Rev M 10/9/06 SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line

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.

DESCRIPTION

FEATURES

APPLICATIONS

· Portable RS-232
· Laptops and handheld PCs and PDA
· Cellular telephones, datacables, chargingcradles
· Diagnostic/upload ports on embedded applications
· Use in conjunction with low-voltage UART or
microcontroller
· SP3244E is cross-compatible with MAX3244E,
ICL3244E
· SP3245E is cross-compatible with MAX3245E,
ICL3245E

SP3244E-SP3245E

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

· 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
· 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 V

variations

· ESD Specifications:

15KV Human Body Model

15KV IEC1000-4-2 Air Discharge

8KV IEC1000-4-2 Contact Discharge

SP3244E

SP3245E

1
2
3
4
5
6
7
8
9

27
26
25
24
23
22
21
20
19
18
17
16
15

C2+

C2-

V-

OUT

C1+
V+
V

GND

C1-

ONLINE

SHUTDOWN

STATUS

OUT

Rev M 10/9/06 SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line

PIN ASSIGNMENTS

NAME

FUNCTION

PIN NUMBER

(T)SSOP

QFN

C2+

Positive terminal of the inverting charge pump capacitor.

C2-

Negative terminal of the inverting charge pump capacitor.

V-

Regulated -5.5V output generated by the charge pump.

R1IN

RS-232 receiver input.

R2IN

RS-232 receiver input.

R3IN

RS-232 receiver input.

R4IN

RS-232 receiver input.

R5IN

RS-232 receiver input.

T1OUT

RS-232 driver output.

T2OUT

RS-232 driver output.

T3OUT

RS-232 driver output.

T3IN

TTL/CMOS driver input.

T2IN

TTL/CMOS driver input.

T1IN

TTL/CMOS driver input.

R5OUT

TTL/CMOS receiver output.

R4OUT

TTL/CMOS receiver output.

R3OUT

TTL/CMOS receiver output.

R2OUT

TTL/CMOS receiver output.

R1OUT

TTL/CMOS receiver output.

R2OUT

Non-inverting receiver 2 output; active in shutdown.

STATUS

Status output.

SHUTDOWN

Forced SHUTDOWN input. Drive low to shut down drivers, receivers
and charge pump. Will override Auto On-line

Plus. Do not leave this

pin open.

ONLINE

Auto On-line

input. Active low enabled automatic power saving

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

C1-

Negative terminal of the voltage doubler charge pump capacitor.

GND

Ground connection.

VCC

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

V+

Regulated +5.5V output generated by the charge pump.

C1+

Positive terminal of the voltage doubler charge pump capacitor.

Rev M 10/9/06 SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (Vcc).......................-0.3V to + 6.0V
V+ (Note 1)......................................-0.3V to + 7.0V
V- (Note 1).......................................+0.3V to - 7.0V
|V+| + |V-| .......................................................+13V
Input voltage at TTL input pin.. -0.3V toV

+0.3V

RxIN..............................................................+/-18V
Driver output (from Ground)...................... +/-13.2V
RxOUT, STATUS.....................-0.3V to V

+ 0.3V

Short Circuit Duration, TxOUT to GND, Continuous
(One output at a time maximum)
Storage Temperature.....................-65°C to +150°C
Operating Temperature SP324XECX................0°C to +70°C
Operating Temperature SP324XEEX...........-40°C to +85°C
Lead Temperature (soldering, 10s)..............+300°C

SSOP-28,

= 67.1ºC/W

TSSOP-28,

= 83.6ºC/W

QFN- 32,

JA=

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

PIN ASSIGNMENTS

Unless otherwise noted V

= +3.0V to +5.5V, T

AMB

= T

MIN

to T

MAX

, C1C4 = 0.1µF.

Typical values are at T

AMB

= +25°C, V

= 3.3V.

PARAMETERS

SYMB

TEST CONDITIONS

MIN.

TYP.

MAX.

UNIT

DC CHARACTERISTICS

Supply Current,
Auto On-Line

Plus

Receivers idle, TxIN = Vcc or GND,
ONLINE = GND, SHUTDOWN = Vcc
Note 1

µA

Supply Current, Shutdown

SHUTDOWN = GND

µA

Supply Current, Active

ONLINE = SHUTDOWN = Vcc, No
Load

Driver Input and Logic Input Pins:

Logic
Input
Voltage

High

Vcc = 3.3V

Vcc = 5.0V

2.4

Low

0.8

Logic Threshold

1.5

Logic Input Leakage Current

0.01

±1.0

µA

Logic Input Hysteresis

HYS

100

Receiver Outputs and STATUS Output

Receiver Output Voltage Low

OUT

= -1.6mA

0.4

Receiver Output Voltage High

OUT

= 1mA

-0.6

Receiver Output Leakage Current

Receivers disabled.
0.4V < V

< 5.5V

±0.02

±1

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

ELECTRICAL CHARACTERISTICS

PARAMETERS

SYMB

TEST CONDITIONS

MIN.

TYP.

MAX.

UNIT

Receiver Inputs

Input Voltage Range

-15

+15

Input Threshold Low

= 3.3V

0.6

1.0

= 5.0V

0.8

1.2

Input Threshold High

= 3.3V

1.2

2.4

= 5.0V

1.7

2.4

Input Hysteresis

200

Input Resistance

= 25ºC

4.5

Driver Outputs

Output Voltage Swing

All transmitter outputs loaded with
3k to GND

±5.0

±5.6

Output load = Open Circuit

±15.0

Short Circuit Current

Vout = 0V

±60

Power-Off Impedance

= V+ = V- = 0, transmitter

outputs = ±2V

300

10M

Output Leakage Current

= 0 or 3V to 3.3V, V

OUT

= ±12V,

Drivers disabled

±25

µA

Mouse Drivability

T1IN = T2IN = GND, T3IN = V

T3 loaded with 3k to GND, T1OUT
and T2OUT loaded with 2.5mA each

±5.0

ESD Protection

IEC 1000-4-2 Air Discharge

±15

ESD Protection for RxIn, TxOut
pins

IEC 1000-4-2 Contact Discharge

±8

Human Body Model

±15

All Other Pins

Human Body Model

±2

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

Rx Input Threshold to
STATUS Output High

±2.7

Rx Input Threshold to
STATUS Output Low

±0.3

Threshold to STATUS High

STH

0.4

µs

Threshold to STATUS Low

STL

µs

Rx or Tx Transition to
Drivers Enabled

ONLINE

100

µs

Last Rx or Tx Transition to Driv-
ers Disabled

OFFLINE

Note 1

sec

Note 1: Characterized, not 100% tested.

Unless otherwise noted V

= +3.0V to +5.5V, T

AMB

= T

MIN

to T

MAX

, C1C4 = 0.1µF.

Typical values are at T

AMB

= +25°C, V

= 3.3V.

Rev M 10/9/06 SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line

TIMING CHARACTERISTICS

Unless otherwise noted V

= +3.0V to +5.5V, T

AMB

= T

MIN

to T

MAX

, C1C4 = 0.1µF. Typical values are

at T

AMB

= +25°C, V

= 3.3V.

PARAMETERS

SYMBOL

TEST CONDITIONS

MIN.

TYP.

MAX.

UNIT

SP3244E

Maximum Data Rate

= 3k, C

= 1000pF. One

transmitter switching.

250

kbps

Driver Propagation Delay

DPHL

, t

DPLH

=1000pF

1600

Transition-Region Slew Rate

=3k to 7k, C

=150pF to

1000pF, measurements taken
from +3V to -3V or from -3V to
+3V.

V/µs

Driver Skew

DPHL

- t

DPLH

| at zero crossing

Receiver Propagation Delay

RPHL

RPLH

to R

OUT

, C

= 150pF

0.15

µs

Receiver Output Enable Time

RZH

, t

RZL

0.04

2.0

µs

Receiver Output Disable Time

RZH

, t

RLZ

0.1

2.0

µs

Receiver Skew

PHL

- t

PLH

| at 1.5V

SP3245E

Maximum Data Rate

= 3k, C

= 250pF. One

transmitter switching.

1000

kbps

= 3k, C

= 1000pF. One

transmitter switching.

500

kbps

Driver Propagation Delay

DPHL

, t

DPLH

=250pF

700

Transition-Region Slew Rate

=3k to 7k, C

=150pF to

250pF, measurements taken from
+3V to -3V or from -3V to +3V.

150

V/µs

Driver Skew

DHPL

- t

DPLH

| at zero crossing

100

Receiver Propagation Delay

RPHL

RPLH

to R

OUT

, C

= 150pF

0.15

µs

Receiver Output Enable Time

RZH

, t

RZL

0.05

2.0

µs

Receiver Output Disable Time

RZH

, t

RLZ

0.1

2.0

µs

Receiver Skew

PHL

- t

PLH

| at 1.5V

Rev M 10/9/06 SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line

100

150

200

250

300

350

400

250

500

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

Load Capacitance (pF)

Skew (ns)

3244, 250kbps

3245, 1Mbps

TYPICAL PERFORMANCE CHARACTERISTICS

Turn on Time vs. Temperature

vs. Load Capacitance

Transmitter Output vs. Load Capacitance

Transmitter Input to Receiver Output Propaga-

tion Delay vs. Load Capacitance

Transmitter Output Slew Rate vs. Load Capaci-

tance

Transmitter Skew vs. Load Capacitance

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

Load Capacitiance (pF)

Supply Current (mA)

250kbps

1Mbps

0.5

1.5

2.5

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

Load Capacitiance (pF)

Tin to Rout Propagation Delay (us)

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

Load Capacitiance (pF)

Transmitter Output Slew Rate (V/us)

-6

-5

-4

-3

-2

-1

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

Load Capacitiance (pF)

Transmitter Output Voltage (V)

V-

V+

100

150

200

250

300

350

400

-55

-30

-5

Temperature (ºC)

Charge Pump Turn-on Time (us)

Supply Current (mA)

ransmitter Output V

oltage (V)

to R

OUT

Propagation Delay (µs)

Charge Pump

urn-on

ime (µs)

ransmitter Output Slew Rate (V/µs)

Skew (ns)

Rev M 10/9/06 SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line

DESCRIPTION

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.

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.

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.

Drivers
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.

The SP3244E/3245E devices operate at this
typical data rate when fully loaded. The drivers
can guarantee output data rates fully loaded
with 3K 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

(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.

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.

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 5K pull-
down resistor to ground will commit the output
of the receiver to a HIGH state.

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.

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 fourphase
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.

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 V

Rev M 10/9/06 SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line

DESCRIPTION

Phases 1 and 3: Store/Double.
Double charge from C1 onto C2.
C2 is now charged to -2xVcc

Phase 2 Vss transfer from C2 to C4.
Meanwhile C1 is charged to Vcc

Vss

transfer from C2 to C3.

Meanwhile C1 is charged to Vcc

V-

V+

V-

V+

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

Phase 4 V

Charge Pump Phases

Minimum Recommended Charge Pump Capacitor Values

Input Voltage V

Charge Pump Capacitor Value for SP32XX

3.0V to 3.6V

C1-C4=0.1µF

4.5V to 5.5V

C1=0.047µF, C2-C4=0.33µF

3.0V to 5.5V

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

DESCRIPTION

surface mount ceramic capacitors (such as are
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.

Capacitance values may be increased if operat-
ing at higher V

or to provide greater stability as

the capacitors age. See Charge Pump Capacitor
Value table on page 11.

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.

RS-232 signals use both positive and negative
voltages of greater than ±5V magnitude. Receiv-
ers have nominal 5k 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.

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.

Phase 3
V

charge store and double: Phase three is

identical to the first phase. The positive ter-
minals of capacitors C1 and C2 are charged
from V

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 V

the voltage potential across

capacitor C2 is now 2 x V

Phase 4
V

transfer: The fourth phase connects the

negative terminal of C2 to ground and the posi-
tive terminal of C2 to the V

storage capacitor.

This transfers the doubled (V+) voltage onto C3.
Meanwhile, capacitor C1 charged from V

prepare it for its next phase.

The Sipex chargepump generates V+ and
V independently from V

. Hence in a noload

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.

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.

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

Fig ure 0 Receiver 5k Current Pat h to Ground

Receiver

Reciever 5k 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.

Rev M 10/9/06 SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line

DESCRIPTION

±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.

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
· ±15kV using the Air-Gap Discharge method
specified in IEC 1000-4-2

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
(t

ONLINE

100µs typical).

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 t

OFFLINE

) 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 t

OFFLINE

interval

is at least 15 seconds and no longer than 60
seconds.

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 t

OFFLINE

, 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.

The STATUS output pin remains active in all

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.

Rev M 10/9/06 SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line

ESD Test Conditions
ESD performance depends on a variety of
conditions. Contact Sipex for a reliability report
that documents test setup, methodology and
results.

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.

DESCRIPTION

Auto On-Line® Plus Truth Table

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.

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.

Device Pin Tested

Human Body Model

IEC1000-4-2

Air discharge

Contact discharge

Level

TxOUT

± 15kV

± 8kV

RxIN

± 15kV

± 8kV

TxIN, RxOUT, ONLINE,

SHUTDOWN, STATUS

± 2kV

Operating mode

ONLINE

SHUTDOWN

|RxIN| > ± 2.7 V

Idle inputs

(RxIN & TxIN)

TxOUT

RxOUT

R2OUT

Forced Shutdown

high-Z

active

Forced Online

active

Auto On-line

Plus

(Wake When Active)

active

Auto On-line

Plus

(Off-Line When Idle)

idle > 30s

high-Z

active

Auto On-line

Plus

(Wake On Cable)

STATUS

yes

active

Auto On-line

Plus

(Wake When Active)

STATUS

active

Auto On-line

Plus

(Off-Line When Idle)

STATUS

idle > 30s

high-Z

active

Auto On-line

(Wake On Cable)

STATUS

yes

active

Auto On-line

(Auto Shutoff)

STATUS

high-Z

active

ESD Table

Rev M 10/9/06 SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line

PACKAGE PINOUT

SP3244E

SP3245E

1
2
3
4
5
6
7
8
9

27
26
25
24
23
22
21
20
19
18
17
16
15

C2+

C2-

V-

OUT

C1+
V+
V

GND

C1-

ONLINE

SHUTDOWN

STATUS

OUT

1
1

OUT

GND

OUT

C1-

ONLINE

SHUTDOWN

STATUS

OUT

V+

C1+

C2+

C2-

SP3244/SP3245

QFN-32

TOP VIEW

Rev M 10/9/06 SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line

Solved by Sipex

Sipex Corporation

Headquarters and
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 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.

Part number

Temperature range

Package Type

SP3244ECA-L

From 0º to +70ºC

28 pin SSOP

SP3244ECY-L

From 0º to +70ºC

28 pin TSSOP

SP3244EEA-L

From -40º to +85ºC

28 pin SSOP

SP3244EEY-L

From -40º to +85ºC

28 pin TSSOP

SP3244EER1-L

From -40º to +85ºC

32 pin QFN

SP3245ECA-L

From 0º to +70ºC

28 pin SSOP

SP3245ECY-L

From 0º to +70ºC

28 pin TSSOP

SP3245EEA-L

From -40º to +85ºC

28 pin SSOP

SP3245EEY-L

From -40º to +85ºC

28 pin TSSOP

SP3245EER1-L

From -40º to +85ºC

32 pin QFN

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

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

Available in lead free packaging.

ORDERING INFORMATION

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: SP3244E

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: SP3244E