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SP231A/232A/233A/310A/312A
Enhanced RS-232 Line Drivers/Receivers
s Operates from Single 5V Power Supply s Meets All RS-232D and V.28 Specifications s Multiple Drivers and Receivers s Small Charge Pump Capacitors - 0.1F s Operates with 0.1F and 100F Capacitors s High Data Rate - 120kbps Under Load s High Output Slew Rate - 10V/s Under Load s Low Power Shutdown 1A s 3-State TTL/CMOS Receiver Outputs s 30V Receiver Input Levels s Low Power CMOS - 15mA Operation DESCRIPTION... The Sipex SP231A, SP232A and SP233A are enhanced versions of the Sipex SP231, SP232 and SP233 RS-232 line drivers/receivers. They are pin-for-pin replacements for these earlier versions and will operate in their sockets. Performance enhancements include 10V/s slew rate, 120k bits per second guaranteed transmission rate, and increased drive current for longer and more flexible cable configurations. Ease of use enhancements include smaller, 0.1F charge pump capacitors, enhanced ESD protection, low power dissipation and overall ruggedized construction for commercial environments. The series is available in plastic and ceramic DIP and SOIC packages operating over the commercial, industrial and military temperature ranges.
RS-232 OUTPUTS RS-232 INPUTS
CHARGE PUMP
T1
T2
R 1 R 2
TTL/CMOS INPUTS TTL/CMOS OUTPUTS
SP231ADS/01
SP231A Enhanced RS-232 Line Drivers/Receivers
(c) Copyright 2000 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Vcc ................................................................................................................................................................. +6V V+ .................................................................................................................... (Vcc-0.3V) to +13.2V V- .............................................................................................................................................................. 13.2V Input Voltages TIN ......................................................................................................................... -0.3 to (Vcc +0.3V) RIN ............................................................................................................................................................ 30V
Output Voltages TOUT .................................................................................................... (V+, +0.3V) to (V-, -0.3V) ROUT ................................................................................................................ -0.3V to (Vcc +0.3V) Short Circuit Duration TOUT ......................................................................................................................................... Continuous Power Dissipation CERDIP .............................................................................. 675mW (derate 9.5mW/C above +70C) Plastic DIP .......................................................................... 375mW (derate 7mW/C above +70C) Small Outline ...................................................................... 375mW (derate 7mW/C above +70C)
SPECIFICATIONS
VCC=+5V10%; V+=+8.5V to +13.2V (SP231A only) 0.1F charge pump capacitors; TMIN to TMAX unless otherwise noted.
PARAMETERS MIN. TTL INPUT Logic Threshold LOW HIGH 2.0 Logic Pullup Current Maximum Data Rate 120 TTL OUTPUT TTL/CMOS Output Voltage, Low Voltage, High 3.5 Leakage Current **; TA = +25 RS-232 OUTPUT Output Voltage Swing 5 Output Resistance Output Short Circuit Current RS-232 INPUT Voltage Range Voltage Threshold LOW HIGH Hysteresis Resistance 300
TYP.
MAX.
UNITS
CONDITIONS
0.8 15 200
Volts Volts A kbps
TIN ; EN, SD TIN ; EN, SD TIN = 0V CL = 2500pF, RL= 3k
0.4 0.05 9 18 +30 1.2 1.7 0.5 5 2.4 1.0 7 10
Volts Volts A Volts Ohms mA Volts Volts Volts Volts k
IOUT = 3.2mA; Vcc = +5V IOUT = -1.0mA EN = VCC, 0VVOUT VCC All transmitter outputs loaded with 3k to Ground VCC = 0V; VOUT = 2V Infinite duration
-30 0.8 0.2 3
VCC = 5V, TA = +25C VCC = 5V, TA = +25C VCC = 5V, TA = +25C TA = +25C, -15V VIN +15V
DYNAMIC CHARACTERISTICS Propagation Delay, RS232 to TTL Instantaneous Slew Rate Transition Region Slew Rate Output Enable Time ** Output Disable Time ** POWER REQUIREMENTS VCC Power Supply Current V+ Power Supply Current *** Shutdown Supply Current **
1.5 30 10 400 250 10 25 9 1 15 15 10
s V/s V/s ns ns mA mA mA A
CL = 10pF, RL= 3-7k; TA =+25C CL = 2500pF, RL= 3k; measured from +3V to -3V or -3V to +3V SP310A and SP312A only SP310A and SP312A only No load, TA= +25C; VCC = 5V All transmitters RL = 3k; TA = +25C No load, V+ = 12V,TA=+25C VCC = 5V, TA = +25C
**SP310A and SP312A only; *** SP231A only
SP231ADS/01
SP231A Enhanced RS-232 Line Drivers/Receivers
(c) Copyright 2000 Sipex Corporation
2
PERFORMANCE CURVES
-11 -10 10 12
30
8.2
8.4
25
VCC = 6V VCC = 5V
-9 -8 VCC = 4V 6 -7 VCC = 5V VCC = 6V 8
20
7.8 7.6 7.4 7.2 7.0
VCC = 6V
8.0
15 VCC = 5V 10 VCC = 4V 5 VCC = 3V
V+ (Volts)
ICC (mA)
-6 4 -5 -4 -3 0 2 4 6 8 10 12 14 0 0 5 10 15 20 25 30 35 40 2 VCC = 4V
V- Voltage (Volts)
VOH (Volts)
Load current = 0mA TA = 25C
0 -55 -40 Temperature (C) 0 25 70 85 125
6.8 4.5
4.75
5.0 VCC (Volts)
5.25
5.5
Load Current (mA)
Load Current (mA)
PINOUT...
C+
1
V+ VCC GND T1 OUT R1 IN R1 OUT T1 IN
14 13 12 11 10 9 8 14-Pin Plastic DIP T1 IN R1 OUT R1 IN T1 OUT GND T 2IN
C+ CVT2 OUT R2 IN R2 OUT T2 IN
1 2 3 4 5 6 7
16 15 14 13 12 11 10
V+ VCC GND T1 OUT R1 IN R1 OUT T1 IN
C-
2 3 4 5 6 7
VT2 OUT R2 IN R2 OUT T2 IN
SP231A
SP231A
1 2 3 4 5 6
VCC
VCC GND
20 19 18 17 16 15
R2 OUT R2 IN T2 OUT VC2 C 2+
NC
8
16-Pin SOIC
9
NC
T 2IN T1 IN
1 2
20 19
R2 OUT R2 IN
SP233ACP
C1 + V+
1 2 3 4 5 6 7 8 15 14 13 12 11 10 9
16
7
C1 +
T1 OUT R1 IN R 1OUT T 1IN T2 IN R 2OUT
14 8
GND C2 -
V+
R1 OUT
3
18
T2 OUT
13 9 10 12 11
20-PIN PLASTIC DIP
C1 VC2 +
R1 IN T1 OUT GND VCC V+ GND V-
4 5 6 7 8 9 10
17 16 15 14 13 12 11 20-PIN SOIC
VC2 C 2+ C1 - C1 + C2 + C2 -
C1 C2 + C2 VT 2OUT R2 IN
SP233ACT
NC C1 + V+ C1 C2 + C2 VT2 OUT R2 IN
SP232A
1 2 3 4 5 6 7 8 9
18 17 16 15 14 13 12 11 10
ON/OFF VCC GND T1 OUT R1 IN R1 OUT T1 IN T2 IN R2 OUT
EN C1 + V+ C1 C2 + C2 VT2 OUT R2 IN
1 2 3 4 5 6 7 8 9
18 17 16 15 14 13 12 11 10
SHUTDOWN VCC GND T1 OUT R1 IN R1 OUT T1 IN T2 IN R2 OUT
SP312A
SP310A
SP231ADS/01
SP231A Enhanced RS-232 Line Drivers/Receivers
(c) Copyright 2000 Sipex Corporation
3
FEATURES... The Sipex SP231A, SP232A and SP233A are enhanced versions of the Sipex SP231, SP232 and SP233 RS-232 line drivers/receivers. They arepinfor-pin replacements for these earlier versions, will operate in their sockets with capacitors ranging from 0.1 to 100F, either polarized or non-polarized, and feature several improvements in both performance and ease of use. Performance enhancements include 10V/s slew rate, 120k bits per second guaranteed transmission rate, and increased drive current for longer and more flexible cable configurations. Ease of use enhancements include smaller, 0.1F charge pump capacitors, enhanced ESD protection, low power dissipation and overall ruggedized construction for commercial environments. The SP232A, SP233A, SP310A and SP312A include charge pump voltage converters which allow them to operate from a single +5V supply. These converters convert the +5V input power to the 10V needed to generate the RS-232 output levels. Both meet all EIA RS-232D and CCITT V.28 specifications. The SP231A has provisions for external V+ supplies. With this power supplied externally, the current drain due to charge pump operation is considerably reduced, typically to 400A. The SP310A provides identical features as the SP232A. The SP310A has a single control line which simultaneously shuts down the internal DC/ DC converter and puts all transmitter and receiver outputs into a high impedance state. The SP312A is identical to the SP310A with separate tri-state and shutdown control lines. The SP231A is available in 14-pin plastic DIP, CERDIP and 16-pin SOIC packages for operation over commercial, industrial and military temperature ranges. The SP232A is available in 16-pin plastic DIP, SOIC and CERDIP
packages, operating over the commercial, industrial and military temperature ranges. The SP233A is available in a 20-pin plastic DIP and 20-pin SOIC package for operation over the commercial and industrial temperature ranges. The SP310A and SP312A are available in 18-pin plastic, CERDIP and SOIC packages for operation over the commercial and industrial temperature ranges. Please consult the factory for DIP and surface-mount packaged parts supplied on tape-on-reel, as well as parts screened to MIL-M-38510.
THEORY OF OPERATION The SP231A, SP232A, SP233A, SP310A and SP312A devices are made up of three basic circuit blocks - 1) a driver/transmitter, 2) a receiver and 3) a charge pump. Each block is described below. Driver/Transmitter The drivers are inverting transmitters, which accept TTL or CMOS inputs and output the RS-232 signals with an inverted sense relative to the input logic levels. Typically the RS-232 output voltage swing is 9V. Even under worst case loading conditions of 3kOhms and 2500pF, the output is guaranteed to be 5V, which is consistent with the RS-232 standard specifications. The transmitter outputs are protected against infinite short-circuits to ground without degradation in reliability. The instantaneous slew rate of the transmitter output is internally limited to a maximum of 30V/ s in order to meet the standards [EIA RS-232-D 2.1.7, Paragraph (5)]. However, the transition region slew rate of these enhanced products is typically 10V/s. The smooth transition of the loaded output from VOL to VOH clearly meets the monotonicity requirements of the standard [EIA RS-232-D 2.1.7, Paragraphs (1) & (2)].
S1 V CC + S2 GND C1
S3 V+ = 2VCC + S4 C3 V
CC
S1 V+
S3 GND + C2 + S4 C4 V- = -(V+)
FROM VOLTAGE DOUBLER
GND
S2
INTERNAL OSCILLATOR
INTERNAL OSCILLATOR
Figure 1. Charge Pump Voltage Doubler
SP231ADS/01
Figure 2. Charge Pump Voltage Inverter
SP231A Enhanced RS-232 Line Drivers/Receivers (c) Copyright 2000 Sipex Corporation
4
Receivers The receivers convert RS-232 input signals to inverted TTL signals. Since the 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. The input thresholds are 0.8V minimum and 2.4V maximum, again well within the 3V RS-232 requirements. The receiver inputs are also protected against voltages up to 30V. Should an input be left unconnected, a 5kOhm pulldown resistor to ground will commit the output of the receiver to a high state. In actual system applications, it is quite possible for signals to be applied to the receiver inputs before power is applied to the receiver circuitry. This occurs, for example, when a PC user attempts to print, only to realize the printer wasn't turned on. In this case an RS-232 signal from the PC will appear on the receiver input at the printer. When the printer power is turned on, the receiver will operate normally. All of these enhanced devices are fully protected. Charge Pump The charge pump section of the these devices allows the circuit to operate from a single +5V 10% power supply by generating the required operating voltages internal to the devices. The charge pump consists of two sections -- 1) a voltage doubler and 2) a voltage inverter.
As shown in Figure 1, an internal oscillator triggers the charge accumulation and voltage inversion. The voltage doubler momentarily stores a charge on capacitor C1 equal to Vcc, referenced to ground. During the next transition of the oscillator this charge is boot-strapped to transfer charge to capacitor C3. The voltage across C3 is now from Vcc to V+. In the inverter section (Figure 2), the voltage across C3 is transferred to C2 forcing a range of 0V to V+ across C2. Boot-strapping of C2 will then transfer charge to C4 to genrate V-. One of the significant enhancements over previous products of this type is that the values of the capacitors are no longer critical and have been decreased in size considerably to 0.1F. Because the charge pump runs at a much higher frequency, the 0.1F capacitors are sufficient to transfer and sustain charges to the two transmitters. APPLICATION HINTS Protection From Shorts to 15V The driver outputs are protected against shorts to ground, other driver outputs, and V+ or V-. If the possibility exists that the outputs could be inadvertently connected to voltages higher than 15V, then it is recommended that external protection be provided. For protection against voltages exceeding 15V, two back-to-back zener diodes connected from each output to ground will clamp the outputs to an acceptable voltage level.
+5V INPUT
+5V INPUT
V+ (+8.5V to +13.2V)
10 F 6.3V
+
1
16 C+
1
1 0.1 F + 6.3V 2 C 1+ C 1-
13 V
CC
+12V to -12V Voltage Inverter
V+
14 0.1 F 16V 3 +
TTL/CMOS OUTPUTS TTL/CMOS INPUTS
0.1 F + 6.3V 3 4 0.1 F + 16V 5
V
CC
C 1C 2+ C 2-
+5V to +10V Voltage Doubler +10V to -10V Voltage Inverter 400k
V+
0.1 F 6.3V 2+
*
V-
6
+ 0.1 F
16V
V400k T1 IN 8
TTL/CMOS OUTPUTS TTL/CMOS INPUTS
T1
400k
11
RS-232 OUTPUTS
T1 IN
11 400k
T1 T2
R 1
5k
14
T 1OUT
T 1OUT
T2 IN
10
7
T 2OUT
T2 IN
7
R 1 OUT
12
13
R 1 IN
R 1 OUT
9
R 1
5k
10
R 1 IN
RS-232 INPUTS
R 2 OUT
9 SP232A
R 2
5k GND 15
8
R 2 IN
R 2 OUT
6 SP231A
R 2
5k GND 12
5
R 2 IN
*The negative terminal of the V+ storage capacitor can be tied to either VCC or GND. Connecting the capacitor to VCC (+5V) is recommended.
Figure 3. Typical Circuits using the SP231A and 232A.
SP231ADS/01 SP231A Enhanced RS-232 Line Drivers/Receivers (c) Copyright 2000 Sipex Corporation
5
RS-232 INPUTS
T2
4
T 2OUT
RS-232 OUTPUTS
+5V INPUT
+5V INPUT
7
7
TTL/CMOS OUTPUTS TTL/CMOS INPUTS
TTL/CMOS OUTPUTS TTL/CMOS INPUTS
V CC
V CC
T1 IN 2
RS-232 OUTPUTS
T1 IN
2
400k
T1 T2
5
T 1OUT
400k
T1 T2
5
T 1OUT
T2 IN
1
400k
18
T 2OUT
T2 IN
1
400k
18
T 2OUT
RS-232 INPUTS
R 1 OUT
3
R1
5k
4
RS-232 INPUTS
R 1 IN
R 1 OUT
3
R1
5k
4
R 1 IN
R 2 OUT
20 8 13 12 17 14 C 1+ C 1VVV+
R2
5k
19
R 2 IN
R 2 OUT
20 13 C + 1 14 10 17 C 1VVV+
R2
5k
19
R 2 IN
Do not make connection to these pins Internal -10V Power Supply Internal +10V Power Supply
C + 11
2
Do not make connection to these pins Internal -10V Power Supply Internal +10V Power Supply
C 2 + 12 C 2 + 15 C2 SP233ACT GND GND C2 11
C 2 + 15 C2 SP233A GND GND 6 9 C2 10 16
8
16
6
9
Figure 4. Typical Circuits using the SP233ACP and SP233ACT
Shutdown (SD) and Enable (EN) SP310A/SP312A Only Both the SP310A and SP312A have a shut-down/ standby mode to conserve power in battery-powered systems. To activate the shutdown mode, which stops the operation of the charge pump, a logic "0" is applied to the appropriate control line. For the SP310A, this control line is ON/OFF (pin 18). Activating the shutdown mode also puts the SP310A transmitter and receiver outputs in a high impedance condition (tri-stated). The shutdown mode is controlled on the SP312A by a logic "0" on the SHUTDOWN control line (pin 18); this also puts the transmitter outputs in a tri-state mode. The receiver outputs can be tri-stated separately during normal operation or shutdown by a logic "1" on the ENABLE line (pin 1). Wake-Up Feature (SP312A Only) The SP312A has a wake-up feature that keeps all the receivers in an enabled state when the device is in the shutdown mode. Table 1 defines the truth table for the wake-up function. With only the receivers activated, the SP312A typically draws less than 5A supply current (10A maximum). In the case of a modem interfaced to a computer in power down mode, the Ring Indicator (RI) signal from the modem would be used to "wake up" the computer, allowing it to accept data transmission.
After the ring indicator signal has propagated through the SP312A receiver, it can be used to trigger the power management circuitry of the computer to power up the microprocessor, and bring the SD pin of the SP312A to a logic high, taking it out of the shutdown mode. The receiver propagation delay is typically 1s. The enable time for V+ and V- is typically 2ms. After V+ and V- have settled to their final values, a signal can be sent back to the modem on the data terminal ready (DTR) pin signifying that the computer is ready to accept and transmit data. Pin Strapping -- SP233ACT Only The SP233A packaged in the 20-pin SOIC package (SP233ACT) has a slightly different pinout than the SP233A in other package configurations. To operate properly, the following pairs of pins must be externally wired together: the two V- pins (pins 10 and 17) the two C2+ pins (pins 12 and 15) the two C2- pins (pins 11 and 16) All other connections, features, functions and performance are identical to the SP233A as specified elsewhere in this data sheet.
Power Up/Down Down Down Up Up Receiver Outputs Enable Tri-state Enable Tri-state
SD 0 0 1 1
EN 0 1 0 1
Table 1. Wake-up Function Truth Table.
SP231ADS/01 SP231A Enhanced RS-232 Line Drivers/Receivers (c) Copyright 2000 Sipex Corporation
6
RS-232 OUTPUTS
+5V INPUT 10 F 6.3V
+5V INPUT 10 F 6.3V
+
+
2 0.1 F + 6.3V 4 5 C+
1
17 V
CC
C 1C 2+ C 2-
+5V to +10V Voltage Doubler +10V to -10V Voltage Inverter 400k
0.1 F 16V 3+ V+
2
17 C+
1
*
0.1 F 16V
TTL/CMOS INPUTS
0.1 F + 6.3V 4 5
V
CC
C 1C 2+ C 2-
+5V to +10V Voltage Doubler +10V to -10V Voltage Inverter 400k
V+
0.1 F 16V 3+
*
16V
0.1 F + 16V 6
TTL/CMOS OUTPUTS TTL/CMOS INPUTS
V-
7
+
0.1 F + 16V 6
V-
7
+ 0.1 F
RS-232 OUTPUTS
T1 IN
12
T1
400k
15
T 1OUT
T1 IN
12
T1
400k
15
T 1OUT
T2 IN
11
T2 R 1
5k
8
T2 IN
11
T 2OUT RS-232 INPUTS
T2
8
T 2OUT
R 1 OUT
13
R 1
5k
R 1 IN
R 2 OUT
10
R 2
5k
9
R 2 IN
R 2 OUT
10
R 2
5k
9
R 2 IN
SP310A
GND 16
18
ON/OFF
EN
1
SP312A
GND 16
18
SHUTDOWN
*The negative terminal of the V+ storage capacitor can be tied to either VCC or GND. Connecting the capacitor to VCC (+5V) is recommended.
*The negative terminal of the V+ storage capacitor can be tied to either VCC or GND. Connecting the capacitor to VCC (+5V) is recommended.
Figure 5. Typical Circuits using the SP310A and SP312A
SP231ADS/01
SP231A Enhanced RS-232 Line Drivers/Receivers
(c) Copyright 2000 Sipex Corporation
7
RS-232 INPUTS
R 1 OUT
13
14
R 1 IN
TTL/CMOS OUTPUTS
14
RS-232 OUTPUTS
ORDERING INFORMATION
Model ....................................................................................... Temperature Range ................................................................................ Package SP231ACP ..................................................................................... 0C to +70C ....................................................................... 14-pin Plastic DIP SP231ACT ..................................................................................... 0C to +70C ................................................................................ 16-pin SOIC SP231ACX ..................................................................................... 0C to +70C .............................................................................................. Dice SP231AEP ................................................................................... -40C to +85C ..................................................................... 14-pin Plastic DIP SP231AET ................................................................................... -40C to +85C .............................................................................. 16-pin SOIC SP232ACN ..................................................................................... 0C to +70C ........................................................................... 16-pin N-SOIC SP232ACP ..................................................................................... 0C to +70C ....................................................................... 16-pin Plastic DIP SP232ACT ..................................................................................... 0C to +70C ................................................................................ 16-pin SOIC SP232ACX ..................................................................................... 0C to +70C .............................................................................................. Dice SP232AEN ................................................................................... -40C to +85C .......................................................................... 16-pin N-SOIC SP232AEP ................................................................................... -40C to +85C ..................................................................... 16-pin Plastic DIP SP232AET ................................................................................... -40C to +85C .............................................................................. 16-pin SOIC SP233ACP ..................................................................................... 0C to +70C ....................................................................... 20-pin Plastic DIP SP233ACT ..................................................................................... 0C to +70C ................................................................................ 20-pin SOIC SP233AEP ................................................................................... -40C to +85C ..................................................................... 20-pin Plastic DIP SP233AET ................................................................................... -40C to +85C .............................................................................. 20-pin SOIC SP310ACP ..................................................................................... 0C to +70C ....................................................................... 18-pin Plastic DIP SP310ACT ..................................................................................... 0C to +70C ................................................................................ 18-pin SOIC SP310ACX ..................................................................................... 0C to +70C .............................................................................................. Dice SP310AEP ................................................................................... -40C to +85C ..................................................................... 18-pin Plastic DIP SP310AET ................................................................................... -40C to +85C .............................................................................. 18-pin SOIC SP312ACP ..................................................................................... 0C to +70C ....................................................................... 18-pin Plastic DIP SP312ACT ..................................................................................... 0C to +70C ................................................................................ 18-pin SOIC SP312ACX ..................................................................................... 0C to +70C .............................................................................................. Dice SP312AEP ................................................................................... -40C to +85C ..................................................................... 18-pin Plastic DIP SP312AET ................................................................................... -40C to +85C .............................................................................. 18-pin SOIC Please consult the factory for pricing and availability on a Tape-On-Reel option.
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation Headquarters and Sales Office 22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com Sales Office 233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.
SP231ADS/01
SP231A Enhanced RS-232 Line Drivers/Receivers
(c) Copyright 2000 Sipex Corporation
8

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