SP522CF_技术文档

®

SP522/SP524

Low-Cost Programmable

Multi-Protocol Transceivers

■ SP522 — 2 Drivers and 2 Receivers

■ SP524 — 4 Drivers and 4 Receivers

■ Driver and Receiver Tri-State Control

■ Low-Cost WAN Solution

■ Loopback Function for Diagnostics

■ Software Selectable Interface Modes:

-RS-232 (V.28), RS-423 (V.10)

-RS-422 (V.11, X.21), RS-485

DESCRIPTION

The SP522/524 is a monolithic device that supports three serial interface standards for Wide

AreaNetworkConnectivity. TheSP522/524isideallysuitedformulti-protocoldesignsthatare

cost and space sensitive. The SP522/524 is fabricated using a low power BiCMOS process

technology.Two(2)driversandtwo(2)receiversfortheSP522canbeconfiguredviasoftware

for any of the above interface modes at any time. The SP524 offers two (2) additional drivers

and two (2) additional receivers.

+5V

VDD

IN5819

+5V

VDD

10µF

1N5819

V

SS

10µF

+

V^SS

28

14

19

29

2

10µF

VSS

VDD

VCC

VCC VCC

10µF

SP524

+

LATCH_EN

30

31

DP0

21

VDD

13

VCC

22

VSS

DECODER LOGIC

32

LOOPBCK

23

DP1

SP522

T1OUTA

22

24

T1IN

36

LATCH_EN

2

8

DP0

T1

T1OUTB

20

ENT1

T2OUTA

18

DECODER LOGIC

7

LOOPBCK

23

25

T2IN

35

ENT2

44

R1OUT

40

T2

R1

T2OUTB

17

R1INA

3

R1INB

DP1

4

T1OUTA

11

R2INA

ENR1

43

R2OUT

39

10

T1IN

6

5

T1

R2

R2INB

T1OUTB

12

6

ENR2

ENT1

T2OUTA

15

T3OUTA

16

9

T2IN

4

ENT2

1

R1OUT

26

T3IN

34

T3

T2

R1

T3OUTB

15

T2OUTB

16

R1INA

18

R1INB

17

ENT3

T4OUTA

13

27

T4IN

33

ENT4

42

R3OUT

38

T4

R3

T4OUTB

11

R3INA

7

5

R3INB

8

R2INA

20

R2INB

ENR1

24

R2OUT

ENR3

41

R4OUT

37

R4INA

R2

9

R4

R4INB

19

10

3

ENR4

ENR2

GND

1

GND

21

GND

12

14

GND

SP522DS/07

SP522 Multi–Mode Serial Transceivers

1

SPECIFICATIONS

Typical @ 25°C and nominal supply voltages unless otherwise noted.

MIN.

TYP.

MAX.

UNITS

CONDITIONS

LOGIC INPUTS

V_IL

V_IH

0.8

Volts

2.0

LOGIC OUTPUTS

V_OL

V_OH

0.4

0.8

Volts

I_OUT= –3.2mA

I_OUT1.0mA

2.4

=

RS422 DRIVER

TTL Input Levels

V_IL

0

2.0

Volts

V_IH

Outputs

Differential Output

Open Circuit Voltage,V_O

Balance

+2.0

+5.0

+6.0

+0.4

+3.0

+150

+100

40

Volts

mA

µA

nS

Mbps

R=50Ω; see Figure 1

|V_T| – |V_T|

Offset

Short Circuit Current

Power Off Current

Transition Time

Max. Transmission Rate

Propagation Delay

t_PHL

V_out= 0V

V_cc= 0V, V_out= +0.25V

Rise/fall time, 10%-90%

R_L=100Ω

T_A= +25°C

R_DIFF=100Ω, Figures 3 & 5

10

90

150

nS

t_PLH

RS422 RECEIVER

TTL Output Levels

V_OL

0.4

Volts

V_OH

2.4

Input

High Threshold

Low Threshold

Common Mode Range

High Input Current

Low Input Current

Receiver Sensitivity

Input Impedance

Max. Transmission Rate

Propagation Delay

t_PHL

+0.3

-6.0

-7.0

+6.0

-0.3

+7.0

Volts

(a)-(b)

Refer to Rec. input graph

V_CM= +7V to -7V

+0.3

Volts

kΩ

Mbps

4

10

T_A= +25°C

Figures 3 & 7

110

175

nS

t_PLH

RS485 DRIVER

TTL Input Levels

V_IL

0.8

Volts

V_IH

2.0

Outputs

Differential Output

Open Circuit Voltage,V_O

Balance

+1.5

+5.0

+6.0

+0.2

Volts

mA

nS

R=27Ω; C_L=50pF; see Fig. 1

|V_T| – |V_T|

R_L=54Ω

Output Current

Short Circuit Current

Transition Time

Max. Transmission Rate

Propagation Delay

t_PHL

28.0

10

+200

V_out= –7V to +7V

Rise/fall time, 10%-90%

R_L=54Ω

Figures 3 & 5; T_A= +25°C

R_DIFF=54Ω, C_RL= 50pF

40

Mbps

100

150

nS

t_PLH

SP522DS/07

SP522 Multi–Mode Serial Transceivers

2

SPECIFICATIONS

Typical @ 25°C and nominal supply voltages unless otherwise noted.

MIN.

TYP.

MAX.

UNITS

CONDITIONS

RS485 RECEIVER

TTL Output Levels

V_OL

0.4

Volts

V_OH

2.4

Input

Common Mode Range

High Input Current

Low Input Current

Receiver Sensitivity

Input Impedance

Max. Transmission Rate

Propagation Delay

t_PHL

-7.0

+12.0

Volts

Refer to Rec. input graph

V_CM= +12V to -7V

±0.1

Volts

kΩ

Mbps

12

10

V_CM= +12V to -7V

T_A= +25°C

Figures 3 & 7

110

175

nS

t_PLH

RS232 DRIVER

TTL Input Level

V_IL

0.8

Volts

V_IH

2.0

Outputs

High Level Output

Low Level Output

Open Circuit Voltage

Short Circuit Current

Power Off Impedance

Slew Rate

+5.0

-15.0

-15

+15

-5.0

+15

Volts

mA

Ω

V/µs

R_L=3KΩ, V_IN=0.8V

R_L=3KΩ, V_IN=2.0V

+100

V_out= 0V

300

V_cc= 0V, V_out= ±2.0V

R_L=3KΩ, C_L=50pF,

between +3V to –3V

R_L=3KΩ, C_L=2500pF

T_A= +25°C

30

Transition Time

Max. Transmission Rate

Propagation Delay

t_PHL

1.5

µs

Kbps

120

2

8

µS

R_L=3KΩ

t_PLH

RS232 RECEIVER

TTL Output Levels

V_OL

V_OH

Input

High Threshold

Low Threshold

Receiver Open Circuit Bias

Input Impedance

Max. Transmission Rate

Propagation Delay

t_PHL

0.4

3.0

Volts

2.4

0.8

1.7

1.2

Volts

KΩ

+2.0

7

3

120

5

Kbps

T_A= +25°C

0.2

1

µS

t_PLH

RS423 DRIVER

TTL Input Levels

V_IL

0.8

Volts

V_IH

2.0

Output

V_DD= +5V, V_SS= –5V

R_L=450Ω, V_T= 0.9*V_OC

High Level Output

Low Level Output

Open Circuit Voltage

Short Circuit Current

+3.6

-6.0

+4.0

+6.0

-3.6

+6.0

+150

Volts

mA

V_OUT= 0V

SP522DS/07

SP522 Multi–Mode Serial Transceivers

3

SPECIFICATIONS (Continued)

Typical @ 25°C and nominal supply voltages unless otherwise noted.

MIN.

TYP.

MAX.

UNITS

CONDITIONS

RS-423 DRIVER

Power Off Current

Transition Time

Max. Transmission Rate

Propagation Delay

t_PHL

±100

1.0

µA

µs

Kbps

V_CC= 0V, V_OUT= +0.25V

Rise/fall time, 10-90%

R_L=450Ω

T_A= +25°C

R_L=450Ω

120

2

8

µS

t_PLH

R_L=450Ω

RS423 RECEIVER

TTL Output Levels

V_OL

0

2.4

0.4

Volts

V_OH

Input

High Threshold

Low Threshold

Common Mode Range

High Input Current

Low Input Current

Receiver Sensitivity

Input Impedance

Max. Transmission Rate

Propagation Delay

t_PHL

+0.3

-7.0

+7.0

-0.3

+7.0

Volts

Refer to Rec. input graph

V_CM= +7V to -7V

+0.3

Volts

KΩ

Kbps

4

120

V_IN= +10V to -10V

T_A= +25°C

0.5

1

µS

t_PLH

POWER REQUIREMENTS

V_CC

V_DD

V_SS

I_CC

I_DD

I_SS

+4.75

+9.5

-9.5

+5.0

+10.0

-10.0

4

10

+5.25

+10.5

-10.5

Volts

mA

V_CC= +5V; DP0=DP1=0V

V_DD= +10V; DP0=DP1=0V

V_SS= –10V; DP0=DP1=0V

ENVIRONMENTAL AND MECHANICAL

Operating Temperature Range

Storage Temperature Range

Package

0

-65

+70

+150

°C

24-pin SOIC, 24-pin SSOP, 44–pin QFP

RECEIVER INPUT GRAPHS

V.10 RECEIVER

V.11 RECEIVER

RS485 RECEIVER

+3.25mA

+1.0mA

–7V –3V

–10V

–3V

–10V

–3V

+6V

+12V

+3V

+10V

+3V

+10V

1 Unit Load

Maximum Input Current

versus Voltage

Maximum Input Current

versus Voltage

Maximum Input Current

versus Voltage

–0.6mA

–3.25mA

SP522DS/07

SP522 Multi–Mode Serial Transceivers

4

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.

V

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

_DD........................................................................+12V

V_SS..........................................................................–12V

Input Voltages

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

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

Receivers..........................±30V@≤100mA

Outputs Voltages

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

Drivers................................................+15V

Receivers........................-0.5Vto(V_CC+0.5V)

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

Power Dissipation.........................................2000mW

OTHER AC CHARACTERISTICS

(Typical @ 25°C and nominal supply voltages unless otherwise noted)

PARAMETER

MIN.

TYP.

MAX.

UNITS

CONDITIONS

DRIVER DELAY TIME FROM ENABLE MODE TO TRI–STATE MODE

SINGLE–ENDED MODE (RS-232, RS-423)

t_PZL; Enable to Output low

t_PZH; Enable to Output high

t_PLZ; Disable from Output low

t_PHZ; Disable from Output high

600

300

900

ns

3KΩ pull–up to output

3KΩ pull–down to output

5V to input

GND to input

DIFFERENTIAL MODE (RS-422, RS-485)

t_PZL; Enable to Output low

100

120

100

160

ns

C_L= 100pF, Fig. 4 & 6; S₁

closed

C_L= 100pF, Fig. 4 & 6; S₂

closed

C_L= 15pF, Fig. 4 & 6; S₁

closed

C_L= 15pF, Fig. 4 & 6; S₂

closed

t_PZH; Enable to Output high

t_PLZ; Disable from Output low

t_PHZ; Disable from Output high

RECEIVER DELAY TIME FROM ENABLE MODE TO TRI–STATE MODE

SINGLE–ENDED MODE (RS-232, RS-423)

t_PZL; Enable to Output low

t_PZH; Enable to Output high

t_PLZ; Disable from Output low

t_PHZ; Disable from Output high

125

120

90

ns

3KΩ pull–up to output

3KΩ pull–down to output

5V to input

90

GND to input

DIFFERENTIAL MODE (RS-422, RS-485)

t_PZL; Enable to Output low

125

120

90

ns

C_RL= 15pF, Fig. 2 & 8; S₁

closed

C_RL= 15pF, Fig. 2 & 8; S₂

closed

C_RL= 15pF, Fig. 2 & 8; S₁

closed

C_RL= 15pF, Fig. 2 & 8; S₂

closed

t_PZH; Enable to Output high

t_PLZ; Disable from Output low

t_PHZ; Disable from Output high

90

SP522DS/07

SP522 Multi–Mode Serial Transceivers

5

A

1K

Test Point

1K

Receiver

Output

R

V

CC

S

1

V

OD

C

RL

V

OC

2

B

Figure 1. Driver DC Test Load Circuit

Figure 2. Receiver Timing Test Load Circuit

3V

DE

C

L1

V

CC

S

1

A

B

A

B

DI

R

DIFF

500

Output

RO

Under

L2

Test

C

L

15pF

S

2

Figure 3. Driver/Receiver Timing Test Circuit

Figure 4. Driver Timing Test Load #2 Circuit

f = 1MHz; t < 10ns; t < 10ns

R

F

+3V

1.5V

DRIVER INPUT

0V

t

PHL

PLH

A

1/2V

O

DRIVER

OUTPUT

V

O

B

t

SKEW

+

V

DIFFERENTIAL

OUTPUT

O

0V

–

V – V

A

O

B

t

R

F

Figure 5. Driver Propagation Delays

SP522DS/07

SP522 Multi–Mode Serial Transceivers

6

f = 1MHz; t < 10ns; t < 10ns

R

F

+3V

0V

1.5V

DE

A, B

t

LZ

ZL

5V

2.3V

Output normally LOW

Output normally HIGH

0.5V

V

OL

V

OH

2.3V

0V

t

HZ

ZH

Figure 6. Driver Enable and Disable Times

f = 1MHz; t_R≤ 10ns; t_F≤ 10ns

+

–

V_OD2

A – B

V_OD2

0V

INPUT

V_OH

RECEIVER OUT

V_OL

1.5V

OUTPUT

t_PHL

t_PLH

Figure 7. Receiver Propagation Delays

+3V

1.5V

RE

R

f = 1MHz; t < 10ns; t < 10ns

R

F

0V

5V

t

LZ

ZL

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

SP522DS/07

SP522 Multi–Mode Serial Transceivers

7

PINOUT (24-PIN SOIC & SSOP)

1

2

24

23

22

21

20

19

18

17

16

15

14

13

R1OUT

LATCH_EN

ENR2

R2OUT

LOOPBCK

VSS

SP522

3

4

ENT2

ENR1

ENT1

DP1

DP0

T2IN

T1IN

VDD

5

R2INA

R2INB

R1INA

R1INB

T2OUTB

T2OUTA

GND

6

7

8

9

10

11

12

T1OUTA

T1OUTB

VCC

PINOUT (44-PIN QFP)

1

2

33

32

31

30

29

28

27

26

25

24

23

GND

VCC

ENT4

DP1

DP0

LATCH_EN

VSS

VDD

TIN4

TIN3

TIN2

TIN1

3

R1INA

R1INB

R2INA

R2INB

R3INA

R3INB

R4INA

R4INB

T4OUTB

4

5

6

SP524

7

8

9

10

11

LOOPBCK

SP522DS/07

SP522 Multi–Mode Serial Transceivers

8

FEATURES

functionality of the drivers are set up to accom-

modate the selected interface mode. As the

mode of the drivers is changed, the electrical

characteristics will change to support the

required signal levels. The mode of each driver

in the different interface modes that can be

selected is shown in Figures 10 to 13.

The SP522 and SP524 is a highly integrated

serial transceiver that offers programmability

between interface modes through software con-

trol. The SP522 and SP524 offers the hardware

interface modes for RS-232 (V.28), RS-422A

(V.11), RS-423 (V.10), and RS-485. The inter-

face mode selection is done via two control

pins. The SP522 contains two (2) independent

drivers and two (2) independent receivers. The

SP524 is basically two SP522 functions on one

silicon, thus having four (4) drivers and four (4)

receivers.

There are three basic types of driver circuits —

RS-232, RS-423, and RS-485.

TheRS-232driversoutputsingle–endedsignals

with a minimum of +5V (with 3KΩ and 2500pF

loading), and can operate up to 120Kbps. The

RS-232 drivers are used in RS-232 mode for all

signals, and also in V.35 mode where they are

used as the control line signals such as DTR and

RTS.

The SP522/SP524 is ideally suited for low-cost

wideareanetworkconnectivityandothermulti-

protocol applications. Based on our previous

multi-mode SP500 family, Sipex has allocated

specific transceiver cells or "building blocks"

from the SP503 and created the SP522. The

"building block" concept is that these small

transceiver cells can be packaged to offer a

simple low-cost solution to networking appli-

cations that need only two to four interface

modes. The SP522 can be connected in series

to build multiple channels needed for the spe-

cific application. Sipex has conveniently

doubled the SP522 transceiver cell into the

SP524 on a single silicon. For example in a 8-

channel application requiring eight transceiv-

ers, the design can be implemented using two

SP524 devices. The SP522 and SP524 can also

be implemented in series with our SP500 fam-

ily. An application needing 9-channels can use

the SP504 containing seven (7) transceivers

with the SP522.

The RS-423 drivers are also single–ended

signals with a minimum voltage output of

+3.6V (with 450Ω loading) and can operate up

to 120Kbps. Open circuit V_OLand V_OH

measurements are +4.0V to +6.0V when

supplying +5V to V_DDand V_SS. The RS-423

drivers can be used in RS-449, EIA-530, EIA-

530A and V.36 applications as Category II

signals from each of their corresponding

specifications.

The third type of driver produces a differential

signal that can maintain RS-485, +1.5V differ-

ential output levels with a worst case load of

54Ω. The signal levels and drive capability of

the RS-485 drivers allow the drivers to also

support RS-422 (V.11) requirements of +2V

differential output levels with 100Ω loads. The

RS-422 drivers can be used in RS-449,

EIA-530, EIA-530A and V.36 applications as

Category I signals which are used for clock and

data.

THEORY OF OPERATION

The SP522 and SP524 are simply made up of

thedrivers, receivers, anddecoder. Thedevices

operate on three (3) power supplies; V_CCat

+5V, V_DDat +10V , and V_SSat –10V. Each of

these circuit blocks are described in more detail

below.

Thedriversalsohaveseparateenablepinswhich

makestheSP522/SP524helpfulforhalf-duplex

applications. The enable pins will tri-state the

drivers when the ENT1 and ENT2 pins are at a

logiclow("0"). FortheSP524, ENT3andENT4

are used for the two additional drivers. During

tri-stated conditions, the driver outputs will be

at a high impedance state.

Drivers

The SP522 has two (2) enhanced independent

drivers. Control for the mode selection is done

via a two–bit control word into DP0 and DP1.

The drivers are pre-arranged such that for each

mode of operation, the relative position and

SP522DS/07

SP522 Multi–Mode Serial Transceivers

9

Unused driver inputs can be left floating; pull–

up resistors to +5V is internally connected on

the inputs so that the output is at a logic low

("0"). For differential drivers, the non-inverting

output will be at a logic high ("1").

All receivers include a fail-safe feature that

output a known logic state when the receiver

inputs are unconnected. For single-ended

RS-232 receivers, there are internal 5kΩ pull-

down resistors on the inputs which produces a

logic high ("1") at the receiver outputs. The

single-ended RS-423 receivers produce a logic

low ("0") on the output when the inputs are

open. This is due to a pull-up device connected

to the input. The differential receivers have the

same internal pull-up device on the non-inverting

input which produces a logic high ("1") at the

receiver output.

Receivers

The SP522 has two (2) independent receivers

which can be programmed for the different

interface modes. Control for the mode selection

is done by DP0 and DP1.

Like the drivers, the receivers are pre-arranged

forthespecificrequirementsoftheinterface. As

the operating mode of the receivers is changed,

the electrical characteristics will change to

support the required interface. Figures 10 to 13

show the mode of each receiver in the different

interface modes that can be selected.

The receivers also have enable pins which allow

for convenient half-duplex configurations. The

receivers are tri-stated when the ENR1 and

ENR2 pins are at a logic high ("1"). For the

SP524, ENR3 and ENR4 are used for the

additional two receivers.

There are three basic types of receiver circuits

— RS-232, RS-423, and RS-485.

In addition to the separate enable lines on each

transceiver, there is a latch enable pin,

LATCH_EN, which is used for enabling and

disablingthedecodercontrolinputs(DP0, DP1)

and transceiver enable pins. This pin will

default to a logic high ("1") if not being used.

The RS-232 receiver is a single–ended input

with a threshold of 0.8V to 3.0V. The RS-232

receiver has an operating voltage range of +15V

and can receive signals up to 120Kbps. The

inputsensitivitycomplieswithEIA-RS-232and

V.28 at +3V to -3V. The input impedance is

3kΩ to 7kΩ.

Loopback

The SP522 and SP524 contain a loopback fea-

ture that allows the driver outputs to "loopback"

to the receiver inputs for diagnostic testing in

the application. The loopback function is

activatedwhentheLOOPBCKpinislow. When

in loopback mode, the driver outputs are

tri-stated and the receiver inputs are deactivated.

Thereceiverinputimpedancewhileinloopback

will be a minimum of 12kΩ. The loopback

function can be initiated during any mode of

operation, RS-232, RS-423 or RS-422. The

travel path of the transceivers in loopback is

shown on Figure 9. The loopback function

overridestheseparateenablepinsforthedrivers

or receivers. When LOOPBCK is at a logic low

("0"), the device will be configured in loopback

regardless whether the transceiver is enabled or

disabled. If the loopback function is not

required, the LOOPBCK pin will default to a

logic high ("1") state.

The RS-423 receivers are also single–ended but

have an input threshold as low as +300mV. The

inputimpedanceisguaranteedtobegreaterthan

4KΩ, with an operating voltage range of +7V.

TheRS-423receiverscanoperateupto120Kbps.

RS423receiverscanbeusedinRS-449,EIA530,

EIA-530A and V.36 applications as Category II

signals as indicated by their corresponding

specifications.

The third type of receiver is a differential which

supports RS-485. The RS-485 receiver has an

input impedance of 15KΩ and a differential

threshold of +300mV. Since the characteristics

of an RS-422 (V.11) receiver are actually

subsets of RS-485, the receivers for RS-422

requirementsarecoveredbytheRS-485receivers.

RS-422 receivers are used in applications for

RS-449, EIA530, EIA-530A and V.36 as

Category I signals for receiving clock, data, and

some control line signals. The differential

receivers can receive data up to 10Mbps.

SP522DS/07

SP522 Multi–Mode Serial Transceivers

10

+5V

VDD

IN5819

10µF

VSS

10µF

+5V

V

DD

+

28

14

19

29

2

1N5819

VSS

VCC

VCC VCC

VDD

V

SS

SP524

10µF

LATCH_EN

30

31

DP0

10µF

+

DECODER LOGIC

21

13

22

32

LOOPBCK

23

DP1

V

SS

V

CC

V

DD

SP522

T1OUTA

22

LATCH_EN

2

24

T1IN

36

8

DP0

T1

T1OUTB

20

DECODER LOGIC

7

LOOPBCK

23

ENT1

T2OUTA

18

DP1

25

T2IN

35

T2

R1

T2OUTB

17

R1INA

3

R1INB

T1OUTA

11

ENT2

44

R1OUT

40

10

T1IN

6

T1

T1OUTB

12

4

ENT1

R2INA

ENR1

43

R2OUT

39

T2OUTA

15

5

9

T2IN

4

ENT2

1

R1OUT

R2

R2INB

T2

R1

T2OUTB

16

R1INA

18

R1INB

17

6

ENR2

T3OUTA

16

26

T3IN

34

5

T3

T3OUTB

15

R2INA

20

R2INB

ENR1

24

R2OUT

ENT3

R2

T4OUTA

13

19

27

T4IN

33

ENT4

42

R3OUT

38

3

T4

R3

T4OUTB

11

R3INA

ENR2

14

GND

7

R3INB

8

R4INA

ENR3

41

R4OUT

37

9

R4

R4INB

10

ENR4

GND

1

GND

21

GND

12

Figure 9. Typical Operating Circuit, SP522 and SP524

SP522DS/07

SP522 Multi–Mode Serial Transceivers

11

MODE: RS232

DP0

DRIVER

RECEIVER

DP0

1

DP1

0

DP1

1

0

SP522

R1INA (18)

T1IN (10)

T1OUTA (11)

R1OUT (1)

R2INA (20)

T2IN (9)

R2OUT (24)

T2OUTA (15)

RECEIVERS

DRIVERS

SP524

T1IN (24)

R1INA (3)

T1OUTA (22)

R1OUT (44)

T2IN (25)

R2INA (5)

R2OUT (43)

R3INA (7)

T2OUTA (18)

T3IN (26)

T3OUTA (16)

R3OUT (42)

T4IN (27)

R4INA (9)

T4OUTA (13)

R4OUT (41)

RECEIVERS

DRIVERS

LATCH_EN

LOOPBCK

ENT

X

ENR

X

1

Figure 10. Mode Diagram — RS232

SP522DS/07

1

0

SP522 Multi–Mode Serial Transceivers

12

MODE: RS423

DP0

DRIVER

RECEIVER

DP0

1

DP1

1

DP1

1

SP522

R1INA (18)

T1IN (10)

T1OUTA (11)

R1OUT (1)

R2INA (20)

T2IN (9)

R2OUT (24)

T2OUTA (15)

RECEIVERS

DRIVERS

SP524

T1IN (24)

R1INA (3)

T1OUTA (22)

R1OUT (44)

T2IN (25)

R2INA (5)

R2OUT (43)

R3INA (7)

T2OUTA (18)

T3IN (26)

T3OUTA (16)

R3OUT (42)

T4IN (27)

R4INA (9)

T4OUTA (13)

R4OUT (41)

RECEIVERS

DRIVERS

LATCH_EN

LOOPBCK

ENT

X

ENR

X

1

Figure 11. Mode Diagram — RS423

SP522DS/07

1

0

SP522 Multi–Mode Serial Transceivers

13

MODE: RS422/485

DRIVER

RECEIVER

DP0 DP1

DP0

0

DP1

1

0

1

SP522

R1INA (18)

R1OUT (1)

R1INB (17)

R2INA (20)

T1IN (10)

T1OUTA (11)

T1OUTB (12)

T2IN (9)

R2OUT (24)

R2INB (19)

T2OUTA (15)

T2OUTB (16)

RECEIVERS

DRIVERS

LATCH_EN

LOOPBCK

ENT

1

X

ENR

X

1

0

Figure 12. Mode Diagram — RS422/RS485 for the SP522

SP522DS/07

SP522 Multi–Mode Serial Transceivers

14

MODE: RS422/485

DRIVER

RECEIVER

DP0 DP1

DP0

0

DP1

1

0

1

SP524

R1INA (3)

R1OUT (44)

R1INB (4)

T1IN (24)

T1OUTA (22)

T1OUTB (20)

R2INA (5)

T2IN (25)

R2OUT (43)

T2OUTA (18)

T2OUTB (17)

R2INB (6)

R3INA (7)

R3OUT (42)

R3INB (8)

R4INA (9)

T3IN (26)

T3OUTA (16)

T3OUTB (15)

T4IN (27)

R4OUT (41)

R4INB (10)

T4OUTA (13)

T4OUTB (11)

RECEIVERS

DRIVERS

LATCH_EN

LOOPBCK

ENT

1

X

ENR

X

1

0

Figure 13. Mode Diagram — RS422/RS485 for the SP524

SP522DS/07

SP522 Multi–Mode Serial Transceivers

15

APPLICATIONS INFORMATION

can be programmed to RS-422 whereas a SP524

can be added and programmed to RS-423, thus

creating seven RS-422 channels and four

RS-423 channels. The SP504 and the SP522/

SP524 can be configured to custom fit the

various serial port application needs.

DCE-DTE Applications

A serial port can be easily configured for DTE

and DCE using multiple SP522 and/or SP524

parts. As shown on Figure 14, the transceivers

are half-duplexed to provide convenient DCE-

DTE capability. The driver outputs are con-

nected to the receiver inputs with only one pair

out to the serial port for each driver/receiver.

When the driver is tri-stated by applying a logic

low ("0") to ENT, the receivers can be active to

receive the appropriate input. The driver output

during tri-state is high impedance, therefore

will not degrade the signal levels of the receiver

input signal. When the receiver is tri-stated by

applying a logic ("1") to ENR, the driver output

is active to drive the appropriate signal without

interference from the receiver. The receiver

inputs are at least 12kΩ to ground during tri-state.

+5V Only Operation Using the SP782

The SP522 and SP524 use external +10V or

+5V voltage supplies for power to maintain the

RS-232andRS-423voltagelevels,respectively.

However, if a low-cost +5V solution if pre-

ferred, the SP522 and SP524 can be configured

with the SP782 or SP784 programmable charge

pump. TheSipexpatent-pendingprogrammable

charge pumps offer +10V or +5V outputs. The

programmability is used for switching from

RS-232usingthe +10VoutputstoRS-423using

the +5V outputs. The SP782 requires 0.1µF

capacitorsandtheSP784requires10µFcapacitors

for the charge pump. Please refer to the SP782

andSP784data sheet fordetailsonthe program-

mable charge pump.

Configuring Additional Multi-Protocol

Transceivers

Serial ports usually can have two data signals

(SD, RD), three clock signals (TT, ST, RT), and

at least eight control signals (CS, RS, etc.).

EIA-RS-449 contains twenty six signal types

including for a DB-37 connector. A DB-37

serial port design may require thirteen drivers

and fourteen receivers. Although many

applications do not use all these signals, some

applications may need to support extra

functions such as diagnostics. Sipex's SP504

supports enough transceivers for the primary

channels of data, clock and control signals.

Configuring LL, RL and TM may require two

additional drivers and one receiver if designing

for a DTE (one driver and two receivers for a

DCE).

Achieving +10V with +12V Supplies

Since the SP522 and SP524 use external +10V

supplies, systems that have +12V supplies must

be regulated down to +10V. This can be simply

configured by placing diodes in series with the

V_DDand V_SSlines. The absolute maximum

supplyvoltageis+12V.Sincemost+12Vpower

supplies have some voltage tolerances, usually

+10%, any increase above the 12V maximum

will damage the device. However, the +12V

supply may be used providing that the maximum

supply voltages do not exceed the rated absolute

maximum V_SSand V_DD

.

Sequencing of Power Supplies

Power Supplies for the SP522 and SP524 must

be sequenced. The recommended sequence is

V_CCfirst, V_DD50-80µSec later and V_SS100 to

1,000µSec after V_DD. There are no sequencing

requirementsforthe SP522orSP524whenthey

are powered from either the SP782 or SP784

charge pump devices or from the V_DDand V_SS

supply pins of the SP504or SP505charge pump

powered devices. For further details, see the

application note, V_DD, V_CCand V_SSPower

Supply Sequencing.

The SP522 and SP524 is a convenient solution

in a design that requires two extra single ended

or differential transceivers. The SP504 and

SP522,showninFigure15,canbeprogrammed

in various configurations. The SP504 is

programmed for RS-449 mode. By connecting

the decoder pins of the SP504 to the DP0 and

DP1pinsaccordingly,theSP522isprogrammed

in RS-423 mode. This adds two single ended

transceiverstotheapplication. Forapplications

needing more than five RS-422 transceivers or

morethanthreeRS-423transceivers, theSP504

SP522DS/07

SP522 Multi–Mode Serial Transceivers

16

+5V

+10V

+

10µF

13

10µF

21

V

DP1

V

DD

CC

7

8

2

–10V

22

V

SS

SP522

10µF

DP0

+

LATCH_EN

11

12

10

6

18

17

1

5

15

16

9

4

20

19

24

3

LOOPBCK

14

6

GND

+5V

+10V

+

10µF

2

14

CC

28

19

V

DD

32

–10V

29

DP1

V

SS

31

30

SP524

10µF

DP0

+

LATCH_EN

22

20

24

36

3

4

44

40

18

17

25

35

5

6

43

39

16

15

26

34

7

8

42

38

13

11

27

33

9

41

37

10

23

LOOPBCK

GND GND

GND

1

12

21

Figure 14. DTE/DCE Application with the SP522 and SP524

SP522DS/07

SP522 Multi–Mode Serial Transceivers

17

1N5819

22µF 22µF

+

22µF

+5V

+

various VCC

supply pins

+

27 26 30

V_DD

28 31

C1+ C1- C2+ C2-

10µF

V_CC

+

22µF

32

V_SS

DB-37 Connector

SP504CF

61

59

58

56

54

52

63

65

42

44

47

45

51

49

70

Drivers

TxD

14

4

22

12

30

7

DTR

13

RTS

16

25

TxC

15

17

35

ST

22

CIRCUIT

CIRCUIT NAME

CIRCUIT

TYPE

RL

17

14

10

MNEMONIC

DIRECTION

SG

SIGNAL GROUND

--------------

LL

24

COMMON

CONTROL

SC

RC

IS

SEND COMMON

TO DCE

RECEIVE COMMON

TERMINAL IN SERVICE

INCOMING CALL

FROM DCE

TO DCE

Receivers

6

RxD

1

71

37

IC

FROM DCE

TO DCE

24

8

TR

DM

SD

RD

TT

TERMINAL READY

DATA MODE

RxC

20

38

66

FROM DCE

TO DCE

26

9

SEND DATA

DATA

CTS

80

RECEIVE DATA

FROM DCE

TO DCE

67

68

27

11

29

13

31

15

TERMINAL TIMING

SEND TIMING

ST

FROM DCE

TO DCE

TIMING

DSR

78

69

35

RT

RS

CS

RR

SQ

NS

SF

RECEIVE TIMING

REQUEST TO SEND

CLEAR TO SEND

RECEIVER READY

SIGNAL QUALITY

NEW SIGNAL

DCD

19

FROM DCE

TO DCE

36

39

RI

CONTROL

40

76

21

SELECT FREQUENCY

SIGNAL RATE SELECTOR

SIGNAL RATE INDICATOR

SECONDARY SEND DATA

SECONDARY RD

SECONDARY RS

SECONDARY CS

SECONDARY RR

LOCAL LOOPBACK

REMOTE LOOPBACK

TEST MODE

TO DCE

SCT

79

5

SR

SI

TO DCE

77

FROM DCE

TO DCE

23

SSD

SRD

SRS

SCS

SRR

LL

DATA

Tied toTDEC0

Tied toTDEC1

RDEC0

RDEC1

RDEC2

RDEC3

0

TDEC0

TDEC1

FROM DCE

TO DCE

2

3

12

11

0

CONTROL

FROM DCE

TO DCE

1

TDEC2

TDEC3

4

5

10

9

1

CONTROL

RL

TO DCE

see pinout diagram for various ground pins

TM

SS

SB

FROM DCE

TO DCE

SELECT STANDBY

STANDBY INDICATOR

FROM DCE

RS-449 Interchange Circuits Table

+5V

+

10µF

13

21

V

DP1

V

DD

CC

7

8

–5V

22

V

SS

SP522

10µF

DP0

+

2

LATCH_EN

10

11

6

RS-423 Outputs

9

15

4

1

5

20

RS-423 Inputs

18

24

3

LOOPBCK

GND 14

Figure 15. Adding extra channels using the SP522 and SP504

SP522DS/07

SP522 Multi–Mode Serial Transceivers

18

PACKAGE: PLASTIC

SMALL OUTLINE (SOIC)

(WIDE)

E

H

D

A

Ø

A1

L

e

B

DIMENSIONS (Inches)

Minimum/Maximum

(mm)

24–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)

0.599/0.614

(15.20/15.59)

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°)

SP522DS/07

SP522 Multi–Mode Serial Transceivers

19

PACKAGE: PLASTIC SHRINK

SMALL OUTLINE

(SSOP)

E

H

D

A

Ø

A1

L

e

B

DIMENSIONS (Inches)

Minimum/Maximum

(mm)

24–PIN

A

A1

B

D

E

0.068/0.078

(1.73/1.99)

0.002/0.008

(0.05/0.21)

0.010/0.015

(0.25/0.38)

0.317/0.328

(8.07/8.33)

0.205/0.212

(5.20/5.38)

e

0.0256 BSC

(0.65 BSC)

H

L

0.301/0.311

(7.65/7.90)

0.022/0.037

(0.55/0.95)

Ø

0°/8°

(0°/8°)

SP522DS/07

SP522 Multi–Mode Serial Transceivers

20

PACKAGE: 44-PIN FLATPACK

D

D₁

0.30" RAD. TYP.

1

0.20" RAD. TYP.

C

L

1

-A-

-B-

Standoff

A₁

6°±4°

.25

A

Seating

Plane

-D-

-C-

E₁

ø

L

b

Lead

Coplanarity

ccc

E

0.17 MAX.

10˚ TYP.

C

L

C

N

A₂

A

1

e

A₁

Another variation of Pin 1 Visual Aid

FOOTPRINT (BODY +)

3.20 mm

44L

DIMENSIONS

mm

MAX.

A

2.45

A

MIN.

0.25

1

+0.10/-0.05

±0.25

2.00

2

D

13.20

10.00

13.20

10.00

0.65

D

1

±0.10

E

±0.25

E

±0.10

1

L

+0.15/-0.10

BASIC

±0.05

e

b

0.80

0.35

ø

ddd

ccc

0.20 NOM.

0.10

MAX.

SP522DS/07

SP522 Multi–Mode Serial Transceivers

21

ORDERING INFORMATION

Model

Temperature Range

Package Types

SP522CT ........................................................................... 0°C to +70°C .............................................................................................. 24-pin SOIC

SP522CA .......................................................................... 0°C to +70°C ............................................................................................. 24-pin SSOP

SP524CF ........................................................................... 0°C to +70°C ............................................................................................... 44-pin QFP

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.

SP522DS/07

SP522 Multi–Mode Serial Transceivers

22


型号：	SP522CF
厂家：	SIPEX CORPORATION
描述：	Telecom IC,
文件：	总22页 (文件大小：293K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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