGH

45 70 ns CRL = 15pF;

Figures 2 and 8;

S2 closed

POWER REQUIREMENTS

Supply Voltage +4.75 +5.25 Volts

Supply Current 900 µA REB, D = 0V or VCC; DE = VCC

SP491E ENVIRONMENTAL

+3V

R0V

1.5V 1.5V

f = 1MHz; t

< 10ns; t

< 10ns

R1.5V

1.5V

0.5V

Output normally LOW

Output normally HIGH

Figure 8. Receiver Enable and Disable Times

AND MECHANICAL

Operating Temperature

Commercial (_C_) 0 +70 °C

Industrial (_E_) -40 +85 °C

Storage Temperature -65 +150 °C

Package

Plastic DIP (_P)

NSOIC (_N)

FEATURES

The SP490E and SP491E are full-duplex dif-

ferential transceivers that meet the requirements

of RS-485 and RS-422. Fabricated with a Sipex

proprietary BiCMOS process, both products

require a fraction of the power of older bipolar

designs.

THEORY OF OPERATION

The RS-485 standard is ideal for multi-drop

applications or 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 drivers for both the SP490E and SP491E

have differential outputs. 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 driver can maintain

greater than 1.5V voltage levels.

The driver of the SP491E has a driver enable

control line which is active high. A logic high on

DE (pin 4) of the SP491E will enable the differ-

ential driver outputs. A logic low on DE (pin 4)

of the SP491E will tri-state the driver outputs.

The SP490E does not have a driver enable.

Receivers

The receivers for both the SP490E and SP491E

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 for both the

SP490E and SP491E are 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.

The receiver of the SP491E has a receiver

enable control line which is active low. A logic

low on REB (pin 3) of the SP491E will enable

the differential receiver. A logic high on REB

(pin 3) of the SP491E will tri-state the receiver.

ESD Tolerance

The SP490E/SP491E devices incorporate

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 nor latch-up.

SW1SW1 SW2SW2

Device

Under

Test

DC Power

Source

SW1 SW2

Figure 9. ESD Test Circuit for Human Body Model

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 9. 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

to withstand an amount of static electricity when

ESD is applied to points and surfaces of the

RRS S andand RRV V add up to 330add up to 330ΩΩ f for IEC1000-4-2.or IEC1000-4-2.

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

Contact-Discharge ModuleContact-Discharge Module

SW1SW1 SW2SW2

Device

Under

Test

DC Power

Source

SW1 SW2

Contact-Discharge Module

Figure 10. ESD Test Circuit for IEC1000-4-2

Figure 11. ESD Test Waveform for IEC1000-4-2

t=0ns t=30ns

15A

30A

t ➙

i ➙

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 10. There are

two methods within IEC1000-4-2, the Air

Discharge method and the Contact Discharge

method.

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.

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

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 to the IC.

The circuit models in Figures 9 and 10 represent

the typical ESD testing circuits 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

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.

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.

The higher CS value and lower RS value in the

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.

SP490E/SP491E HUMAN BODY IEC1000-4-2

Family MODEL Air Discharge Direct Contact Level

Driver Outputs ±15kV ±15kV ±8kV 4

Receiver Inputs ±15kV ±15kV ±8kV 4

Table 1. Transceiver ESD Tolerance Levels

ALTERNATE

END PINS

(BOTH ENDS)

D1 = 0.005" min.

(0.127 min.)

PACKAGE: PLASTIC

DUAL–IN–LINE

(NARROW)

DIMENSIONS (Inches)

Minimum/Maximum

(mm)

A = 0.210" max.

(5.334 max).

LA2

A1 = 0.015" min.

(0.381min.)

e = 0.100 BSC

(2.540 BSC) e

= 0.300 BSC

(7.620 BSC)

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)

0.735/0.775

(18.669/19.685)

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°)

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°)

22–PIN8–PIN 14–PIN 16–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)

1.145/1.155

(29.083/29.337)

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°)

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)

0.780/0.800

(19.812/20.320)

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°)

18–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)

0.880/0.920

(22.352/23.368)

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°)

20–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)

0.980/1.060

(24.892/26.924)

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°)

PACKAGE: PLASTIC

SMALL OUTLINE (SOIC)

(NARROW)

DIMENSIONS (Inches)

Minimum/Maximum

(mm) 8–PIN

h x 45°

0.053/0.069

(1.346/1.748)

0.004/0.010

(0.102/0.249

0.014/0.019

(0.35/0.49)

0.189/0.197

(4.80/5.00)

0.150/0.157

(3.802/3.988)

0.050 BSC

(1.270 BSC)

0.228/0.244

(5.801/6.198)

0.010/0.020

(0.254/0.498)

0.016/0.050

(0.406/1.270)

0°/8°

(0°/8°)

14–PIN

0.053/0.069

(1.346/1.748)

0.004/0.010

(0.102/0.249)

0.013/0.020

(0.330/0.508)

0.337/0.344

(8.552/8.748)

0.150/0.157

(3.802/3.988)

0.050 BSC

(1.270 BSC)

0.228/0.244

(5.801/6.198)

0.010/0.020

(0.254/0.498)

0.016/0.050

(0.406/1.270)

0°/8°

(0°/8°)

16–PIN

0.053/0.069

(1.346/1.748)

0.004/0.010

(0.102/0.249)

0.013/0.020

(0.330/0.508)

0.386/0.394

(9.802/10.000)

0.150/0.157

(3.802/3.988)

0.050 BSC

(1.270 BSC)

0.228/0.244

(5.801/6.198)

0.010/0.020

(0.254/0.498)

0.016/0.050

(0.406/1.270)

0°/8°

(0°/8°)

Now available in Lead Free. To order add "-L' to the part number.

Example: SP488A = normal, SP488A-L = Lead free

ORDERING INFORMATION

Model Temperature Range Package

SP490ECN. ......................................................0˚C to +70˚C..................................................... 8-Pin NSOIC

SP490ECP........................................................0˚C to +70˚C........................................................... 8-Pin DIP

SP490EEN...................................................... -40˚C to +85˚C ................................................... 8-Pin NSOIC

SP490EEP ...................................................... -40˚C to +85˚C .........................................................8-Pin DIP

SP491ECN .......................................................0˚C to +70˚C................................................... 14-Pin NSOIC

SP491ECP........................................................0˚C to +70˚C......................................................... 14-Pin DIP

SP491EEN...................................................... -40˚C to +85˚C ................................................. 14-Pin NSOIC

SP491EEP ...................................................... -40˚C to +85˚C .......................................................14-Pin DIP

Corporation

SIGNAL PROCESSING EXCELLENCE

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 hereing; neither does it convey any license under its patent rights nor the rights of others.

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

Sipex Corporation

Headquarters and

Sales Office

22 Linnell Circle

Billerica, MA 01821

TEL: (978) 667-8700

FAX: (978) 670-9001

e-mail: sales@sipex.com

Sales Office

233 South Hillview Drive

Milpitas, CA 95035

TEL: (408) 934-7500

FAX: (408) 935-7600