SP487EET_技术文档

®

SP486E and SP487E

Enhanced Quad RS-485/RS-422 Line Drivers

■ RS-485 or RS-422 Applications

■ Quad Differential Line Drivers

■ Driver Output Disable

■ –7V to +12V Common Mode Output

Range

■ 100µA Supply Current

■ Single +5V Supply Operation

■ Superior Drop-in Replacement for

SN75172, SN75174, LTC486, and

LTC487

■ Improved ESD Specifications:

+15kV Human Body Model

+15kV IEC1000-4-2 Air Discharge

+8kV IEC1000-4-2 Contact Discharge

DESCRIPTION…

The SP486E and SP487E are low-power quad differential line drivers that meet the

specifications of RS-485 and RS-422 serial protocols with enhanced ESD performance. The

ESD tolerance has been improved on these devices to over +15kV for both Human Body

Model and IEC1000-4-2 Air Discharge Method. These devices are superior drop-in replace-

ments to Sipex's SP486 and SP487 devices as well as popular industry standards. As with

the original versions, the SP486E features a common driver enable control and the SP487E

provides independent driver enable controls for each pair of drivers. Both feature wide

common-mode input ranges. Both are available in 16-pin plastic DIP and SOIC packages.

DI₁

DO₁A

DO₁B

EN

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

V_CC

DI₁

DO₁A

DO₁B

EN₁/EN₂

DO₂B

DO₂A

DI₂

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

V_CC

SP486E

4

SP487E

4

1

DI₄

DO₄A

DO₄B

EN

DO₄A

DO₄B

EN₃/EN₄

DO₃B

DO₃A

DI₃

DO₂B

DO₂A

DI₂

DO₃B

DO₃A

DI₃

2

3

GND

SP486E/487EDS/06

SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers

1

ABSOLUTE MAXIMUM RATINGS

Thesearestressratingsonlyandfunctionaloperation

of the device at these 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.

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

Input Voltages

Logic....................................–0.5V to (V_CC+0.5V)

Drivers ................................. –0.5V to (V_CC+0.5V)

Driver Output Voltage ................................... +14V

Input Currents

Logic........................................................ +25mA

Driver....................................................... +25mA

Storage Temperature ................. –65°C to +150°C

Power Dissipation

Plastic DIP .............................................. 375mW

(derate 7mW/°C above +70°C)

Small Outline .......................................... 375mW

(derate 7mW/°C above +70°C)

Lead Temperature (soldering, 10 sec) ......... 300°C

SPECIFICATIONS

V_CC= 5V±5%; typicals at 25°C; T_MIN≤ T_A≤ T_MAXunless otherwise noted.

PARAMETER

MIN.

TYP.

MAX.

UNIT

CONDITIONS

DC CHARACTERISTICS

Digital Inputs

Voltage

V_IL

DI, EN, EN, EN₁/EN₂, EN₃/EN₄

0.8

+2

Volts

µA

V_IH

2.0

Input Current

V = 0V to V

IN CC

DRIVER OUTPUTS

Differential Voltage

V_CC

Volts

I_O= 0; unloaded

2

1.5

R_L= 50Ω(RS-422)

R_L= 27Ω (RS-485); Fig. 1

R_L= 27Ω or 50Ω ; Fig. 1

2

V_CC

0.2

Change in Output Magnitude

for Complementary Output State

Common Mode Output Voltage

Change in Common Mode Output Magnitude

for Complementary Output State

2.3

3

0.2

Volts

R_L= 27Ω or 50Ω; Fig. 1

R_L= 50Ω (RS-422)

R_L= 27Ω (RS-485)

Maximum Data Rate

10

Mbps

Short–circuit Current

V_OH

V_OL

+250

+200

mA

µA

–7V ≤V_O≤ +12V

V_O= –7V to +12V

High Impedance Output Current

+2

POWER REQUIREMENTS

Supply Voltage

Supply Current

4.75

5.00

0.5

5.25

10

Volts

mA

No load, output enabled

No load, output disabled

0.5

10

µA

ENVIRONMENTAL AND MECHANICAL

Operating Temperature

–C

–E

0

–40

–65

+70

+85

+150

°C

Storage Temperature

Package

–_P

16–pin Plastic DIP

16–pin SOIC

–_T

SP486E/487EDS/06

SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers

2

PINOUT — SP486E

DI₁

DO₁A

DO₁B

EN

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

V_CC

SP486E

4

S₁

S₂

1

DI₄

V_CC

500 ohms

OUTPUT

UNDER TEST

DO₄A

DO₄B

EN

C_L

DO₂B

DO₂A

DI₂

DO₃B

DO₃A

DI₃

2

Figure 3. Driver Timing Test Load

3

GND

Pin 8 — GND — Digital Ground.

Pin 9 — DI₃— Driver 3 Input — If Driver 3

output is enabled, logic 0 on DI₃forces driver

output DO₃A low and DO₃B high. A logic 1 on

DI₃with Driver 3 output enabled forces driver

DO₃A high and DO₃B low.

SP486E PINOUT

Pin 1 — DI₁— Driver 1 Input — If Driver 1

output is enabled, logic 0 on DI₁forces driver

output DO₁A low and DO₁B high. A logic 1 on

DI₁with Driver 1 output enabled forces driver

DO₁A high and DO₁B low.

Pin 10 — DO₃A — Driver 3 output A.

Pin 11 — DO₃B — Driver 3 output B.

Pin 2 — DO₁A — Driver 1 output A.

Pin 3 — DO₁B — Driver 1 output B.

Pin 12 — EN — Driver Output Disable. Please

refer to SP486E Truth Table (1).

Pin 4 — EN — Driver Output Enable. Please

refer to SP486E Truth Table (1).

Pin 13 — DO₄B — Driver 4 output B.

Pin 14 — DO₄A — Driver 4 output A.

Pin 5 — DO2B — Driver 2 output B.

Pin 6 — DO₂A — Driver 2 output A.

Pin 15 — DI — Driver 4 Input — If Driver 4

output is ena⁴bled, logic 0 on DI₄forces driver

output DO₄A low and DO₄B high. A logic 1 on

DI₄with Driver 3 output enabled forces driver

DO₄A high and DO₄B low.

Pin 7 — DI₂— Driver 2 Input — If Driver 2

output is enabled, logic 0 on DI₂forces driver

output DO₂A low and DO₂B high. A logic 1 on

DI₂with Driver 2 output enabled forces driver

DO₂A high and DO₂B low.

Pin 16 — Supply Voltage V_CC— 4.75V ≤ V_CC

5.25V.

≤

A

EN

C_L1

R

A

V_DO

DRIVER

R_DIFF

DI

R

V_OC

B

C_L2

B

EN

Figure 2. Driver Timing Test

Figure 1. Driver DC Test Load

SP486E/487EDS/06

SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers

3

PINOUT — SP487E

INPUT

DI

ENABLES

OUTPUTS

EN

X

OUTA

OUTB

DI₁

DO₁A

DO₁B

EN₁/EN₂

DO₂B

DO₂A

DI₂

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

V_CC

SP487E

4

H

L

H

X

L

H

L

H

1

DI₄

X

DO₄A

DO₄B

EN₃/EN₄

DO₃B

DO₃A

DI₃

H

L

H

L

H

X

H

Hi–Z

Table 1. SP486E Truth Table

2

3

GND

Pin 11 — DO₃B — Driver 3 output B.

Pin 12 — EN₃/EN₄— Driver 3 and 4 Output

Enable. Please refer to SP487E Truth Table (2).

SP487E PINOUT

Pin 1 — DI₁— Driver 1 Input — If Driver 1

output is enabled, logic 0 on DI₁forces driver

output DO₁A low and DO₁B high. A logic 1 on

DI₁with Driver 1 output enabled forces driver

DO₁A high and DO₁B low.

Pin 13 — DO₄B — Driver 4 output B.

Pin 14 — DO₄A — Driver 4 output A.

Pin 15 — DI — Driver 4 Input — If Driver 4

output is ena⁴bled, logic 0 on DI₄forces driver

output DO₄A low and DO₄B high. A logic 1 on

DI₄with Driver 3 output enabled forces driver

DO₄A high and DO₄B low.

Pin 2 — DO₁A — Driver 1 output A.

Pin 3 — DO₁B — Driver 1 output B.

Pin 4 — EN₁/EN₂— Driver 1 and 2 Output

Enable. Please refer to SP487E Truth Table (2).

Pin 16 — Supply Voltage V_CC— 4.75V ≤ V_CC

≤

5.25V.

Pin 5 — DO₂B — Driver 2 output B.

Pin 6 — DO₂A — Driver 2 output A.

FEATURES…

The SP486E and SP487E are low–power quad

differential line drivers meeting RS-485 and

RS-422 standards. The SP486E features active

high and active low common driver enable

controls; the SP487E provides independent,

active high driver enable controls for each pair

of drivers. The driver outputs are short–circuit

limited to 200mA. Data rates up to 10Mbps are

supported. Both are available in 16–pin plastic

DIP and SOIC packages.

Pin 7 — DI₂— Driver 2 Input — If Driver 2

output is enabled, logic 0 on DI₂forces driver

output DO₂A low and DO₂B high. A logic 1 on

DI₂with Driver 2 output enabled forces driver

DO₂A high and DO₂B low.

Pin 8 — GND — Digital Ground.

Pin 9 — DI₃— Driver 3 Input — If Driver 3

output is enabled, logic 0 on DI₃forces driver

output DO₃A low and DO₃B high. A logic 1 on

DI₃with Driver 3 output enabled forces driver

DO₃A high and DO₃B low.

INPUT

DI

ENABLES

OUTPUTS

EN1/EN2 or EN3/EN4 OUTA

OUTB

L

H

L

H

L

H

L

H

Pin 10 — DO₃A — Driver 3 output A.

X

Hi–Z

Table 2. SP487E Truth Table

SP486E/487EDS/06

SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers

4

F = 1MHZ: t_r< 10ns: t_f< 10ns

1.5V

3V

0V

DI

1.5V

t_PLH

t_PHL

B

A

V_O

₂¹V_O

V_DIFF= V(A) – V(B)

V_O

90%

10%

90%

10%

–V_O

t_r

t_f

Figure 4. Driver Propagation Delays

AC PARAMETERS

V_CC= 5V±5%; typicals at 25°C; T_AMB= 25°C unless otherwise noted.

PARAMETER

MIN.

TYP.

MAX.

UNIT

CONDITIONS

PROPAGATION DELAY

Driver Input to Output

R_DIFF= 54 Ohms, C_L1= C_L2=

100pF; Figure 2

Low to High (t_PLH

High to Low (t_PHL

Differential Skew (t_SKEW

Driver Rise Time (t_R)

SP486E

)

20

40

5

60

15

ns

)

t_SKEW= t_PLH- t_PHL

10% to 90%

20

ns

SP487E

Driver Fall Time (t_F)

SP486E

90% to 10%

20

ns

SP487E

DRIVER ENABLE

To Output High

60

110

115

ns

C_L= 100pF; Figures 3 and 5

(S₂closed)

C_L= 100pF; Figures 3 and 5

(S₁closed)

To Output Low

DRIVER DISABLE

From Output Low

60

130

ns

C_L= 15pF; Figures 3 and 5

(S₁closed)

C_L= 15pF; Figures 3 and 5

(S₂closed)

From Output High

SP486E/487EDS/06

SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers

5

F = 1MHZ: t_r< 10ns: t_f< 10ns

1.5V

3V

0V

EN

1.5V

t_ZL

t_LZ

V_C

5V

C

A, B

V_O

2.3V

0.5V

V_OL

Output normally low

Output normally high

2.3V

V_OH

0V

t_ZH

t_HZ

Figure 5. Driver Enable/Disable Timing

R

S

R

C

SW2

SW1

Device

Under

Test

DC Power

Source

C

S

Figure 6. ESD Test Circuit for Human Body Model

CCoonnttaacctt--DDiisscchhaarrggee MMoodduullee

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 7. ESD Test Circuit for IEC1000-4-2

SP486E/487EDS/06

SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers

6

ESD TOLERANCE

The SP486E and SP487E 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.

30A

15A

0A

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

t=0ns

t=30ns

t ➙

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

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

showninFigure6. ThismethodwilltesttheIC’s

capability to withstand an ESD transient during

normal handling such as in manufacturing areas

where the ICs tend to be handled frequently.

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.

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

generallyusedfortestingESDonequipmentand

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 7. There are

two methods within IEC1000-4-2, the Air

Discharge method and the Contact Discharge

method.

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.

SP486E/487EDS/06

SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers

7

The circuit model in Figures 6 and 7 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

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 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.

Forthe HumanBodyModel, the current limiting

resistor (R_S) and the source capacitor (C_S) are

1.5kWan100pF,respectively. ForIEC-1000-4-2,

the current limiting resistor (R_S) and the source

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

DEVICE PIN

TESTED

HUMAN BODY

MODEL

IEC1000-4-2

Air Discharge Direct Contact

Level

Driver Outputs

Receiver Inputs

+15kV

+8kV

4

Table 3. Transceiver ESD Tolerance Levels

SP486E/487EDS/06

SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers

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

A

e = 0.100 BSC

(2.540 BSC)

(7.620 BSC)

ALTERNATE

END PINS

(BOTH ENDS)

DIMENSIONS (Inches)

Minimum/Maximum

(mm)

16–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)

0.780/0.800

(19.812/20.320)

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

SP486E/487EDS/06

SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers

9

PACKAGE: PLASTIC

SMALL OUTLINE (SOIC)

(WIDE)

E

H

D

A

Ø

A1

L

e

B

DIMENSIONS (Inches)

Minimum/Maximum

(mm)

16–PIN

A

A1

B

D

E

0.093/0.104

(2.352/2.649)

0.004/0.012

(0.102/0.300)

0.013/0.020

(0.330/0.508)

0.398/0.413

(10.10/10.49)

0.291/0.299

(7.402/7.600)

e

0.050 BSC

(1.270 BSC)

H

L

0.394/0.419

(10.00/10.64)

0.016/0.050

(0.406/1.270)

Ø

0°/8°

(0°/8°)

SP486E/487EDS/06

SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers

10

ORDERING INFORMATION

Quad RS485 Drivers:

Model .................................. Enable/Disable ........................ Temperature Range ......................... Package

SP486ECP ....... Common; active Low and Active High ............ 0°C to +70°C ..................16–pin Plastic DIP

SP486ECT........ Common; active Low and Active High ............ 0°C to +70°C ........................... 16–pin SOIC

SP486EEP........ Common; active Low and Active High .......... –40°C to +85°C................16–pin Plastic DIP

SP486EET ........ Common; active Low and Active High .......... –40°C to +85°C......................... 16–pin SOIC

SP487ECP ............ One per driver pair; active High ................. 0°C to +70°C ..................16–pin Plastic DIP

SP487ECT............. One per driver pair; active High ................. 0°C to +70°C ........................... 16–pin SOIC

SP487EEP............. One per driver pair; active High ............... –40°C to +85°C................16–pin Plastic DIP

SP487EET ............. One per driver pair; active High ............... –40°C to +85°C......................... 16–pin SOIC

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

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.

SP486E/487EDS/06

SP486E/487E Enhanced Quad RS-485/RS-422 Line Drivers

11


型号：	SP487EET
厂家：	SIPEX CORPORATION
描述：	Enhanced Quad RS-485/RS-422 Line Drivers 增强型四RS - 485 / RS - 422线路驱动器线路驱动器或接收器驱动程序和接口接口集成电路光电二极管
文件：	总11页 (文件大小：115K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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