View SP3227EEY-L_1314797.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

Solved by
SP3224E-SP3227E
TM
3.0V to 5.5V RS-232 Transceivers with Auto On-Line(R) Plus
FEATURES 15kV ESD protected RS-232 I/O pins Auto On-line(R) Plus automatic power saving mode Meets true EIA/TIA-232-F standards from +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 Drop-in replacement to MAX3224, ICL3224, MAX3225, ICL3225, MAX3226, ICL3226, MAX3227 and ICL3227 SP3224E and SP3225E reduced EMI with a slew rate controlled 250kbps data rate SP3226E and SP3227E- high speed data rate of 1 Mbps. Available in RoHS compliant, Lead Free Packaging
READY 1 C1+ 2 V+ 3 20 SHUTDOWN 19 VCC 18 GND
Solved by
4 C2+ 5 C2- 6 SP3224E SP3225E V- 7
C1-
17 T1OUT 16 R1IN 15 R1OUT 14 ONLINE 13 T1IN 12 T2IN 11 STATUS
TM
8 9 R2OUT 10
T2OUT R2IN
All devices feature 3.0V to 5.5V power supply, 4 small charge pump capacitors, and 15kV ESD protection.
Device SP3224E SP3225E SP3226E SP3227E Data Rate (bps) 250k 1M 250k 1M No. of Drivers/Receivers 2/2 2/2 1/1 1/1 READY pin Yes Yes Yes Yes Low-Power Shutdown Auto On-Line(R) Plus Auto On-Line(R) Plus Auto On-Line(R) Plus Auto On-Line(R) Plus
(R)
TYPICAL APPLICATIONS Diagnostic/Serial ports on embedded applications Handheld Test Equipment PC related Peripherals and Equipment Battery Powered Equipment Point-of-sale Equipment Set-top Box DESCRIPTION The SP3224E/3225E are 2-driver/2-receiver devices and the SP3226E/SP3227E are 1driver/1-receiver devices. All are ideal for computer peripherals, point-of-sale equipment, consumer and embedded applications. These devices use an internal high-efficiency, charge-pump power supply that requires only 0.1F capacitors in 3.3V operation. This charge pump and Sipex's driver architecture allow it to deliver compliant RS-232 performance from a single 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 over short cables. The Auto On-line(R) Plus feature allows the device to automatically "wake-up" during a shutdown state upon detecting activity and to enter a low power shutdown if idle. This power saving feature functions without system intervention or modifications to software or drivers. SELECTION TABLE
Package 20 SSOP/TSSOP 20 SSOP/TSSOP 16 SSOP/TSSOP 16 SSOP/TSSOP
Rev P 11/20/06
SP3224E-SP3227E Transceivers with Auto On-line
1
Plus
(c) 2006 Sipex Corporation
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 pins ............................-0.3V to Vcc+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...............................................-65C to +150C Operating Temperature SP322XECX...........................0C to +70C Operating Temperature SP322XEEX........................-40C to +85C Lead Temperature (soldering, 10s)....................................... +300C Note 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V. Maximum junction temperature.....................................................150C Thermal Derating, Junction to Ambient SSOP20..............................................................................JA =83C/W TSSOP20.......................................................................JA =110.7C/W SSOP16..............................................................................JA =87C/W TSSOP16.......................................................................JA =100.4C/W
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.
ELECTRICAL SPECIFICATIONS
Unless otherwise noted VCC = +3.0V to +5.5V, TAMB = TMIN to TMAX,. Typical values are at TAMB = +25C. C1-C4 = 0.1F tested at 3.3V 10%. C1=0.047F C2-C4 = 0.33F tested at 5V 10%.
Parameters DC Characteristics Supply Current, Auto On-Line(R) Plus Supply Current, Shutdown Supply Current, Active Supply Current, Active Driver Input and Logic Input Pins High Logic Input Voltage Low Logic Threshold Logic Input Leakage Current Logic Input Hysteresis Receiver Outputs and STATUS Output Receiver Output Voltage Low Receiver Output Voltage High Note 2: Characterized, not 100% tested. VOL VOH IOUT = -1.6mA IOUT = 1mA Vcc - 0.6 0.4 V V VIH VIH VIL VT IIL VHYS 1.5 0.05 100 1.0 A mV Vcc = 3.3V Vcc = 5.0V 2 2.4 0.8 V ICC3 ICC2 ICC1 ICC1 Receivers idle, TxIN = Vcc or GND, ONLINE = GND, SHUTDOWN = Vcc Note 2 SHUTDOWN = GND ONLINE = SHUTDOWN = Vcc, No Load ONLINE = SHUTDOWN = VCC=3.3V, No Load 1 1 1.5 0.7 10 10 2.0 1.0 A A mA mA Symb Test Conditions Min. Typ. Max. Unit
Rev P 11/20/06
SP3224E-SP3227E Transceivers with Auto On-line
(R)
2
Plus
(c) 2006 Sipex Corporation
Unless otherwise noted VCC = +3.0V to +5.5V, TAMB = TMIN to TMAX,. Typical values are at TAMB = +25C. C1-C4 = 0.1F tested at 3.3V 10%. C1=0.047F C2-C4 = 0.33F tested at 5V 10%.
Parameters Driver Outputs Output Voltage Swing VO Output load = 3k to GND Output load = Open Circuit Short Circuit Current Power-Off Impedance Output Leakage Current Receiver Inputs Input Voltage Range Input Threshold Low Vcc = 3.3V Vcc = 5.0V Input Threshold High Vcc = 3.3V Vcc = 5.0V Input Hysteresis Input Resistance ESD Protection ESD Protection for R_In, T_Out pins All Other Pins Auto On-line Plus (ONLINE = GND, SHUTDOWN = Vcc) Rx Input Threshold to STATUS output high Rx Input Threshold to STATUS output low Threshold to STATUS high Threshold to STATUS low Rx or Tx transition to drivers enabled Last Rx or Tx transition to drivers disabled tSTH tSTL tONLINE tOFFLINE Note 3 Note 2, 3 15 0.3 0.5 30 100 30 60 2.7
(R)
ELECTRICAL SPECIFICATIONS
Symb
Test Conditions
Min.
Typ.
Max.
5.0
6.0 15.0 60
V
VOUT = 0V Vcc=V+ = V- = 0 transmitter outputs= 2V Vcc = 0 or 3V to 3.3V, VOUT = 12V, Drivers disabled 300 10M
mA
25
A
-15 0.6 0.8 1.2 1.5 1.5 1.8 500 3 5
15
V V
2.4 2.4
V
mV 7 k
Human Body Model Human Body Model
15 2
kV kV
V V s s s sec
Note 3: A transmitter/receiver edge is defined as a transition through input logic thresholds.
Rev P 11/20/06
SP3224E-SP3227E Transceivers with Auto On-line
(R)
3
Plus
(c) 2006 Sipex Corporation
TIMING CHARACTERISTICS
Unless otherwise noted VCC = +3.0V to +5.5V, TAMB = TMIN to TMAX,. Typical values are at TAMB = +25C. C1-C4 = 0.1F tested at 3.3V 10%. C1=0.047F C2-C4 = 0.33F tested at 5V 10%
Parameters SP3224E and SP3226E Maximum Data Rate RL = 3k, CL = 1000pF. One transmitter switching. Measurement taken from +3.0V to -3.0V or -3.0V to +3.0V, TAMB = 25C RL = 3k to 7k, CL = 150pF to 1000pF tRPHL , tRPLH R_IN to R_OUT, CL = 150pF 250 kbps Symbol Test Conditions Min. Typ. Max. Unit
Transition -Region Slew Rate
4
30
V/s
Receiver Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Receiver Skew
0.22
s
tRZH , tRZL
RL = 3k, CL = 150pF
0.2
2
s
tRHZ , tRLZ |tPHL - tPLH| at 1.5V
0.2 200
2
s ns
Parameters SP3225E and SP3227E
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Maximum Data Rate
RL = 3k, CL = 250pF. One transmitter Switching RL = 3k, CL = 1000pF. One transmitter Switching Measurement taken from +3.0V to -3.0V or -3.0V to +3.0V, TAMB=25C RL = 3k to 7k, CL = 150pF to 250pF
1000 500
kbps kbps
Instantaneous Slew Rate
24
150
V/s
Driver Skew Receiver Propagation Delay Receiver Output Enable Time Receiver Output Disable Time Receiver Skew
|tDPHL - tDPLH| tRPHL , tRPLH tRZH , tRZL tRHZ , tRLZ |tPHL - tPLH|
at zero crossing R_IN to R_OUT, CL = 150pF
75 0.20 0.3 0.2 2 2
ns s s s ns
at 1.5V
80
Rev P 11/20/06
SP3224E-SP3227E Transceivers with Auto On-line
(R)
4
Plus
(c) 2006 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS:CURVES
2.5
1.6
TxIn to RxOut Propagation Delay (us)
TxIn to RxOut Propagation Delay (us)
1.4 1.2 1 0.8 0.6 0.4
2
1.5
1
0.5
TxIn to RxOut Propagation Delay (us) 0 0 1000 2000 3000 4000 5000 Load Capacitance (pF)
TxIn to RxOut Propagation Delay (us) 0.2 0 0 1000 2000 3000 4000 5000 Load Capacitance (pF)
SP3224E/SP3226E Transmitter Input to Receiver Output Propagation Delay vs. Load Capacitance
30
SP3225E/SP3227E Transmitter Input to Receiver Output Propagation Delay vs. Load Capacitance
45
Transmitter Output Slew Rate (V/us)
Transmitter Output Slew Rate (V/us)
40 35 30 25 20 15 10 5 Transmitter Output Slew Rate (V/us) 0 0 1000 2000 3000 4000 5000 Load Capacitance (pF)
SRavg SRneg SRpos
25
20 SRneg 15 SRavg 10 SRpos
5 Transmitter Output Slew Rate (V/us) 0 0 1000 2000 3000 4000 5000 Load Capacitance (pF)
SP3224E/SP3226E Transmitter Output Slew Rate vs. Load Capacitance
SP3225E/SP3227E Transmitter Output Slew Rate vs. Load Capacitance
6 V+
6 V+
Transmitter Output Voltage (V)
Transmitter Output Voltage (V)
2000 3000 4000 5000
4
4
2
2
0
0
-2
-2
Transmitter Output Voltage (V) -4 V-6 0 1000 Load Capacitance (pF)
Trasmitter Output Voltage (V) -4 V-6 0 1000 2000 3000 4000 5000 Load Capacitance (pF)
SP3224E/SP3226E Transmitter Output Voltage vs. Load Capacitance
Rev P 11/20/06
SP3225E/SP3227E Transmitter Output Voltage
(R)
SP3224E-SP3227E Transceivers with Auto On-line
5
Plus
(c) 2006 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS:CURVES
250
Transmitter Skew (ns)
200 SP3225, 1Mbps 150 SP3224, 250kbps 100 Transmitter Skew (ns) 50
0 0 500 1000 1500 2000 2500 3000 3500 Load Capacitance (pF)
Driver Skew vs. Load Capacitance
30
25
Supply Current (mA)
20
SP3225, 1Mbps SP3227
15
SP3224, 250kbps SP3226
10 Supply Current (mA) 5
0 0 1000 2000 3000 4000 5000 Load Capacitance (pF)
Supply Current vs. Load Capacitance
Charge Pump Turn-on Time versus Temperature
85
Charge Pump Turn-On Time (us)
80
75
70
65
60
Charge Pump Turn-on Time (us) 55
50 -55 -30 -5 20 Temperature (C) 45 70 95
Charge Pump Turn-On Time vs. Temperature
Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line
(R)
6
Plus
(c) 2006 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS: SCOPE SHOTS
SP3224E/SP3226E Waveforms for 250kbps Clock Rate, RL=3k, CL=1000pF
SP3224E/SP3226E Charge Pump Into Shutdown
SP3224E/SP3226E Waveforms for 250kbps Clock Rate, RL=3k, CL=4700pF
SP3224E/SP3226E Charge Pump Power On Time, Vcc=3.3V
SP3224E/SP3226E Charge Pump Out of Shutdown
SP3224E/SP3226E Charge Pump Waveforms for 250kbp Clock Rate
All Charge Pump waveforms use charge pump capacitor values C1-C4 = 0.1F
Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line
(R)
7
Plus
(c) 2006 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS: SCOPE SHOTS
SP3224E/SP3226E C2+ Charge Pump Waveforms, Vcc=3.3V, All Channels switching
SP3225E/SP3227E Waveforms for 1Mbps Clock Rate, RL=3K, CL=250pF
SP3224E/SP3226E C2+ Charge Pump Waveforms, Vcc=5V, All Channels switching
SP3225E/SP3227E Waveforms for 1Mbps Clock Rate, RL=3K, CL=1000pF
SP3225E/SP3227E Waveforms for 1Mbps Clock Rate, RL=3K, CL=50pF
Rev P 11/20/06
SP3225E/SP3227E Charge Pump Out of Shutdown
(R)
All Charge Pump waveforms use charge pump capacitor values C1-C4 = 0.1F
SP3224E-SP3227E Transceivers with Auto On-line
8
Plus
(c) 2006 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS
SP3225E/SP3227E Charge Pump Into Shutdown
SP3225E/SP3227E Charge Pump Waveforms, Vcc=3.3V, All Channel Switching
SP3225E/SP3227E Charge Pump Power On Time, Vcc=3.3V
SP3225E/SP3227E Charge Pump Waveforms, Vcc=5V, All Channel Switching
SP3225E/SP3227E Charge Pump Waveforms for 1Mbps Clock Rate
All Charge Pump waveforms use charge pump capacitor values C1-C4 = 0.1F
Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line
(R)
9
Plus
(c) 2006 Sipex Corporation
CHARACTERIZATION CIRCUITS AND WAVEFORMS
RS-232 Output
50
Input tTHL Output 3V -3V tTLH 3V -3V
3V 0V
Generator (see note B)
RL
3V SHUTDOWN
CL (see note A)
VOH
VOL 6V SR= tTHL or tTLH TEST CIRCUIT VOLTAGE WAVEFORMS NOTES A. CL includes probe and jig capacitance B. The pulse generator has the following characteristics: PRR= 250kbit/s, Zo=50, 50% duty cycle, tr 10ns, tf 10ns
Figure 1. Driver Slew Rate
Generator (see note B)
RS-232 Output
50
Input tDPHL Output
3V 1.5V 1.5V tDPLH 50% 50% VOH VOL 0V
RL
3V SHUTDOWN
CL (see note A)
TEST CIRCUIT
Skew= ItDPHL- tDPLHI
VOLTAGE WAVEFORMS
NOTES A. CL includes probe and jig capacitance B. The pulse generator has the following characteristics: PRR= 250kbit/s, Zo=50, 50% duty cycle, tr 10ns, tf 10ns
Figure 2. Driver Propagation and Skew
3V or 0V ONLINE
RS-232 Output
50 3V SHUTDOWN
Input tRPHL Output
3V 1.5V 1.5V tRPLH 50% 50% VOH VOL 0V
Generator (see note B)
CL (see note A)
TEST CIRCUIT
NOTES A. CL includes probe and jig capacitance B. The pulse generator has the following characteristics: PRR= 250kbit/s, Zo=50, 50% duty cycle, tr 10ns, tf 10ns
Skew= ItRPHL- tRPLHI
VOLTAGE WAVEFORMS
Figure 3. Receiver Propagation Delay and Skew
Input
3V or 0V ONLINE 3V or 0V
3V 1.5V 1.5V 0V
VCC S1
GND RL Output
tPHZ (51 at GND)
tPZH
VOH 50%
SHUTDOWN
CL (see note A)
Output 0.3V tPLZ (51 at VCC)
Generator (See Note B)
50
tPZL (S1 at VCC) 50% VOL
VOLTAGE WAVEFORMS
0.3V Output
TEST CIRCUIT
NOTES: A CL includes probe and jig capacitance B. The pulse generator has the folowing characteristics Zo=50, 50% duty cycle, tr 10ns, tf 10ns C. tPLZ and tPHZ are the same as tdis D. tPZL and tPZH are the same as ten Figure 4. Receiver Enable and Disable Times
Rev P 11/20/06
SP3224E-SP3227E Transceivers with Auto On-line
(R)
10
Plus
(c) 2006 Sipex Corporation
Description The SP3224E and SP3225E are 2-driver/ 2-receiver devices. The SP3226E and SP3227E are 1-driver/1-receiver devices. All are ideal for serial ports in embedded, consumer, portable, or handheld applications. The transceivers meet the EIA/TIA232 and ITU-T V.28/V.24 communication protocols for reliable serial communication. The 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 SP3224E-SP3227E are ideal choices for power sensitive designs. With the Auto On-line(R) Plus enabled, the SP3224ESP3227E reduce supply current to 1A whenever the transceivers are in idle. In shutdown, the internal charge pump and the drivers will shut down. This feature allows design engineers to address power saving concerns without major design changes. Theory Of Operation The SP3224E-SP3227E are made up of four basic circuit blocks: 1. Drivers, 2. Receivers, 3. the Sipex proprietary charge pump, and 4. Auto On-line(R) 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-TIA232-F and all previous RS-232 versions. Unused driver inputs should be connected to GND or VCC. The drivers can guarantee output data
Rev P 11/20/06
THEORY OF OPERATION rates fully loaded with 3K in parallel with 1000pF (SP3224E/SP3226E), or 3K in parallel with 250pF (SP3225E/SP3227E) ensuring compatibility with PC-to-PC communication software. The slew rate of the driver output on the SP3224E/SP3226E is internally limited to a maximum of 30V/s in order to meet the EIA standards (EIA RS-232D 2.1.7, Paragraph 5). The Slew Rate of SP3225E/SP3227E 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. Receivers remain active during device shutdown. Since receiver input is usually from a transmission 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 immune to noisy transmission lines. Should an input be left unconnected, an internal 5K pulldown resistor to ground will commit the output of the receiver to a HIGH state. Charge Pump The charge pump is a Sipex-patented design (US Patent #5,306,954) and uses a unique approach compared to older lessefficient designs. The charge pump still requires four external capacitors, but uses a four phase voltage shifting technique to attain symmetrical 5.5V power supplies. The internal power supply consists of a regulated dual charge pump that provides output voltages 5.5V regardless of the input voltage (Vcc) over the +3.0V to +5.5V range. This is important to maintain compliant RS-232 levels regardless of power supply fluctuations. The charge pump operates in a discontinuous mode using an internal oscillator. If the output voltages are less than a magnitude
(R)
SP3224E-SP3227E Transceivers with Auto On-line
11
Plus
(c) 2006 Sipex Corporation
of 5.5V, the charge pump is enabled. If the output voltages exceed a magnitude of 5.5V, the charge pump is disabled. This oscillator controls the four phases of the voltage shifting. A description of each phase follows. 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 capacitors 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 Vpower supplies. An intelligent control oscillator regulates the operation of the charge pump to maintain the proper voltages at maximum 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 VCC. Phase 2 VSS transfer and invert: Phase two connects the negative terminal of C2 to the VSS storage 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 VDD charge store and double: Phase three
Rev P 11/20/06
THEORY OF OPERATION is identical to the first phase. 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. Phase 4 VDD transfer: The fourth phase connects the negative terminal of C2 to ground and the positive 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. The Sipex charge pump generates V+ and V- independently from VCC. 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 powerefficient innovation can greatly reduce total power consumption. This improvement is made possible by the independent phase sequence of the Sipex charge pump design. The clock rate for the charge pump typically operates at greater than 70kHz allowing the pump to run efficiently with small 0.1F 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 surface mount ceramic capacitors (such as
(R)
SP3224E-SP3227E Transceivers with Auto On-line
12
Plus
(c) 2006 Sipex Corporation
THEORY OF OPERATION 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 properly with a wide range of capacitor styles and values. 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 operating at higher VCC or to provide greater stability as the capacitors age. The SP3224E-SP3227E devices have the advanced Auto On-Line(R) Plus feature RS-232 signals use both positive and negative voltages of greater than 5V magnitude. Receivers 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.
+ V CC -
Phase 2 - Vss transfer from C2 to C4. Meanwhile C1 is charged to Vcc
+
+ V CC -
C
+
1
C
+
2
V+
e-
C
+
3
Phases 1 and 3: Store/Double. Double charge from C1 onto C2. C2 is now charged to -2xVcc
e-
e-
C
Vss
4
+
C
+
1
C
+
2
V+ V-
C
+
3
Patented 5,306,954 (Sipex, inc.)
+ V CC -
ee-
C
4
Phase 4 VDD transfer from C2 to C3. Meanwhile C1 is charged to Vcc
V
e+
DD
e+
+
C
+
1
C
+
2
V+ V-
C
+
3
e-
C
4
Charge Pump Phases
Minimum Recommended Charge Pump Capacitor Values Input Voltage VCC 3.0V to 3.6V 4.5V to 5.5V 3.0V to 5.5V Charge Pump Capacitor Value for SP32XX C1-C4=0.1F C1=0.047F, C2-C4=0.33F C1-C4=0.22F
Charge Pump Capacitor Values
Rev P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line
(R)
13
Plus
(c) 2006 Sipex Corporation
that saves power by turning off the charge pumps and driver outputs when the transceiver inputs are idle for more than 30 seconds. Auto On-line(R) Plus is equivalent to Maxim's "Auto Shutdown Plus" feature. It differs from our existing Auto On-line(R) by relying on signal transitions rather than voltage levels to trigger shutdown and wakeup. Auto On-Line(R) Plus automatically puts the device into a standby mode where it draws only 1A typical. When the device detects activity on either the receiver or driver inputs it will automatically awake and activate to allow serial communication. Both the wakeup life significantly. and shutdown happen automatiReceiver
THEORY OF OPERATION logic LOW forces the device into shutdown state regardless of input activity or the status of the ONLINE pin. The STATUS output determines whether a valid RS-232 signal voltage is present on the inputs. The STATUS pin goes to a logic LOW when the receiver input signal levels collapse near reference ground. This may occur when the RS-232 cable is disconnected or the RS-232 drivers of the connected peripheral are turned off. STATUS may be used to indicate DTR or a Ring Indicator signal or to determine whether a live RS232 driver or cable is connected. By connecting the STATUS output to ONLINE input, the SP3224E-SP3227E will shut down when no valid signal level and no input transitions are detected, and wake up on a valid signal level or signal edge. If it detects no signal transitions with the past 30
T_IN
EDGE DETECT
5k
+0.3V R_IN -0.3V
SHUTDOWN S 30s timer A
AUTO ONLINE
30s timer
STATUS
R_IN
EDGE DETECT
INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30S
ONLINE Figure 3c. Auto On-line(R) Plus Logic
Figure 3a.STATUS Functional Diagram STATUS low +2.7V R_IN -2.7V
SHUTDOWN ONLINE 30s timer STATUS
AUTO ONLINE
POWERDOWN
INVALID DEASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +2.7V AND -2.7V FOR AT LEAST 30S
POWERDOWN IS ONLY A INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL STATUS TO THE TRANSMITTERS AND THE POWER SUPPLIES.
Figure 3b. STATUS Functional Diagram, STATUS high. Figure 3d. Powerdown Logic
cally, without any user intervention, special drivers, or software modifications. Wakeup and shutdown can be externally controlled by the ONLINE and SHUTDOWN pins. When ONLINE is driven to logic LOW, the Auto On-line(R) Plus function is active. Driving SHUTDOWN to
Rev P 11/20/06
seconds, the device will go into low power mode. By connecting the STATUS output to both the ONLINE input and SHUTDOWN input pins, the device enters into shutdown when not receiving a valid RS-232 signal voltage input. When the SP3224E-SP3227E devices are
(R)
SP3224E-SP3227E Transceivers with Auto On-line
14
Plus
(c) 2006 Sipex Corporation
shut down, the charge pumps are turned off. V+ charge pump output decays to VCC,the V- output decays to GND. The decay time will depend on the size of capacitors used for the charge pump. Once in shutdown, the time required to exit the shutdown state and have valid V+ and V- levels is typically 50s. When the SP3224E-SP3227E drivers and internal charge pump are disabled, the supply current is reduced to 1A.
THEORY OF OPERATION
Auto On-Line (existing)
Device enters low-power mode if receiver inputs see less than valid +/- 3V.
STATUS (or INVALID) signal output indicates if valid signal voltage is at
receivers. Auto On-Line Plus (new) Device enters low-power mode if driver inputs or receiver inputs see no transitions for 30 seconds. Return to full power mode upon any transition on any driver input or receiver input Shutdown occurs even if data cable is connected to an active driver, as long as all inputs remain unchanged
STATUS (or INVALID) signal functions as before. Indicates if valid signal
voltage is present. But has no effect on shutdown For SP3224E the EN input is replaced with a READY output. READY drives high when charge pump achieves greater than -4V Vss (V-). Indicates "ready to transmit."
Comparison of Auto On-line(R) Features
Operating Mode
ONLINE
SHDN
|RIN| > 2.7V X X X X Yes No No Yes No
Idle Inputs (RxIN & TxIN) X X Active Idle > 30s X Active Idle > 30s X X
TxOUT
RxOUT
Forced Shutdown Forced On-Line Auto On-Line Plus (Wake when active) Auto On Line Plus (Off-Line when idle) Auto On-Line Plus (Wake on cable) Auto On-Line Plus (Wake when active) Auto On-Line Plus (Off-Line when idle) Auto On-Line (Wake on cable) Auto On-Line (Auto Shutoff)
X 1 0 0 STATUS STATUS STATUS STATUS STATUS
0 1 1 1 1 1 1 STATUS STATUS
Hi-Z Active Active Hi-Z Active Active Hi-Z Active Hi-Z
Active Active Active Active Active Active Active Active Active
Auto On-line(R) Plus Truth Table
Rev P 11/20/06
SP3224E-SP3227E Transceivers with Auto On-line
(R)
15
Plus
(c) 2006 Sipex Corporation
THEORY OF OPERATION
RECEIVER INPUTS INVALID } REGION
TRANSMITTER INPUTS
TRANSMITTER OUTPUTS STATUS Vcc t TSTL OUTPUT 0 Vcc OUTPUT 0 V+ Vcc 0 V-
t STH
t OFFLINE tONLINE
t OFFLINE
tONLINE
Auto On-Line(R) Plus Timing Diagram tSTL (=30s typ.) tSTH (=0.4s typ.) tOFFLINE (=30s typ.) tONLINE (=100s typ.)
Rev P 11/20/06
SP3224E-SP3227E Transceivers with Auto On-line
(R)
16
Plus
(c) 2006 Sipex Corporation
TYPICAL OPERATING CIRCUIT
+3.3V C5
C1 0.1uF
0.1uF 2 C1+
4 C15 C2+ 6 C2-
19 Vcc V+ 3 C3 0.1uF 7 C4 0.1uF
C2 0.1uF
SP3224E SP3225E
V-
13 T1IN TTL/CMOS INPUTS
T1OUT 17 RS-232 OUTPUTS
12 T2IN
T2OUT 8
15 R1OUT TTL/CMOS OUTPUTS
R1IN 16 5k RS-232 INPUTS
10 R2OUT
R2IN 9 5k
1
READY
STATUS
11
14 ONLINE
GND 18
SHUTDOWN
20
VCC
+3.3V C5 C1 0.1uF 0.1uF 2 C1+ 4 5 C2 0.1uF 6
C1C2+ C2T1OUT 13
RS-232 OUTPUT + INPUT
15 Vcc V+ 3 C3 0.1uF 7 C4 0.1uF
SP3226E SP3227E
V-
11 T1IN
TTL/CMOS INPUT/OUTPUT
9 R1OUT
R1IN 8 5k
1 READY 12 ONLINE
10
STATUS
16 VCC
GND SHUTDOWN 14
Rev P 11/20/06
SP3224E-SP3227E Transceivers with Auto On-line
(R)
17
Plus
(c) 2006 Sipex Corporation
PINOUT DIAGRAMS
READY 1 C1+ 2 V+ 3
C1- 4 C2+ 5
Solved by
20 SHUTDOWN 19 VCC 18 GND
TM
17 T1OUT
16 R1IN C2- 6 SP3224E 15 R1OUT SP3225E 14 ONLINE V- 7 13 T1IN T2OUT 8 12 T2IN R2IN 9 11 STATUS R2OUT 10
READY 1 C1+ 2 V+ 3 C1- 4 C2+ 5 C2VR1IN 6 7 8
Solved by
16 SHUTDOWN 15 VCC
TM
14 GND 13 T1OUT 12 ONLINE 11 T1IN
SP3226E SP3227E
10 STATUS 9 R1OUT
Rev P 11/20/06
SP3224E-SP3227E Transceivers with Auto On-line
(R)
18
Plus
(c) 2006 Sipex Corporation
Rev P 11/20/06
SP3224E-SP3227E Transceivers with Auto On-line
(R)
19
Plus
(c) 2006 Sipex Corporation
Rev P 11/20/06
SP3224E-SP3227E Transceivers with Auto On-line
(R)
20
Plus
(c) 2006 Sipex Corporation
Rev P 11/20/06
SP3224E-SP3227E Transceivers with Auto On-line
(R)
21
Plus
(c) 2006 Sipex Corporation
Rev P 11/20/06
SP3224E-SP3227E Transceivers with Auto On-line
(R)
22
Plus
(c) 2006 Sipex Corporation
ORDERING INFORMATION
Part number SP3224ECA-L SP3224ECY-L SP3224EEA-L SP3224EEY-L SP3225ECA-L SP3225ECY-L SP3225EEA-L SP3225EEY-L SP3226ECA-L SP3226ECY-L SP3226EEA-L SP3226EEY-L SP3227ECA-L SP3227ECY-L SP3227EEA-L SP3227EEY-L Temperature range From 0C to +70C From 0C to +70C From -40C to +85C From -40C to +85C From 0C to +70C From 0C to +70C From -40C to +85C From -40C to +85C From 0C to +70C From 0C to +70C From -40C to +85C From -40C to +85C From 0C to +70C From 0C to +70C From -40C to +85C From -40C to +85C Package Type Lead Free 20 pin SSOP Lead Free 20 pin TSSOP Lead Free 20 pin SSOP Lead Free 20 pin TSSOP Lead Free 20 pin SSOP Lead Free 20 pin TSSOP Lead Free 20 pin SSOP Lead Free 20 pin TSSOP Lead Free 16 pin SSOP Lead Free 16 PIN SSOP Lead Free 16 pin SSOP Lead Free 16 PIN TSSOP Lead Free 16 PIN SSOP Lead Free 16 PIN TSSOP Lead Free 16 PIN SSOP Lead Free 16 PIN TSSOP
Available in Tape on Reel
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 application 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 P 11/20/06 SP3224E-SP3227E Transceivers with Auto On-line
(R)
23
Plus
(c) 2006 Sipex Corporation

▲Up To Search▲

Price & Availability of SP3227EEY-L

	To Download SP3227EEY-L Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .