SP483E_05_技术文档

®

SP483E

Enhanced Low EMI Half-Duplex

RS-485 Transceiver

■ +5V Only

■ Low Power BiCMOS

■ Driver/Receiver Enable for Multi-Drop

configurations

■ Enhanced ESD Specifications:

+15KV Human Body Model

+15KV IEC1000-4-2 Air Discharge

+8KV IEC1000-4-2 Contact Discharge

■ Low EMI Transceiver limited to 250kbps

Now Available in Lead Free Packaging

DESCRIPTION

The SP483E is a half-duplex transceiver that meets the specifications of RS-485 and RS-422

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 SP483 device as well as popular

industry standards. As with the original version, the SP483E features Sipex's BiCMOS

design allowing low power operation without sacrificing performance. The SP483E meet the

requirements of the RS-485 and RS-422 protocols up to 250kbps under load. The SP483E

is internally slew rate limited to reduce EMI and can meet the requirements of RS-485 and

RS-422 up to 250kbps. The SP483E is also equipped with a low power Shutdown mode.

8 Vcc

7 B

RO 1

RE 2

R

6 A

DE 3

DI 4

D

5 GND

SP483E

SP483EDS/05

SP483E Low EMI Half-Duplex RS485 Transceiver

1

ABSOLUTE MAXIMUM RATINGS

These are stress ratings only and functional operation of the device at

theseratingsoranyotherabovethoseindicatedintheoperationsections

ofthespecificationsbelowisnotimplied. Exposuretoabsolutemaximum

rating conditions for extended periods of time may affect reliability.

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

Input Voltages

Logic........................................................-0.3Vto(V_CC+0.5V)

Drivers..................................................-0.3Vto(V_CC+0.5V)

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

Output Voltages

Logic........................................................-0.3Vto(V_CC+0.5V)

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

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

StorageTemperature.......................................................-65˚Cto+150˚C

PowerDissipation...........................................................................500mW

SPECIFICATIONS

T_MINto T_MAXand V_CC= 5V ± 5% unless otherwise noted.

PARAMETERS

MIN.

TYP.

MAX. UNITS

CONDITIONS

SP483E DRIVER

DC Characteristics

Differential Output Voltage

GND

2

V_CC

Volts

Unloaded; R = ∞ ; see Figure 1

with load; R = 50Ω; (RS-422);

see Figure 1

Differential Output Voltage

Change in Magnitude of Driver

Differential Output Voltage for

Complimentary States

Driver Common-Mode

Output Voltage

Input High Voltage

Input Low Voltage

Input Current

1.5

V_CC

Volts

with load; R = 27Ω; (RS-485); see Figure 1

0.2

3

R = 27Ω or R = 50Ω; see Figure 1

Volts

R = 27Ω or R = 50Ω; see Figure 1

Applies to DE, DI, RE

DI

2.0

0.8

Driver Input

Control Lines

10µA

1µA

DE, RE

Driver Short-Circuit Current

V_OUT= HIGH

V_OUT= LOW

±250 mA

-7V ≤ V_O≤ +12V

SP483E DRIVER

AC Characteristics

Maximum Data Rate

250

Kbps

RE = 5V, DE = 5V; R_DIFF= 54Ω,

C_L1= C_L2= 100pF

t_PLH; R_DIFF= 54Ω, C_L1= C_L2= 100pF;

see Figures 3 and 5

t_PHL; R_DIFF= 54Ω, C_L1= C_L2= 100pF;

see Figures 3 and 5

see Figures 3 and 5,

Driver Input to Output

Driver Skew

800

100

2000 ns

800

ns

t_SKEW= | t_DPLH- t_DPHL

|

Driver Rise or Fall Time

250

2000 ns

From 10% to 90%; R_DIFF= 54Ω,

C_L1= C_L2= 100pF; see Figures 3 and

6

Driver Enable to Output High

Driver Enable to Output Low

Driver Disable Time from Low 300

Driver Disable Time from High 300

250

2000 ns

3000 ns

C_L= 100pF; see Figures 4 & 6; S₂closed

C_L= 100pF; see Figures 4 & 6; S₁closed

C_L= 15pF; see Figures 2 & 8; S₁closed

C_L= 15pF; see Figures 2 & 8; S₂closed

SP481E/SP485E RECEIVER

DC Characteristics

Differential Input Threshold

Input Hysteresis

Output Voltage High

Output Voltage Low

Three-State (High Impedance)

Output Current

-0.2

3.5

+0.2 Volts

mV

-7V ≤ V_CM≤ +12V

V_CM= 0V

I_O= -4mA, V_ID= +200mV

I_O= +4mA, V_ID= -200mV

20

15

Volts

0.4

Volts

±1

µA

kΩ

0.4V ≤ V_O≤ 2.4V; RE = 5V

-7V ≤ V_CM≤ +12V

DE = 0V, V_CC= 0V or 5.25V, V_IN= 12V

DE = 0V, V_CC= 0V or 5.25V, V_IN= -7V

0V ≤ V_CM≤ V_CC

Input Resistance

12

7

Input Current (A, B); V_IN= 12V

Input Current (A, B); V_IN= -7V

Short-Circuit Current

+1.0 mA

-0.8

95

mA

SP483EDS/05

SP483E Low EMI Half-Duplex RS485 Transceiver

2

SPECIFICATIONS (continued)

T_MINto T_MAXand V_CC= 5V ± 5% unless otherwise noted.

PARAMETERS

MIN.

TYP.

MAX. UNITS

CONDITIONS

SP483E RECEIVER

AC Characteristics

Maximum Data Rate

Receiver Input to Output

250

Kbps

2000 ns

RE = 0V, DE = 0V

t_PLH; R_DIFF= 54Ω,

C_L1= C_L2= 100pF; Figures 3 & 7

t_PHL; R_DIFF= 54Ω,

Receiver Input to Output

250

2000 ns

ns

C_L1= C_L2⁼100pF; Figures 3 & 7

R_DIFF= 54Ω; C_L1= C_L2= 100pF;

Figures 3 & 7

Diff. Receiver Skew It_PLH-t_PHL

I

100

45

Receiver Enable to

Output Low

70

ns

C_RL= 15pF; Figures 2 & 8; S₁closed

Receiver Enable to

Output High

Receiver Disable from Low

Receiver Disable from High

45

70

ns

C_RL= 15pF; Figures 2 & 8; S₂closed

C_RL= 15pF; Figures 2 & 8; S₁closed

C_RL= 15pF; Figures 2 & 8; S₂closed

SP483E

Shutdown Timing

Time to Shutdown

50

200

600

ns

RE = 5V, DE = 0V

Driver Enable from Shutdown

to Output High

Driver Enable from Shutdown

to Output Low

Receiver Enable from

Shutdown to Output High

Receiver Enable from

Shutdown to Output Low

2000 ns

2500 ns

C_L= 100pF; See Figures 4 & 6; S₂closed

C_L= 100pF; See Figures 4 & 6; S₁closed

C_L= 15pF; See Figures 2 & 8; S₂closed

C_L= 15pF; See Figures 2 & 8; S₁closed

300

POWER REQUIREMENTS

Supply Voltage

Supply Current

SP483E

+4.75

+5.25 Volts

No Load

900

600

µA

RE = 0V, DI = 0V or V_CC; DE = V_CC

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

SP483E

Shutdown Mode

10

µA

DE = 0V, RE=V_CC

ENVIRONMENTAL AND

MECHANICAL

Operating Temperature

Commercial (_C_)

Industrial (_E_)

Storage Temperature

Package

0

-40

-65

+70

+85

+150 °C

°C

Plastic DIP (_P)

NSOIC (_N)

SP483EDS/05

SP483E Low EMI Half-Duplex RS485 Transceiver

3

PIN FUNCTION

Pin 1 – RO – Receiver Output.

RO

RE

DE

DI

1

2

3

4

8

7

6

5

V

B

A

R

CC

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.

D

GND

6 – A – Driver Output/Receiver Input

SP485

Non-inverting.

Top View

Pin 7 – B – Driver Output/Receiver Input Inverting.

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

SP483E

Pinout (Top View)

A

Test Point

C_RL

1k

Receiver

Output

R

V_CC

S₁

S₂

V_OD

1k

V_OC

B

Figure 1. RS-485 Driver DC Test Load Circuit

Figure 2. Receiver Timing Test Load Circuit

C_L1

V_CC

A

B

R_DIFF

DI

A

B

500

RO

S₁

S₂

Output

Under

Test

C_L

C_L2

15pF

Figure 4. RS-485 Driver Timing Test Load #2 Circuit

Figure 3. RS-485 Driver/Receiver Timing Test Circuit

f = 100kHz; t < 10ns; t < 10ns

R

F

+3V

1.5V

DI

0V

B

t

PHL

PLH

1/2V

O

DRIVER

OUTPUT

V

O

A

t

DPLH

DPHL

+

DIFFERENTIAL

OUTPUT

V

O

0V

O

–

V – V

A

B

t

F

R

t

t t

| DPLH - DPHL |

SKEW =

Figure 5. Driver Propagation Delays

SP483EDS/05

SP483E Low EMI Half-Duplex RS485 Transceiver

4

INPUTS

OUTPUTS

INPUTS

OUTPUTS

LINE

RE DE DI CONDITION

RE

DE

0

A - B

+0.2V

R

1

B

0

A

1

0

1

X

1

0

1

0

No Fault

X

0

-0.2V

0

1

0

Inputs Open

X

1

X

Z

0

Z

Fault

Table 2. Receive Function Truth Table

Table 1. Transmit Function Truth Table

f = 100kHz; t_R< 10ns; t_F< 10ns

1.5V

+3V

DE

1.5V

0V

t_ZL

2.3V

t_LZ

5V

A, B

Output normally LOW

Output normally HIGH

0.5V

V_OL

V_OH

A, B

0V

2.3V

t_ZH

t_HZ

Figure 6. Driver Enable and Disable Times

+

–

V

0D2

0V

A – B

R

INPUT

0D2

V

OH

1.5V

f = 100kHz; t < 10ns; t < 10ns

1.5V

OUTPUT

V

OL

t

PLH

PHL

R

F

t

t t

| PHL - PLH |

SKEW =

Figure 7. Receiver Propagation Delays

f = 100kHz; t < 10ns; t < 10ns

+3V

R

F

1.5V

t

RE

R

0V

5V

t

ZL

LZ

1.5V

Output normally LOW

Output normally HIGH

0.5V

V

IL

V

IH

R

1.5V

0V

t

HZ

ZH

Figure 8. Receiver Enable and Disable Times

SP483EDS/05

SP483E Low EMI Half-Duplex RS485 Transceiver

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DESCRIPTION...

Receivers...

The SP483E is a half-duplex differential

transceiver that meets the requirements of

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

proprietary BiCMOS process, the SP483E

requires a fraction of the power of older bipolar

designs.

The SP483E 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 have a tri-state enable control pin.

A logic LOW on RE (pin 2) will enable the

receiver, alogicHIGHonRE(pin2)willdisable

the receiver.

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

groundpotentialdifferences. BecauseRS-485is

a differential interface, data is virtually immune

to noise in the transmission line.

The SP483E receiver is rated for data rates up

to 250 Kbps. The receivers 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.

Shutdown Mode...

Drivers...

TheSP483EisequippedwithaShutdownmode.

To enable the Shutdown state, both the driver

andreceivermustbedisabledsimultaneously. A

logic LOW on DE (pin 3) and a logic HIGH on

RE (pin 2) will put the SP483E into Shutdown

mode. In Shutdown, supply current will drop to

typically 1µA.

The driver outputs of the SP483E are differential

outputs meeting the RS-485 and RS-422 stan-

dards. 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 volt-

age levels. The drivers have an enable control

line which is active HIGH. A logic HIGH on DE

(pin3)willenablethedifferentialdriveroutputs.

A logic LOW on DE (pin 3) will tri-state the

driver outputs.

ESD TOLERANCE...

The SP483E device 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 nor latch-up.

The SP483E has internally slew rate limited

driver outputs to minimize EMI. The maximum

data rate for the SP483E drivers is 250 Kbps

under load.

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

SP483EDS/05

SP483E Low EMI Half-Duplex RS485 Transceiver

6

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

equipmentthatareaccessibletopersonnelduring

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.

The Human Body Model has been the generally

acceptedESDtestingmethodforsemiconductors.

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

duringnormalhandlingsuchasinmanufacturing

areaswheretheICstendtobehandledfrequently.

The IEC-1000-4-2, formerly IEC801-2, is

generallyusedfortestingESDonequipmentand

R

S

R

C

SW2

SW1

Device

Under

Test

DC Power

Source

C

S

Figure 9. ESD Test Circuit for Human Body Model

Contact-Discharge Module

R

S

R

V

C

SW2

SW1

Device

Under

Test

DC Power

Source

C

S

R

and R add up to 330Ω for IEC1000-4-2.

S

V

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

SP483EDS/05

SP483E Low EMI Half-Duplex RS485 Transceiver

7

With the Air Discharge Method, an ESD voltage

is applied to the equipment under test (EUT)

throughair. Thissimulatesanelectricallycharged

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.

30A

15A

0A

t=0ns

t=30ns

t ➙

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

voltage stored in the capacitor is then applied

throughR_S, thecurrentlimitingresistor, ontothe

device under test (DUT). In ESD tests, the SW2

switch is pulsed so that the device under test

receives a duration of voltage.

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

handheldsystems,theESDchargecanbedirectly

dischargedtotheequipmentfromapersonalready

holdingtheequipment. Thecurrentistransferred

ontothekeypadortheserialportoftheequipment

directly andthentravelsthroughthePCBandfinally

to the IC.

Forthe HumanBodyModel, the current limiting

resistor (R ) and the source capacitor (C ) are

1.5kΩ an 10^S0pF, respectively. For IEC-10^S00-4-

2,thecurrentlimitingresistor(R_S)andthesource

capacitor (C_S) are 330Ω an 150pF, respectively.

The higher C value and lower R_Svalue in the

IEC1000-4-2^Smodel are more stringent than the

HumanBodyModel. Thelargerstoragecapacitor

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.

The circuit model in Figures 9 and 10 represent

the typical ESD testing circuit used for all three

methods. TheC_SisinitiallychargedwiththeDC

power supply when the first switch (SW1) is on.

Now that the capacitor is charged, the second

switch(SW2)isonwhileSW1switchesoff. The

HUMAN BODY

MODEL

IEC1000-4-2

Air Discharge Direct Contact

DEVICE PIN

TESTED

Level

Driver Outputs

Receiver Inputs

±15kV

±8kV

4

Table 1. Transceiver ESD Tolerance Levels

SP483EDS/05

SP483E Low EMI Half-Duplex RS485 Transceiver

8

PACKAGE: PLASTIC

DUAL–IN–LINE

(NARROW)

E1

E

D1 = 0.005" min.

(0.127 min.)

A1 = 0.015" min.

(0.381min.)

D

A = 0.210" max.

(5.334 max).

C

A2

Ø

L

B1

B

e

= 0.300 BSC

(7.620 BSC)

e = 0.100 BSC

(2.540 BSC)

A

ALTERNATE

END PINS

(BOTH ENDS)

DIMENSIONS (Inches)

Minimum/Maximum

(mm)

8–PIN

0.115/0.195

(2.921/4.953)

A2

0.014/0.022

(0.356/0.559)

B

0.045/0.070

B1

C

(1.143/1.778)

0.008/0.014

(0.203/0.356)

0.355/0.400

(9.017/10.160)

D

0.300/0.325

(7.620/8.255)

E

0.240/0.280

E1

L

(6.096/7.112)

0.115/0.150

(2.921/3.810)

0°/ 15°

(0°/15°)

Ø

SP483EDS/05

SP483E Low EMI Half-Duplex RS485 Transceiver

9

PACKAGE: PLASTIC

SMALL OUTLINE (SOIC)

(NARROW)

E

H

h x 45°

D

A

Ø

A1

L

e

B

DIMENSIONS (Inches)

Minimum/Maximum

(mm)

8–PIN

A

A1

B

D

E

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)

e

0.050 BSC

(1.270 BSC)

H

h

0.228/0.244

(5.801/6.198)

0.010/0.020

(0.254/0.498)

L

0.016/0.050

(0.406/1.270)

Ø

0°/8°

(0°/8°)

SP483EDS/05

SP483E Low EMI Half-Duplex RS485 Transceiver

10

ORDERING INFORMATION

Model

Temperature Range

Package

SP483ECN ....................................................... 0˚C to +70˚C............................................... 8-pin Narrow SOIC

SP483ECP........................................................ 0˚C to +70˚C...................................................8-pin Plastic DIP

SP483EEN.......................................................-40˚C to +85˚C............................................. 8-pin Narrow SOIC

SP483EEP ...................................................... -40˚C to +85˚C .................................................8-pin Plastic DIP

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

Available in lead free packaging. To order, add "-L" suffix to the part number.

Example: SP483ECN = standard; SP483ECN -L = lead free.

Co rp o ra tio n

SIGNAL PROCESSING EXCELLENCE

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

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.

SP483EDS/05

SP483E Low EMI Half-Duplex RS485 Transceiver

11


型号：	SP483E_05
厂家：	SIPEX CORPORATION
描述：	Enhanced Low EMI Half-Duplex RS-485 Transceiver 增强型低EMI半双工RS- 485收发器
文件：	总11页 (文件大小：83K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SP483E_05 [SIPEX]

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