SP3245ECY-L [SIPEX]
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®加型号: | SP3245ECY-L |
厂家: | SIPEX CORPORATION |
描述: | 3.0V to 5.5V RS-232 Transceivers with Auto On-Line㈢ Plus |
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-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
© Copyright 2006 Sipex Corporation
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.
TTL/CMOS receiver output.
TTL/CMOS receiver output.
TTL/CMOS receiver output.
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
© Copyright 2006 Sipex Corporation
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
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
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
© Copyright 2006 Sipex Corporation
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
V
VCC = 3.3V
0.6
0.8
1.0
1.2
1.2
1.7
200
4.5
VCC = 5.0V
VCC = 3.3V
VCC = 5.0V
Input Threshold High
2.4
2.4
V
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
kV
Human Body Model
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
V
Rx Input Threshold to
STATUS Output Low
±0.3
Threshold to STATUS High
Threshold to STATUS Low
tSTH
tSTL
0.4
30
µs
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
© Copyright 2006 Sipex Corporation
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
µs
µs
ns
2.0
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
µs
µs
ns
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Receiver Skew
tRPHL,tRPLH
tRZH , tRZL
tRZH , tRLZ
2.0
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
© Copyright 2006 Sipex Corporation
5
TYPICAL PERFORMANCE CHARACTERISTICS
400
350
300
250
200
150
100
3
2.5
2
1.5
1
0.5
0
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
0
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)
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
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
© Copyright 2006 Sipex Corporation
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
© Copyright 2006 Sipex Corporation
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
© Copyright 2006 Sipex Corporation
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
© Copyright 2006 Sipex Corporation
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
© Copyright 2006 Sipex Corporation
10
DESCRIPTION
+
V
CC
-
Phase 2 – Vss transfer from C2 to C4.
Meanwhile C1 is charged to Vcc
+
C
+
+
+
V+
3
C
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
C
1
2
-
e
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
C
1
2
-
e
V-
+
C
4
Charge Pump Phases
Minimum Recommended Charge Pump Capacitor Values
Input Voltage VCC
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
© Copyright 2006 Sipex Corporation
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
© Copyright 2006 Sipex Corporation
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
© Copyright 2006 Sipex Corporation
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
X
X
X
high-Z
active
high-Z
active
active
active
®
Auto On-line Plus
0
1
X
X
active
active
high-Z
active
active
high-Z
active
high-Z
active
active
active
active
active
active
active
active
active
active
active
active
active
active
(Wake When Active)
®
Auto On-line Plus
0
1
idle > 30s
(Off-Line When Idle)
®
Auto On-line Plus
STATUS
STATUS
STATUS
STATUS
STATUS
1
yes
no
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
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
± 15kV
4
4
± 15kV
± 8kV
TxIN, RxOUT, ONLINE,
SHUTDOWN, STATUS
± 2kV
± 2kV
± 2kV
1
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line® Plus
© Copyright 2006 Sipex Corporation
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
© Copyright 2006 Sipex Corporation
15
®
AUTO ON-LINE PLUS
RECEIVER
INPUTS
INVALID
REGION
}
TRANSMITTER
INPUTS
TRANSMITTER
OUTPUTS
Vcc
0
STATUS
OUTPUT
t
TSTL
t
STH
t
t
OFFLINE
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
© Copyright 2006 Sipex Corporation
16
TYPICAL OPERATING CIRCUIT
VCC
+
+
26
C5
C1
0.1µF
28
VCC
27
C1+
V+
+
0.1µF
0.1µF
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
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
© Copyright 2006 Sipex Corporation
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
IN
IN
C1-
ONLINE
SP3244/SP3245
QFN-32
R4
R5
4
5
21 SHUTDOWN
IN
IN
20
19
18
17
STATUS
TOP VIEW
T1
T2
T3
6
7
8
R2
OUT
OUT
OUT
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
© Copyright 2006 Sipex Corporation
18
28 PIN TSSOP
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line® Plus
© Copyright 2006 Sipex Corporation
19
28 PIN SSOP
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line® Plus
© Copyright 2006 Sipex Corporation
20
32 PIN QFN
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line® Plus
© Copyright 2006 Sipex Corporation
21
ORDERING INFORMATION
Part number
Temperature range
From 0º to +70ºC
From 0º to +70ºC
From -40º to +85ºC
From -40º to +85ºC
From -40º to +85ºC
From 0º to +70ºC
From 0º to +70ºC
From -40º to +85ºC
From -40º to +85ºC
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
© Copyright 2006 Sipex Corporation
22
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