SP3244E_技术文档

SP3244E-SP3245E

3.0V to 5.5V RS-232 Transceivers with Auto On-Line® Plus

FEATURES

• Contains 3-Drivers and 5-Receivers;

Single-chip DTE (PC or terminal) serial port transceiver

• Auto On-line^®Plus

• SP3244E slew-controlled to 250Kbps under load

C2+

C2-

V-

C1+

V+

28

27

26

1

2

3

• SP3245E 1Mbps data rate for high-speed RS-232

• Meets true EIA/TIA-232-F and ITU V.28 standards

from a +3.0V to +5.5V power supply

• Adheres to EIA/TIA-562 for interoperability

with EIA/TIA-232 down to a +2.7V supply voltage

• Regulated charge pump yields stable RS-232

outputs regardless of VCC variations

• ESD Speciﬁcations:

VCC

GND

R1IN

25

24

23

4

5

6

R2IN

R3IN

C1-

SP3244E

SP3245E

ONLINE

SHUTDOWN

±15KV Human Body Model

±15KV IEC1000-4-2 Air Discharge

± 8KV IEC1000-4-2 Contact Discharge

22

R4IN 7

STATUS

R2OUT

R1OUT

R2OUT

R3OUT

R4OUT

21

20

19

18

R5IN

8

9

T1OUT

T2OUT 10

T3OUT 11

APPLICATIONS

• Portable RS-232

17

16

15

T3IN

12

T2IN 13

T1IN

• Laptops and handheld PCs and PDA

• Cellular telephones, datacables, chargingcradles

• Diagnostic/uploadportsonembeddedapplications

• Use in conjunction with low-voltage UART or

microcontroller

R5OUT

14

•SP3244Eiscross-compatiblewithMAX3244E,

ICL3244E

•SP3245Eiscross-compatiblewithMAX3245E,

ICL3245E

DESCRIPTION

The SP3244E/3245E is a 3-driver/5-receiver device ideal for mobile phone, consumer and PDA

applications. These devices use an internal high-efﬁciency, charge-pump power supply that requires

only 0.1µF capacitors for 3.3V single-supply operation. This charge pump and Sipex’s driver archi-

tecture allow the SP3244E/3245E to deliver compliant RS-232 performance from a power supply

ranging from +3.0V to +5.5V. At voltages between +2.7V and +3.0V the driver outputs are compliant

with RS-562 and can interface to RS-232 in portable applications.

The Auto On-line^®Plus feature allows the device to automatically enter a low power shutdown

mode if all receiver and driver inputs have been idle for 30 seconds. The device will “wake-up” from

this automatic shutdown state upon detecting activity. This power saving feature functions without

system intervention or modiﬁcations to software or drivers.

SP3244E supports serial data rates of 250kbps minimum under full load and while maintaining

slew rates of less than 30V/µs. SP3245E is capable of high speed communication of up to 1Mbps.

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

1

PIN ASSIGNMENTS

PIN NUMBER

NAME

FUNCTION

(T)SSOP

QFN

29

30

31

1

C2+

C2-

Positive terminal of the inverting charge pump capacitor.

Negative terminal of the inverting charge pump capacitor.

Regulated -5.5V output generated by the charge pump.

RS-232 receiver input.

1

2

V-

3

R1IN

4

R2IN

RS-232 receiver input.

5

2

R3IN

RS-232 receiver input.

6

3

R4IN

RS-232 receiver input.

7

4

R5IN

RS-232 receiver input.

8

5

T1OUT

T2OUT

T3OUT

T3IN

RS-232 driver output.

9

6

RS-232 driver output.

10

11

12

13

14

15

16

17

18

19

20

21

7

RS-232 driver output.

8

TTL/CMOS driver input.

10

11

12

13

14

15

17

18

19

20

T2IN

TTL/CMOS driver input.

T1IN

TTL/CMOS driver input.

R5OUT

R4OUT

R3OUT

R2OUT

R1OUT

R2OUT

STATUS

TTL/CMOS receiver output.

Non-inverting receiver 2 output; active in shutdown.

Status output.

Forced SHUTDOWN input. Drive low to shut down drivers, receivers

®

SHUTDOWN

ONLINE

and charge pump. Will override Auto On-line Plus. Do not leave this

pin open.

22

23

21

22

®

Auto On-line input. Active low enabled automatic power saving

feature. Equivalent to competitor's FORCEON pin. Do not leave this

pin open.

C1-

GND

VCC

V+

Negative terminal of the voltage doubler charge pump capacitor.

Ground connection.

24

25

26

27

28

23

24

26

27

28

Device power supply pin (3.0V to 5.5V).

Regulated +5.5V output generated by the charge pump.

Positive terminal of the voltage doubler charge pump capacitor.

C1+

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

2

ABSOLUTE MAXIMUM RATINGS

SSOP-28, øJA = 67.1ºC/W

V+ (Note 1)......................................-0.3V to + 7.0V TSSOP-28, øJA = 83.6ºC/W

Supply Voltage (Vcc).......................-0.3V to + 6.0V

V- (Note 1).......................................+0.3V to - 7.0V

|V+| + |V-| .......................................................+13V

Input voltage at TTL input pin.. -0.3V toVCC +0.3V

RxIN..............................................................+/-18V

Driver output (from Ground)...................... +/-13.2V

RxOUT, STATUS.....................-0.3V to VCC + 0.3V

Short Circuit Duration, TxOUT to GND, Continuous

(One output at a time maximum)

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

OperatingTemperature SP324XECX................0°Cto+70°C

OperatingTemperature SP324XEEX...........-40°Cto+85°C

Lead Temperature (soldering, 10s)..............+300°C

QFN- 32, øJA= 22.4ºC/W

These are stress ratings only and functional

operation of the device at these ratings or

any other above those indicated in the opera-

tion sections of the speciﬁcations below is not

implied. Exposure to absolute maximum rating

conditions for extended periods of time may

affect reliability.

NOTE 1: V+ and V- can have maximum

magnitudes of 7V, but their absolute difference

cannot exceed 13V.

ELECTRICAL CHARACTERISTICS

Unless otherwise noted VCC = +3.0V to +5.5V, TAMB = TMIN to TMAX, C1–C4 = 0.1µF.

Typical values are at TAMB = +25°C, VCC = 3.3V.

PARAMETERS

SYMB

TEST CONDITIONS

MIN.

TYP.

MAX.

UNIT

DC CHARACTERISTICS

Receivers idle, TxIN = Vcc or GND,

ONLINE = GND, SHUTDOWN = Vcc

Note 1

Supply Current,

ICC3

1

10

µA

Auto On-Line^®Plus

Supply Current, Shutdown

ICC2

ICC1

SHUTDOWN = GND

1

10

5

µA

ONLINE = SHUTDOWN = Vcc, No

Load

Supply Current, Active

mA

Driver Input and Logic Input Pins:

Vcc = 3.3V

Vcc = 5.0V

2

High

VIH

Logic

Input

Voltage

2.4

V

Low

VIL

VT

IIL

0.8

Logic Threshold

1.5

Logic Input Leakage Current

Logic Input Hysteresis

0.01

±1.0

µA

VHYS

100

mV

Receiver Outputs and STATUS Output

Receiver Output Voltage Low

Receiver Output Voltage High

VOL

IOUT = -1.6mA

IOUT = 1mA

0.4

±1

V

VCC

-0.6

VOH

IOZ

Receivers disabled.

0.4V < VO < 5.5V

Receiver Output Leakage Current

±0.02

µA

Note 1: Characterized, not 100% tested.

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

3

ELECTRICAL CHARACTERISTICS

Unless otherwise noted VCC = +3.0V to +5.5V, TAMB = TMIN to TMAX, C1–C4 = 0.1µF.

Typical values are at TAMB = +25°C, VCC = 3.3V.

PARAMETERS

Receiver Inputs

SYMB

TEST CONDITIONS

MIN.

TYP.

MAX.

UNIT

Input Voltage Range

Input Threshold Low

-15

+15

V

VCC = 3.3V

0.6

0.8

1.0

1.2

1.7

200

4.5

VCC = 5.0V

VCC = 3.3V

VCC = 5.0V

Input Threshold High

2.4

V

Input Hysteresis

Input Resistance

Driver Outputs

mV

kΩ

TA = 25ºC

3

7

Output Voltage Swing

VO

All transmitter outputs loaded with

3kΩ to GND

±5.0

±5.6

10M

V

Output load = Open Circuit

Vout = 0V

±15.0

±60

Short Circuit Current

Power-Off Impedance

mA

Ω

VCC = V+ = V- = 0, transmitter

outputs = ±2V

300

Output Leakage Current

Mouse Drivability

VCC = 0 or 3V to 3.3V, VOUT = ±12V,

Drivers disabled

±25

µA

V

T1IN = T2IN = GND, T3IN = VCC,

T3 loaded with 3kΩ to GND, T1OUT

and T2OUT loaded with 2.5mA each

±5.0

ESD Protection

IEC 1000-4-2 Air Discharge

±15

±8

ESD Protection for RxIn, TxOut

pins

IEC 1000-4-2 Contact Discharge

kV

Human Body Model

±15

±2

All Other Pins

®

Auto On-line Plus (ONLINE = GND, SHUTDOWN = Vcc)

Rx Input Threshold to

STATUS Output High

±2.7

V

Rx Input Threshold to

STATUS Output Low

±0.3

Threshold to STATUS High

Threshold to STATUS Low

tSTH

tSTL

0.4

30

µs

Rx or Tx Transition to

Drivers Enabled

tONLINE

100

30

µs

Last Rx or Tx Transition to Driv-

ers Disabled

tOFFLINE

Note 1

15

60

sec

Note 1: Characterized, not 100% tested.

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

4

TIMING CHARACTERISTICS

Unless otherwise noted VCC = +3.0V to +5.5V, TAMB = TMIN to TMAX, C1–C4 = 0.1µF. Typical values are

at TAMB = +25°C, VCC = 3.3V.

PARAMETERS

SP3244E

SYMBOL

TEST CONDITIONS

MIN.

TYP.

MAX.

UNIT

Maximum Data Rate

RL = 3kΩ, CL = 1000pF. One

transmitter switching.

250

kbps

ns

Driver Propagation Delay

tDPHL, tDPLH

CL=1000pF

1600

Transition-Region Slew Rate

RL=3kΩ to 7kΩ, CL=150pF to

1000pF, measurements taken

from +3V to -3V or from -3V to

+3V.

4

30

V/µs

Driver Skew

|tDPHL - tDPLH| at zero crossing

RIN to ROUT, CL = 150pF

50

ns

Receiver Propagation Delay

Receiver Output Enable Time

Receiver Output Disable Time

Receiver Skew

tRPHL,tRPLH

tRZH , tRZL

tRZH , tRLZ

0.15

0.04

0.1

µs

ns

2.0

|tPHL - tPLH| at 1.5V

40

SP3245E

Maximum Data Rate

RL = 3kΩ, CL = 250pF. One

transmitter switching.

1000

500

kbps

RL = 3kΩ, CL = 1000pF. One

transmitter switching.

kbps

ns

Driver Propagation Delay

tDPHL, tDPLH

CL=250pF

700

Transition-Region Slew Rate

RL=3kΩ to 7kΩ, CL=150pF to

250pF, measurements taken from

+3V to -3V or from -3V to +3V.

24

150

V/µs

Driver Skew

|tDHPL - tDPLH| at zero crossing

RIN to ROUT, CL = 150pF

100

0.15

0.05

0.1

ns

µs

ns

Receiver Propagation Delay

Receiver Output Enable Time

Receiver Output Disable Time

Receiver Skew

tRPHL,tRPLH

tRZH , tRZL

tRZH , tRLZ

2.0

|tPHL - tPLH| at 1.5V

90

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

5

TYPICAL PERFORMANCE CHARACTERISTICS

400

350

300

250

200

150

100

3

2.5

2

1.5

1

0.5

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

-55

-30

-5

20

45

70

95

Load Capacitiance (pF)

Temperature (ºC)

Turn on Time vs. Temperature

Transmitter Input to Receiver Output Propaga-

tion Delay vs. Load Capacitance

40

35

30

25

20

15

10

5

30

25

20

15

10

5

1Mbps

250kbps

0

500 1000 1500 2000 2500 3000 3500 4000 4500 5000

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

Load Capacitiance (pF)

ICC vs. Load Capacitance

Transmitter Output Slew Rate vs. Load Capaci-

tance

400

350

300

6

5

V+

4

3

2

250

3245, 1Mbps

1

0

200

150

-1

-2

-3

-4

-5

-6

3244, 250kbps

100

V-

50

0

500 1000 1500 2000 2500 3000 3500 4000 4500 5000

Load Capacitiance (pF)

0

250 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500

Load Capacitance (pF)

Transmitter Skew vs. Load Capacitance

Transmitter Output vs. Load Capacitance

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

6

TYPICAL PERFORMANCE CHARACTERISTICS

SP3244E C2+ Charge Pump Waveforms - Vcc=3.3V,

All channels switching

SP3244E Charge Pump Levels Out of Shut-

down

SP3244E Charge Pump Levels Into Shut-

down

SP3244E C2+ Charge Pump Waveforms -

Vcc=5.0V, All channels switching

SP3244E Charge Pump Power On

TimeVcc=3.3V, T=27C

SP3244E Charge Pump Waveforms for

250kbps Clock Rate

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

7

TYPICAL PERFORMANCE CHARACTERISTICS

SP3244E Waveforms for 250kpbs Clock Rate

RL=3kΩ CL=4700pF

SP3244E Charge Pump Power On Time

- Vcc=3.3V, T=85ºC

SP3244E Charge Pump Power On Time

- Vcc=3.3V, T=-40C

SP3245E Waveforms for 1Mbps Clock Rate

RL=3kΩ CL=1000pF

SP3244E Waveforms for 250kpbs Clock Rate

RL=3kΩ CL=1000pF

SP3245E Waveforms for 1Mbps Clock Rate

RL=3kΩ CL=50pF

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

8

TYPICAL PERFORMANCE CHARACTERISTICS

SP2345 Waveforms for 1Mbps Clock Rate

- RL=3k, CL=250pF

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

9

DESCRIPTION

(EIA RS-232D 2.1.7, Paragraph 5). The slew

rate of SP3245E is not limited to enable higher

speed data transfers. The transition of the

loaded output from HIGH to LOW also meets

the monotonic signal transition requirements of

the standard.

The SP3244E and SP3245E are 3-driver/5-re-

ceiver devices ideal for serial ports in battery-

powered, portable, or handheld applications

such as notebook or handheld computers.

SP3244E/3245E transceivers meet the EIA/

TIA-232 and ITU-T V.28/V.24 communication

protocols for reliable serial communication.

The SP3244E/3245E devices feature Sipex’s

proprietary and patented (U.S. 5,306,954)

on-board charge pump circuitry that generates

±5.5V RS-232 voltage levels from a single

+3.0V to +5.5V power supply.

Receivers

The receivers convert EIA/TIA-232 signal

levels to TTL or CMOS logic output levels. Re-

ceivers remain active unless the device is put

into manual shutdown using the SHUTDOWN

pin. The non-inverted output of Receiver

2 (R2OUT) will continue to be active in all

modes, including shutdown.

The SP3244E/3245E is an ideal choice

for power sensitive designs. With the Auto

On-line^®Plus enabled the SP3244E/3245E

reduces power consumption to a 1µA supply

current whenever the transceivers are idle. In

shutdown, the internal charge pump and the

drivers will shut down. Receivers remain active

unless the device is put into manual shutdown

using the SHUTDOWN pin. This feature allows

design engineers to address power saving

concerns without major design changes.

Since receiver input is usually from a transmis-

sion line where long cable lengths and system

interference can degrade the signal, the inputs

have a typical hysteresis margin of 500mV.

This ensures that the receiver is virtually im-

mune to noisy transmission lines. Should an

input be left unconnected, an internal 5KΩ pull-

down resistor to ground will commit the output

of the receiver to a HIGH state.

Theory Of Operation

The SP3244E/3245E is made up of four basic

circuit blocks:

1. Drivers, 2. Receivers, 3. the Sipex propri-

etary charge pump, and 4. Auto On-line^®Plus

circuitry.

Highly Efﬁcient Charge Pump

The charge pump is used to generate positive

and negative signal voltages for the RS-232

drivers. This enables fully compliant RS-232

and V.28 signals from a single 3.0 or 5.5V

power supply.

Drivers

The charge pumps use four external capaci-

tors to hold and transfer electrical charge. The

Sipex patented design (US Patent #5,306,954)

uses a unique approach compared to older less

efﬁcient designs. The pumps use a four–phase

voltage shifting technique to attain symmetrical

V+ and V- power supplies. An intelligent control

oscillator regulates the operation of the charge

pump to maintain the proper voltages at maxi-

mum efﬁciency.

The drivers are inverting level transmitters that

convert TTL or CMOS logic levels to 5.0V EIA/

TIA-232 levels with an inverted sense relative

to the input logic levels. Typically, the RS-232

output voltage swing is +5.4V with no load and

+5V minimum fully loaded. The driver outputs

are protected against inﬁnite short circuits to

ground without degradation in reliability. These

drivers comply with the EIA/TIA-232-F and

all previous RS-232 versions. Unused driver

inputs should be connected to GND or VCC.

Phase 1

VSS charge store and double. The positive

terminals of capacitors C1 and C2 are charged

from VCC with their negative terminals initially

connected to ground. C1+ is then connected

to ground and the stored charge from C1– is

superimposed onto C2– . Since C2+ is still

connected to VCC the voltage potential across

capacitor C2 is now 2 x VCC.

The SP3244E/3245E devices operate at this

typical data rate when fully loaded. The drivers

can guarantee output data rates fully loaded

with 3KΩ in parallel with 1000pF (SP3244E), or

250pF (SP3245E) ensuring compatibility with

popular PC-to-PC communication software.

The slew rate of the driver output on the

SP3244E is internally limited to a maximum

of 30V/µs in order to meet the EIA standards

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

10

DESCRIPTION

+

V

CC

-

Phase 2 – Vss transfer from C2 to C4.

Meanwhile C1 is charged to Vcc

+

C

+

V+

3

C

2

1

V

-

e

-

e

CC

Phases 1 and 3: Store/Double.

Double charge from C1 onto C2.

C2 is now charged to -2xVcc

-

e

-

+

C

4

Vss

+

C

+

V+

3

Patented 5,306,954 (Sipex, inc.)

+

C

1

2

-

e

-

V-

+

V

CC

C

-

4

Phase 4 VDD

transfer from C2 to C3.

Meanwhile C1 is charged to Vcc

V

e

DD

+

e

+

C

+

V+

3

C

1

2

-

e

V-

+

C

4

Charge Pump Phases

Minimum Recommended Charge Pump Capacitor Values

Input Voltage V^CC

3.0V to 3.6V

Charge Pump Capacitor Value for SP32XX

C1-C4=0.1µF

4.5V to 5.5V

3.0V to 5.5V

C1=0.047µF, C2-C4=0.33µF

C1-C4=0.22µF

Charge Pump Capacitor Values

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

11

DESCRIPTION

surface mount ceramic capacitors (such as are

Phase 2

VSS transfer and invert: Phase two connects

the negative terminal of C2 to the VSS stor-

age capacitor and the positive terminal of C2 to

ground. This transfers the doubled and inverted

(V–) voltage onto C4. Meanwhile, capacitor

C1 charged from VCC to prepare it for its next

phase.

widely used for power-supply decoupling) are

ideal for use on the charge pump. The charge

pumps are designed to be able to function prop-

erly with a wide range of capacitor styles and val-

ues. If polarized capacitors are used the positive

and negative terminals should be connected as

shown on the Typical Operating Circuit.

Phase 3

Capacitance values may be increased if operat-

ing at higher VCC or to provide greater stability as

the capacitors age. See Charge Pump Capacitor

Value table on page 11.

VDD charge store and double: Phase three is

identical to the ﬁrst phase. The positive ter-

minals of capacitors C1 and C2 are charged

from VCC with their negative terminals initially

connected to ground. C1+ is then connected

to ground and the stored charge from C1– is

superimposed onto C2–. Since C2+ is still

connected to VCC the voltage potential across

capacitor C2 is now 2 x VCC.

Auto On-line^®Plus Circuitry

The SP3244E/3245E devices have the advanced

Auto On-line^®Plus feature that saves power by

turning off the charge pumps and driver outputs

when the transceiver inputs are idle for more

than 30 seconds.

Phase 4

VDD transfer: The fourth phase connects the

negative terminal of C2 to ground and the posi-

tive terminal of C2 to the VDD storage capacitor.

This transfers the doubled (V+) voltage onto C3.

Meanwhile, capacitor C1 charged from VCC to

prepare it for its next phase.

RS-232 signals use both positive and negative

voltages of greater than ±5V magnitude. Receiv-

ers have nominal 5kΩ impedance to ground.

Even when idle, drivers will maintain output

signal voltage creating a continuous current

ﬂow. In low power battery operated devices this

constant current drain can decrease battery life

signiﬁcantly.

The Sipex chargepump generates V+ and

V– independently from VCC. Hence in a no–load

condition V+ and V- will be symmetrical. Older

charge pump approaches generate V+ and then

use part of that stored charge to generate V-.

Because of inherent losses the magnitude of V-

will be smaller than V+ on these older designs.

Receiver

5kΩ

Under lightly loaded conditions the intelligent

pump oscillator maximizes efﬁciency by running

only as needed to maintain V+ and V–. Since

interface transceivers often spend much of their

time at idle this power-efﬁcient innovation can

greatly reduce total power consumption. This

improvement is made possible by the indepen-

dent phase sequence of the Sipex charge-pump

design.

Reciever 5kΩ Current path to GND

Auto On-line^®Plus devices may be conﬁgured

to emulate the behavior of devices with our

earlier Auto On-line^®feature. Auto On-line^®

Plus puts the device into a low power mode

when driver and receiver inputs are idle and re-

awakes upon detecting signal transitions. Auto

On-line^®puts the device into a low power mode

when receiver inputs are left ﬂoating and re-

awakes when receivers are driven greater than

±2.7V magnitude by incoming RS-232 signal.

The clock rate for the charge pump typically op-

erates at greater than 70kHz allowing the pump

to run efﬁciently with small 0.1µF capacitors.

Efﬁcient operation depends on rapidly charging

and discharging C1 and C2, therefore capacitors

should be mounted close to the IC and have low

ESR (equivalent series resistance). Inexpensive

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

12

DESCRIPTION

modes, including SHUTDOWN pin at logic 0.

Connecting STATUS output to drive both

ONLINE and SHUTDOWN will wake the trans-

ceiver if any receiver inputs are driven greater

than ±2.7V magnitude and put the transceiver

into Forced Shutdown mode if all receiver

inputs are ﬂoating or driven to ground.

Auto On-line^®Plus provides greater power

savings in typical operation because the trans-

ceiver will go into low power standby mode

unless a communication link is in use. Signals

such as CTS, RTS, DTR, DSR, or RI will typi-

cally change signal-state to establish hand-

shaking before any actual data-communication

takes place. Transitions on these handshake

signals will wake up the Auto On-line^®Plus

transceiver to prepare it for sending data

(tONLINE 100µs typical).

±15KV ESD PROTECTION

ESD-protection structures are incorporated

on all pins to protect against electrostatic

discharges encountered during handling and

assembly. The driver output and receiver inputs

of the SP3244E/3245E have extra protection

against static electricity. Sipex uses state-of-

the-art structures to protect these pins against

ESD of ±15kV without damage. The ESD struc-

tures withstand high ESD in all states: normal

operation, shutdown, and powered down. After

an ESD event, the SP3244E/3245E keep work-

ing without latch-up or damage.

Receivers remain active to detect incoming

signals in Auto On-line^®Plus standby mode.

Receiver outputs may be disabled by enter-

ing manual shutdown by driving SHUTDOWN

pin to logic 0. A special non-inverted receiver

output R2OUT remains active in all modes,

including SHUTDOWN pin at logic 0.

In some applications if there is a signiﬁcant

delay (greater than tOFFLINE) between the

handshaking transitions and the start of data

communication the transceiver may enter

Auto On-Line^®Plus standby mode before data

communication begins. The tOFFLINE interval

is at least 15 seconds and no longer than 60

seconds.

ESD protection can be tested in various ways.

The transmitter outputs and receiver inputs

of the SP3244E/3245E are characterized for

protection to the following limits:

• ±15kV using the Human Body Model

• ±8kV using the Contact Discharge

method speciﬁed in IEC 1000-4-2

In applications where the transceiver needs to

remain active anytime it is connected to live

RS-232 signals, even if those signals remain

idle for longer than tOFFLINE, then the STATUS

output may be used to drive the ONLINE pin.

The STATUS output pin functions the same in

both Auto On-line^®and Auto On-line^®Plus de-

vices. STATUS will output logic 1 if any of the

receiver inputs are driven greater than ±2.7V

magnitude by incoming RS-232 signals and

drives logic 0 if receiver inputs are ﬂoating or

driven to ground. Driving the ONLINE pin with

the STATUS output disables Auto On-line^®Plus

(Forced On-Line) whenever RS-232 voltages

are seen on any receiver inputs. If no RS-232

voltages are seen on the receiver inputs the

Auto On-line^®Plus transceiver will still activate

its charge pump and driver outputs when the

driver inputs are active. This allows the trans-

ceiver to signal a remote Auto On-Line^®or Auto

On-Line^®Plus, on the other end of the data

cable, to wake up.

• ±15kV using the Air-Gap Discharge method

speciﬁed in IEC 1000-4-2

The STATUS output pin remains active in all

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

13

DESCRIPTION

Auto On-Line® Plus Truth Table

Idle inputs

(RxIN & TxIN)

Operating mode

ONLINE

SHUTDOWN |RxIN| > ± 2.7 V

TxOUT

RxOUT

R2OUT

Forced Shutdown

Forced Online

X

1

0

1

X

high-Z

active

high-Z

active

®

Auto On-line Plus

0

1

X

active

high-Z

active

high-Z

active

high-Z

active

(Wake When Active)

®

Auto On-line Plus

0

1

idle > 30s

(Off-Line When Idle)

®

Auto On-line Plus

STATUS

1

yes

no

yes

no

X

active

idle > 30s

X

(Wake On Cable)

®

Auto On-line Plus

1

(Wake When Active)

®

Auto On-line Plus

1

(Off-Line When Idle)

®

Auto On-line

(Wake On Cable)

STATUS

®

Auto On-line

(Auto Shutoff)

X

ESD Test Conditions

ESD performance depends on a variety of

conditions. Contact Sipex for a reliability report

that documents test setup, methodology and

results.

Series resistance is lower in the IEC 1000-4-2

model. Hence, the ESD withstand voltage mea-

sured to IEC 1000-4-2 is generally lower than

that measured using the Human Body Model.

The air-gap test involves approaching the

device with a charged probe. The contact

discharge method connects the probe to the

device before the probe is energized.

IEC 1000-4-2

The IEC 1000-4-2 standard covers ESD

testing and performance of ﬁnished equip-

ment. However, it does not speciﬁcally refer to

integrated circuits. The SP3244E/3245E helps

you design equipment to meet IEC 1000-4-2,

without sacriﬁcing boardspace and cost for

external ESD-protection components. The

major difference between tests done using the

Human Body Model and IEC 1000-4-2 is a

higher peak current in IEC 1000-4-2.

Machine Model

The machine model for ESD tests all pins using

a 200pF storage capacitor and zero discharge

resistance. The objective is to emulate the

stress caused when I/O pins are contacted by

handling equipment during test and assembly.

ESD Table

IEC1000-4-2

Device Pin Tested

Human Body Model

Air discharge

± 15kV

Contact discharge

± 8kV

Level

TxOUT

RxIN

± 15kV

4

± 15kV

± 8kV

TxIN, RxOUT, ONLINE,

SHUTDOWN, STATUS

± 2kV

1

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

14

DESCRIPTION

Valid RS232 Level: STATUS = 1

Indeterminate

2.7V

SHUTDOWN

Edge

Detect

T_IN

R_IN

S

30 second

timer

R

0.3V

IDLE

Invalid Level: STATUS = 0

Indeterminate

Edge

Detect

-0.3V

ONLINE

-2.7V

Auto On-line^®Plus Logic

Valid RS232 Level: STATUS = 1

Receiver Positive and Negative Threshold versus

STATUS Output Signal

SHUTDOWN

Low-Power Shutdown

ONLINE

IDLE

STATUS Output Logic

SHUTDOWN

Low-Power Shutdown

ONLINE

IDLE

Shutdown Logic

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

15

®

AUTO ON-LINE PLUS

RECEIVER

INPUTS

INVALID

REGION

}

TRANSMITTER

INPUTS

TRANSMITTER

OUTPUTS

Vcc

0

STATUS

OUTPUT

t

TSTL

t

STH

t

OFFLINE

t

ONLINE

t

ONLINE

Vcc

0

OUTPUT

V+

Vcc

0

V-

Auto On-Line^®Plus Timing Diagram

tSTL (=30µs typ.)

tSTH (=0.4µs typ.)

tOFFLINE (=30s typ.)

tONLINE (=100µs typ.)

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

16

TYPICAL OPERATING CIRCUIT

VCC

+

26

C5

C1

0.1µF

28

VCC

27

C1+

V+

+

0.1µF

C3

C4

24

1

C1-

C2+

3

SP3244E/45E

V-

+

C2

0.1µF

2

+

C2-

T1OUT

T2OUT

9

T1IN

14

T2IN

T3IN

RS-232

10

13

12

20

19

TTL/CMOS

INPUTS

OUTPUTS

T3OUT

11

R2OUT

R1OUT

R1IN

4

5

6

7

8

5KΩ

R2OUT

R2IN

18

17

16

15

TTL/CMOS

OUTPUTS

5KΩ

R3IN

R3OUT

R4OUT

R5OUT

RS-232

INPUTS

5KΩ

R4IN

5KΩ

R5IN

VCC

22

23

SHUTDOWN

ONLINE

Online Control

21

To µP Supervisor

Circuit

STATUS

GND

25

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

17

PACKAGE PINOUT

C2+

C2-

V-

C1+

V+

28

27

26

1

2

3

VCC

GND

R1IN

25

24

23

4

5

6

R2IN

R3IN

C1-

SP3244E

SP3245E

ONLINE

SHUTDOWN

22

R4IN 7

STATUS

R2OUT

R1OUT

R2OUT

R3OUT

R4OUT

21

20

19

18

R5IN

8

9

T1OUT

T2OUT 10

T3OUT 11

17

16

15

T3IN

12

T2IN 13

T1IN

R5OUT

14

R1

R2

R3

1

2

3

24

23

22

GND

IN

C1-

ONLINE

SP3244/SP3245

QFN-32

R4

R5

4

5

21 SHUTDOWN

IN

20

19

18

17

STATUS

TOP VIEW

T1

T2

T3

6

7

8

R2

OUT

R1

OUT

R2

OUT

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

18

28 PIN TSSOP

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

19

28 PIN SSOP

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

20

32 PIN QFN

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

21

ORDERING INFORMATION

Part number

Temperature range

From 0º to +70ºC

From -40º to +85ºC

From 0º to +70ºC

From -40º to +85ºC

Package Type

28 pin SSOP

28 pin TSSOP

28 pin SSOP

28 pin TSSOP

32 pin QFN

SP3244ECA-L

SP3244ECY-L

SP3244EEA-L

SP3244EEY-L

SP3244EER1-L

SP3245ECA-L

SP3245ECY-L

SP3245EEA-L

SP3245EEY-L

SP3245EER1-L

28 pin SSOP

28 pin TSSOP

28 pin SSOP

28 pin TSSOP

32 pin QFN

Available in lead free packaging.

Available in Tape and Reel. To order add "/TR" sufﬁx to part number,

Example: SP3244ECA-L= Standard: SP3244ECA-L/TR =Tape and Reel

Sipex Corporation

Headquarters and

Sales Ofﬁce

233 South Hillview Drive

Solved by Sipex

TM

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 applica-

tion or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.

Rev M 10/9/06

SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line^®Plus

22


型号：	SP3244E
厂家：	SIPEX CORPORATION
描述：	3.0V to 5.5V RS-232 Transceivers with Auto On-Line㈢ Plus 3.0V至5.5V的RS - 232收发器，带有自动导通线®加
文件：	总22页 (文件大小：923K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SP3244E [SIPEX]

相关型号：

SP3244ECA-L

SP3244ECA-L/TR

SP3244ECY-L

SP3244ECY-L/TR

SP3244EEA-L

SP3244EEA-L/TR

SP3244EER1-L

SP3244EER1-L/TR

SP3244EER1-L/TR

SP3244EEY-L

SP3244EEY-L/TR

SP3245E